阅读说明：本技术 一种供电控制装置、空调及其供电控制方法 (Power supply control device, air conditioner and power supply control method of air conditioner ) 是由 刘晨瑞 金国华 李忠正 唐玉龙 蓝振进 于 2020-03-09 设计创作，主要内容包括：本发明公开了一种供电控制装置、空调及其供电控制方法,该装置包括：控制单元、开关单元和开关电源；其中,控制单元,用于确定电器的当前状态,并根据电器的当前状态确定电器的当前电源信号；开关单元,用于根据电器的当前电源信号,开通当前电源信号的控制支路；开关电源,用于根据当前电源信号的控制支路开通的信号调节当前开关频率。本发明的方案,可以解决空调的功耗大的问题,达到降低空调功耗的效果。(The invention discloses a power supply control device, an air conditioner and a power supply control method thereof, wherein the device comprises: the control unit, the switch unit and the switch power supply; the control unit is used for determining the current state of the electric appliance and determining the current power supply signal of the electric appliance according to the current state of the electric appliance; the switch unit is used for switching on a control branch of a current power supply signal according to the current power supply signal of the electric appliance; and the switching power supply is used for adjusting the current switching frequency according to the signal for controlling the branch circuit to be switched on of the current power supply signal. The scheme of the invention can solve the problem of large power consumption of the air conditioner and achieve the effect of reducing the power consumption of the air conditioner.)

1. A power supply control device characterized by comprising: the control unit, the switch unit and the switch power supply; wherein the content of the first and second substances,

the control unit is used for determining the current state of the electric appliance and determining the current power supply signal of the electric appliance according to the current state of the electric appliance;

the switch unit is used for switching on a control branch of a current power supply signal according to the current power supply signal of the electric appliance;

and the switching power supply is used for adjusting the current switching frequency according to the signal for controlling the branch circuit to be switched on of the current power supply signal.

2. The power supply control device according to claim 1, characterized by further comprising: an isolation unit;

and the isolation unit is used for carrying out photoelectric isolation on the signal for controlling the switching-on of the branch of the current power supply signal and then transmitting the signal to the control end of the switching power supply.

3. The power supply control device according to claim 1 or 2, wherein the current state includes: a standby state and an operating state; an operational state comprising: the load power consumption of the first load state is less than that of the second load state;

a current power supply signal comprising: any one of the first power signal, the second power signal, and the third power signal;

the control unit determines the current power supply signal of the electric appliance according to the current state of the electric appliance, and the method comprises the following steps:

if the current state is the standby state, the current power supply signal is a first power supply signal;

if the current state is the first load state, the current power supply signal is the second power supply signal;

and if the current state is the second load state, the current power supply signal is a third power supply signal.

4. The power supply control device according to claim 3, wherein the switching unit includes: a first switch module, a second switch module and a third switch module;

the switching power supply adjusts the current switching frequency according to the signal of the control branch circuit of the current power supply signal, including:

if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency;

if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal;

and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

5. The power supply control device according to claim 4, wherein,

a first switch module comprising: the device comprises a first switch tube, a first starting module, a first current dividing module and a first voltage dividing module; the first power supply signal is connected to the base electrode of the first switching tube through the first starting module, and the collector electrode of the first switching tube is connected to the direct-current power supply after passing through the first voltage division module and the second voltage division module respectively;

a second switch module comprising: the second switch tube, the second starting module, the second shunt module and the third shunt module; a second power supply signal is connected to a base electrode of a second switching tube through a second starting module, and a collector electrode of the second switching tube is connected to a common end of the first voltage division module and the first voltage division module through a second shunt module and a third shunt module which are connected in parallel;

a third switch module comprising: the third switching tube, the third starting module, the fourth shunting module and the fifth shunting module; and a collector of the third switching tube is connected to a common end of the first voltage division module and the first voltage division module after passing through the fourth voltage division module and the fifth voltage division module which are connected in parallel.

