WO2020181770A1

WO2020181770A1 - Household appliance control method, and household appliance

Info

Publication number: WO2020181770A1
Application number: PCT/CN2019/112326
Authority: WO
Inventors: 梁敏游
Original assignee: 广东美的制冷设备有限公司
Priority date: 2019-03-11
Filing date: 2019-10-21
Publication date: 2020-09-17
Also published as: CN110021937A; CN110021937B

Abstract

A household appliance (100) control method, and a household appliance (100). The control method comprises: obtaining a running frequency of a load (104) of a household appliance (100) and impedance of a power supply circuit (102) connected to the household appliance (100) to supply power to the load (104) (S1); and if the running frequency is less than a first preset frequency and the impedance of the connected power supply circuit (102) is greater than preset impedance, reducing the impedance of the connected power supply circuit (102) (S2). In the case that the running frequency of the load (104) of the household appliance (100) is less than the first preset frequency and the impedance of the connected power supply circuit (102) is greater than the preset impedance, the control method can reduce the impedance of the connected power supply circuit (102), so as to reduce power consumed on an impedance element (106). On one hand, the overall power consumption of the household appliance (100) can be reduced, and on the other hand, the normal running of the household appliance (100) would not be affected.

Description

Method for controlling household appliances and household appliances

Cross references to related applications

This disclosure is based on a Chinese patent application with an application number of 201910179166.7 and an application date of March 11, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this disclosure.

Technical field

The present disclosure relates to the technical field of electrical appliances, in particular to a control method of household appliances and household appliances.

Background technique

At present, household appliances, such as outdoor units of air conditioners, will use passive PFC (Power Factor Correction) or active PFC circuits due to harmonics or EMC (Electro Magnetic Compatibility) requirements. Generally, PFC circuits are used in PFC circuits. Electrical components such as inductors or reactors are installed. When current is generated in the circuit, the inductor or reactor will consume a certain amount of power, and the greater the current, the greater the power consumed. However, in a high-efficiency air-conditioning system, it is necessary to make each power-consuming device work in the minimum power state as much as possible. Since the inductance or reactor has been installed on the machine, the power consumption is only related to the current flowing through the whole machine. There is a relationship, the power cannot be reduced by other means, which causes the power consumption of the electrical system to increase, and when the electrical appliance is running at low frequency, the power of the impedance element in the electrical circuit cannot be effectively reduced to reduce the power consumption.

Summary of the invention

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, the first purpose of the present disclosure is to propose a control method for household appliances, which can be used when the operating frequency of the load of the household appliance is less than the first preset frequency and the impedance of the power supply circuit is greater than the preset impedance. In the case of, it can reduce the impedance of the power supply circuit, so that the power consumed on the impedance element can be reduced. On the one hand, it can reduce the overall power consumption of the household appliance. On the other hand, it will not affect the normal operation of the household appliance. influences.

The second purpose of the present disclosure is to propose a household appliance.

To achieve the above objective, the first aspect of the present disclosure provides a method for controlling household appliances, including: obtaining the operating frequency of the load of the household appliance and connecting to a power supply circuit for the household appliance to supply power to the load The impedance; the operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit is greater than the preset impedance, reducing the impedance connected to the power supply circuit.

According to the control method of the home appliance of the embodiment of the present disclosure, when the operating frequency of the load of the home appliance is less than the first preset frequency and the impedance of the power supply circuit is greater than the preset impedance, the impedance of the power supply circuit can be reduced , To reduce the power consumed on the impedance element, on the one hand, it can reduce the overall power consumption of the household appliance, on the other hand, it will not affect the normal operation of the household appliance.

In addition, the method for controlling household appliances proposed according to the foregoing embodiments of the present disclosure may also have the following additional technical features:

According to an embodiment of the present disclosure, the power supply circuit includes a plurality of impedance elements connected in series to reduce the impedance connected to the power supply circuit, including: short-circuiting one or more of the plurality of impedance elements to reduce access The impedance of the power supply circuit.

According to an embodiment of the present disclosure, at least one or more of the plurality of impedance elements are connected in parallel with a switching element, and short-circuiting one or more of the plurality of impedance elements includes: controlling the switching element to close to short One or more of the multiple impedance elements are connected.

According to an embodiment of the present disclosure, the switch element is a holding switch element, the switch element is connected with a switch circuit, and the control method includes: controlling a first control signal and a second control input to the switch circuit The level of the signal controls the working state of the switch, and the working state includes closed and open.

According to an embodiment of the present disclosure, the control method includes: outputting the first control signal of a high level for a preset period of time and continuously outputting the second control signal of a low level to close the switch; Continuously outputting the first control signal of low level and the second control signal of outputting high level for the preset period of time, turning off the switch element.

According to an embodiment of the present disclosure, the control method includes: maintaining access when the operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance. The impedance of the power supply circuit remains unchanged.

According to an embodiment of the present disclosure, the control method includes: keeping the power supply connected when the operating frequency is greater than a second preset frequency and the impedance connected to the power supply circuit is greater than the preset impedance The impedance of the circuit remains unchanged; when the operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance, the impedance connected to the power supply circuit is increased, wherein , The second preset frequency is greater than the first preset frequency.

According to an embodiment of the present disclosure, the control method includes: when the operating frequency is not less than the first preset frequency and not greater than the second preset frequency, maintaining access to the power supply circuit The impedance is unchanged.

