Standby zero power consumption circuit and household appliance

Abstract

The utility model discloses a standby zero-power-consumption circuit and a household appliance. The standby zero-power-consumption circuit comprises a controller, a first switch branch, a second switch branch and a power converter. The first switch branch establishes a connection between a live wire of the AC power supply and the first power supply, or establishes a connection between the first power supply and the controller. The controller alternately outputs a first level signal and a second level signal. The second switch branch is switched on in response to the first level signal so as to establish connection between the live wire of the AC power supply and the power converter and the first power supply, and is switched off in response to the second level signal so as to disconnect the live wire of the AC power supply and the power converter and the first power supply. The power converter outputs the first power supply when connected with the live wire of the AC power supply, and stops outputting the first power supply when not connected with the live wire of the AC power supply. By means of the mode, the standby zero-power-consumption circuit suitable for the household appliances without isolation driving can be provided, and the cost is low.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and particularly to a standby zero-power consumption circuit and a household appliance. Background Art

[0002] With the development of society, the requirements for the standby power consumption of household appliances are becoming more and more stringent. In order to conform to the general environment and improve its own competitiveness, various household appliances (such as washing machines) have also designed products with standby zero power consumption, which not only do not waste electricity during standby, but also are convenient to operate.

[0003] The existing standby zero-power consumption circuits usually adopt a fully isolated method to prevent safety accidents such as electric shock to users. However, when this method is applied to household appliances that do not require isolated driving, it results in the use of additional isolation devices (such as optocouplers) in scenarios where isolation is not required, thereby increasing the cost. Summary of the Utility Model

[0004] The embodiments of the present application provide a standby zero-power consumption circuit and a household appliance, which can provide a standby zero-power consumption circuit suitable for household appliances that do not require isolated driving and have a lower cost.

[0005] In a first aspect, the embodiments of the present application provide a standby zero-power consumption circuit applied to a household appliance, where the household appliance includes a housing, the housing is grounded or the material of the housing is a non-conductive material, and the standby zero-power consumption circuit includes:

[0006] A controller;

[0007] A first switch branch, which is respectively connected to the live wire of the AC power supply, a first power supply and the controller, and is configured to establish a connection between the live wire of the AC power supply and the first power supply, or establish a connection between the first power supply and the controller;

[0008] The controller is configured to alternately output a first level signal and a second level signal in response to the disconnection of the first power supply from the controller, where, each time the first power supply is disconnected from the controller, the controller outputs one of the first level signal and the second level signal;

[0009] A second switch branch and a power converter, the second switch branch is respectively connected to the controller, the live wire of the AC power supply, the first power supply and the power converter, and the second switch branch is configured to conduct in response to the first level signal to establish a connection between the live wire of the AC power supply, the power converter and the first power supply, and is configured to turn off in response to the second level signal to disconnect the live wire of the AC power supply from the power converter and the first power supply;

[0010] The power converter is configured to output the first power supply when it is connected to the live wire of the AC power supply, and is configured to stop outputting the first power supply when it is not connected to the live wire of the AC power supply.

[0011] In one or more embodiments, the standby zero-power consumption circuit further includes:

[0012] A signal processing branch, connected between the first switch branch and the controller, is configured to implement a pull-down and filtering function.

[0013] In one or more embodiments, the second switch branch includes a first switch unit and a second switch unit;

[0014] The first switch unit, connected between the second switch unit and the controller, is configured to conduct in response to the first level signal and is configured to turn off in response to the second level signal;

[0015] The second switch unit is respectively connected to the first switch unit, the live wire of the AC power supply, the first power supply, and the power converter, and is configured to establish a connection between the live wire of the AC power supply, the power converter, and the first power supply in response to the conduction of the first switch unit, and is configured to disconnect the connection between the live wire of the AC power supply, the power converter, and the first power supply in response to the turn-off of the first switch unit.