6. An air conditioner, comprising: the power supply control device according to any one of claims 1 to 5.

7. A power supply control method of an air conditioner according to claim 6, comprising:

determining the current state of the electric appliance through the control unit, and determining the current power supply signal of the electric appliance according to the current state of the electric appliance;

switching on a control branch of a current power supply signal according to the current power supply signal of the electric appliance through a switch unit;

and regulating the current switching frequency according to the signal for controlling the branch circuit to be switched on of the current power supply signal through the switching power supply.

8. The power supply control method according to claim 7, characterized by further comprising:

and after the signal of the control branch of the current power supply signal is subjected to photoelectric isolation through the isolation unit, the signal is transmitted to the control end of the switching power supply.

9. The power supply control method according to claim 7 or 8, wherein the current state includes: a standby state and an operating state; an operational state comprising: the load power consumption of the first load state is less than that of the second load state;

a current power supply signal comprising: any one of the first power signal, the second power signal, and the third power signal;

determining a current power signal of the electrical appliance according to a current state of the electrical appliance through the control unit, including:

if the current state is the standby state, the current power supply signal is a first power supply signal;

if the current state is the first load state, the current power supply signal is the second power supply signal;

and if the current state is the second load state, the current power supply signal is a third power supply signal.

10. The power supply control method according to claim 9, wherein adjusting the current switching frequency by the switching power supply according to the signal that the control branch of the current power supply signal is turned on comprises:

if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency;

if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal;

and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to a power supply control device, an air conditioner and a power supply control method thereof, in particular to a load-adaptive low-power-consumption control circuit, an air conditioner and a load-adaptive low-power-consumption control method thereof.

Background

Along with the development of the society, the selection of the public on the air conditioner is more specialized, and the selection of the public on the air conditioner not only stays in the field of the cooling and heating effect of the air conditioner, but also gradually considers the power consumption problem of various high-power electrical appliances such as the air conditioner and the like. However, the air conditioner has certain power consumption problem in the operation stage no matter light load or heavy load; in addition, the switching power supply is designed such that switching loss is inevitably generated due to switching of the switching power supply.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The present invention is directed to provide a power supply control device, an air conditioner and a power supply control method thereof, so as to solve the problem of large power consumption of the air conditioner and achieve the effect of reducing the power consumption of the air conditioner.

The present invention provides a power supply control device, including: the control unit, the switch unit and the switch power supply; the control unit is used for determining the current state of the electric appliance and determining the current power supply signal of the electric appliance according to the current state of the electric appliance; the switch unit is used for switching on a control branch of a current power supply signal according to the current power supply signal of the electric appliance; and the switching power supply is used for adjusting the current switching frequency according to the signal for controlling the branch circuit to be switched on of the current power supply signal.

Optionally, the method further comprises: an isolation unit; and the isolation unit is used for carrying out photoelectric isolation on the signal for controlling the switching-on of the branch of the current power supply signal and then transmitting the signal to the control end of the switching power supply.

Optionally, wherein the current state includes: a standby state and an operating state; an operational state comprising: the load power consumption of the first load state is less than that of the second load state; a current power supply signal comprising: any one of the first power signal, the second power signal, and the third power signal; the control unit determines the current power supply signal of the electric appliance according to the current state of the electric appliance, and the method comprises the following steps: if the current state is the standby state, the current power supply signal is a first power supply signal; if the current state is the first load state, the current power supply signal is the second power supply signal; and if the current state is the second load state, the current power supply signal is a third power supply signal.

Optionally, a switching unit comprising: a first switch module, a second switch module and a third switch module; the switching power supply adjusts the current switching frequency according to the signal of the control branch circuit of the current power supply signal, including: if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency; if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal; and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

Optionally, wherein the first switch module comprises: the device comprises a first switch tube, a first starting module, a first current dividing module and a first voltage dividing module; the first power supply signal is connected to the base electrode of the first switching tube through the first starting module, and the collector electrode of the first switching tube is connected to the direct-current power supply after passing through the first voltage division module and the second voltage division module respectively; a second switch module comprising: the second switch tube, the second starting module, the second shunt module and the third shunt module; a second power supply signal is connected to a base electrode of a second switching tube through a second starting module, and a collector electrode of the second switching tube is connected to a common end of the first voltage division module and the first voltage division module through a second shunt module and a third shunt module which are connected in parallel; a third switch module comprising: the third switching tube, the third starting module, the fourth shunting module and the fifth shunting module; and a collector of the third switching tube is connected to a common end of the first voltage division module and the first voltage division module after passing through the fourth voltage division module and the fifth voltage division module which are connected in parallel.