According to an embodiment of the present disclosure, the power supply circuit includes a power supply circuit and a storage circuit, and the control method includes: controlling the power supply circuit to store energy for the impedance element through the storage circuit; controlling the power supply circuit The impedance element after energy storage provides power to the load.

According to one embodiment of the present disclosure, controlling the power supply circuit to store energy for the impedance element through the energy storage circuit includes: turning on a switching transistor of the energy storage circuit so that the power supply circuit passes through the energy storage The circuit stores energy for the impedance element; controlling the power supply circuit and the impedance element after energy storage to supply power to the load includes: turning off the switching transistor of the energy storage circuit so that the power supply circuit and the stored energy The impedance element provides power to the load.

In order to achieve the above objective, the second aspect of the implementation of the present disclosure proposes a household appliance, which includes a control device, a power supply circuit, and a load, the control device is connected to the power supply circuit and the load, and the power supply circuit is used for The load is supplied with power, and the control device is used to obtain the operating frequency of the load and the impedance connected to the power supply circuit, and to obtain the power supply circuit when the operating frequency is lower than the first preset frequency. When the impedance is greater than the preset impedance, the impedance connected to the power supply circuit is reduced.

According to the home appliance of the embodiment of the present disclosure, when the operating frequency of the load of the home appliance is less than the first preset frequency and the impedance of the power supply circuit is greater than the preset impedance, the impedance of the power supply circuit can be reduced, so that the consumption The power reduction on the impedance element can reduce the overall power consumption of the household appliance on the one hand, and on the other hand, it will not affect the normal operation of the household appliance.

In addition, the household appliances proposed according to the above embodiments of the present disclosure may also have the following additional technical features:

According to an embodiment of the present disclosure, the power supply circuit includes a plurality of impedance elements connected in series, and the control device is used to short-circuit one or several of the plurality of impedance elements to reduce the impedance connected to the power supply circuit .

According to an embodiment of the present disclosure, at least one or several of the plurality of impedance elements are connected in parallel with a switching element, and the control device is used to control the switching element to close to short-circuit one or one of the plurality of impedance elements. several.

According to an embodiment of the present disclosure, the switch element is a holding switch element, the switch element is connected with a switch circuit, and the control device is used to control the first control signal and the second control input to the switch circuit The level of the signal controls the working state of the switch, and the working state includes closed and open.

According to an embodiment of the present disclosure, the control device is used to control the output of the first control signal of a high level for a preset period of time and continuously output the second control signal of a low level to close the switch element , And used for continuously outputting the first control signal of low level and the second control signal of outputting high level for the preset period of time to turn off the switch.

According to an embodiment of the present disclosure, the control device is configured to maintain access when the operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance. The impedance of the power supply circuit remains unchanged.

According to an embodiment of the present disclosure, the control device is configured to keep the power supply connected when the operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit is greater than the preset impedance The impedance of the circuit remains unchanged, and when the operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance, the power supply circuit is increased Impedance, wherein the second preset frequency is greater than the first preset frequency.

According to an embodiment of the present disclosure, the control device is configured to keep the power supply circuit connected to the power supply circuit when the operating frequency is not less than the first preset frequency and not greater than the second preset frequency. The impedance is unchanged.

According to an embodiment of the present disclosure, the power supply circuit includes a power supply circuit and an energy storage circuit, and the control device is used for controlling the power supply circuit to store energy for the impedance element through the energy storage circuit, and for controlling the The power supply circuit and the impedance element after energy storage provide power to the load.

According to an embodiment of the present disclosure, the control device is used to turn on the switching transistor of the tank circuit so that the power supply circuit stores energy for the impedance element through the tank circuit, and is used to turn off the The switching transistor of the energy storage circuit enables the power supply circuit and the impedance element after energy storage to supply power to the load.

The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a schematic flowchart of a control method of a household appliance according to an embodiment of the present disclosure;

Fig. 2 is a schematic diagram of modules of a household appliance according to an embodiment of the present disclosure;

FIG. 3 is another schematic flow chart of the control method of the household appliance according to the embodiment of the present disclosure;

Figure 4 is a schematic diagram of a circuit of a household appliance in the related art;

FIG. 5 is another schematic flowchart of the control method of the household appliance according to the embodiment of the present disclosure;

FIG. 6 is another schematic flowchart of the control method of the household appliance according to the embodiment of the present disclosure;

FIG. 7 is another flowchart of the control method of the household appliance according to the embodiment of the present disclosure;

Fig. 8 is a schematic circuit diagram of a household appliance according to an embodiment of the present disclosure;

9 is a schematic diagram of another circuit of the household appliance according to the embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another module of the household appliance according to the embodiment of the present disclosure;

FIG. 11 is a schematic diagram of another module of the household appliance according to the embodiment of the present disclosure;

FIG. 12 is a schematic diagram of the principle of the power supply circuit of the household appliance according to the embodiment of the present disclosure in operation;

FIG. 13 is another schematic diagram of the principle of the power supply circuit of the household appliance according to the embodiment of the present disclosure during operation;

FIG. 14 is a schematic diagram of waveforms of a power supply circuit of a household appliance according to an embodiment of the present disclosure.

Symbol description of main components:

Power supply circuit 102, load 104, impedance element 106, control device 108, switch 110, energy storage circuit 112, power supply circuit 114, switch circuit 116, impedance element 200, control chip 124, first control terminal 125, and second control terminal 126, control terminal 128, power supply 400, first reactor L1, second reactor L2, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, magnetic latching relay RY1, Switch transistor Q1.

detailed description

The following describes the embodiments of the present disclosure in detail, and the embodiments of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.