[0016] In one or more embodiments, the first switch branch includes a button;

[0017] The first end of the button is connected to the live wire of the AC power supply, the second end of the button is connected to the first power supply, and the third end of the button is connected to the controller;

[0018] Wherein, when the button is not pressed, the second end and the third end of the button are connected, and when the button is pressed, the first end and the second end of the button are connected.

[0019] In one or more embodiments, the signal processing branch includes a first resistor, a second resistor, and a first capacitor;

[0020] The second resistor is connected between the first switch branch and the ground, the first resistor is connected between the first switch branch and the controller, and the first capacitor is connected between the controller and the ground.

[0021] In one or more embodiments, the first switch unit includes a third resistor, a fourth resistor, and a first switch tube;

[0022] The third resistor and the fourth resistor are connected in series between the controller and ground. The connection point between the third resistor and the fourth resistor is connected to the first end of the first switching transistor. The second end of the first switching transistor is grounded, and the third end of the first switching transistor is connected to the second switching unit.

[0023] In one or more embodiments, the first switching transistor is an NPN-type triode;

[0024] The first end of the first switching transistor is the base of the NPN-type triode, the second end of the first switching transistor is the emitter of the NPN-type triode, and the third end of the first switching transistor is the collector of the NPN-type triode.

[0025] In one or more embodiments, the second switching unit includes a relay and a first diode. The relay includes a coil and a pair of normally open contacts;

[0026] The first end of the coil is respectively connected to the second power supply and the cathode of the first diode. The second end of the coil is respectively connected to the anode of the first diode and the first switching unit. One of the pair of normally open contacts is connected to the live wire of the AC power supply, and the other contact is respectively connected to the first power supply and the power converter.

[0027] In a second aspect, an embodiment of the present application provides a household appliance, including a housing and the standby zero-power consumption circuit as described above. Wherein, the housing is grounded or the material of the housing is a non-conductive material.

[0028] In one or more embodiments, the household appliance is a washing machine.

[0029] The beneficial effects of the present application are as follows: The standby zero-power consumption circuit of the embodiment of the present application includes a controller, a first switch branch, a second switch branch, and a power converter. The first switch branch is respectively connected to the live wire of the AC power supply, the first power supply, and the controller. The first switch branch is configured to establish a connection between the live wire of the AC power supply and the first power supply, or establish a connection between the first power supply and the controller. The controller is configured to alternately output a first level signal and a second level signal in response to the disconnection of the first power supply from the controller, where one of the first level signal and the second level signal is output by the controller each time the first power supply is disconnected from the controller. The second switch branch is respectively connected to the controller, the live wire of the AC power supply, the first power supply, and the power converter. The second switch branch is configured to conduct in response to the first level signal to establish a connection between the live wire of the AC power supply, the power converter, and the first power supply, and is configured to turn off in response to the second level signal to disconnect the connection between the live wire of the AC power supply, the power converter, and the first power supply. The power converter is configured to output the first power supply when it is connected to the live wire of the AC power supply, and is configured to stop outputting the first power supply when it is not connected to the live wire of the AC power supply. Assuming that currently a connection between the live wire of the AC power supply and the first power supply is established through the first switch branch, corresponding to the disconnection of the connection between the first power supply and the controller, the controller outputs the first level signal. Subsequently, the second switch branch conducts, and a connection between the live wire of the AC power supply, the power converter, and the first power supply is established, and the power converter outputs the first power supply, so that the load can be powered. Then, the next time a connection between the live wire of the AC power supply and the first power supply is established through the first switch branch, corresponding to the disconnection of the connection between the first power supply and the controller, the controller outputs the second level signal. Subsequently, the second switch branch turns off, and the connection between the live wire of the AC power supply, the power converter, and the first power supply is disconnected, and the power converter stops outputting the first power supply, thus achieving standby zero power consumption. At the same time, if the housing of the household appliance to which the standby zero-power consumption circuit is applied is grounded or the material of the housing is a non-conductive material, then the standby zero-power consumption circuit can be applied to household appliances that do not require isolated drive, and there is no need to use additional isolation devices as in the related art, and the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are illustrated by way of example in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements.