In accordance with another aspect of the present invention, there is provided an air conditioner including: the above-described power supply control device.

In another aspect, the present invention provides a power supply control method for an air conditioner, including: determining the current state of the electric appliance through the control unit, and determining the current power supply signal of the electric appliance according to the current state of the electric appliance; switching on a control branch of a current power supply signal according to the current power supply signal of the electric appliance through a switch unit; and regulating the current switching frequency according to the signal for controlling the branch circuit to be switched on of the current power supply signal through the switching power supply.

Optionally, the method further comprises: and after the signal of the control branch of the current power supply signal is subjected to photoelectric isolation through the isolation unit, the signal is transmitted to the control end of the switching power supply.

Optionally, wherein the current state includes: a standby state and an operating state; an operational state comprising: the load power consumption of the first load state is less than that of the second load state;

a current power supply signal comprising: any one of the first power signal, the second power signal, and the third power signal; determining a current power signal of the electrical appliance according to a current state of the electrical appliance through the control unit, including: if the current state is the standby state, the current power supply signal is a first power supply signal; if the current state is the first load state, the current power supply signal is the second power supply signal; and if the current state is the second load state, the current power supply signal is a third power supply signal.

Optionally, adjusting the current switching frequency according to a signal that controls the branch of the current power signal by the switching power supply includes: if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency; if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal; and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

According to the scheme of the invention, the low-power consumption control of the air conditioner is realized by adjusting the switching frequency of the air conditioner under different load states, so that the serious power consumption loss of the air conditioner in a standby state can be avoided, and the electric energy is saved.

Furthermore, according to the scheme of the invention, the switching frequency of the air conditioner is adjusted under different load states through the low-power-consumption control circuit which is self-adaptive along with the load, so that the low-power-consumption operation of the air conditioner is met.

Furthermore, according to the scheme of the invention, after the air conditioner enters the running working state, the switching frequency is selected by detecting the size of the load, so that the switching power supply can work in the most appropriate and effective frequency range, and the low power consumption is self-adaptive along with the load.

Therefore, according to the scheme of the invention, after the air conditioner enters the operation working state, the switching frequency is selected by detecting the size of the load, so that the switching power supply which continuously changes along with the load is realized, the problem of large power consumption of the air conditioner is solved, and the effect of reducing the power consumption of the air conditioner is achieved.

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

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a power supply control device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a power low-power control circuit in an air conditioner according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a main chip in an air conditioner according to the present invention;

fig. 4 is a flowchart illustrating a power supply control method according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, there is provided a power supply control device. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The power supply control device may include: control unit, switching unit and switching power supply.

Specifically, the control unit may be configured to determine a current state of the electrical appliance, determine a current power signal of the electrical appliance according to the current state of the electrical appliance, and transmit the current power signal of the electrical appliance.

The current state may include: standby state and running state. The operation state can comprise: the load power consumption of the first load state is smaller than that of the second load state. The current power supply signal may include: any one of the first power signal, the second power signal, and the third power signal.

Optionally, the determining, by the control unit, the current power signal of the electrical appliance according to the current state of the electrical appliance may include: if the current state is the standby state, the current power supply signal is a first power supply signal; if the current state is the first load state, the current power supply signal is the second power supply signal; and if the current state is the second load state, the current power supply signal is a third power supply signal.

Therefore, different power supply signals are provided for different states of the electric appliance, different switching frequencies are conveniently provided for different states of the electric appliance, and loss is reduced.

Specifically, the switch unit may be configured to turn on a control branch of the current power signal according to the current power signal of the electrical appliance, and obtain a turn-on signal for turning on the control branch of the current power signal.

Specifically, the switching power supply may be configured to adjust a current switching frequency according to a signal that a control branch of a current power supply signal is turned on, so that the current switching frequency of the switching power supply matches with a current state of the electrical appliance.

