阅读说明：本技术 循环泵驱动装置及洗涤物处理装置 (Circulating pump driving device and laundry treatment device ) 是由 金俊成 金志勋 李俊浩 于 2019-07-05 设计创作，主要内容包括：本发明提供一种循环泵驱动装置及洗涤物处理装置。本发明实施例的循环泵驱动装置及洗涤物处理装置包括：逆变器,利用其开关动作,将来自转换器的直流电源变换为交流电源,并将变换的交流电源输出给循环泵马达；控制部,将模式区分为循环泵马达的速度恒定的第一模式、循环泵马达的速度反复上升和下降的第二模式、循环泵马达的速度先以第一上升斜率和第二上升斜率上升后保持恒定的第三模式,并控制循环泵马达按照第一模式至第三模式中的至少两种模式进行动作。由此,能够提高洗涤时的基于循环抽吸的洗涤力。(The invention provides a circulating pump driving device and a washings processing device. The circulating pump driving device and the washings processing device of the embodiment of the invention comprise: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; the control unit divides the modes into a first mode in which the speed of the circulation pump motor is constant, a second mode in which the speed of the circulation pump motor repeatedly increases and decreases, and a third mode in which the speed of the circulation pump motor is first increased at a first increase slope and a second increase slope and then is kept constant, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode. This can improve the washing power by the circulation suction during washing.)

1. A driving device of a circulating pump is characterized in that,

the method comprises the following steps:

a circulation pump motor supplying a rotation force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit that divides a mode into a first mode in which a speed of the circulation pump motor is constant, a second mode in which the speed of the circulation pump motor repeatedly increases and decreases, and a third mode in which the speed of the circulation pump motor is constant after increasing at a first increase slope and a second increase slope, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode.

2. The circulating pump driving apparatus according to claim 1,

the control unit controls the speed increase slope and the speed decrease slope of the circulation pump motor to be the same in the second mode.

3. The circulating pump driving apparatus according to claim 1,

the control unit controls the speed rising slope of the circulation pump motor in the second mode to be the same as the speed rising slope in the third mode.

4. The circulating pump driving apparatus according to claim 1,

the control unit is configured to set the first rising gradient to be larger than the second rising gradient in the third mode.

5. The circulating pump driving apparatus according to claim 1,

the control unit controls the first mode to the third mode to be sequentially and repeatedly executed.

6. A driving device of a circulating pump is characterized in that,

the method comprises the following steps:

a circulation pump motor supplying a rotation force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit that divides a mode into a first mode in which power of the circulation pump motor is constant, a second mode in which power of the circulation pump motor is repeatedly increased and decreased, and a third mode in which power of the circulation pump motor is maintained constant after being increased at a first increase slope and a second increase slope, and controls the circulation pump motor to operate in at least two of the first mode to the third mode.

7. A laundry processing apparatus, characterized in that,

the method comprises the following steps:

a washing tank;

a tub motor supplying a rotational force to the tub;

a circulation pump for circularly pumping the washing water flowing from the washing tank;

a circulation pump motor supplying a rotational force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit that divides a mode into a first mode in which a speed of the circulation pump motor is constant, a second mode in which the speed of the circulation pump motor repeatedly increases and decreases, and a third mode in which the speed of the circulation pump motor is constant after increasing with a first increase slope and a second increase slope, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode.

8. The laundry treatment apparatus according to claim 7,

the control unit controls the speed increase slope and the speed decrease slope of the circulation pump motor to be the same in the second mode.

9. The laundry treatment apparatus according to claim 7,

the control unit controls the speed rising slope of the circulation pump motor in the second mode to be the same as the speed rising slope in the third mode.

10. The laundry treatment apparatus according to claim 7,

the control unit is configured to set the first rising gradient to be larger than the second rising gradient in the third mode.

11. A laundry processing apparatus, characterized in that,

the method comprises the following steps:

a washing tank;

a tub motor supplying a rotational force to the tub;

a circulation pump for circularly pumping the washing water flowing from the washing tank;

a circulation pump motor supplying a rotational force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit for controlling the circulation pump motor to keep the speed constant when the washing tank motor operates at a speed at which the laundry is stuck to the washing tank.

12. The laundry treatment apparatus according to claim 11,

when the washing tank motor operates at a speed at which the laundry moves in the lower part of the washing tank, the control unit controls the circulation pump motor to repeatedly increase and decrease the speed of the circulation pump motor.

13. The laundry treatment apparatus according to claim 11,

the control unit controls the circulation pump motor to maintain a constant speed after the circulation pump motor first rises at a first rising slope and a second rising slope when the washing tub motor operates at a speed at which laundry moves from a lower portion to an upper portion of the washing tub and drops from the upper portion.

14. A laundry processing apparatus, characterized in that,

the method comprises the following steps:

a washing tank;

a tub motor supplying a rotational force to the tub;

a circulation pump for circularly pumping the washing water flowing from the washing tank;

a circulation pump motor supplying a rotational force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit for controlling the circulation pump motor to repeatedly increase and decrease the speed of the washing tub motor when the washing tub motor operates at a speed at which the laundry moves in a lower part of the washing tub.

15. A laundry processing apparatus, characterized in that,

the method comprises the following steps:

a washing tank;

a tub motor supplying a rotational force to the tub;

a circulation pump for circularly pumping the washing water flowing from the washing tank;

a circulation pump motor supplying a rotational force to the circulation pump;

a converter outputting a direct current power supply;

an inverter that converts the dc power from the converter into an ac power by a switching operation thereof and outputs the converted ac power to the circulation pump motor; and

and a control unit for controlling the circulation pump motor to maintain a constant speed after the circulation pump motor is raised at a first rising slope and a second rising slope when the washing tub motor operates at a speed at which the laundry moves from the lower portion to the upper portion of the washing tub and drops from the upper portion.

Technical Field

The present invention relates to a circulation pump driving device and a laundry treatment device, and more particularly, to a circulation pump driving device and a laundry treatment device capable of improving a washing force by circulation suction during washing.

