阅读说明：本技术 开关电路、电机控制系统和吸尘器 (Switch circuit, motor control system and dust catcher ) 是由 卢铁斌 宾宏 赵小安 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种开关电路、电机控制系统和吸尘器,其中,开关电路包括：供电单元；使能单元；控制器；开关单元；其中,控制器用于在接收端接收到开信号时,通过发送端持续输出使能信号,直至接收端接收到关信号,且将该使能信号维持到执行完停机控制程序后,其中,控制器还用于,在接收端接收到开信号时,开始执行电机运行控制程序,在接收端接收到关信号时,开始执行电机停机控制程序。该开关电路能够在实现零电流待机功耗的同时,避免由于开关电路处于不可控的状态而使得电机进入自由停机状态,从而避免出现较长时间的停机尾音和低频振动,提升用户使用体验,且无需增加延时处理电路,具有成本低、可靠性强的优点。(The invention discloses a switching circuit, a motor control system and a dust collector, wherein the switching circuit comprises: a power supply unit; an enabling unit; a controller; a switch unit; the controller is used for continuously outputting an enabling signal through the sending end when the receiving end receives the on signal until the receiving end receives the off signal and maintaining the enabling signal until the stop control program is executed, wherein the controller is also used for starting to execute the motor operation control program when the receiving end receives the on signal and starting to execute the motor stop control program when the receiving end receives the off signal. This switch circuit can avoid making the motor get into free shutdown state because switch circuit is in uncontrollable state when realizing zero current standby power consumption to avoid appearing longer shut down tail sound and low frequency vibration, promote the user and use and experience, and need not to increase delay processing circuit, have with low costs, advantage that the reliability is strong.)

1. A switching circuit, comprising:

a power supply unit;

an enable unit for outputting a switching signal, wherein the switching signal includes an on signal and an off signal;

the controller comprises a power supply end, a receiving end and a sending end, and the receiving end is connected with the enabling unit;

the switch unit is respectively connected with the power supply unit, the enabling unit, the power supply end and the sending end, and the switch unit is used for establishing power supply connection between the controller and the power supply unit according to an on signal output by the enabling unit or an enabling signal output by the sending end when the switch unit receives the on signal output by the enabling unit or the enabling signal output by the sending end:

the controller is configured to continuously output the enable signal through the sending end when the receiving end receives the on signal until the receiving end receives the off signal, and maintain the enable signal until the receiving end completes execution of the motor shutdown control program, where the controller is further configured to start execution of the motor operation control program when the receiving end receives the on signal, and start execution of the motor shutdown control program when the receiving end receives the off signal.

2. The switching circuit according to claim 1, wherein the switching unit includes:

a first terminal of the first switch subunit is connected with the power supply unit, and a second terminal of the first switch subunit is connected with the power supply terminal;

the first end of the second switch subunit is connected with the control end of the first switch subunit, the second end of the second switch subunit is grounded, and the control end of the second switch subunit is connected with the enabling unit and the sending end respectively.

3. The switching circuit of claim 2, wherein the first switching subunit comprises:

the first end of the first switch tube is connected with the power supply unit, the second end of the first switch tube is connected with the power supply end of the controller, and the control end of the first switch tube is connected with the first end of the second switch subunit.

4. The switching circuit of claim 3, wherein the second switching subunit comprises:

and the first end of the second switch tube is connected with the control end of the first switch tube, the second end of the second switch tube is grounded, and the control end of the second switch tube is respectively connected with the enabling unit, the receiving end and the sending end of the controller.

5. The switching circuit of claim 4, wherein the first switching subunit further comprises:

one end of the first resistor is connected with the first end of the first switch tube, and the other end of the first resistor is connected with the control end of the first switch tube to form a first node.

