Load power supply circuit and household appliance

Abstract

The utility model discloses a load power supply circuit and a household appliance. The load power supply circuit comprises a voltage regulation branch, a voltage detection branch, a switch branch and a controller. The voltage regulating branch circuit, the voltage detection branch circuit and the load are connected to the first node, the voltage detection branch circuit and the switch branch circuit are connected with the controller, and the switch branch circuit is connected with a zero line of an alternating current power supply and the voltage regulating branch circuit. The voltage detection branch is configured to output a detection voltage to the controller based on a first voltage, the first voltage being a voltage value at the first node. The controller is configured to output a first control signal to the switch branch when the detection voltage is smaller than a first preset voltage. The switch branch is configured to establish connection between the zero line of the AC power supply and the voltage regulation branch when receiving the first control signal, so that the voltage regulation branch regulates the voltage value of the first node. Through the above mode, the voltage for supplying power to the load can be adaptively adjusted according to the commercial power so as to be suitable for commercial power with different voltage standards, and the risk of damaging household appliances is reduced.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electronic circuit, in particular to a load power supply circuit and household appliance. BACKGROUND

[0002] With the development of China's economy, foreign export trade is also increasing, and various household appliances (such as variable frequency refrigerators) also begin to export to the world. Among the global, there are two main voltage standards for the mains, one is 220V, mainly used in China, India and other countries, and the voltage during actual power supply is usually between 220V and 240V; the other is 110V, mainly used in the United States, Japan and other countries, and the voltage during actual power supply is usually between 100V and 120V.

[0003] Therefore, it is necessary to configure household appliances suitable for the mains of different countries. However, this kind of way may exist the abnormal situation that the household appliances suitable for the mains with the voltage standard of 110V are used in the country with the voltage standard of 220V, and there is a risk of damaging the household appliances. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a load power supply circuit and household appliance, which can adaptively adjust the voltage for the load according to the mains, so as to be suitable for the mains with different voltage standards and reduce the risk of damaging the household appliance.

[0005] In a first aspect, the embodiment of the present application provides a load power supply circuit, comprising:

[0006] a voltage regulating branch, a voltage detection branch, a switch branch and a controller;

[0007] The voltage regulating branch, the voltage detection branch and the load are connected to a first node, the voltage detection branch and the switch branch are connected to the controller, and the switch branch is connected to the zero line of the alternating current power supply and the voltage regulating branch.

[0008] The voltage detection branch is configured to output a detection voltage to the controller based on a first voltage, wherein the first voltage is the voltage value at the first node.

[0009] The controller is configured to output a first control signal to the switch branch when the detection voltage is less than a first preset voltage.

[0010] The switch branch is configured to establish the connection between the zero line of the alternating current power supply and the voltage regulating branch when receiving the first control signal, so that the voltage regulating branch adjusts the voltage value of the first node.

[0011] In one or more embodiments, the switch branch includes a first switch unit and a second switch unit;

[0012] The first switch unit is connected with the controller, and the first switch unit is further connected between a first power supply and the second switch unit, and the second switch unit is further connected between a zero line of the alternating current power supply and the voltage regulation branch;

[0013] The first switch unit is configured to be turned on to establish a connection between the first power supply and the second switch unit when the first control signal is received, and to be turned off to disconnect the connection between the first power supply and the second switch unit when the first control signal is not received;

[0014] The second switch unit is configured to be turned on to establish a connection between the zero line of the alternating current power supply and the voltage regulation branch when the second switch unit is connected with the first power supply, and to be turned off to disconnect the connection between the zero line of the alternating current power supply and the voltage regulation branch when the second switch unit is disconnected with the first power supply.

[0015] In one or more embodiments, the switch branch further includes a third switch unit, the third switch unit is connected between the second switch unit and ground, and the third switch unit is connected with the controller;

[0016] The first switch unit is further configured to be turned on to establish a connection between the first power supply and the second switch unit when a first sub-control signal is received, and to be turned off to disconnect the connection between the first power supply and the second switch unit when the first sub-control signal is not received, wherein the first control signal includes the first sub-control signal and a second sub-control signal;

[0017] The third switch unit is configured to be turned on to establish a connection between the second switch unit and ground when a second sub-control signal is received, and to be turned off to disconnect the connection between the second switch unit and ground when the second sub-control signal is not received;

[0018] The second switch unit is further configured to be turned on to establish a connection between the zero line of the alternating current power supply and the voltage regulation branch when the second switch unit is connected with at least one of the first power supply and ground, and to be turned off to disconnect the connection between the zero line of the alternating current power supply and the voltage regulation branch when the second switch unit is disconnected with at least one of the first power supply and ground.