In the description of the embodiments of the present disclosure, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

In the description of the embodiments of the present disclosure, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they can be fixed connection or It is a detachable connection or an integral connection; it can be a mechanical connection, or it can be an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or two components The interaction relationship. For those of ordinary skill in the art, the specific meanings of the aforementioned terms in the embodiments of the present disclosure can be understood according to specific situations.

In the embodiments of the present disclosure, unless expressly stipulated and defined otherwise, the "on" or "under" of the first feature of the second feature may include direct contact between the first and second features, or include the first and The second feature is not in direct contact but through another feature between them.

The following disclosure provides many different embodiments or examples for realizing different structures of the embodiments of the present disclosure. In order to simplify the disclosure of the embodiments of the present disclosure, components and settings of specific examples are described below. Of course, they are only examples, and are not intended to limit the present disclosure. In addition, the embodiments of the present disclosure may repeat reference numbers and/or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and/or settings discussed. .

Please refer to FIG. 1 and FIG. 2, an embodiment of the present disclosure provides a control method of a household appliance 100. The home appliance 100 includes a power supply circuit 102 and a load 104. The power supply circuit 102 is connected to the load 104 and supplies power to the load 104.

Referring to FIG. 1, the control method of the household appliance 100 according to the embodiment of the present disclosure includes:

Step S1, obtaining the operating frequency of the load 104 and the impedance of the power supply circuit 102 connected to it;

Step S2, when the operating frequency is less than the first preset frequency and the impedance of the power supply circuit 102 is greater than the preset impedance, the impedance of the power supply circuit 102 is reduced.

The control method of the household appliance 100 of the embodiment of the present disclosure may be implemented by the household appliance 100 of the embodiment. Specifically, referring to Figure 2, the household appliance 100 includes a control device 108, a power supply circuit 102, and a load 104. The control device 108 is connected to the power supply circuit 102 and the load 104. The power supply circuit 102 is used to supply power to the load 104, and the control device 108 is used to obtain the load. The operating frequency of 104 and the impedance of the power supply circuit 102 are used to reduce the impedance of the power supply circuit 102 when the operating frequency is less than the first preset frequency and the impedance of the power supply circuit 102 is greater than the preset impedance.

In the above-mentioned control method of the household appliance 100 and the household appliance 100, when the operating frequency of the load 104 of the household appliance 100 is less than the first preset frequency and the impedance connected to the power supply circuit 102 is greater than the preset impedance, the access can be reduced. The impedance of the power supply circuit 102 reduces the power consumed on the impedance element 106. On the one hand, it can reduce the overall power consumption of the household appliance 100, and on the other hand, it will not affect the normal operation of the household appliance 100.

Please refer to Figure 3. Specifically, step S2 includes:

Step S20, judging whether the operating frequency is less than the first preset frequency;

Step S30, in the case that the operating frequency is less than the first preset frequency, determine whether the impedance of the power supply circuit 102 is greater than the preset impedance;

Step S40, when the impedance of the power supply circuit 102 is greater than the preset impedance, the impedance of the power supply circuit 102 is reduced.

The control method of the household appliance 100 of the embodiment of the present disclosure may be implemented by the household appliance 100 of the embodiment. Specifically, referring to FIG. 2, the control device 108 is used to obtain the operating frequency of the load 104, to determine whether the operating frequency is less than the first preset frequency, and to, when the operating frequency is less than the first preset frequency, It is determined whether the impedance of the access power supply circuit 102 is greater than the preset impedance, and is used to reduce the impedance of the access power supply circuit 102 when the impedance of the access power supply circuit 102 is greater than the preset impedance.

It can be understood that in other embodiments, the relationship between the impedance of the power supply circuit 102 and the preset impedance may be determined first, and then the relationship between the operating frequency and the first preset frequency may be determined, or the impedance of the power supply circuit 102 may be determined at the same time. The relationship with the preset impedance, and the relationship between the operating frequency and the first preset frequency. There is no specific limitation here. In addition, the order of collecting the operating frequency of the load 104 and the impedance of the power supply circuit 102 is not specifically limited. In another embodiment, the operating frequency of the load 104 may be collected first, and then the relationship between the operating frequency of the load 104 and the first preset frequency may be determined, and then the impedance of the power supply circuit 102 may be collected, and then the power supply may be determined. The relationship between the impedance of the circuit 102 and the preset impedance, etc. These embodiments are all within the protection scope of the present disclosure.

Specifically, the household appliance 100 includes but is not limited to air conditioners, refrigerators, washing appliances, microwave cooking equipment, etc. Correspondingly, the load 104 includes, but is not limited to, compressors, pumps, frequency converters, magnetrons, and the like. The control device 108 can control the load 104 to operate at different frequencies. In the embodiment of the present disclosure, the household appliance 100 is an inverter air conditioner, and the load 104 is a compressor. This embodiment is only described in detail. The present disclosure includes but is not limited to only applying this embodiment.

It can be understood that in related technologies, due to harmonics or EMC requirements, home appliances may use passive PFC circuits or active PFC circuits. Please refer to Figure 4, in a passive PFC circuit, a larger impedance element 200 (inductance or reactor) is generally connected to provide the required harmonics in the circuit. The power consumed by the impedance element 200 in the circuit is P=I^2*R, where I is the current, R is the resistance, and P is the power. From this formula, it can be seen that the impedance of the power supply circuit can be reduced by reducing the impedance of the impedance element 200 connected to the power supply circuit. In addition, the control method of the embodiment of the present disclosure can be applied to passive PFC circuits and active PFC circuits.