6. The switching circuit of claim 5, wherein the second switching subunit further comprises:

one end of the second resistor is connected with the first node, and the other end of the second resistor is connected with the first end of the second switching tube;

one end of the third resistor is connected with the receiving end of the controller, and the other end of the third resistor is connected with the enabling unit to form a second node;

one end of the fourth resistor is connected with the second node, and the other end of the fourth resistor is connected with the control end of the second switching tube to form a third node;

and one end of the fifth resistor is connected with the sending end of the controller, and the other end of the fifth resistor is connected with the third node.

7. The switching circuit of claim 6, wherein the second switching subunit further comprises:

one end of the sixth resistor is connected with the third node, and the other end of the sixth resistor is grounded;

a first capacitor connected in parallel with the sixth resistor.

8. The switching circuit according to claim 4, wherein the first switching tube is a P-MOS transistor, and the second switching tube is an NPN transistor.

9. A motor control system, comprising:

a motor;

a drive circuit connected to the motor;

the switching circuit according to any one of claims 1-8, comprising a controller for controlling the motor by the drive circuit.

10. A vacuum cleaner comprising a motor control system according to claim 9.

Technical Field

The invention relates to the technical field of power supply, in particular to a switch circuit, a motor control system and a dust collector.

Background

To battery powered consumer, often have certain requirement to stand-by power consumption, need to cut off the controller power when consumer shuts down, guarantee minimum stand-by power consumption, and the controller outage back, lost control to consumer, the consumer is in uncontrollable state promptly, for example hand-held type dust catcher, its motor free shutdown after the outage, will appear the shut down tail sound and the low frequency vibration of longer time, seriously influenced user's use and experienced.

In order to solve the problem, a common processing means is to add a delay processing circuit, which inevitably needs to increase material cost, increase the number of device materials, reduce system reliability, and set the delay time length, thereby increasing system debugging time.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, an object of the present invention is to provide a switching circuit, which can avoid a motor from entering a free shutdown state due to an uncontrollable state of the switching circuit while achieving zero current standby power consumption, thereby avoiding a shutdown tail tone and low frequency vibration for a long time, improving user experience, and having the advantages of low cost and high reliability without adding a delay processing circuit.

Another object of the present invention is to provide a motor control system.

It is a further object of the present invention to provide a vacuum cleaner.

To achieve the above object, an embodiment of a first aspect of the present invention provides a switching circuit, including: a power supply unit; an enable unit for outputting a switching signal, wherein the switching signal includes an on signal and an off signal; the controller comprises a power supply end, a receiving end and a sending end, and the receiving end is connected with the enabling unit; the switch unit is respectively connected with the power supply unit, the enabling unit, the power supply end and the sending end, and the switch unit is used for establishing power supply connection between the controller and the power supply unit according to an on signal output by the enabling unit or an enabling signal output by the sending end when the switch unit receives the on signal output by the enabling unit or the enabling signal output by the sending end: the controller is configured to continuously output the enable signal through the sending end when the receiving end receives the on signal until the receiving end receives the off signal and maintain the enable signal until the execution of a motor shutdown control program is completed, and the controller is further configured to start execution of a motor operation control program when the receiving end receives the on signal; and when the receiving end receives the off signal, starting to execute the motor stop control program.

According to the switching circuit provided by the embodiment of the invention, the switching unit controls the power supply unit to supply power to the controller according to the on signal and the enable signal, when the receiving end receives the off signal, the shutdown control program is started to be executed, and after the execution of the shutdown control program is finished, the controller stops working. From this, can be when realizing zero current standby power consumption, avoid making the motor get into free shutdown state because switch circuit is in uncontrollable state, avoid appearing longer shut down tail sound and low frequency vibration, promote the user and use experience, and need not to increase time delay processing circuit, make it have with low costs, advantage that the reliability is strong.

In addition, the switch circuit according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the present invention, the switching unit includes: a first terminal of the first switch subunit is connected with the power supply unit, and a second terminal of the first switch subunit is connected with the power supply terminal; the first end of the second switch subunit is connected with the control end of the first switch subunit, the second end of the second switch subunit is grounded, and the control end of the second switch subunit is connected with the enabling unit and the sending end respectively.