[0031] Figure 1 is a schematic structural diagram of the standby zero-power consumption circuit provided by the embodiment of the present application Figure 1 ;

[0032] Figure 2 is a schematic structural diagram of the standby zero-power consumption circuit provided by the embodiment of the present application Figure 2 ;

[0033] Figure 3 is a schematic diagram of the standby zero-power consumption circuit provided by an embodiment of the present application Figure 3 ;

[0034] Figure 4 is related to Figure 3 a schematic diagram of a circuit structure corresponding to the shown structure. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and detailedly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is expressed as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0037] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the standby zero-power consumption circuit provided by an embodiment of the present application. Among them, the standby zero-power consumption circuit is applied to household appliances. The household appliances include a housing, and the housing is grounded or the material of the housing is a non-conductive material. Thus, safety accidents such as user electric shock will not occur in the household appliances. Then, the isolation drive does not need to be provided in the standby zero-power consumption circuit provided in the household appliances. As Figure 1 shown, the standby zero-power consumption circuit 100 includes a first switch branch 10, a second switch branch 20, a controller 30, and a power converter 40.

[0039] Among them, the controller 30 can adopt a micro control unit (MCU) or a digital signal processing (DSP) controller, etc.

[0040] Among them, the first switch branch 10 is respectively connected to the live wire L of the AC power supply VIN, the first power supply V1, and the controller 30, and the second switch branch 20 is respectively connected to the controller 30, the live wire L of the AC power supply VIN, the first power supply V1, and the power converter 40. Specifically, the first end of the first switch branch 10 is connected to the live wire L of the AC power supply VIN, the second end of the first switch branch 10 is connected to the first power supply V1, the third end of the first switch branch 10 is connected to the controller 30, the first end of the second switch branch 20 is connected to the live wire L of the AC power supply VIN, the second end of the second switch branch 20 is respectively connected to the first power supply V1, the first input end and the first output end of the power converter 40, and the third end of the second switch branch 20 is connected to the controller 30. In some embodiments, the AC power supply VIN is the mains power.

[0041] Specifically, the first switch branch 10 is configured to establish a connection between the live wire L of the AC power supply VIN and the first power supply V1, or establish a connection between the first power supply V1 and the controller 30. The controller 30 is configured to alternately output a first level signal and a second level signal in response to the disconnection between the first power supply V1 and the controller 30, where one of the first level signal and the second level signal is output by the controller 30 each time the first power supply is disconnected from the controller. For example, if the controller 30 outputs the first level signal when the first power supply V1 is disconnected from the controller 30 for the first time, then the controller 30 outputs the second level signal when the first power supply V1 is disconnected from the controller 30 for the second time, the controller 30 outputs the first level signal when the first power supply V1 is disconnected from the controller 30 for the third time, the controller 30 outputs the second level signal when the first power supply V1 is disconnected from the controller 30 for the fourth time... and so on. The second switch branch 20 is configured to conduct in response to the first level signal to establish a connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1, and is configured to turn off in response to the second level signal to disconnect the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1. The power converter 40 is configured to output the first power supply V1 when the power converter 40 is connected to the live wire L of the AC power supply VIN, and is configured to stop outputting the first power supply V1 when the power converter 40 is not connected to the live wire L1 of the AC power supply VIN. Among them, the first level signal and the second level signal are different. When the first level signal is a high level signal, the second level signal is a low level signal; when the first level signal is a low level signal, the second level signal is a high level signal.

[0042] In practical applications, assume that for the first time, the connection between the live wire L of the AC power supply VIN and the first power supply V1 is established through the first switch branch 10, corresponding to the disconnection of the connection between the first power supply V1 and the controller 30. At this time, the controller 30 outputs a first-level signal to the second switch branch 20. Subsequently, the second switch branch 20 conducts, and the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 is established. It can be understood that in this embodiment, the second input terminal of the power converter 40 is connected to the neutral wire of the AC power supply VIN. It can be seen that the power converter 40 inputs the AC power supply VIN and performs a power conversion function to obtain the first power supply V1 based on the AC power supply VIN. And the first power supply V1 is output to the load to supply power to the load. For example, when the household appliance is a washing machine, the first power supply V1 can supply power to loads such as a motor, a water inlet valve, and a drain valve.