It can be seen from the above that, in the embodiment of the present disclosure, the power consumed by the impedance element 106 is proportional to the square of the current flowing through the impedance element 106, and also proportional to the resistance of the impedance element 106. The greater the resistance, the greater the power consumed by the impedance element 106. In the energy-efficient household appliance 100, it is necessary to make each power-consuming device work in a low-power state as much as possible to reduce the overall power consumption of the whole machine. Therefore, the overall power consumption of the whole machine can be reduced by reducing the impedance of the access power supply circuit 102. It can be understood that the operating frequency of the load 104 is controlled by the control device 108 according to the operating conditions of the household appliance 100. For air conditioners, the working conditions of the air conditioner include various operating modes, including but not limited to cooling mode, heating mode, dehumidification mode, ventilation mode, energy saving mode, sleep mode, etc. The selection of the operating mode may be an automatic selection of the air conditioner, or may be selected according to an input instruction of the user, which is not specifically limited here.

In step S1, the operating frequency of the load 104 is acquired. In this embodiment, the operating frequency of the compressor is acquired.

Generally, when the compressor is running at a higher frequency, the power of the whole household appliance 100 is larger, and the power drop caused by reducing the impedance of the power supply circuit 102 is small for the whole machine (basically can be ignored Excluding), it is of little significance to improve the energy efficiency ratio of the whole machine. At the same time, the current in the high frequency stage is large, and reducing the impedance may have a great impact on the harmonics and power factor. Therefore, when the operating frequency of the load is less than the first preset frequency and the impedance of the power supply circuit is greater than the preset impedance, the impedance of the power supply circuit 102 is reduced. In this way, the way to reduce power consumption is to use it when the compressor is running at low frequency, so that it has little effect on harmonics and power factor.

The preset impedance is R0, the impedance set when the load is running at lower frequency is R1, the impedance set when the load is running at higher frequency is R2, and the current impedance connected to the power supply circuit 102 is RT, where R2> R1. The setting of R0 can be set according to actual conditions. In an example, R0=R1, when the operating frequency is less than the first preset frequency and RT>R0, the impedance of the power supply circuit 102 is reduced, so that the current impedance of the power supply circuit 102 after the reduction is RT=R1 or RT<R1.

In another example, R1<R0<R2, when the operating frequency is less than the first preset frequency and RT>R0, the impedance of the power supply circuit 102 is reduced, so that the current impedance RT of the power supply circuit 102 after the reduction is reduced =R1 or RT<R1 or R1<RT<R0.

In the embodiments of the present disclosure, the lower frequency or low frequency may be a frequency less than the first preset frequency, and the higher frequency or high frequency may be a frequency not less than the first preset frequency. It should be noted that during the initial operation of the household appliance 100, the load generally runs at a higher operating frequency. In this case, the impedance of the access power supply circuit 102 is also relatively large to ensure that the requirements of harmonics and power factor are met. After the home appliance 100 runs for a period of time, the load 104 may run at a low frequency to reduce power consumption. Therefore, when the operating frequency of the load is less than the first preset frequency, the impedance of the power supply circuit 102 is reduced to reduce power consumption, and at the same time, the influence on harmonics and power factor is also within an acceptable range.

Please refer to Figure 5. In some embodiments, the control method includes:

Step S3, when the operating frequency is less than the first preset frequency and the impedance of the power supply circuit 102 is not greater than the preset impedance, the impedance of the power supply circuit 102 is kept unchanged.

Specifically, step S3 can be implemented by the household appliance 100 of the embodiment of the present disclosure, that is, the control device 108 is configured to operate when the operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit 102 is not greater than the preset impedance In the case of, keep the impedance of the power supply circuit 102 connected to it.

In this way, it can be ensured that when the load is running at a lower frequency, the low power consumption state of the power supply circuit 102 is maintained, and the influence on the characteristic requirements of the circuit, such as the influence on harmonics and power factor, is also within an acceptable range.

Referring to FIG. 6, in some embodiments, the control method includes:

Step S4, when the operating frequency is greater than the second preset frequency and the impedance of the power supply circuit 102 is greater than the preset impedance, the impedance of the power supply circuit 102 is kept unchanged.

Step S5, when the operating frequency is greater than the second preset frequency and the impedance of the power supply circuit 102 is not greater than the preset impedance, the impedance of the power supply circuit 102 is increased.

Wherein, the second preset frequency is greater than the first preset frequency.

Specifically, the above-mentioned steps can be implemented by the household appliance 100 of the embodiment of the present disclosure, that is, the control device 108 is used in the case where the operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit 102 is greater than the preset impedance , Keeping the impedance of the power supply circuit 102 connected, and used to increase the impedance of the power supply circuit 102 when the operating frequency is greater than the second preset frequency and the impedance of the power supply circuit 102 is not greater than the preset impedance .

In this way, when the operating frequency of the load is relatively high, the power supply circuit 102 can be operated with a relatively high impedance to meet the circuit characteristic requirements of the household appliance 100, such as the requirements of harmonics and power factor.