According to one embodiment of the invention, the first switch subunit comprises: the first end of the first switch tube is connected with the power supply unit, the second end of the first switch tube is connected with the power supply end of the controller, and the control end of the first switch tube is connected with the first end of the second switch subunit.

According to one embodiment of the invention, the second switch subunit comprises: and the first end of the second switch tube is connected with the control end of the first switch tube, the second end of the second switch tube is grounded, and the control end of the second switch tube is respectively connected with the enabling unit, the receiving end and the sending end of the controller.

According to an embodiment of the invention, the first switch subunit further comprises: one end of the first resistor is connected with the first end of the first switch tube, and the other end of the first resistor is connected with the control end of the first switch tube to form a first node.

According to an embodiment of the invention, the second switch subunit further comprises: one end of the second resistor is connected with the first node, and the other end of the second resistor is connected with the first end of the second switching tube; one end of the third resistor is connected with the receiving end of the controller, and the other end of the third resistor is connected with the enabling unit to form a second node; one end of the fourth resistor is connected with the second node, and the other end of the fourth resistor is connected with the control end of the second switching tube to form a third node; and one end of the fifth resistor is connected with the sending end of the controller, and the other end of the fifth resistor is connected with the third node.

According to an embodiment of the invention, the second switch subunit further comprises: one end of the sixth resistor is connected with the third node, and the other end of the sixth resistor is grounded; a first capacitor connected in parallel with the sixth resistor.

According to an embodiment of the invention, the first switching tube adopts a P-MOS tube, and the second switching tube adopts an NPN triode.

In order to achieve the above object, a second embodiment of the present invention provides a motor control system, including: a motor; the motor driving circuit is connected with the motor; in an embodiment of the first aspect of the present invention, the switching circuit includes a controller, and the controller is configured to control the motor through the driving circuit.

According to the motor control system provided by the embodiment of the invention, the switching circuit provided by the embodiment of the invention can realize zero current standby power consumption, simultaneously prevent the motor from being in an uncontrollable free stop state due to out-of-control, avoid long-time stop tail sound and low-frequency vibration, improve the user experience, and has the advantages of low cost and strong reliability without adding a delay processing circuit.

In order to achieve the above object, a vacuum cleaner according to a third embodiment of the present invention includes the motor control system according to the second embodiment of the present invention.

According to the dust collector disclosed by the embodiment of the invention, through the motor control system disclosed by the embodiment of the invention, the motor can be prevented from being in an uncontrollable free stop state due to out-of-control while zero-current standby power consumption is realized, the stop tail sound and low-frequency vibration for a long time are avoided, the use experience of a user is improved, and a delay processing circuit is not required to be added, so that the dust collector has the advantages of low cost and high reliability.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a block diagram of a switching circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the structure of a switching circuit according to an example of the present invention;

FIG. 4 is a schematic diagram of another exemplary switching circuit of the present invention;

fig. 5 is a block diagram of a motor control system of an embodiment of the present invention;

FIG. 6 is a schematic diagram of the structure of a motor control system according to an example of the present invention;

fig. 7 is a block diagram showing a structure of a cleaner according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The switching circuit, the motor control system, and the cleaner according to the embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a block diagram of a switching circuit according to an embodiment of the present invention.

As shown in fig. 1, the switching circuit 100 includes: a power supply unit 10, an enabling unit 20, a controller 30, and a switching unit 40.