For example: a load-adaptive low-power-consumption control circuit can solve the problem of high power consumption loss in the standby state and the operation stage of an air conditioner, meet the low-power-consumption operation of the air conditioner, achieve true low power consumption and save electric energy. If the air conditioner enters the operation working state, the MCU main chip detects the size of the load to select the switching frequency, so that the switching power supply which continuously changes along with the load is achieved, and unnecessary switching consumption is reduced.

Specifically, according to the characteristics of the switching power supply, the load state of the air conditioner is detected by using a main chip of the MCU, different state signals of the air conditioner are fed back to corresponding L OWPOWER1, L OWPOWER2 and L OWPOWER3 when the air conditioner is in the load state, the MCU controls the optical coupling circuit, and the corresponding switching frequency is selected by feeding back to the switching power supply, so that the switching frequency in the same time is reduced, and the problem that the switching loss is serious because the frequency is not changed but only the duty ratio is adjusted under different states of the air conditioner is solved.

Therefore, the switching frequency of the switching power supply of the electric appliance is adjusted according to different states of the electric appliance, and the phenomenon that the switching power supply is frequently started to increase energy consumption is avoided.

Wherein, the switch unit can include: the first switch module, the second switch module and the third switch module.

Optionally, the switching power supply adjusts the current switching frequency according to a signal that the control branch of the current power supply signal is turned on, and may include any one of the following adjustment situations.

The first regulation case: if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency.

For example, when an air conditioning system is powered on, the air conditioning system is in a standby state, signals of a first power supply L OWPOWER1 are fed back to a first triode Q1 through MCU internal logic, the first triode Q1 is controlled to be conducted, signals are fed back to a switching power supply chip U1 through an optocoupler detection circuit U2, the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1 through a control pin C of a switching power supply chip U1, the switching frequency is adjusted to be in the lowest state, and further, when the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1, the switching power supply chip works at the lowest switching frequency, and therefore switching loss is reduced.

The second regulation case: if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal.

For example, when an air conditioner system receives an external power-on instruction, the MCU executes a load output command at the moment, and is in an operating state, when the air conditioner executes control, the power changes along with the load change at the rear end, through the internal logic of the MCU, when the power is detected to be in the threshold range of L OWPOWER2 of the second power supply L OWPOWER2, the signal of the second power supply L OWPOWER2 is fed back to the second triode Q2, the conduction of the second triode Q2 is controlled, the signal is fed back to the switching power supply chip U1 through the optical coupling detection circuit U2, through the control pin C of the switching power supply chip U1, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1, the switching frequency is adjusted to the corresponding threshold state, and the high-efficiency output of the high frequency band of the.

The third regulation case: and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

For example, when the air conditioning system receives an external power-on instruction, the MCU executes a load output command, and is in an operating state, in the operating state, when the air conditioning load is heavy load, and the power is detected to be within the threshold range of the third power supply L OWPOWER3 as above, a signal of the third power supply L OWPOWER3 is fed back to the third triode Q3, the third triode Q3 is controlled to be conducted, the signal is fed back to the switching power supply chip U1 through the optocoupler detection circuit U2, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1 through the control pin C of the switching power supply chip U1, and the switching frequency is adjusted to the threshold state, so that the high-efficiency output of the high frequency band of the switching power supply is met.

Therefore, by arranging the plurality of control branches, the switching frequency of the switching power supply is controlled by different control branches according to different states of the electric appliance, the switching frequency can be adjusted according to the adaptability of the electric appliance to different states, and the phenomenon that the energy consumption is increased due to frequent switching of the switching power supply is avoided.

More optionally, a more specific structure of the switch unit can be seen in the following exemplary description.

Specifically, the first switch module may include: the device comprises a first switch tube, a first starting module, a first current dividing module and a first voltage dividing module. The first power supply signal is connected to the base electrode of the first switch tube through the first starting module, the collector electrode of the first switch tube is connected to the direct-current power supply after passing through the first voltage division module and the second voltage division module respectively, and the emitting electrode of the first switch tube is grounded. For example: a first switch, such as a first transistor Q1. The first enabling module may be a base resistor R1. The first shunting module may be a resistor R8. The first voltage dividing module may be a resistor R9.