[0019] In one or more embodiments, the load power supply circuit further includes a rectification branch, the rectification branch is connected with the alternating current power supply, the voltage regulation branch;

[0020] The rectification branch includes a rectifier bridge;

[0021] The first end of the rectifier bridge is connected with the live wire of the AC power supply, the second end of the rectifier bridge is connected with the zero wire of the AC power supply and the switch branch, the third end of the rectifier bridge is connected to the first node, and the fourth end of the rectifier bridge is grounded.

[0022] In one or more embodiments, the voltage regulating branch includes a first capacitor, a second capacitor, a first resistor and a second resistor;

[0023] The first capacitor and the second capacitor are connected in series between the first node and the ground, the first capacitor and the second capacitor are connected to the second node, the first resistor and the second resistor are connected in series between the first node and the ground, and the first resistor and the second resistor are connected to the second node.

[0024] In one or more embodiments, the voltage detecting branch includes a third resistor, a fourth resistor, a third capacitor, a fourth capacitor and a first diode;

[0025] The third resistor and the fourth resistor are connected in series between the first node and the ground, the third capacitor and the fourth resistor and the fourth capacitor are connected in parallel, the connection point between the third resistor and the fourth resistor is connected with the anode of the first diode and the controller respectively, and the cathode of the first diode is connected with the second power supply.

[0026] In one or more embodiments, the first switch unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a first switch tube;

[0027] The fifth resistor and the sixth resistor are connected in series between the controller and the ground, the connection point between the fifth resistor and the sixth resistor is connected with the first end of the first switch tube, the second end of the first switch tube is grounded, the third end of the first switch tube is connected with the first end of the second switch tube through the seventh resistor, the eighth resistor is connected between the first end and the second end of the second switch tube, the second end of the second switch tube is grounded, and the third end of the second switch tube is connected with the second switch unit.

[0028] In one or more embodiments, the second switch unit includes a relay, a second diode and a ninth resistor, wherein the relay includes a coil and a pair of normally open contacts;

[0029] The first end of the coil is connected with the cathode of the second diode and the first switch unit respectively, the second end of the coil is connected with the anode of the second diode and the first end of the ninth resistor respectively, the second end of the ninth resistor is grounded, the first contact of the pair of normally open contacts is connected with the zero line of the alternating current power supply, and the second contact of the pair of normally open contacts is connected with the voltage regulation branch.

[0030] In one or more embodiments, the third switch unit comprises a tenth resistor, an eleventh resistor and a third switch tube.

[0031] The tenth resistor and the eleventh resistor are connected in series between the controller and the ground, the connection point between the tenth resistor and the eleventh resistor is connected with the first end of the third switch tube, the second end of the third switch tube is grounded, and the third end of the third switch tube is connected with the second switch unit.

[0032] In a second aspect, the embodiments of the present application provide a household appliance comprising the load power supply circuit.

[0033] The load power supply circuit comprises a voltage regulation branch, a voltage detection branch, a switch branch and a controller. The voltage regulation branch, the voltage detection branch and the load are connected to a first node, the voltage detection branch and the switch branch are connected to the controller, and the switch branch is connected to the zero line of the alternating current power supply and the voltage regulation branch. The voltage detection branch outputs a detection voltage to the controller based on a first voltage, wherein the first voltage is the voltage value at the first node. When the alternating current power supply is a city power supply with a voltage standard of 220V, the controller can determine that the detection voltage is greater than or equal to a first preset voltage, the controller does not output a first control signal to the switch branch, and the voltage at the first node remains unchanged to supply power to the load. When the alternating current power supply is a city power supply with a voltage standard of 110V, the controller can determine that the first voltage is less than the first preset voltage, the controller outputs the first control signal to the switch branch, and the connection between the zero line of the alternating current power supply and the voltage regulation branch is established to enable the voltage regulation branch to regulate the voltage at the first node and supply power to the load based on the regulated voltage. Thus, although the voltage at the first node decreases by half when the voltage standard of the city power supply is reduced from 220V to 110V, the voltage at the first node is increased by the voltage regulation branch, so that the voltage at the first node remains unchanged, which means that the voltage for supplying power to the load remains basically unchanged. Therefore, the load power supply circuit can adaptively adjust according to the city power supply to keep the voltage for supplying power to the load basically unchanged, so that the household appliance comprising the load power supply circuit can be applied to city power supplies with different voltage standards, thereby reducing the risk of damage to the household appliance comprising the load power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0034] One or more embodiments are illustrated by way of example in the drawings and described herein in connection with the appended drawings, which are incorporated herein by reference. Wherever possible, common terminology is used. In addition, the drawings are not necessarily drawn to scale.

[0035] Figure 1 is a schematic diagram of a constituent block diagram of a load power supply circuit provided by an embodiment of the present application Figure 1 ;

[0036] Figure 2 is a schematic diagram of a constituent block diagram of a load power supply circuit provided by an embodiment of the present application Figure 2 ;

[0037] Figure 3 is a schematic diagram of a constituent block diagram of a load power supply circuit provided by an embodiment of the present application Figure 3 ;

[0038] Figure 4 is a schematic diagram of a circuit structure corresponding to the constituent block diagram shown in Figure 3 . DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, 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 should not be used to limit the present application.