The enabling unit 20 is configured to output a switching signal, where the switching signal includes an on signal and an off signal; the controller 30 comprises a power supply terminal 31, a receiving terminal 32 and a transmitting terminal 33, wherein the receiving terminal 32 is connected with the enabling unit 20; the switch unit 40 is connected to the power supply unit 10, the enabling unit 20, the power supply terminal 31 and the transmitting terminal 33, respectively, and the switch unit 40 is configured to establish a power supply connection between the controller 30 and the power supply unit 10 according to an on signal output by the enabling unit 20 or an enabling signal output by the transmitting terminal 33 when receiving the on signal output by the enabling unit 20 or the enabling signal output by the transmitting terminal 33: the controller 30 is configured to continuously output the enable signal through the sending terminal 33 when the receiving terminal 32 receives the on signal until the receiving terminal 32 receives the off signal and maintains the enable signal until the execution of the motor stop control program is completed, where the controller 30 is further configured to start to execute the motor operation control program when the receiving terminal 32 finishes receiving the on signal, and start to execute the motor stop control program when the receiving terminal 32 receives the off signal.

In this embodiment, the enable signal includes a low-level enable signal and a high-level enable signal, and when the enable signal output by the transmitting terminal 33 is at a high level or a low level, the switch unit 40 establishes a power supply connection between the controller 30 and the power supply unit 10 according to the on signal and the high-level enable signal output by the enable unit 20, so that the controller 30 is powered on. The on signal may be a high signal and the off signal may be a low signal.

Specifically, when the switch unit 40 receives an on signal or an enable signal, where the enable signal may be at a high level or a low level, the power supply circuit between the power supply unit 10 and the controller 30 is controlled to be turned on, that is, after the switch unit 40 performs an or operation on the switch signal and the enable signal, the power supply circuit is controlled to be turned on or off according to the or operated signal.

Specifically, in practical applications, a user may input a power-ON (ON) command to the enabling unit 20, the enabling unit 20 sends an ON signal to the switching unit 40 and the receiving terminal 32 according to the power-ON command, the switching unit 40 controls the power supply circuit between the power supply unit 10 and the controller 30 to be turned ON according to the ON signal, and then the controller 30 is powered ON; when the receiving terminal 32 receives the on signal from the enabling unit 20, the controller 30 starts executing the motor operation control program, continuously outputs the high level enabling signal through the transmitting terminal 33, and transmits the high level enabling signal to the switching unit 40, at this time, the power supply circuit continues to be turned on due to the on signal and the high level enabling signal, and the controller 30 continues executing the motor operation control program.

In the working process, if a user inputs a shutdown (OFF) command to the enabling unit 20, the switching unit 40 and the receiving terminal 32 respectively receive an OFF signal from the enabling unit 20, the controller 30 starts to execute the motor shutdown control program, and simultaneously controls the transmitting terminal 33 to continuously transmit a high-level enabling signal, so that the switching unit 40 continuously keeps the conduction of the power supply circuit due to the maintenance of the high-level enabling signal, that is, the power supply is normal, when the controller 30 finishes executing the motor shutdown control program, the transmitting terminal 33 outputs a low-level enabling signal, and at this time, the switching unit 40 disconnects the power supply connection between the power supply unit 10 and the controller 30 according to the OFF signal and the low-level enabling signal.

In general, when the controller 30 receives the off signal, the motor stop control program is started to be executed, at this time, the switching circuit 100 is not in an uncontrollable state, the switching unit 40 does not disconnect the power supply circuit between the power supply unit 10 and the controller 30, but the normal power supply is still maintained due to the maintenance of the enable signal, until the motor stop control program executed by the controller 30 is ended, the switching unit 40 disconnects the power supply connection, the controller 30 is powered off, and the zero-current standby is realized. Compared with the method that the controller 30 continues to control the switch circuit 100 when the shutdown control program is started by adding the delay processing circuit, the method and the device do not need to increase the material cost and debug the delay time, and have the advantages of low cost and simple and reliable operation.

According to the switching circuit provided by the embodiment of the invention, the switching unit controls the on-off state of the controller according to the switching signal and the enabling signal, so that the motor can be prevented from entering a free halt state due to the uncontrollable state of the switching circuit while the zero-current standby power consumption is realized, the long-time halt tail sound and low-frequency vibration are avoided, the use experience of a user is improved, and a delay processing circuit is not required to be added, so that the switching circuit has the advantages of low cost and high reliability.