The present invention also relates to a circulation pump driving device and a laundry treatment apparatus capable of driving a circulation pump motor in a sensorless manner.

The present invention also relates to a circulation pump driving device and a laundry treatment apparatus capable of improving the stability of the inverter.

Background

In the circulation pump driving device, the circulation pump motor is driven to suck the water supplied from the water inlet portion and discharge the water into the washing tub.

In general, when an AC pump motor is used for driving the circulation pump, the motor is driven by a constant speed operation based on an input AC power supply.

For example, when the frequency of the input ac power is 50Hz, the circulation pump motor rotates at 3000rpm, and when the frequency of the input ac power is 60Hz, the circulation pump motor rotates at 3600 rpm.

If such an AC pump motor is used, the speed of the motor cannot be controlled during water discharge, and therefore, there is a disadvantage that the time required for water discharge during water discharge becomes long.

In order to eliminate such a disadvantage, a study is being conducted to use a dc brushless motor as a circulation pump motor.

Japanese laid-open patent publication nos. 2001-276485 and 2002-166090 exemplify drain pump motors based on dc brushless motors.

In such a conventional document, since the speed control is performed at the time of the drain pump motor control, there is a disadvantage that the time required for completion of the drain at the time of the drain becomes long.

Also, in such prior documents, what is disclosed is for the drain pump motor control and not for the circulation pump motor control, and there is only disclosed a case where the speed control is performed at the time of the drain pump motor control, and there is no disclosure regarding various actions of the circulation pump motor.

Disclosure of Invention

Problems to be solved

The invention aims to provide a circulating pump driving device and a washing processing device which can improve the washing force based on circulating suction during washing.

Another object of the present invention is to provide a circulation pump driving device and a laundry treatment apparatus capable of driving a circulation pump motor in a sensorless manner.

It is still another object of the present invention to provide a circulation pump driving device and a laundry treatment apparatus capable of improving the stability of a converter.

Technical scheme for solving problems

In order to achieve the above object, a circulation pump driving device and a laundry treatment device according to an embodiment of the present invention include: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; the control unit divides the modes into a first mode in which the speed of the circulation pump motor is constant, a second mode in which the speed of the circulation pump motor repeatedly increases and decreases, and a third mode in which the speed of the circulation pump motor is first increased at a first increase slope and a second increase slope and then is kept constant, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode.

In the washing machine according to the embodiment of the present invention, the control unit may control the speed increasing slope and the speed decreasing slope of the circulation pump motor to be the same in the second mode.

In the circulation pump driving device and the laundry treatment device according to the embodiment of the present invention, the control unit may control the speed rising slope of the circulation pump motor in the second mode to be the same as the speed rising slope in the third mode.

In addition, the control unit of the circulation pump driving device and the laundry treatment device according to the embodiment of the present invention may control the first rising slope to be larger than the second rising slope in the third mode.

In addition, the control unit of the circulation pump driving device and the laundry treating device according to the embodiment of the present invention may be controlled to sequentially and repeatedly execute the first mode to the third mode.

In order to achieve the above object, a circulation pump driving device and a laundry treating device according to another embodiment of the present invention include: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; the control unit divides the modes into a first mode in which the power of the circulation pump motor is constant, a second mode in which the power of the circulation pump motor repeatedly increases and decreases, and a third mode in which the power of the circulation pump motor is kept constant after increasing at a first increase slope and a second increase slope, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode.

In order to achieve the object, a laundry treatment apparatus according to still another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to keep the speed constant when the washing tank motor moves according to the speed of the washed object attached to the washing tank.

In order to achieve the object, a laundry treatment apparatus according to still another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to repeatedly rise and fall when the washing tank motor moves according to the speed of the washing articles moving at the lower part of the washing tank.

In order to achieve the object, a laundry treatment apparatus according to still another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to maintain the speed constant after the circulating pump motor is raised with the first and second raising slopes when the circulating pump motor operates according to the speed that the washings move from the lower part to the upper part of the washing tank and fall from the upper part.

Technical effects

The circulating pump driving device and the washings processing device of the embodiment of the invention comprise: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; the control unit divides the modes into a first mode in which the speed of the circulation pump motor is constant, a second mode in which the speed of the circulation pump motor repeatedly increases and decreases, and a third mode in which the speed of the circulation pump motor is first increased at a first increase slope and a second increase slope and then is kept constant, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode. This can improve the washing power by the circulation suction during washing.

In the washing machine according to the embodiment of the present invention, the control unit may control the speed increasing slope and the speed decreasing slope of the circulation pump motor to be the same in the second mode. This can improve the washing power by the circulation suction during washing.

In the circulation pump driving device and the laundry treatment device according to the embodiment of the present invention, the control unit may control the speed rising slope of the circulation pump motor in the second mode to be the same as the speed rising slope in the third mode. This can improve the washing power by the circulation suction during washing.

In addition, the control unit of the circulation pump driving device and the laundry treatment device according to the embodiment of the present invention may be configured such that the first rising gradient is larger than the second rising gradient in the third mode. This can improve the washing power by the circulation suction during washing.

In addition, the control unit of the circulation pump driving device and the laundry treating device according to the embodiment of the present invention may be controlled to sequentially and repeatedly execute the first mode to the third mode. This can improve the washing power by the circulation suction during washing.

In addition, the circulating pump driving device and the washing processing device of the embodiment of the invention comprise: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; the control unit divides the modes into a first mode in which the power of the circulation pump motor is constant, a second mode in which the power of the circulation pump motor repeatedly increases and decreases, and a third mode in which the power of the circulation pump motor is kept constant after increasing at a first increase slope and a second increase slope, and controls the circulation pump motor to operate in at least two modes from the first mode to the third mode. This can improve the washing power by the circulation suction during washing.

In addition, the laundry processing apparatus according to another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to keep the speed constant when the washing tank motor moves according to the speed of the washed object attached to the washing tank. This can improve the washing power by the circulation suction during washing.