Specifically, after the load 104 operates at a low frequency for a period of time, according to the operating conditions of the household appliance 100 or other control commands, the load 104 may operate at a higher frequency again. At this time, to ensure that the circuit characteristic requirements such as harmonics and For power factor requirements, the power supply circuit 102 needs to operate with a larger impedance. Therefore, when the operating frequency is greater than the second preset frequency and the impedance of the power supply circuit 102 is greater than the preset impedance, the impedance of the power supply circuit 102 is kept unchanged, and when the operating frequency is greater than the second preset frequency and the impedance If the impedance of the power supply circuit 102 is not greater than the preset impedance, the impedance of the power supply circuit 102 is increased. Specifically, the impedance of the power supply circuit 102 can be increased by increasing the impedance of the impedance element 106 connected to the power supply circuit 102.

Please refer to FIG. 7. In some embodiments, the control method includes:

Step S6: When the operating frequency is not less than the first preset frequency and not greater than the second preset frequency, the impedance of the power supply circuit 102 is kept unchanged.

Specifically, the above steps can be implemented by the household appliance 100 of the embodiment of the present disclosure, that is, the control device 108 is used to maintain the connection when the operating frequency is not less than the first preset frequency and not greater than the second preset frequency. The impedance of the input power supply circuit 102 remains unchanged.

In this way, frequent switching of the impedance of the power supply circuit 102 can be avoided.

Generally, during the operation of the home appliance 100, the operating frequency of the load 104 may fluctuate. If it is detected that the operating frequency of the load 104 is not less than the first preset frequency and not greater than the second preset frequency, the impedance connected to the power supply circuit 102 is kept unchanged, which can avoid the impedance fluctuation caused by the fluctuation of the operating frequency of the load 104 Switch frequently. In an example, when the household appliance 100 is started, the impedance connected to the power supply circuit 102 is larger as R2. When it is subsequently detected that the operating frequency of the load 104 is less than the first preset frequency and R2 is greater than the preset impedance, the impedance connected to the power supply circuit 102 is reduced, and the reduced impedance is R1. In the case that the detected operating frequency is not less than the first preset frequency and not greater than the second preset frequency, the impedance of the power supply circuit 102 connected to it is maintained at R1.

In this embodiment, if the operating frequency of the load 104 is less than the first preset frequency, it means that the load 104 is operating in the low frequency stage. If the operating frequency of the load 104 is greater than the second preset frequency, it means that the load 104 is operating in the high frequency stage. In an example, the selectable range of the first preset frequency is [29 Hz, 31 Hz), and the selectable range of the second preset frequency is [31 Hz, 33 Hz]. In an example, the first preset frequency is 30 Hz, and the second preset frequency is 32 Hz.

8 and 9, the power supply circuit 102 includes a plurality of impedance elements 106 connected in series, and step S40 includes: short-circuiting one of the plurality of impedance elements 106 when the impedance of the power supply circuit 102 is greater than the preset impedance Or several to reduce the impedance of the access power supply circuit 102.

The above steps can be implemented by the household appliance 100 in the embodiment of the present disclosure, that is, the control device 108 is used to short-circuit one or more of the multiple impedance elements 106 when the impedance of the power supply circuit 102 is greater than the preset impedance. This can reduce the impedance of the power supply circuit 102.

In this way, the purpose of reducing the impedance of the access power supply circuit 102 is achieved.

Specifically, when the impedances of the multiple impedance elements 106 are all connected to the power supply circuit 102, the total impedance is equal to the impedance R2 required by the load in the high-frequency operation stage. The number of impedance elements 106 is k (k is a positive integer), and the impedance of each impedance element 106 is Tj (1≤j≤k), that is T1+T2+...+Tj=R2. The impedance of each impedance element 106 can be the same or different.

4, 8 and 9, the impedance element 200 with a larger impedance (for example, its impedance is R2) is split into two impedance elements 106 with smaller impedance, and the impedance of each impedance element 106 is equal to the impedance element 200 Half of the impedance of, that is, the impedance of each impedance element 106 is R2/2. Since there is no change in the total impedance, when the two impedance elements 106 are connected to the power supply circuit 102, the total power consumed is the sum of the respective powers of the two impedance elements 106, which is the same as the power consumed by the impedance element 200 . If one of the impedance elements 106 is short-circuited, then the current in the power supply circuit 102 only flows through the other impedance element 106, no current flows through the impedance element 106 that is short-circuited, and the impedance element 106 does not consume power. This reduces power consumption. In an example, impedance can be understood as resistance, and the magnitude of impedance can be understood as resistance value. In addition, the impedance element 106 includes, but is not limited to, reactors, resistors, inductors, and other impedance elements 106 that can generate impedance in a circuit.

Specifically, at least one or more of the multiple impedance elements 106 are connected in parallel with the switch 110, and short-circuit one or more of the multiple impedance elements 106, including: controlling the switch 110 to close to short-circuit the multiple impedance elements 106 One or several of them. In this way, short-circuiting the impedance element 106 through the switch 110 is simple, easy to control, and low in cost.

For example, in the example of FIG. 8, the number of impedance elements 106 is two, one impedance element 106 is connected in parallel with the switching element 110, and the other impedance element 106 does not have the switching element 110 in parallel. In this way, in the initial state when the two impedance elements 106 are both connected to the power supply circuit 102 (that is, the switching element 110 is in an off state), when the impedance of the power supply circuit 102 needs to be reduced subsequently, the switching element is controlled. 110 is closed to short-circuit one of the impedance elements 106.