In one embodiment of the present invention, as shown in fig. 2, the switching unit 40 may include: a first switching sub-unit 41 and a second switching sub-unit 42.

Wherein, a first end of the first switch subunit 41 is connected to the power supply unit 10, and a second end of the first switch subunit 41 is connected to the power supply terminal 31; a first end of the second switch subunit 42 is connected to the control end of the first switch subunit 41, a second end of the second switch subunit 42 is grounded to GND, and a control end of the second switch subunit 42 is connected to the enabling unit 20 and the transmitting end 33, respectively.

Specifically, the switch unit 40, when establishing the power supply connection between the controller 30 and the power supply unit 10 according to the on signal or the enable signal output by the transmitting end 33, may be configured to: the second switch subunit 42 performs an or operation on the on signal and the enable signal, and then controls the conduction of the first switch subunit 41 through the signal after the or operation, so as to establish the power supply connection between the controller 30 and the power supply unit 10. Therefore, the switch circuit has the advantages of simplicity and easiness in operation.

In one example of this embodiment, as shown in fig. 3, the first switch subunit 41 may include a first switch tube Q1. A first terminal of the first switching tube Q1 is connected to the power supply unit 10, a second terminal of the first switching tube Q1 is connected to the power supply terminal 31 of the controller 30, and a control terminal of the first switching tube Q1 is connected to a first terminal of the second switching subunit 42. The first switch Q1 may be a P-MOS (Metal Oxide Semiconductor) transistor, and the first end thereof may be a drain or a source, the second end thereof may be a source or a drain, and the control end thereof is a gate.

Further, referring to fig. 3, the second switching sub-unit 42 may include a second switching tube Q2. A first end of the second switch Q2 is connected to a control end of the first switch Q1, a second end of the second switch Q2 is grounded to GND, and a control end of the second switch Q2 is connected to the enabling unit 20, the receiving end 32 of the controller, and the transmitting end 33. The second switch Q2 may be an NPN transistor, and the first terminal thereof may be a collector, the second terminal thereof may be an emitter, and the control terminal thereof may be a base.

Specifically, in practical applications, a user may input a power-ON (ON) command to the enabling unit 20, the enabling unit 20 sends a power-ON signal to the control terminal of the second switch Q2 according to the power-ON command, the second switch Q2 is turned ON, so that the first switch Q1 is turned ON, and the power supply unit 10 supplies power to the power supply terminal 31 of the controller 30 through the first switch Q1, so as to power the controller 30; meanwhile, the receiving terminal 32 receives the on signal, and when the receiving terminal 32 receives the on signal, the controller 30 starts to execute the motor operation control program, and continuously outputs the high-level enable signal through the transmitting terminal 33, and sends the high-level enable signal to the control terminal of the second switching tube Q2, at this time, the first switching tube Q1 is still turned on, and the controller 30 continues to execute the motor operation control program.

In the working process, if a user inputs a power-OFF (OFF) command to the enabling unit 20, the second switch tube Q2 and the receiving end 32 respectively receive an OFF signal from the enabling unit 20, the controller 30 starts to execute the motor stop control program, and at the same time, the transmitting end 33 is controlled to continuously transmit the high-level enabling signal, so that the second switch tube Q2 continuously keeps the power supply circuit on due to the high-level enabling signal, the first switch tube Q1 keeps on, that is, the power supply is normal, when the controller 30 finishes executing the motor stop control program, the transmitting end 33 outputs the low-level enabling signal, and at this time, the second switch tube Q2 turns OFF the first switch tube Q1 according to the OFF signal and the low-level enabling signal, that is, the power supply connection between the power supply unit 10 and the controller 30 is disconnected.