Specifically, the second switch module may include: the second switch tube, the second starting module, the second shunt module and the third shunt module. The second power supply signal is connected to the base electrode of the second switch tube through the second starting module, the collector electrode of the second switch tube is connected to the common end of the first voltage division module and the first voltage division module through the second voltage division module and the third voltage division module which are connected in parallel, and the emitting electrode of the second switch tube is grounded. For example: and a second switching tube, such as a second transistor Q2. A second enabling module, such as a base resistor R2. A second shunt module, such as resistor R6. A third shunt module, such as resistor R7.

Specifically, the third switching module may include: the third switch tube, the third starting module, the fourth shunting module and the fifth shunting module. The third power supply signal is connected to the base electrode of the third switching tube through the third starting module, the collector electrode of the third switching tube is connected to the common end of the first voltage division module and the first voltage division module through the fourth voltage division module and the fifth voltage division module which are connected in parallel, and the emitter electrode of the third switching tube is grounded. For example: and a third transistor, such as a third transistor Q3. A third enabling block, such as base resistor R3. A fourth shunting module, such as resistor R4. A fourth shunting module, such as resistor R5.

For example: and transistors Q1, Q2 and Q3, which are used as frequency switching control switches. Base resistors R1, R2, and R3 may be used to provide a base current for transistor turn-on. The resistors R4, R5, R6, R7, and R8, as pull-up shunt resistors, may be used to adjust the magnitude of the feedback current according to the load adjustment frequency. And the main chip controls the signal of the corresponding triode switch according to the power supply signal which is output by the load and is related to the frequency threshold.

Therefore, the switch tube is used as the switch unit, the structure is simple, and the control reliability is good.

In an alternative embodiment, the method may further include: and an isolation unit. For example: the isolation unit can be a photoelectric coupler.

Specifically, the isolation unit may be configured to perform photoelectric isolation on a signal that is switched on by a control branch of the current power signal, and transmit the signal to a control end of the switching power supply. The control terminal of the switching power supply, for example, the control pin C of the switching power supply chip U1.

For example, according to the control circuit of the load adjusting switching frequency, the control circuit composed of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the resistors R1 to R8, according to the weight of the load, the main chip outputs a control signal to turn on different triodes QX (i.e. the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3), and the control signal is fed back to the frequency control pin of the switching power supply through the optical coupler, so that the switching frequency is adaptively adjusted according to the load, and the switching loss is reduced.

Therefore, the signal which controls the opening of the branch of the current power supply signal is subjected to photoelectric isolation and then transmitted through the isolation unit, and the accuracy of receiving the signal by the switching power supply is improved.

Through a large number of tests, the technical scheme of the invention is adopted to realize low-power consumption control of the air conditioner by adjusting the switching frequency of the air conditioner under different load states, so that the serious power consumption loss of the air conditioner in a standby state can be avoided, and the electric energy is saved.

According to the embodiment of the invention, an air conditioner corresponding to the power supply control device is also provided. The air conditioner may include: the above-described power supply control device.

In the operation process of the unit, the switching power supply adjusts the output of the rear end through a feedback loop to achieve a balance state. Some air conditioner controllers adopt a fixed frequency switch due to design problems, the switching frequency cannot be self-adjusted according to the load, and only the duty ratio is adjusted. The switching process with fixed frequency generates large loss.

The problem of large power consumption loss in the standby state and the operation stage of the air conditioner is considered. The scheme of the invention provides a low-power-consumption control circuit adaptive to a load, and the low-power-consumption operation of an air conditioner is met. By using the power supply low-power consumption control circuit, the real low power consumption can be achieved, and the electric energy is saved; the market competitiveness of the low-power-consumption air conditioner is improved.