[0043] After that, if the connection between the live wire L of the AC power supply VIN and the first power supply V1 is established again through the first switch branch 10 for the second time, corresponding to the disconnection of the connection between the first power supply V1 and the controller 30, the controller 30 outputs a second-level signal to the second switch branch 20. Subsequently, the second switch branch 20 is turned off, the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 is disconnected, and the power converter 40 stops outputting the first power supply V1, then the first power supply V1 no longer supplies power to the load, thus achieving zero standby power consumption. After that, if the connection between the live wire L of the AC power supply VIN and the first power supply V1 is established again through the first switch branch 10 for the third time, corresponding to the disconnection of the connection between the first power supply V1 and the controller 30, the controller 30 outputs the first-level signal to the second switch branch 20 again and repeats the above process, which will not be elaborated here.

[0044] In addition, since the housing of the household appliance to which the zero standby power consumption circuit 100 is applied is grounded or the material of the housing is a non-conductive material, the zero standby power consumption circuit 100 can be applied to household appliances that do not require isolated driving. Secondly, in the related art, the zero standby power consumption circuit usually adopts a fully isolated method to prevent safety accidents such as electric shock to users. For example, a circuit for outputting a switching signal and an MCU are provided in the zero standby power consumption circuit, and the switching signal is used to switch between the working state (the state where the load is powered on) and the zero standby power consumption state (the state where the load is powered off), and corresponding isolation devices (such as optocouplers) need to be provided in the circuit for outputting the switching signal and the MCU. In the embodiment of the present application, since it is applied to household appliances that do not require isolated driving, there is no need to adopt additional isolation devices as in the related art, and the cost is relatively low.

[0045] In one embodiment, as Figure 2 shown, the zero standby power consumption circuit 100 further includes a signal processing branch 50.

[0046] Among them, the signal processing branch 50 is connected between the first switch branch 10 and the controller 30. Specifically, the first end of the signal processing branch 50 is connected to the third end of the first switch branch 10, and the second end of the signal processing branch 50 is connected to the controller 30.

[0047] The signal processing branch 50 is configured to implement the pull-down and filtering functions. Through the pull-down function, it can ensure that when the first power supply V1 is disconnected from the controller 30, a stable low level is output to the controller 30 to improve stability and reliability. Through the filtering function, it can filter out interference signals in the signal input to the controller 30, such as spike pulses, to protect the controller 30.

[0048] In one embodiment, as Figure 3 shown, the second switch branch 20 includes a first switch unit 21 and a second switch unit 22.

[0049] Among them, the first switch unit 21 is connected between the second switch unit 22 and the controller 30. The second switch unit 22 is respectively connected to the first switch unit 21, the live wire L of the AC power supply VIN, the first power supply V1, and the power converter 40. Specifically, the first end of the first switch unit 21 is connected to the controller 30, the second end of the first switch unit 21 is connected to the first end of the second switch unit 22, the second end of the second switch unit 22 is connected to the live wire L of the AC power supply VIN, and the third end of the second switch unit 22 is respectively connected to the first power supply V1, the first input end, and the first output end of the power converter 40. The second end of the second switch unit 22 is the first end of the second switch branch 20, the third end of the second switch unit 22 is the second end of the second switch branch 20, and the first end of the first switch unit 21 is the third end of the second switch branch 20.