In addition, the laundry processing apparatus according to another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to repeatedly rise and fall when the washing tank motor moves according to the speed of the washing articles moving at the lower part of the washing tank. This can improve the washing power by the circulation suction during washing. This can improve the washing power by the circulation suction during washing.

In addition, the laundry processing apparatus according to another embodiment of the present invention includes: an inverter for converting the DC power from the converter into AC power by switching operation thereof and outputting the converted AC power to the circulation pump motor; and a control part for controlling the circulating pump motor to maintain the speed constant after the circulating pump motor is raised with the first and second raising slopes when the washing tank motor operates according to the speed that the washings move from the lower part to the upper part of the washing tank and fall from the upper part. This can improve the washing power by the circulation suction during washing.

Drawings

Fig. 1 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.

Fig. 2 is a side sectional view of the laundry treating apparatus of fig. 1.

Fig. 3 is an internal block diagram of the laundry treating apparatus of fig. 1.

Fig. 4 illustrates an example of an internal block diagram of the circulation pump driving device of fig. 1.

Fig. 5 is an example of an internal circuit diagram of the circulation pump driving device of fig. 4.

Fig. 6 is an internal block diagram of the main control unit of fig. 5.

Fig. 7 is a diagram showing power supplied to the motor in correspondence with power control and speed control.

Fig. 8 and 9 are views showing the external appearance of the circulation pump driving apparatus according to the embodiment of the present invention.

Fig. 10 is a diagram for reference in explaining the operation of the circulation pump motor.

Fig. 11 is a flowchart illustrating an operation method of the laundry processing device according to the embodiment of the present invention.

Fig. 12 to 15c are diagrams for reference in explaining the operation method of fig. 11.

Detailed Description

The present invention will be described in more detail below with reference to the accompanying drawings.

The suffix "module" and "portion" used in the following description for a structural element are given only in consideration of the ease of writing the description, and do not particularly give an important meaning or effect to itself. Therefore, "module" and "section" may be mixed with each other.

Fig. 1 is a perspective view illustrating a laundry treating apparatus according to an embodiment of the present invention, and fig. 2 is a side sectional view of the laundry treating apparatus of fig. 1.

Referring to fig. 1 to 2, in the laundry treatment apparatus 100 according to the embodiment of the present invention, the laundry treatment apparatus 100 according to the embodiment of the present invention is a front load type laundry treatment apparatus in which laundry is put into a washing tub from a front side (front).

The following is explained with reference to the drawings: the laundry processing apparatus 100 is a drum type laundry processing apparatus, and includes: a housing 110 forming an external appearance of the laundry treating apparatus 100; a washing tub 120 disposed inside the casing 110 and supported by the casing 110; a drum 122 disposed inside the washing tub 120, which is a washing tub for washing laundry; a motor 130 for driving the drum 122; a washing water supply device (not shown) disposed outside the cabinet body 111 for supplying washing water into the casing 110; and a drain (not shown) formed below the washing tub 120 to drain the washing water to the outside.

A plurality of through holes 122A through which washing water passes are formed in the drum 122, and a lifter 124 may be disposed at an inner side of the drum 122 so that laundry is lifted a predetermined height and then dropped by gravity when the drum 122 rotates.

The housing 110 includes: a case body 111; a case cover 112 disposed on the front surface of the case body 111 and coupled to the case body 111; a control panel 115 disposed on the upper side of the case cover 112 and coupled to the case body 111; and a top plate 116 disposed above the control panel 115 and coupled to the casing body 111.

The case cover 112 includes: a laundry inlet/outlet hole 114 formed to allow laundry to enter and exit; and a door 113 which is disposed to be rotatable left and right and which can open and close the laundry inlet and outlet hole 114.

The control panel 115 includes: an operation key 117 for operating an operation state of the laundry processing apparatus 100; and a display 118 disposed at one side of the operation keys 117 for displaying an operation state of the laundry treating apparatus 100.

The operation keys 117 and the display 118 in the control panel 115 are electrically connected to a control unit (not shown), and the control unit (not shown) electrically controls the respective components of the laundry processing apparatus 100. The operation of the control unit (not shown) is described with reference to the operation of the control unit 210 in fig. 3, and the description thereof is omitted here.

In addition, an automatic balancer (not shown) may be provided at the drum 122. The automatic balancer (not shown) is for reducing vibration generated by an eccentric amount of laundry received in the drum 122, and may be implemented by a liquid balancer, a ball balancer, or the like.

The washing water in the washing tub 120 is discharged through the drain flow path 143, and a drain valve 139 for controlling the drain flow path 143 and a drain pump 141 for sucking the washing water may be provided.

A circulation pump 171 for pumping the washing water may be provided at an end of the drain flow path 143. The washing water pumped from the circulation pump 171 may be re-introduced into the washing tub 120 through the circulation flow path 144.

Fig. 3 is an internal block diagram of the laundry treating apparatus of fig. 1.

The following is explained with reference to the drawings: in the laundry processing apparatus 100, the driving unit 220 is controlled by the control operation of the main control unit 210, and the driving unit 220 drives the motor 230. Thereby, the washing tub 120 is rotated by the motor 230.

In addition, the laundry treating apparatus 100 may be provided with a motor 630 for driving the drain pump 141 and a drain pump driving device 620 for driving the motor 630. The drain pump driving device 620 may be controlled by the main control part 210.

In addition, the laundry treating apparatus 100 may be provided with a circulation pump motor 730 for driving the circulation pump 171 and a circulation pump driving device 720 for driving the circulation pump motor 730. The circulation pump driving device 720 may be controlled by the main control part 210.

In the present specification, the circulation pump driving device 720 may be referred to as a circulation pump driving unit.

The main control unit 210 operates in response to an operation signal input from the operation key 117. Thereby, the washing process, the rinsing process, and the dehydrating process can be performed.

The main control unit 210 may control the display 118 to display a washing course, a washing time, a dehydrating time, a rinsing time, etc., or to display a current operation state, etc.