That is, the second switching tube Q2 controls the first switching tube Q1 to be turned on and off according to the switching signal and the enable signal to control the power connection between the power supply unit 10 and the controller 30 of the power supply unit 10. Therefore, the switching circuit does not need a delay processing circuit, can avoid the uncontrollable state of the switching circuit when the controller executes the shutdown program, improves the user use experience, and has the advantages of simplicity and easy operation.

In another example, as shown in fig. 4, the first switching subunit 41 may further include a first resistor R1. One end of the first resistor R1 is connected to the first end of the first switch Q1, and the other end of the first resistor R1 is connected to the control end of the first switch Q1, and forms a first node d 1. The first resistor R1 can be used to protect the second switch transistor Q2, so as to prevent the second switch transistor Q2 from being damaged due to the fact that the current at the control end of the second switch transistor Q2 is too large, and guarantee the service life of the second switch transistor Q2.

Further, referring to fig. 4, the second switch subunit 42 may further include: a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

One end of the second resistor R2 is connected to the first node d1, and the other end of the second resistor R2 is connected to the first end of the second switch Q2; one end of the third resistor R3 is connected to the receiving terminal 32 of the controller 30, and the other end of the third resistor R3 is connected to the enabling unit 20, and forms a second node d 2; one end of the fourth resistor R4 is connected to the second node d2, and the other end of the fourth resistor R4 is connected to the control end of the second switch transistor Q2, and forms a third node d 3; one end of the fifth resistor R5 is connected to the transmitting terminal 33 of the controller 30, and the other end of the fifth resistor R5 is connected to the third node d 3.

Still further, referring to fig. 4, the second switch subunit 42 may further include: a sixth resistor R6 and a first capacitor C1. One end of the sixth resistor R6 is connected to the third node d3, and the other end of the sixth resistor R6 is grounded to GND; the first capacitor C1 is connected in parallel with the sixth resistor R6.

Specifically, if the user inputs a shutdown (OFF) command to the enabling unit 20, the second switch tube Q2 and the receiving terminal 32 respectively receive an OFF signal from the enabling unit 20, a current flows through the third resistor R3, the controller 30 starts to execute the motor shutdown control program, and at the same time, the transmitting terminal 33 is controlled to continuously transmit a high-level enabling signal to the control terminal of the second switch tube Q2, so that a voltage drop is generated on the fourth resistor R4, and the second switch tube Q2 continues to keep the first switch tube Q1 on due to the voltage drop, that is, the power supply is normal, when the controller 30 finishes executing the motor shutdown control program, the transmitting terminal 33 outputs a low-level enabling signal, and at this time, the second switch tube Q2 turns OFF the first switch hook Q1 according to the OFF signal and the low-level enabling signal, that is, the power supply connection between the power supply unit 10 and the controller 30 is disconnected.

In summary, the switching circuit according to the embodiment of the present invention controls the power on and off of the controller according to the switching signal and the enable signal, so that the zero current standby power consumption can be realized, and meanwhile, the power loss of the motor control circuit caused by the uncontrollable state of the switching circuit is avoided, so that the motor enters a free-stop state, a long-time stop tail sound and low-frequency vibration are avoided, the user experience is improved, and a delay processing circuit is not required to be added, so that the switching circuit has the advantages of low cost and strong reliability.

Based on the same inventive concept, the present invention provides a motor control system, and fig. 5 is a block diagram of the motor control system according to the embodiment of the present invention.

As shown in fig. 5, the motor control system 1000 includes: a motor M, a drive circuit 200 and a switching circuit 100 of the above-described embodiment of the present invention.

The driving circuit 200 is connected to the motor M, the switching circuit 100 includes a controller 30, and the controller 30 is configured to control the motor M through the driving circuit 200.