Some switching power supply schemes implement the switching state of the switching power supply by adjusting the duty ratio of the switch; according to the load requirement, the duty ratio can be continuously adjusted, namely the switching power supply is switched on and off continuously, so that energy is stored for the rear-end winding. When the air conditioning system is in a light load state, the switching of the fixed frequency inevitably causes frequent switching waste. The scheme of the invention provides a power supply low-power consumption control circuit adaptive to a load, which comprises the following steps: the control circuits such as the MCU, the optocoupler detection, the triode control and the like realize that the air conditioner adjusts the switching frequency under different load states to achieve low power consumption control of the air conditioner, so that the serious power consumption loss of the air conditioner in a standby state can be avoided, and the electric energy is saved; the market competitiveness of the low-power-consumption air conditioner is improved.

Fig. 2 can show a schematic diagram of the power supply low power consumption control circuit.

As shown in fig. 2, after the air conditioner enters the operation state, the MCU main chip detects the load size to select the switching frequency, so as to achieve a switching power supply that varies with the load, thereby reducing unnecessary switching power consumption. In fig. 2, the floating winding of the transformer is the other load circuit.

As shown in fig. 2, a control circuit for adjusting the switching frequency according to the load is provided on the hardware, and the control circuit is composed of a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and resistors R1-R8, and according to the weight of the load, the main chip outputs a control signal to turn on different triodes QX (i.e., the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3), and feeds the control signal back to the frequency control pin of the switching power supply through optical coupling feedback, so that the switching frequency is adaptively adjusted according to the load, and the switching loss is reduced.

In fig. 2, a rectifier bridge DB1 may be used for rectification, a switching power supply chip U1 may be used for power supply, a bus capacitor C83 may be used for filtering, a resistor R15 and a resistor R16 may be used for resistance voltage division and current limiting setting, a resistor RCD may be used for absorbing leakage inductance energy, a transformer L may be used for energy conversion, an optocoupler U2 may be used for isolation feedback, a diode D2 may be used for rectification, a resistor R13 may be used as a pull-up resistor, a resistor R11 and a resistor R12 may be used as a current limiting resistor, a resistor R9 and a resistor R10 may be used for voltage division and setting of an output voltage, transistors Q1, Q2 and Q3 may be used as a frequency switching control switch, base resistors R1, R2 and R3 may be used for providing a base current for switching on of the transistors, and resistors R4, R5, R6, R7 and R8 may be used as a pull-up shunt resistors for adjusting the magnitude of a feedback current according to.

Fig. 3 may show a schematic block diagram of a main chip.

The three power signals in fig. 3 are power signals related to a frequency threshold value output by the main chip according to the magnitude of the load, and control signals of the corresponding triode switch in fig. 2.

Specifically, according to the characteristics of the switching power supply, the load state of the air conditioner can be detected by using the MCU main chip, different state signals of the air conditioner are fed back to corresponding L OWPOWER1, L OWPOWER2 and L OWPOWER3 when the air conditioner is in the load state, the MCU controls the optocoupler circuit and feeds back to the switching power supply to select corresponding switching frequency, so that the switching frequency in the same time is reduced, and the problem that the switching loss is serious because the frequency is not changed but only the duty ratio is adjusted under different states of the air conditioner is solved.

Optionally, when the air conditioning system is powered on, the air conditioning system is in a standby state, signals of a first power supply L OWPOWER1 are fed back to a first triode Q1 through MCU internal logic, the first triode Q1 is controlled to be conducted, signals are fed back to a switching power supply chip U1 through an optocoupler detection circuit U2, the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1 through a control pin C of a switching power supply chip U1, the switching frequency is adjusted to be in the lowest state, and further, when the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1, the switching power supply chip works at the lowest switching frequency, and therefore switching loss is reduced.

Optionally, when the air conditioning system receives an external power-on instruction, the MCU executes the load output command, which is in an operating state.

In the operating state, when the air conditioner executes control, the power changes along with the load change of the rear end, when the power is detected to be within the threshold range of the second power supply L OWPOWER2 through the internal logic of the MCU, the signal of the second power supply L OWPOWER2 is fed back to the second triode Q2, the conduction of the second triode Q2 is controlled, the signal is fed back to the switching power supply chip U1 through the optical coupling detection circuit U2, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1 through the control pin C of the switching power supply chip U1, the switching frequency is adjusted to the corresponding threshold state, and therefore the high-efficiency output of the high-frequency band of the switching power supply is met.