It can be understood that, in other embodiments, each of the two impedance elements 106 can be connected in parallel with a switch 110. When the impedance of the power supply circuit 102 needs to be reduced later, one of the switch 110 can be controlled to be closed and short. Connect one of the impedance elements 106. In addition, when the number of impedance elements 106 is greater than two, it may be that one impedance element 106 is connected in parallel with the switching element 110, and the other impedance elements 106 are not connected in parallel with the switching element 110, or each impedance element 106 is connected in parallel. The switching element 110 may also be that two of the impedance elements 106 connected in series are connected in parallel with one switching element 110, and the other impedance elements 106 are not connected in parallel with the switching element 110.

It should be noted that when reducing the impedance of the access power supply circuit 102, it should be considered that the reduced impedance of the access power supply circuit 102 must meet the relevant circuit characteristic requirements. For example, referring to FIG. 8, even when each impedance element 106 is connected in parallel with the switch 110, two impedance elements 106 cannot be short-circuited at the same time. In one example, the household appliance 100 is an air conditioner, and the circuits shown in FIGS. 8 and 9 can be applied to the outdoor unit rectifier circuit of the air conditioner. The rectifier circuit includes a rectifier bridge composed of four diodes D1, D2, D3 and D4.

8-10, the control device 108 includes a control chip 124 and a switch circuit 116. The control chip 124 is connected to the switch circuit 116 and the power supply circuit 102. The control chip 124 outputs a control signal to enable the switch circuit 116 to control the operation of the switch 110 status. The working state includes closed and open. In an example, the control chip 124 may be an MCU (Micro Control Unit, microcontroller).

In the examples of FIGS. 8 and 9, the switching element 110 includes a relay. In Figure 8, the relay is a normally open relay. When the coil of the normally open relay is not energized, the two contacts are disconnected, and after power is applied, the two contacts are closed. Therefore, when the impedance element 106 needs to be short-circuited, the control chip 124 outputs a control signal to make the switch circuit 116 continue to supply power to the relay to short-circuit the impedance element 106. In other embodiments, the relay may be a normally closed relay. When the coil of the normally closed relay is not energized, the two contacts are closed, and the two contacts are disconnected after being energized. Therefore, when the impedance element 106 needs not to be short-circuited, the control chip 124 outputs a control signal to make the switch circuit 116 continue to supply power to the relay so that the impedance element 106 is not short-circuited.

In the example of FIG. 8, the control chip 124 is connected to the control terminal 128 of the switch circuit 116 for the main chip control signal, and the control chip 124 inputs the control signal to the switch circuit 116 through the control terminal of the switch circuit 116, so that the switch circuit 116 can control the switching device. 110 working status.

In the above embodiments, since the state of the switch 110 needs to be continuously supplied with power to maintain the switch 110, the relay will increase power consumption. In order to reduce power consumption as much as possible, in some embodiments, the switch The element 110 may be a holding switch element. The control method includes: controlling the working state of the switching element by controlling the levels of the first control signal and the second control signal input to the switching circuit.

In the example of FIG. 9, the holding type switching device is a magnetic holding relay RY1. The normally open or normally closed state of the magnetic latching relay RY1 relies on the action of a permanent magnet, and the conversion of its working state is triggered by a pulse signal of a certain width. Generally, when the contacts of the magnetic latching relay RY1 are in the holding state, the coil does not need to be continuously energized, and the state of the relay can be maintained unchanged by the magnetic force of the permanent magnet. In this way, the use of the magnetic latching relay RY1 as the switch element 110 can prevent the switch element 110 from consuming more power, so as to further reduce the power consumption of the whole household appliance 100. It should be pointed out that the switching element 110 can also select other elements with switching functions, and is not limited to the relay discussed above.

Specifically, the control method includes: outputting a high-level first control signal for a preset period of time and continuously outputting a low-level second control signal to close the switch 110;

The first control signal with a low level and the second control signal with a high level are continuously output for a preset period of time, so that the switch element 110 is turned off.

The above steps can be implemented by the control device 108, that is, the control device 108 is used to control the output of the first control signal of high level for a preset period of time and continuously output the second control signal of low level to close the switch 110, and The first control signal for continuously outputting the low level and the second control signal for outputting the high level continue for a preset period of time, so that the switch 116 is turned off. In this way, the state switching of the holding switch element is realized.

Specifically, referring to FIG. 9, the initial working state of the magnetic latching relay RY1 is off, and the control chip 124 outputs a high-level first control signal for a preset period of time until the first control terminal 125 of the switch circuit 116 chip control signal 2 , Continue to output the low-level second control signal to the second control terminal 126 of the switch circuit chip control signal 1 to close the magnetic latching relay RY1. After the first control signal with a high level is output for a preset period of time, the control chip 124 controls the first control signal with a low level to be output continuously.

The control chip 124 continuously outputs the first control signal of low level to the first control terminal 125 of the switch circuit 116 and the chip control signal 2 and outputs the second control signal of high level for a preset period of time to the second control terminal of the switch circuit 116 The 126 chip controls signal 1 to turn off the magnetic latching relay RY1. After the high-level second control signal is output for a preset period of time, the control chip 124 controls the low-level second control signal to be output continuously.

In some embodiments, the preset duration can be 1 second, 10 seconds, or any value between the two. It can be understood that the high level and the low level refer to the electrical characteristics of the control signal that can trigger the action of the switch 110, such as voltage or current. The specific voltage or current is set according to the specific situation. In order to simplify the control logic, the high level is usually set to 1, and the low level is set to 0. In FIG. 9, as an example, the first control signal output 1 (representing the first control signal of high level) for 1 second and then continuously output 0 to the first control terminal 125 of the switch circuit 116. The chip control signal 2 is When the second control signal always outputs 0 (the second control signal representing the low level) to the second control terminal 126 of the switch circuit 116, the chip control signal 1, the magnetic latching relay RY1 is closed. If the first control signal always outputs 0 and the second control signal outputs 1 for 1 second and then continues to output 0, the magnetic latching relay RY1 is turned off.