[0050] The first switch unit 21 is configured to turn on in response to a first level signal and turn off in response to a second level signal. The second switch unit 22 is configured to establish a connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 when the first switch unit 21 is turned on, and is configured to disconnect the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 when the first switch unit 21 is turned off. That is, when the controller 30 outputs a first level signal to the first switch unit 21, the first switch unit 21 is turned on, the second switch unit 22 is also turned on, the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 is established, the power converter 40 inputs the AC power supply VIN, and outputs the first power supply V1 based on the AC power supply VIN; when the controller 30 outputs a second level signal to the first switch unit 21, the first switch unit 21 is turned off, the second switch unit 22 is also turned off, the connection between the live wire L of the AC power supply VIN, the power converter 40, and the first power supply V1 is disconnected, the power converter 40 stops outputting the first power supply V1, and then the first power supply V1 no longer supplies power to the load, thus achieving zero standby power consumption.

[0051] Please refer to Figure 4 , Figure 4 which exemplarily shows a circuit structure corresponding to the Figure 3 structure shown. As Figure 4 shown, the first switch branch 10 includes a key K1.

[0052] Among them, the first terminal S1 of the key K1 is connected to the live wire L of the AC power supply VIN, the second terminal S2 of the key K2 is connected to the first power supply V1, and the third terminal S3 of the key K1 is connected to the controller 30. When the key K1 is not pressed, the second terminal S2 and the third terminal S3 of the key K2 are connected, corresponding to establishing a connection between the first power supply V1 and the controller 30, and disconnecting the connection between the live wire L of the AC power supply VIN and the first power supply V1; when the key K1 is pressed, the first terminal S1 and the second terminal S2 of the key K2 are connected, corresponding to disconnecting the connection between the first power supply V1 and the controller 30, and establishing a connection between the live wire L of the AC power supply VIN and the first power supply V1.

[0053] In this embodiment, the signal processing branch 50 includes a first resistor R1, a second resistor R2, and a first capacitor C1.

[0054] Among them, the second resistor R2 is connected between the third terminal of the first switch branch 10 and the ground GND, the first resistor R1 is connected between the third terminal of the first switch branch 10 and the controller 30, and the first capacitor C1 is connected between the controller 30 and the ground.

[0055] Specifically, the second resistor R2 is used to implement a pull-down function. The first resistor R1 and the first capacitor C1 are used to implement a filtering function.

[0056] In this embodiment, the first switch unit 21 includes a third resistor R3, a fourth resistor R4, and a first switching transistor Q1.

[0057] Among them, the third resistor R3 and the fourth resistor R4 are connected in series between the controller 30 and the ground GND. The connection point between the third resistor R3 and the fourth resistor R4 is connected to the first end of the first switching transistor Q1. The second end of the first switching transistor Q1 is grounded to GND, and the third end of the first switching transistor Q1 is connected to the first end of the second switch unit 22.

[0058] Specifically, the third resistor R3 is used for current limiting. The third resistor R3 and the fourth resistor R4 divide the voltage of the signal output by the controller 30. The voltage of the signal output by the controller 30 across the fourth resistor R4 drives the first switching transistor Q1 to conduct. The fourth resistor R4 can also discharge the charge when the first switching transistor Q1 is turned off, ensuring reliable turn-off of the first switching transistor Q1.

[0059] Among them, in this embodiment, taking the first switching transistor Q1 as an NPN-type triode as an example. The base of the NPN-type triode is the first end of the first switching transistor Q1, the emitter of the NPN-type triode is the second end of the first switching transistor Q1, and the collector of the NPN-type triode is the third end of the first switching transistor Q1.

[0060] In addition, the first switching transistor Q1 can be any controllable switch, for example, an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0061] In this embodiment, the second switch unit 22 includes a relay K2 and a first diode D1. The relay K2 includes a coil KM and a pair of normally open contacts SM.

[0062] Among them, the first end of the coil KM is respectively connected to the second power supply V2 and the cathode of the first diode D1. The second end of the coil KM is respectively connected to the anode of the first diode D1 and the second end of the first switch unit 21. One of the pair of normally open contacts SM is connected to the live wire L of the AC power supply VIN, and the other contact is respectively connected to the first power supply V1, the first input terminal and the first output terminal of the power converter 40. In some embodiments, when the coil of the relay K1 uses a supply voltage of 24V, the voltage of the first power supply V1 is 24V.