The main control unit 210 controls the driving unit 220 to operate the motor 230. For example, the main control part 210 may control the driving part 220 to rotate the motor 230 based on the current detecting part 225 that detects the output current flowing in the motor 230 and the position sensing part 220 that senses the position of the motor 230. Although the figures show the case where the detected current and the sensed position signal are input to the driving unit 220, the present invention is not limited thereto, and the detected current and the sensed position signal may be input to the main control unit 210 or may be input to both the main control unit 210 and the driving unit 220.

The driving unit 220 drives the motor 230, and may include an inverter (not shown) and an inverter control unit (not shown). The driving unit 220 may be a concept including a converter or the like for supplying a dc power input to an inverter (not shown).

For example, when the inverter control unit (not shown) outputs a switching control signal of the pulse width modulation PWM method to the inverter (not shown), the inverter (not shown) can perform a high-speed switching operation to supply an ac power source of a predetermined frequency to the motor 230.

In addition, the main control part 210 may sense the laundry amount based on the current io detected in the current detection part 220 or the position signal H sensed in the position sensing part 235. For example, during the rotation of the wash tank 120, the laundry amount may be sensed based on the current value io of the motor 230.

In addition, the main control part 210 may sense an eccentric amount of the washing tub 120, that is, Unbalance (UB) of the washing tub 120. Such eccentricity amount sensing may be performed based on a ripple (ripple) component of the current io detected in the current detection part 225 or a variation amount of the rotation speed of the washing tub 120.

In addition, the water level sensor 121 may measure the water level inside the washing tub 120.

For example, the frequency of the water level of the empty water level having no water in the tub 120 may be 28KHz, and the frequency of the water level of the full water level having the water in the tub 120 up to the allowable water level may be 23 KHz.

That is, the frequency of the water level sensed in the water level sensor 121 may be inversely proportional to the water level in the washing tub.

In addition, the tub water level Shg output from the water level sensor 121 may be a water level frequency or a water level inversely proportional to the water level frequency.

In addition, the main control part 210 may determine whether the washing tub 120 is full, empty, or reset based on the washing tub water level Shg sensed by the water level sensor 121.

Fig. 4 is a diagram illustrating an example of an internal block diagram of the circulation pump driving device of fig. 1, and fig. 5 is a diagram illustrating an example of an internal circuit of the circulation pump driving device of fig. 4.

The following is explained with reference to the drawings: the circulation pump driving apparatus 720 according to an embodiment of the present invention is used to drive the circulation pump motor 730 in a sensorless (sensorless) manner, and may include an inverter 420, an inverter control part 430, a main control part 210, and the like.

The main control unit 210 and the inverter control unit 430 may correspond to the control unit and the second control unit described in this specification, respectively.

Also, the circulation pump driving device 720 of the embodiment of the present invention may include the converter 410, the dc terminal voltage detecting portion B, dc terminal capacitor C, the output current detecting portion E, and the like. The circulation pump driving device 72 may further include an input current detection unit a, a reactor L, and the like.

The operation of each component in circulation pump driving device 720 of fig. 4 and 5 will be described below.

Reactor L is disposed between commercial ac power supply 405(vs) and converter 410, and performs a power factor correction operation or a voltage boosting operation. Also, reactor L may also perform a function for limiting harmonic currents based on high-speed switching of converter 410.

The input current detection unit a can detect the input current is input from the commercial ac power supply 405. For this purpose, a Current Transformer (CT), a shunt resistor (shunt resistance), or the like can be used as the input current detection unit a. The detected input current is a pulse-shaped discrete signal (discrete signal), and may be input to the inverter control unit 430 or the main control unit 210. The figure illustrates a case where the input is input to the main control section 210.

Converter 410 converts commercial ac power supply 405 via reactor l (reactor) into dc power supply and outputs the dc power supply. The commercial ac power source 405 is shown as a single-phase ac power source in the drawing, but may be a three-phase ac power source. The internal configuration of converter 410 will also vary depending on the type of commercial ac power source 405.

The converter 410 may be formed of a diode or the like without a switching element, and may perform a rectifying operation without performing an additional switching operation.

For example, four diodes may be used in the bridge configuration in the case of a single-phase ac power supply, and six diodes may be used in the bridge configuration in the case of a three-phase ac power supply.

For the converter 410, for example, a half-bridge converter in which two switching elements and four diodes are connected may be used, and in the case of a three-phase ac power supply, six switching elements and six diodes may be used.

In the case where the converter 410 has switching elements, the boosting operation, the power factor improvement, and the dc power conversion can be performed by the switching operation of the respective switching elements.

In addition, the converter 410 may include a Switched Mode Power Supply (SMPS) having a switching element and a transformer.

In addition, the converter 410 may convert the level of the input dc power to output the converted dc power.

The dc terminal capacitor C smoothes and stores the input power. One element is illustrated in the drawings as a dc terminal capacitor C, but a plurality may be provided to ensure element stability.

Although the drawing illustrates the case where the dc power is connected to the output terminal of the converter 410, the present invention is not limited thereto, and the dc power may be directly input.

For example, a direct current power supply from a solar cell is directly input to the dc terminal capacitor C, or is input after performing direct current/direct current conversion. Hereinafter, description will be mainly made of portions illustrated in the drawings.

In addition, the dc terminal capacitor C stores dc power at both ends, and thus may be named as a dc terminal or a dc link (link) terminal.

The dc terminal voltage detection portion B may detect a dc terminal voltage Vdc as both ends of the dc terminal capacitor C. For this reason, the dc terminal voltage detection portion B may include a resistance element, an amplifier, and the like. The detected dc terminal voltage Vdc is a pulse-shaped discrete signal (discrete signal), and may be input to the inverter control unit 430 or the main control unit 210. The figure illustrates a case where an input is made to the main control section 210.

The inverter 420 may include a plurality of inverter switching elements, and the smoothed dc power Vdc is converted into an ac power by on/off operations of the switching elements and output to the synchronous motor 630.