In some embodiments, referring to FIG. 11, the power supply circuit 102 includes a power supply circuit 114 and an energy storage circuit 112. The control method includes: controlling the power supply circuit 114 to store energy for the impedance element 106 through the energy storage circuit 112; controlling the power supply circuit 114 and The impedance element 106 after energy storage supplies power to the load 104.

The above steps can be implemented by the household appliance 100 of the embodiment of the present disclosure, that is, the control device 108 is used to control the power supply circuit 114 to store energy for the impedance element 106 through the energy storage circuit 112; and to control the power supply circuit 114 and the stored energy The impedance element 106 supplies power to the load 104. In this way, the power supply circuit 102 can be boosted to meet the operating conditions of the load 104.

Specifically, referring to Figures 8 and 9, the energy storage circuit 112 includes a switching transistor Q1 and four diodes D5, D6, D7, and D8. The base of the switching transistor Q1 is connected to the control chip 124, and the control chip 124 controls the switching transistor Q1. Turn on and off. In an example, the switching transistor Q1 may include an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor). It should be pointed out that the component models and values shown in FIG. 8 and FIG. 9 are merely illustrative and do not limit the protection scope of the present disclosure.

The control power supply circuit 114 stores energy for the impedance element 106 through the tank circuit 112, including: turning on the switching transistor Q1 of the tank circuit 112 so that the power supply circuit 114 stores energy for the impedance element 106 through the tank circuit 112.

Controlling the power supply circuit 114 and the stored energy impedance element 106 to supply power to the load 104 includes: turning off the switching transistor Q1 of the energy storage circuit 112 so that the power supply circuit 114 and the energy stored impedance element 106 supply power to the load 104.

The above steps can be implemented by the household appliance 100 of the embodiment of the present disclosure, that is, the control device 108 is used to turn on the switching transistor Q1 of the tank circuit 112 so that the power supply circuit 114 stores energy as the impedance element 106 through the tank circuit 112, and The switching transistor Q1 of the energy storage circuit 112 is turned off so that the power supply circuit 114 and the impedance element 106 after energy storage can supply power to the load 104.

In this way, the impedance element 106 can store energy and release energy by turning on and off the switching transistor Q1. The control method is simple and the cost is low.

Specifically, referring to FIG. 12, when the switching transistor Q1 of the tank circuit 112 is turned on, the power supply 400 stores energy for the impedance element 106 through the tank circuit 112. Referring to FIG. 13, when the switching transistor Q1 of the tank circuit 112 is turned off, the energy stored in the impedance element 106 is released, which causes the voltage across the load to increase. In Fig. 12 and Fig. 13, the dashed arrow indicates the direction of current. In an example, the power source 400 may be an AC power source (for example, a two-phase AC power source), and the control signal for controlling the switching transistor Q1 may be a pulse signal. The pulse signal may be a PFC control signal output by the control chip 124. After each AC voltage zero crossing signal, the control chip 124 outputs a pulse signal, which is boosted by the PFC circuit composed of the tank circuit 112 and the impedance element 106. 14 shows the correspondence between the waveform of the AC voltage, the signal waveform of the output pin of the control chip 124, and the control signal waveform of the base of the switching transistor Q1.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" etc. means to combine the embodiments or The specific features, structures, materials, or characteristics described by the examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

Any process or method description in the flowchart or described in other ways herein can be understood as a module, segment, or part of code that includes one or more executable instructions for implementing specific logical functions or steps of the process , And the scope of the preferred embodiment of the present disclosure includes additional implementations, which may not be in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. It is understood by those skilled in the art to which the embodiments of the present disclosure belong.

The logic and/or steps represented in the flowchart or described in other ways herein, for example, can be considered as a sequenced list of executable instructions for implementing logic functions, and can be embodied in any computer-readable medium, For use by instruction execution systems, devices, or equipment (such as computer-based systems, systems including processing modules, or other systems that can fetch instructions from instruction execution systems, devices, or equipment and execute instructions), or combine these instruction execution systems, devices Or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, device, or device or in combination with these instruction execution systems, devices, or devices. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) with one or more wiring, portable computer disk cases (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable and editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, because it can be done, for example, by optically scanning the paper or other medium, and then editing, interpreting or other suitable methods when necessary. Process to obtain the program electronically and then store it in computer memory.

It should be understood that each part of the embodiments of the present disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if it is implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: a logic gate circuit for implementing logic functions on data signals Discrete logic circuits, application-specific integrated circuits with suitable combinational logic gates, programmable gate array (PGA), field programmable gate array (FPGA), etc.

A person of ordinary skill in the art can understand that all or part of the steps carried in the method of the foregoing embodiments can be implemented by a program instructing relevant hardware to complete. The program can be stored in a computer-readable storage medium, and when the program is executed , Including one of the steps of the method embodiment or a combination thereof.

In addition, the functional units in the various embodiments of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

The aforementioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure. A person of ordinary skill in the art can comment on the foregoing within the scope of the present disclosure. The implementation is subject to changes, modifications, replacements and modifications.