[0063] Specifically, the first diode D1 is a freewheeling diode.

[0064] The principle of the circuit shown below Figure 4 will be described again.

[0065] Assume that the button K1 is pressed for the first time currently. The button K1 switches from the connection between the second terminal S2 and the third terminal S3 to the connection between the first terminal S1 and the second terminal S2, that is, the connection between the live wire L of the AC power supply VIN and the first power supply V1 is established, and the connection between the first power supply V1 and the controller 30 is disconnected. At this time, due to the action of the second resistor R2, the controller 30 receives a low-level signal. The controller 30 outputs a first-level signal to the first switching transistor Q1, and the first switching transistor Q1 conducts. The second power supply V2, the coil KM, and the first switching transistor Q1 form a loop, and the coil KM is energized. A pair of normally open contacts SM is closed, and the connection between the live wire L of the AC power supply VIN and the first input terminal of the power converter 40 is established. And the second input terminal of the power converter 40 is connected to the neutral wire of the AC power supply VIN. Then the power converter 40 inputs the AC power supply VIN and performs a power conversion function to obtain the first power supply V1 based on the AC power supply VIN. And the first power supply V1 is output to the load to supply power to the load. It can be understood that after the button K1 is pressed, if the button K1 is released, the button K1 will switch from the connection between the first terminal S1 and the second terminal S2 to the connection between the second terminal S2 and the third terminal S3, but no operation is performed at this time.

[0066] After that, if the button K1 is pressed for the second time, the button K1 switches from the connection between the second terminal S2 and the third terminal S3 to the connection between the first terminal S1 and the second terminal S2 again, that is, the connection between the live wire L of the AC power supply VIN and the first power supply V1 is established again, and the connection between the first power supply V1 and the controller 30 is disconnected. At this time, the controller 30 outputs a second-level signal to the first switching transistor Q1 to turn off the first switching transistor Q1. The loop between the second power supply V2, the coil KM, and the first switching transistor Q1 is disconnected, and the coil KM loses power. A pair of normally open contacts SM is disconnected, the connection between the live wire L of the AC power supply VIN and the first input terminal of the power converter 40 is disconnected, the power converter 40 stops outputting the first power supply V1, and the first power supply V1 no longer supplies power to the load, thus achieving zero standby power consumption. Of course, after the button K1 is pressed, if the button K1 is released, the button K1 will switch from the connection between the first terminal S1 and the second terminal S2 to the connection between the second terminal S2 and the third terminal S3, but no operation is performed at this time.

[0067] After that, if the button K1 is pressed for the third time, the button K1 switches from the connection between the second terminal S2 and the third terminal S3 to the connection between the first terminal S1 and the second terminal S2 again and repeats the above process, which will not be elaborated here.

[0068] In addition, since the housing of the household appliance to which the standby zero-power consumption circuit 100 is applied is grounded or the material of the housing is a non-conductive material, the standby zero-power consumption circuit 100 can be applied to household appliances that do not require isolated driving. And, in this embodiment, since it is applied to household appliances that do not require isolated driving, there is no need to use additional isolation devices as in the related art, and the cost is relatively low.

[0069] In this embodiment, the power converter 40 is further configured to output a second power supply V2 based on when the power converter 40 is connected to the live wire L of the AC power supply VI N, that is, when the power converter 40 inputs the AC power supply VI N, it can obtain the second power supply V2 after performing the power conversion function based on the AC power supply VIN. The second power supply V2 is also used to supply power to the load. In addition, it can be understood that, in the embodiments of the present application, the power converter 40 is a converter with a built-in isolation function, so that the live wire L of the AC power supply VIN can be connected to the first power supply V1 without a circuit fault.

[0070] The embodiments of the present application further provide a household appliance, which includes a housing and the standby zero-power consumption circuit 100 in any embodiment of the present application. Among them, the housing is grounded or the material of the housing is a non-conductive material.

[0071] In some embodiments, the household appliance is a washing machine.