In an operating state, when the air conditioner load is heavy, and as above, when it is detected that the power is within the threshold range of the third power supply L OWPOWER3, a signal of the third power supply L OWPOWER3 is fed back to the third triode Q3, the third triode Q3 is controlled to be turned on, the signal is fed back to the switching power supply chip U1 through the optical coupling detection circuit U2, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1 through the control pin C of the switching power supply chip U1, and the switching frequency is adjusted to a threshold state, so that high-efficiency output of a high-frequency band of the switching power supply is met.

In this way, when the standby state is entered again, the signal of the first power supply L OWPOWER1 is fed back to the first transistor Q1 continuously through the MCU internal logic.

It can be seen that by using the principle of a switching power supply, t is 1/f, and in the same time period t, the switching frequency f is larger, the switching times are more, and the switching loss of the air conditioner is larger; and the MCU executes related actions through external instruction information, so that the switching power supply works in the most appropriate and effective frequency band, and the purpose of self-adapting with the load and low power consumption is achieved.

Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 1, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention is adopted, and the switching frequency of the air conditioner is adjusted under different load states through the low-power-consumption control circuit which is self-adaptive along with the load, so that the low-power-consumption operation of the air conditioner is met.

According to an embodiment of the present invention, there is also provided a power supply control method for an air conditioner corresponding to the air conditioner, as shown in fig. 4, which is a schematic flow chart of an embodiment of the method of the present invention. The power supply control method of the air conditioner may include steps S110 to S130.

At step S110, determining, by the control unit, a current state of the appliance, and determining a current power signal of the appliance according to the current state of the appliance, and transmitting the current power signal of the appliance.

The current state may include: standby state and running state. The operation state can comprise: the load power consumption of the first load state is smaller than that of the second load state. The current power supply signal may include: any one of the first power signal, the second power signal, and the third power signal.

Optionally, the determining, by the control unit, the current power signal of the electrical appliance according to the current state of the electrical appliance in step S110 may include: if the current state is the standby state, the current power supply signal is a first power supply signal; if the current state is the first load state, the current power supply signal is the second power supply signal; and if the current state is the second load state, the current power supply signal is a third power supply signal.

Therefore, different power supply signals are provided for different states of the electric appliance, different switching frequencies are conveniently provided for different states of the electric appliance, and loss is reduced.

In step S120, according to the current power signal of the electrical appliance, the control branch of the current power signal is turned on through the switch unit, and a turn-on signal for turning on the control branch of the current power signal is obtained.

At step S130, the current switching frequency is adjusted by the switching power supply according to the signal that the control branch of the current power supply signal is turned on, so that the current switching frequency of the switching power supply matches the current state of the electrical appliance.

For example: a load-adaptive low-power-consumption control circuit can solve the problem of high power consumption loss in the standby state and the operation stage of an air conditioner, meet the low-power-consumption operation of the air conditioner, achieve true low power consumption and save electric energy. If the air conditioner enters the operation working state, the MCU main chip detects the size of the load to select the switching frequency, so that the switching power supply which continuously changes along with the load is achieved, and unnecessary switching consumption is reduced.

Specifically, according to the characteristics of the switching power supply, the load state of the air conditioner is detected by using a main chip of the MCU, different state signals of the air conditioner are fed back to corresponding L OWPOWER1, L OWPOWER2 and L OWPOWER3 when the air conditioner is in the load state, the MCU controls the optical coupling circuit, and the corresponding switching frequency is selected by feeding back to the switching power supply, so that the switching frequency in the same time is reduced, and the problem that the switching loss is serious because the frequency is not changed but only the duty ratio is adjusted under different states of the air conditioner is solved.

Therefore, the switching frequency of the switching power supply of the electric appliance is adjusted according to different states of the electric appliance, and the phenomenon that the switching power supply is frequently started to increase energy consumption is avoided.

Optionally, the current switching frequency is adjusted by the switching power supply according to the signal that the control branch of the current power supply signal is turned on in step S130, which may include any one of the following adjustment situations.