Claims

A control method for household appliances, characterized in that the control method includes:

Obtaining the operating frequency of the load of the household appliance and the impedance of the power supply circuit connected to the household appliance to supply power to the load;

The operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit is greater than the preset impedance, thereby reducing the impedance connected to the power supply circuit.
The control method according to claim 1, wherein the power supply circuit includes a plurality of impedance elements connected in series, and reducing the impedance connected to the power supply circuit includes:

Short-circuit one or more of the plurality of impedance elements to reduce the impedance of the power supply circuit.
The control method according to claim 2, wherein at least one or more of the multiple impedance elements are connected in parallel with a switch, and short-circuiting one or more of the multiple impedance elements comprises: controlling the The switching element is closed to short-circuit one or more of the plurality of impedance elements.
The control method according to claim 3, wherein the switch element is a holding switch element, the switch element is connected with a switch circuit, and the control method comprises: controlling the first input to the switch circuit The levels of the control signal and the second control signal control the working state of the switching element, and the working state includes closing and opening.
The control method according to claim 4, wherein the control method comprises: outputting the first control signal of a high level for a preset period of time and continuously outputting the second control signal of a low level, so that The switch is closed;

Continuously outputting the first control signal of low level and the second control signal of outputting high level for the preset period of time, turning off the switch element.
5. The control method according to any one of claims 1-5, wherein the control method comprises:

The operating frequency is less than the first preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance, and the impedance connected to the power supply circuit remains unchanged.
5. The control method according to any one of claims 1 to 6, wherein the control method comprises:

The operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit is greater than the preset impedance, and the impedance connected to the power supply circuit remains unchanged;

The operating frequency is greater than the second preset frequency and the impedance connected to the power supply circuit is not greater than the preset impedance, increasing the impedance connected to the power supply circuit;

Wherein, the second preset frequency is greater than the first preset frequency.
7. The control method according to any one of claims 1-7, wherein the control method comprises:

The operating frequency is not less than the first preset frequency and not greater than the second preset frequency, and the impedance connected to the power supply circuit is kept unchanged.
The control method according to claim 1, wherein the power supply circuit includes a power supply circuit and a storage circuit, and the control method includes:

Controlling the power supply circuit to store energy for the impedance element through the energy storage circuit;

The power supply circuit and the impedance element after energy storage are controlled to supply power to the load.
9. The control method according to claim 9, wherein controlling the power supply circuit to store energy for the impedance element through the energy storage circuit comprises:

Turning on the switching transistor of the tank circuit so that the power supply circuit stores energy for the impedance element through the tank circuit;

Controlling the power supply circuit and the impedance element after energy storage to supply power to the load includes:

The switching transistor of the energy storage circuit is turned off so that the power supply circuit and the impedance element after energy storage can supply power to the load.
A household appliance, characterized in that it comprises a control device, a power supply circuit and a load, the control device is connected to the power supply circuit and the load, the power supply circuit is used to supply power to the load, and the control device is used for Obtain the operating frequency of the load and the impedance connected to the power supply circuit, and for the operating frequency to be less than the first preset frequency and the impedance connected to the power supply circuit to be greater than the preset impedance, reducing access to the power supply The impedance of the circuit.
The household appliance according to claim 11, wherein the power supply circuit includes a plurality of impedance elements connected in series, and the control device is used to short-circuit one or more of the plurality of impedance elements to reduce access The impedance of the power supply circuit.
The household appliance according to claim 12, wherein at least one or several of the plurality of impedance elements are connected in parallel with a switch element, and the control device is used to control the switch element to close to short-circuit the plurality of impedance elements. One or several impedance components.
The household appliance according to claim 13, wherein the switch element is a holding switch element, the switch element is connected with a switch circuit, and the control device is used to control the input to the first switch circuit of the switch circuit. The levels of the control signal and the second control signal control the working state of the switching element, and the working state includes closing and opening.
The household appliance according to claim 14, wherein the control device is used to control the output of the first control signal at a high level for a predetermined duration and continuously output the second control signal at a low level, The switching element is closed, and the first control signal for continuously outputting the low level and the second control signal for outputting the high level is continued for the preset period of time, so that the switching element is opened.
The household appliance according to any one of claims 11-15, wherein the control device is used for the operating frequency to be less than the first preset frequency and the impedance connected to the power supply circuit to be less than The preset impedance keeps the impedance connected to the power supply circuit unchanged.
The household appliance according to any one of claims 11-16, wherein the control device is used for the operating frequency to be greater than the second preset frequency and the impedance connected to the power supply circuit to be greater than the preset Impedance, keeping the impedance connected to the power supply circuit unchanged, and for the operating frequency to be greater than the second preset frequency and the impedance connected to the power supply circuit not to be greater than the preset impedance, increasing the access point The impedance of the power supply circuit; where,

The second preset frequency is greater than the first preset frequency.
The household appliance according to any one of claims 11-17, wherein the control device is used for the operating frequency not less than the first preset frequency and not greater than the second preset frequency, Keep the impedance connected to the power supply circuit unchanged.
The household appliance according to claim 11, wherein the power supply circuit includes a power supply circuit and an energy storage circuit, and the control device is used to control the power supply circuit to store energy for the impedance element through the energy storage circuit. , And used to control the power supply circuit and the impedance element after energy storage to supply power to the load.
The household appliance according to claim 19, wherein the control device is used to turn on the switching transistor of the energy storage circuit so that the power supply circuit can store energy for the impedance element through the energy storage circuit, And a switch transistor used to cut off the energy storage circuit so that the power supply circuit and the impedance element after energy storage can supply power to the load.