[0072] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A standby zero-power consumption circuit, characterized in that, Applied to household appliances, the household appliances include a housing, the housing is grounded or the material of the housing is a non-conductive material, and the standby zero-power consumption circuit includes: A controller; A first switch branch, respectively connected to the live wire of the AC power supply, a first power supply and the controller, and configured to establish a connection between the live wire of the AC power supply and the first power supply, or establish a connection between the first power supply and the controller; The controller is configured to alternately output a first level signal and a second level signal in response to the disconnection between the first power supply and the controller, wherein, each time the first power supply is disconnected from the controller, the controller outputs one of the first level signal and the second level signal; A second switch branch and a power converter, the second switch branch is respectively connected to the controller, the live wire of the AC power supply, the first power supply and the power converter, and the second switch branch is configured to conduct in response to the first level signal to establish a connection between the live wire of the AC power supply and the power converter and the first power supply, and is configured to turn off in response to the second level signal to disconnect the live wire of the AC power supply from the power converter and the first power supply; The power converter is configured to output the first power supply when it is connected to the live wire of the AC power supply, and is configured to stop outputting the first power supply when it is not connected to the live wire of the AC power supply.

2. The standby zero-power consumption circuit according to claim 1, wherein, It further includes: A signal processing branch, connected between the first switch branch and the controller, and configured to implement a pull-down and filtering function.

3. The standby zero-power consumption circuit according to claim 1 or 2, characterized in that, The second switch branch includes a first switch unit and a second switch unit; The first switch unit, connected between the second switch unit and the controller, is configured to conduct in response to the first level signal and is configured to turn off in response to the second level signal; The second switch unit is respectively connected to the first switch unit, the live wire of the AC power supply, the first power supply and the power converter, and is configured to establish a connection between the live wire of the AC power supply and the power converter and the first power supply in response to the conduction of the first switch unit, and is configured to disconnect the live wire of the AC power supply from the power converter and the first power supply in response to the turn-off of the first switch unit.

4. The standby zero-power consumption circuit according to claim 1, characterized in that, The first switch branch includes a key; The first end of the key is connected to the live wire of the AC power supply, the second end of the key is connected to the first power supply, and the third end of the key is connected to the controller; Wherein, when the key is not pressed, the second end and the third end of the key are connected, and when the key is pressed, the first end and the second end of the key are connected.

5. The standby zero-power consumption circuit according to claim 2, characterized in that The signal processing branch includes a first resistor, a second resistor and a first capacitor; The second resistor is connected between the first switch branch and the ground, the first resistor is connected between the first switch branch and the controller, and the first capacitor is connected between the controller and the ground.

6. The standby zero-power consumption circuit according to claim 3, wherein The first switch unit includes a third resistor, a fourth resistor and a first switch tube; The third resistor and the fourth resistor are connected in series between the controller and the ground. The connection point between the third resistor and the fourth resistor is connected to the first end of the first switching tube. The second end of the first switching tube is grounded, and the third end of the first switching tube is connected to the second switching unit.

7. The standby zero-power consumption circuit according to claim 6, characterized in that, The first switching tube is an NPN type triode; The first end of the first switching tube is the base of the NPN type triode, the second end of the first switching tube is the emitter of the NPN type triode, and the third end of the first switching tube is the collector of the NPN type triode.

8. The standby zero-power consumption circuit according to claim 3, characterized in that, The second switching unit includes a relay and a first diode. The relay includes a coil and a pair of normally open contacts; The first end of the coil is respectively connected to the second power supply and the cathode of the first diode. The second end of the coil is respectively connected to the anode of the first diode and the first switching unit. One of the pair of normally open contacts is connected to the live wire of the AC power supply, and the other contact is respectively connected to the first power supply and the power converter.

9. A household appliance, characterized in that, It includes a housing and the standby zero-power consumption circuit according to any one of claims 1-8, wherein the housing is grounded or the material of the housing is a non-conductive material.

10. The household appliance according to claim 9, characterized in that, The household appliance is a washing machine.

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