For example, when the synchronous motor 630 is three-phase, the inverter 420 may convert the dc power source Vdc into three-phase ac power sources va, vb, vc, and output the three-phase ac power sources va, vb, vc to the three-phase synchronous motor 630, as shown in the drawing.

As another example, when the synchronous motor 630 is a single-phase synchronous motor, the inverter 420 may convert the dc power Vdc into a single-phase ac power and output the single-phase ac power to the synchronous motor 630.

In the inverter 420, the upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S 'a, S' b, S 'c, which are respectively connected in series with each other, form a pair, and a total of three pairs of upper and lower arm switching elements are connected in parallel with each other (Sa & S' a, Sb & S 'b, Sc & S' c). Diodes are connected in anti-parallel to the switching elements Sa, S ' a, Sb, S ' b, Sc, and S ' c.

The plurality of switching elements in the inverter 420 perform on/off operations of the respective switching elements based on an inverter switching control signal Sic from the inverter control unit 430. Thereby, an ac power having a predetermined frequency is output to the synchronous motor 630.

The inverter control part 430 may output a switching control signal Sic to the inverter 420.

In particular, the inverter control unit 430 may output the switching control signal Sic to the inverter 420 based on the voltage command value Sn input from the main control unit 210.

Further, inverter control unit 430 may output voltage information Sm of circulation pump motor 730 to main control unit 210 based on voltage command value Sn or switching control signal Sic.

As shown in fig. 4 or 5, the inverter 420 and the inverter control unit 430 may be configured as one inverter module IM.

The main control unit 210 can control the switching operation of the inverter 420 on the basis of the sensorless system.

For this purpose, the main control unit 210 may receive the output current io detected by the output current detection unit E and the dc terminal voltage Vdc detected by the dc terminal voltage detection unit B.

The main control part 210 may calculate power based on the output current io and the dc-terminal voltage Vdc and output a voltage command value Sn based on the calculated power.

In particular, the main control unit 210 may perform power control and output the voltage command value Sn based on the power control for stable operation of the circulation pump motor 730. Thus, inverter control unit 430 can output corresponding switching control signal Sic based on voltage command value Sn for power control.

The output current detection section E may detect the output current io flowing between the three-phase circulation pump motors 730.

The output current detection unit E may be disposed between the three-phase circulation pump motor 730 and the inverter 420, and detect the output current io flowing through the motor. The drawing illustrates a case where a-phase current is detected in phase currents ia, ib, and ic (phase current) which are output currents io flowing in the circulation pump motor 730.

In addition, unlike the drawing, it may be configured such that the output current flowing in the motor is sequentially detected between the dc-side capacitor C and the inverter 420. At this time, the phase currents ia, ib, ic (phase current) flowing in the circulation pump motor 730 can be detected in a time division manner by using one shunt resistance element Rs.

The detected output current io is a pulse-shaped discrete signal (discrete signal), and may be input to the inverter control unit 430 or the main control unit 210. The figure illustrates a case where the input is input to the main control section 210.

The three-phase circulation pump motor 730 includes a stator (stator) and a rotor (rotor), and the rotor is rotated by applying respective ac power supplies of predetermined frequencies to coils of the stator of respective phases (a phase, b phase, and c phase).

Such a circulation pump motor 730 may include a BrushLess (BLDC) DC motor.

For example, the circulation pump Motor 730 may include a Surface-Mounted Permanent Magnet Synchronous Motor (SMPMSM), an embedded Permanent Magnet Synchronous Motor (IPMSM), a Synchronous Reluctance Motor (Synchronous Motor), and the like. The SMPMSM and the IPMSM are Synchronous motors (PMSM) adopting Permanent magnets, and the Synrm is characterized by not having Permanent magnets.

Fig. 6 is an internal block diagram of the main control unit of fig. 5.

Referring to fig. 6, the main control part 210 may include: a speed calculation unit 520, a power calculation unit 521, a power controller 523, and a speed controller 540.

The speed calculation part 520 may calculate the speed of the circulation pump motor 730 based on the voltage information Sm of the circulation pump motor 730 received from the inverter control part 430.

Specifically, the speed calculation section 520 may calculate a zero crossing (zero crossing) for the voltage information Sm of the circulation pump motor 730 received from the inverter control section 430, and calculate the speed () of the circulation pump motor 730 based on the zero crossing.

The power calculation part 521 may calculate the power P to be supplied to the circulation pump motor 730 based on the output current io detected in the output current detection part E and the dc terminal voltage Vdc detected in the dc terminal voltage detection part B.

The power controller 523 may generate the speed command value ω r based on the power P calculated by the power calculation unit 521 and the set power command value P r.

For example, in the power controller 523, the PI controller 525 may perform PI control based on the difference between the calculated power P and the power command value P × r and generate the speed command value ω × r.

Further, the speed controller 540 may generate the voltage command value Sn based on the speed () calculated by the speed calculation unit 520 and the speed command value ω r generated by the power controller 523.

Specifically, in the speed controller 540, the PI controller 544 may perform PI control based on the difference between the calculated speed () and the speed command value ω × r, and generate the voltage command value Sn based on this.

The generated voltage command value Sn may be output to the inverter control unit 430.

The inverter control unit 430 may receive an input of the voltage command value Sn from the main control unit 210, and generate and output an inverter switching control signal Sic based on the pulse width modulation PWM method.

The output inverter switching control signal Sic may be converted into a gate driving signal by a gate driving unit (not shown) and input to the gate of each switching element in the inverter 420. Thereby, the switching elements Sa, S ' a, Sb, S ' b, Sc, and S ' c in the inverter 420 perform switching operations. This enables stable power control.

In addition, the main control part 210 of the embodiment of the present invention may control the power supplied to the circulation pump motor 730 to be constant rather than to be decreased as time passes, when circulating the suction. This can shorten the drainage time.