A specific embodiment of the motor control system 1000 is described below with reference to fig. 6:

specifically, in practical applications, a user may input a power-ON (ON) command to the enabling unit 20, the enabling unit 20 sends a power-ON signal to the control terminal of the second switch Q2 according to the power-ON command, the second switch Q2 is turned ON, so that the first switch Q1 is turned ON, and the power supply unit 10 supplies power to the power supply terminal 31 of the controller 30 through the first switch Q1, so as to power the controller 30; meanwhile, the receiving terminal 32 receives the on signal, and when the receiving terminal 32 receives the on signal, the controller 30 starts to execute a motor operation control program, that is, the driving circuit 200 is controlled to drive the motor M to operate, and continuously outputs the high-level enable signal through the transmitting terminal 33, and sends the high-level enable signal to the control terminal of the second switch tube Q2, at this time, the first switch tube Q1 is still turned on, and the controller 30 continues to control the driving circuit 200 to drive the motor M to operate.

In the operation process, if a user inputs a power-OFF (OFF) command to the enabling unit 20, the second switch tube Q2 and the receiving end 32 respectively receive an OFF signal from the enabling unit 20, the controller 30 starts to execute the motor stop control program, and simultaneously controls the transmitting end 33 to continuously transmit the high-level enabling signal, so that the second switch tube Q2 continuously keeps the power supply circuit on due to the maintenance of the high-level enabling signal, the first switch tube Q1 keeps on, that is, the power supply is normal, when the controller 30 finishes executing the stop control program, the transmitting end 33 outputs the low-level enabling signal, and at this time, the second switch tube Q2 turns OFF the first switch hook Q1 according to the OFF signal and the low-level enabling signal, that is, the power supply connection between the power supply unit 10 and the controller 30 is disconnected.

That is to say, when the user inputs a shutdown (OFF) command, the first switching tube Q1 will not be immediately turned OFF, the controller 30 still drives the motor M to operate through the driving circuit 200, meanwhile, the controller 30 starts to execute the shutdown control program and controls the motor M to brake, thereby avoiding the occurrence of an uncontrollable free shutdown phenomenon of the motor M, when it is determined that the execution of the motor shutdown control program is finished, for example, when the braking is finished, the first switching tube Q1 is controlled to be turned OFF, the controller 30 is immediately powered OFF, zero-current standby power consumption is realized, and a shutdown tail tone and low-frequency vibration of the motor for a long time are avoided.

According to the motor control system provided by the embodiment of the invention, the switching circuit provided by the embodiment of the invention controls the on-off state of the controller according to the switching signal and the enabling signal, so that the motor is prevented from being in an uncontrollable free stop state due to the loss of control while zero-current standby power consumption is realized, long-time stop tail sound and low-frequency vibration are avoided, the user experience is improved, and a delay processing circuit is not required to be added, so that the motor control system has the advantages of low cost and high reliability.

Based on the same inventive concept, the invention provides a dust collector, and fig. 7 is a structural block diagram of the dust collector of the embodiment of the invention.

As shown in fig. 7, the vacuum cleaner 10000 includes a motor control system 1000 according to the above embodiment of the present invention.

Specifically, in practical application, when the dust collector 10000 receives a shutdown instruction of a user, the controller 30 in the switch circuit 100 of the motor control system 1000 does not immediately power off but still normally works, and starts to execute a motor shutdown control program, that is, the dust collector 10000 is controlled to perform brake, so that a shutdown tail sound of the dust collector 10000 for a long time is avoided, and the controller 30 controls the power off of the dust collector after judging that the brake is finished, so that zero-current standby power consumption is realized. Wherein the vacuum cleaner 10000 may be a hand-held vacuum cleaner.

According to the dust collector disclosed by the embodiment of the invention, through the motor control system disclosed by the embodiment of the invention, the motor can be prevented from being in an uncontrollable free stop state due to out-of-control while zero-current standby power consumption is realized, the occurrence of long-time stop tail sound and low-frequency vibration is avoided, the use experience of a user is improved, and a delay processing circuit is not required to be added, so that the dust collector has the advantages of low cost and high reliability.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.