The first regulation case: if the current state is the standby state, the frequency end of the switching power supply is connected with the source electrode of the switching power supply through the control end of the switching power supply so as to adjust the switching frequency of the switching power supply to the set lowest frequency.

For example, when an air conditioning system is powered on, the air conditioning system is in a standby state, signals of a first power supply L OWPOWER1 are fed back to a first triode Q1 through MCU internal logic, the first triode Q1 is controlled to be conducted, signals are fed back to a switching power supply chip U1 through an optocoupler detection circuit U2, the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1 through a control pin C of a switching power supply chip U1, the switching frequency is adjusted to be in the lowest state, and further, when the frequency pin F of the switching power supply chip U1 is connected with the source electrode S of the switching power supply chip U1, the switching power supply chip works at the lowest switching frequency, and therefore switching loss is reduced.

The second regulation case: if the current state is the first load state, the control end of the switching power supply is connected with the frequency end of the switching unit, and the current frequency of the switching power supply is adjusted to be within a first switching frequency threshold range matched with the second power supply signal.

For example, when an air conditioner system receives an external power-on instruction, the MCU executes a load output command at the moment, and is in an operating state, when the air conditioner executes control, the power changes along with the load change at the rear end, through the internal logic of the MCU, when the power is detected to be in the threshold range of L OWPOWER2 of the second power supply L OWPOWER2, the signal of the second power supply L OWPOWER2 is fed back to the second triode Q2, the conduction of the second triode Q2 is controlled, the signal is fed back to the switching power supply chip U1 through the optical coupling detection circuit U2, through the control pin C of the switching power supply chip U1, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1, the switching frequency is adjusted to the corresponding threshold state, and the high-efficiency output of the high frequency band of the.

The third regulation case: and if the current state is the second load state, switching on the control end of the switching power supply and the frequency end of the switching unit, and adjusting the current frequency of the switching power supply to be within a second switching frequency threshold range matched with the third power supply signal.

For example, when the air conditioning system receives an external power-on instruction, the MCU executes a load output command, and is in an operating state, in the operating state, when the air conditioning load is heavy load, and the power is detected to be within the threshold range of the third power supply L OWPOWER3 as above, a signal of the third power supply L OWPOWER3 is fed back to the third triode Q3, the third triode Q3 is controlled to be conducted, the signal is fed back to the switching power supply chip U1 through the optocoupler detection circuit U2, the control pin C of the switching power supply chip U1 is connected with the frequency pin F of the switching power supply chip U1 through the control pin C of the switching power supply chip U1, and the switching frequency is adjusted to the threshold state, so that the high-efficiency output of the high frequency band of the switching power supply is met.

Therefore, by arranging the plurality of control branches, the switching frequency of the switching power supply is controlled by different control branches according to different states of the electric appliance, the switching frequency can be adjusted according to the adaptability of the electric appliance to different states, and the phenomenon that the energy consumption is increased due to frequent switching of the switching power supply is avoided.

In an alternative embodiment, the method may further include: and after the signal of the control branch of the current power supply signal is subjected to photoelectric isolation through the isolation unit, the signal is transmitted to the control end of the switching power supply. The control terminal of the switching power supply, for example, the control pin C of the switching power supply chip U1.

For example, according to the control circuit of the load adjusting switching frequency, the control circuit composed of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the resistors R1 to R8, according to the weight of the load, the main chip outputs a control signal to turn on different triodes QX (i.e. the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3), and the control signal is fed back to the frequency control pin of the switching power supply through the optical coupler, so that the switching frequency is adaptively adjusted according to the load, and the switching loss is reduced.

Therefore, the signal which controls the opening of the branch of the current power supply signal is subjected to photoelectric isolation and then transmitted through the isolation unit, and the accuracy of receiving the signal by the switching power supply is improved.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the air conditioner, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

After a large number of tests prove that by adopting the technical scheme of the embodiment, after the air conditioner enters the running working state, the switching frequency is selected by detecting the size of the load, so that the switching power supply can work in the most appropriate and effective frequency section and is self-adaptive with the load, and the low power consumption is realized.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.