In addition, the main control unit 210 according to the embodiment of the present invention may perform power control on the circulation pump motor 730 when the water discharge is started, and may control the power control to be ended when the residual water is reached. This enables the drainage operation to be performed efficiently.

In addition, the main control unit 210 according to the embodiment of the present invention may control the duty of the switching control signal Sic to be larger as the level of the output current io is smaller and the voltage command value Sn is larger. This enables the circulation pump motor 730 to be driven at a constant power.

In addition, the circulation pump motor 730 of the embodiment of the present invention may be implemented by a BrushLess (BrushLess) DC motor 630. This makes it possible to easily realize power control other than constant speed control.

In addition, the main control part 210 according to the embodiment of the present invention may control the speed of the circulation pump motor 730 to be increased if the power supplied to the circulation pump motor 730 during the circulation suction does not reach the first power, and to be decreased if the power supplied to the circulation pump motor 730 exceeds the first power.

In addition, the main control part 210 according to the embodiment of the present invention may control the speed of the circulation pump motor 730 to be constant when the power supplied to the circulation pump motor 730 reaches the first power.

As described above, since the power control is performed to drive at a constant power, the converter 410 only needs to supply a constant power, and thus the stability of the converter 410 can be improved. Also, by performing the power control, it is possible to minimize the situation in which the drainage performance is reduced according to the installation condition.

Also, the circulation pump motor 730 can be stably driven, and thus the drainage time can be shortened.

Fig. 7 is a diagram showing power supplied to the motor in correspondence with power control and speed control.

First, as described in the embodiment of the present invention, in the case of performing power control, a waveform of power supplied to the circulation pump motor 730 according to the passage of time may be exemplified as Pwa.

The figure illustrates a case where power is kept approximately constant as power control is performed up to a Tm1 point and power control is ended at a Tm1 point.

The main control part 210 may control the power supplied to the circulation pump motor 730 to be constant, not to be decreased with the passage of time, by performing the power control at the time of the circulation suction, even if the water level of the washing tub 120 is lowered.

The main control part 210 may control the power supplied to the circulation pump motor 730 to the first power P1 by performing the power control at the time of the circulation suction.

In particular, even if the head is changed, the main control part 210 may control the power supplied to the circulation pump motor 730 to be the constant first power P1 by performing the power control at the time of the circulation pumping.

At this time, the constant first power P1 may mean that the circulation pump motor 730 is driven at a power within the first allowable range Prag with reference to the first power P1. For example, the range Prag may correspond to a case where the pulse rate is within approximately 10% based on the first power P1.

Fig. 7 illustrates that, when the power control is executed, the circulation pump motor 730 is driven at a power within the first allowable range Prag with reference to the first power P1 from the Tseta point to the end point Tm1, excluding the Pov period of the overshoot (overshoot). Thereby, water pumping can be smoothly performed even if the head is changed at the time of circulation suction. Also, the stability of the converter 410 can be improved.

Wherein the greater the level of the first power P1, the greater the first allowable range Prag may be. And, the longer the finalization period Pbs is, the larger the first allowable range Prag may be.

For this reason, when performing power control during cyclic suction, the main control unit 210 may calculate power based on the output current io and the dc terminal voltage Vdc and output a voltage command value Sn based on the calculated power, and the inverter control unit 430 may output a switching control signal Sic to the circulation pump motor 730 based on the voltage command value Sn.

The main control unit 210 may control the duty of the switching control signal Sic to be larger as the level of the output current io is smaller, while increasing the voltage command value Sn. Thereby, the circulation pump motor 730 can be driven at a constant power.

In addition, in order to perform the power control, the main control part 210 may control to sharply increase the power supplied to the circulation pump motor 730 in the Pov period.

Further, the main control unit 210 may control the power supplied to the circulation pump motor 730 to be rapidly decreased from Tm1 when the power control is completed.

Next, unlike the embodiment of the present invention, in the case of performing speed control, that is, in the case of controlling the speed of the circulation pump motor 730 to be constant, the waveform of power supplied to the circulation pump motor 730 over time may be exemplified as Pwb.

The figure illustrates a case where the velocity control is executed to a time point Tm2 and the velocity control is ended at a time point Tm 2.

According to the power waveform Pwb based on the speed control, at the time of the circulation pumping, as the water level of the washing tub is lowered, although the speed of the circulation pump motor 730 is maintained constant, the power supplied to the circulation pump motor 730 may be sequentially lowered.

Fig. 7 illustrates a case where the power supplied to the circulation pump motor 730 is sequentially reduced during the speed control interval Pbsx, and is reduced to substantially Px at Tm2, which is the completion time.

Thus, the circulation pump motor 730 operation end time in the speed control is Tm2, which is delayed by substantially Tx time period compared to the power control.

As a result, according to the embodiment of the present invention, by performing the power control, the approximate Tx period size can be shortened in the cyclic pumping as compared with the speed control. Further, the power supplied from converter 410 can be kept constant, and the operation stability of converter 410 can be improved.

Fig. 8 and 9 are views showing the external appearance of the circulation pump driving apparatus according to the embodiment of the present invention.

Referring to fig. 8 and 9, the washing water is discharged through the drain flow path 143 connected to the washing tub 120, and the drain flow path 143 is connected to the water inlet portion ITa of the circulation pump 171.

The water inlet portion ITa is formed as a hollow pipe, and a vortex chamber ROOM having an area larger than the diameter of the water inlet portion ITa is formed inside the water inlet portion ITa.

The swirl chamber ROOM is provided with an impeller IPR that is rotated by the rotational force of the circulation pump motor 730.

Further, the circulation pump motor 730 and a circuit board PCB for applying an electric signal to the circulation pump motor 730 may be disposed on the opposite surface of the water inlet portion ITa with reference to the impeller IPR. The circulation pump driving device 720 described above may be disposed on the circuit board PCB.

In addition, two water outlet portions OTa and OTb for discharging water may be disposed on one side of the vortex chamber ROOM in a direction crossing the water inlet portion ITa. At this time, the water outlet portions OTa and OTb may be connected to the circulation channel 144.

Thus, the washing water pumped from circulation pump 171 can be again fed into washing tub 120 through circulation flow path 144.

In addition, in order to achieve smooth drainage, the outlet portions OTa and OTb may be formed along a normal direction of the vortex chamber ROOM. Such a circulation pump 171 configuration may be termed a volute (volume) drain pump configuration.

In the case of such a volute (volume) type drain pump structure, since the water outlet portions OTa, OTb are formed at one side of the vortex chamber ROOM, the rotation direction of the circulation pump motor 730 is preferably rotated in the clockwise direction CCW with reference to fig. 9.

In addition, as described above, since the drain pipe 199 is located at a higher position than the circulation pump 171, the water outlet portions OTa, OTb may be formed obliquely in the direction of the drain pipe 199.

Similarly, the water inlet portion ITa may be formed obliquely, and the inclination angle of the water inlet portion ITa with respect to the ground may be smaller than that of the water outlet portions OTa and OTb. Accordingly, the water can be better introduced into the water inlet portion ITa, and the water in the vortex chamber ROOM can be discharged to the outside through the water outlet portions OTa and OTb by the impeller IPR rotated by the rotational force of the circulation pump motor 730.

Fig. 10 is a diagram for reference in explaining the operation of the circulation pump motor.

Referring to the drawing, the horizontal axis represents the level of the output current flowing through the circulation pump motor, and the vertical axis represents the washing ratio with respect to the laundry in the washing tub 120.

The washing ratio is a numerical value representing the washing information of the laundry, and the higher the number of the washing ratio is, the higher the washing power can be represented.

As can be seen from the drawing, the output current level on the horizontal axis increases from the right side to the left side, and the cleaning ratio increases.

Therefore, in the present invention, in order to increase the washing force by the circulation suction during washing, it is suggested to increase the power applied to the circulation pump motor 730.

Further, it is suggested that the washing power by the circulation suction at the time of washing can be increased in the case of efficiently using the power consumption.

Therefore, the present invention provides a scheme in which the circulation pump motor 730 operates according to the movement of the washing tub 120.

For example, when the laundry is stuck to the washing tub 120 and rotated, the circulation pump motor 730 is operated at a constant speed, and thus the washing water is injected through the injection ports OPa to OPd formed in the washing tub 120, thereby improving the washing power.

As another example, when the washing tub motor 230 operates at a speed at which the laundry moves in the lower portion of the washing tub 120, the speed of the circulation pump motor 730 repeatedly increases and decreases, and thus the washing water is injected through the injection ports OPa to OPd formed in the washing tub 120, thereby improving the washing power.

As another example, when the washing tub motor 230 operates at a speed at which the laundry moves from the lower portion to the upper portion of the washing tub 120 and drops from the upper portion, the speed of the circulation pump motor 730 is kept constant after being increased at the first and second rising slopes, and thus the washing water is injected through the injection ports OPa to OPd formed in the washing tub 120, thereby improving the washing power. This is described with reference to fig. 11 and subsequent figures.

Fig. 11 is a flowchart illustrating an operation method of the laundry treatment apparatus according to the embodiment of the present invention, and fig. 12 to 15c are diagrams for reference in explaining the operation method of fig. 11.

Referring to the drawings, the main control part 210 may control the operation of the tub motor 230 (step S1110).

During washing, the tub motor 230 may be operated at a speed at which the laundry is stuck to the tub 120, at a speed at which the laundry moves in the lower part of the tub 120, or at a speed at which the laundry moves from the lower part to the upper part of the tub 120 and drops from the upper part.

Next, the main control part 210 may control the circulation pump motor 730 to operate in at least two modes of the first to third modes according to the operation of the washing tub motor 230 (step S1120). This can improve the washing power by the circulation suction during washing.

The first mode MD1 indicates a mode in which the speed of the circulation pump motor 730 is constant, the second mode MD2 indicates a mode in which the speed of the circulation pump motor 730 repeatedly rises and falls, and the third mode MD3 indicates a mode in which the speed of the circulation pump motor 730 first rises at a first rising gradient and a second rising gradient and then is kept constant.

In addition, according to another embodiment of the present invention, the main control part 210 may divide the modes into a first mode MD1 in which the power of the circulation pump motor 730 is constant, a second mode MD2 in which the power of the circulation pump motor 730 is repeatedly increased and decreased, and a third mode MD3 in which the power of the circulation pump motor 730 is first increased at a first increase slope and then is kept constant, and control the circulation pump motor 730 to operate in at least two modes among the first mode MD1 to the third mode MD 3. This can improve the washing power by the circulation suction during washing.

Fig. 12 (a) illustrates a case where the tub motor 230 operates at a speed at which laundry is stuck to the tub 120. Thus, the main control unit 210 can control the speed of the circulation pump motor 730 to be constant.

Fig. 12 (b) illustrates a case where the washing tub motor 230 operates at a speed at which the laundry moves in the lower portion of the washing tub 120. In particular, when the washing tub 120 is cylindrical, the washing tub motor 230 is operated at a speed at which the laundry moves in the lower portion Ara with reference to the virtual line Wref.

Accordingly, the main control unit 210 can control the speed of the circulation pump motor 730 to be repeatedly increased and decreased.

Fig. 12 (c) illustrates a case where the washing tub motor 230 operates at a speed at which the laundry is stuck to the washing tub 120. In particular, when the washing tub 120 has a cylindrical shape, the washing tub motor 230 is operated at a speed at which the laundry moves from the lower portion Ara to the upper portion Arb of the washing tub 120 and drops from the upper portion Arb, based on the virtual line Wref.

Accordingly, the main control unit 210 may control the speed of the circulation pump motor 730 to be constant after increasing at the first and second rising slopes.

As shown in the figure, the main control part 210 may control the first mode MD1 of fig. 12 (a), the second mode MD2 of fig. 12 (b), and the third mode MD3 of fig. 12 (c) to be sequentially and repeatedly executed. This can improve the washing power by the circulation suction during washing.

Fig. 13a is a diagram illustrating the first mode MD1 of fig. 12 (a) in detail.

Referring to the drawings, in order to rotate the circulation pump motor 730 at a constant speed in the first mode MD1, the main control part 210 may increase the speed of the circulation pump motor 730 according to the increasing slope Sa1 and decrease the speed of the circulation pump motor 730 according to the decreasing slope Sa 3.

At this time, the rising slope and the falling slope may differ only in polarity, but have the same magnitude.

Fig. 13b is a diagram illustrating the second mode MD2 of fig. 12 (b) in detail.

Referring to the drawing, in order to repeatedly increase and decrease the speed of the circulation pump motor 730 in the second mode MD2, the main controller 210 may increase the speed of the circulation pump motor 730 according to the increase slope Sb1, increase the speed of the circulation pump motor 730 according to the increase slope Sb2, decrease the speed of the circulation pump motor 730 according to the decrease slope Sb3, repeat two times of increase and decrease according to the increase slope Sb2 and the decrease slope Sb3, and decrease the speed of the circulation pump motor 730 according to the decrease slope Sb 8.

At this time, the rising slope Sb1 is preferably larger than the rising slope Sb 2. This enables the speed of the circulation pump motor 730 to be raised quickly.

In addition, the rising slope Sb2 and the falling slope Sb3 may differ only in polarity and be the same in magnitude.

Further, the rising slope Sb1 and the falling slope Sb8 may differ only in polarity and be the same in magnitude.

Fig. 13c is a diagram illustrating the third mode MD3 of fig. 12 (c) in detail.

Referring to the drawings, in order to repeatedly increase and decrease the speed of the circulation pump motor 730 in the third mode MD3, the main controller 210 may increase the speed of the circulation pump motor 730 according to the increase slope Sc1, then increase the speed of the circulation pump motor 730 according to the increase slope Sc2, then rotate the circulation pump motor 730 at a constant speed, and then decrease the speed of the circulation pump motor 730 according to the decrease slope Sc 4.

At this time, the rising slope Sc1 is preferably larger than the rising slope Sc 2. This enables the speed of the circulation pump motor 730 to be raised quickly.

The rising slope Sc2 in fig. 13c may be the same as the rising slope Sb2 in fig. 13 b.

In addition, fig. 14 illustrates a case where the first to third modes are performed with reference to power.

Referring to the drawings, the main controller 210 may divide the modes into a first mode MD1 in which the power of the circulation pump motor 730 is constant as shown in fig. 14 (a), a second mode MD2 in which the power of the circulation pump motor 730 is repeatedly increased and decreased as shown in fig. 14 (b), and a third mode MD3 in which the power of the circulation pump motor 730 is first increased at a first increase slope and a second increase slope and then is kept constant as shown in fig. 14 (c), and operate the circulation pump motor 730 in the three modes.

As described above, the first mode of fig. 14 (a) can be executed when the tub motor 230 operates at a speed at which the laundry is stuck to the tub 120, the second mode of fig. 14 (b) can be executed when the tub motor 230 operates at a speed at which the laundry moves in the lower part of the tub 120, and the third mode of fig. 14 (c) can be executed when the tub motor 230 operates at a speed at which the laundry moves from the lower part to the upper part of the tub 120 and drops from the upper part. This can improve the washing power by the circulation suction during washing.

Fig. 15a illustrates a case where the circulation pump motor 730 is also stopped in a state where the washing tub motor 230 is stopped, and the washing water is not sprayed through the spray ports OPa to OPd formed in the washing tub 120.

Next, fig. 15b illustrates a case where the washing tub motor 230 is rotated and the circulation pump motor 730 is also rotated in synchronization therewith, so that the washing water circulated and sucked by the circulation pump 171 is sprayed through the injection ports OPa to OPd formed in the washing tub 120.

For this reason, the main control part 210 may control to spray the washing water circulated and pumped by the circulation pump 171 through the injection ports OPa to OPd formed in the washing tub 120 in synchronization with the operation time of the washing tub motor 230.

In particular, fig. 15b illustrates a case where the washing water circulated and sucked by the circulation pump 171 is strongly sprayed when the washing water is operated at the power of R1 in fig. 14 (a), the washing water is operated at the power of R3 in fig. 14 (b), or the washing water is operated at the power of R5 in fig. 14 (c).

Next, fig. 15c illustrates a case where the washing tub motor 230 is rotated and the circulation pump motor 730 is also rotated in synchronization therewith, and the washing water circulated and sucked by the circulation pump 171 is sprayed through the injection ports OPa to OPd formed in the washing tub 120.

In particular, fig. 15b illustrates a case where the washing water circulated and sucked by the circulation pump 171 is weakly sprayed when the washing water is operated at the power of R2 in fig. 14 (b) or at the power of R4 in fig. 14 (c).

Although fig. 1 shows a front load type as an example of the laundry treatment apparatus, the driving apparatus 720 of the circulation pump according to the embodiment of the present invention can be applied to a top load type as well.

The driving device 720 of the circulation pump according to the embodiment of the present invention is applicable to various devices such as a dishwasher, an air conditioner, and the like, in addition to the laundry treatment device 100.

The driving device of the circulation pump and the laundry treatment apparatus having the same according to the embodiments of the present invention are not limited to the configurations and methods of the above-described embodiments, but may be selectively combined and configured by all or a part of the embodiments, and various modifications may be made to the embodiments.

The driving device of the circulation pump and the operation method of the laundry treatment device according to the present invention can be realized by processor-readable codes provided in processor-readable recording media of the driving device of the circulation pump and the laundry treatment device, respectively. The recording medium readable by the processor includes all kinds of recording devices that store data that can be read by the processor.

While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the specific embodiments described above, and various modifications can be made by those skilled in the art without departing from the technical spirit of the present invention, and such modifications should not be construed as deviating from the technical spirit or the prospect of the present invention.