[0040] It should be noted that when one element is described as being "connected" to another element, it can be directly connected to the other element or one or more intermediate elements can be present therebetween.

[0041] In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] Reference will be made to Figure 1 , Figure 1 is a schematic diagram of a constituent block diagram of a load power supply circuit provided by an embodiment of the present application. As shown in Figure 1 , the load power supply circuit 100 includes a rectification branch 10, a voltage regulation branch 20, a voltage detection branch 30, a switching branch 40 and a controller 50.

[0043] The rectification branch 10 is connected with the AC power supply VIN, that is, the first end of the rectification branch 10 is connected with the live wire L of the AC power supply VIN, and the second end of the rectification branch 10 is connected with the neutral wire N of the AC power supply VIN. The third end of the rectification branch 10 is connected with the first end of the voltage regulation branch 20, the first end of the voltage detection branch 30 and the load 200 at the first node P1. The second end of the voltage detection branch 30 and the first end of the switch branch 40 are connected with the controller 50. The second end of the switch branch 40 is connected with the neutral wire N of the AC power supply VIN, and the third end of the switch branch 40 is connected with the voltage regulation branch 20.

[0044] Specifically, the rectification branch 10 is configured to rectify the AC power supply VIN into a DC power supply and then output to the first node P1. The voltage detection branch 30 is configured to output a detection voltage to the controller 50 based on a first voltage, wherein the first voltage is the voltage value at the first node P1. The controller 50 is configured to output a first control signal to the switch branch 40 when the detection voltage is less than a first preset voltage. The first preset voltage is a voltage value set in advance, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations thereto. The switch branch 40 is configured to establish a connection between the neutral wire N of the AC power supply VIN and the voltage regulation branch 20 when receiving the first control signal, so that the voltage regulation branch 20 adjusts the voltage of the first node P1.

[0045] In some embodiments, the controller 50 is further configured to stop outputting the first control signal when the detection voltage is greater than or equal to the first preset voltage. The switch branch 40 is further configured to disconnect the connection between the neutral wire N of the AC power supply VIN and the voltage regulation branch 20 when not receiving the first control signal.

[0046] In actual application, when the AC power supply VIN is a city power supply with a voltage standard of 220V, the controller 50 determines that the detection voltage is greater than or equal to the first preset voltage. In this case, the controller 50 does not output the first control signal to the switch branch 40, and the connection between the neutral wire N of the AC power supply VIN and the voltage regulation branch 20 remains disconnected. The input power supply of 220V after rectification and filtering is the first voltage, which supplies power to the load 200. That is, the first voltage is obtained from the input power supply of 220V at this time.

[0047] When the AC power source VIN is the commercial power with the voltage standard of 110V, the corresponding controller 50 determines that the first voltage is less than the first preset voltage. In this case, the controller 50 outputs the first control signal to the switch branch 40, and then the connection between the neutral line N of the AC power source VIN and the voltage regulating branch 20 is established, so that the voltage regulating branch 20 adjusts the voltage at the first node P1, for example, adjusts the voltage at the first node P1, so that the first voltage is doubled. Therefore, although the first voltage is obtained from the input power source with 110V, and 110V is reduced to half relative to 220V, the first voltage after rectification and filtering is adjusted by the voltage regulating branch 20 and doubled, so that the voltage for supplying the load 200 remains basically unchanged.

[0048] In summary, no matter which country the household appliance including the load power supply circuit 100 is applied to, since the load power supply circuit 100 can adaptively adjust according to the commercial power, so that the voltage for supplying the load 200 remains basically unchanged, thereby maintaining the normal operation of the load 200. It can be seen that the household appliance including the load power supply circuit 100 can be applied to the commercial power with different voltage standards, so as to reduce the risk of damage of the household appliance including the load power supply circuit 100.

[0049] In the related art, for different countries, the household appliance suitable for the commercial power of the country is configured, and then when the household appliance with the voltage standard of 110V of the commercial power is exported to the country with the voltage standard of 220V of the commercial power (such as India) due to carelessness or the like, the risk of damage of the household appliance is relatively large. In the embodiment of the present application, since no matter which country the household appliance including the load power supply circuit 100 is applied to, the voltage for supplying the load 200 remains basically unchanged, the risk of damage of the household appliance is relatively low; secondly, one product can be applied to different countries, and unlike the related art, at least two different products need to be configured to be applied to countries with different voltage standards, the convenience and practicality of the embodiment of the present application are stronger.

[0050] In an embodiment, as shown in FIG. 1, the switch branch 40 includes a first switch unit 41 and a second switch unit 42. Figure 2

[0051] The first switch unit 41 is connected between the first power source VC1 and the second switch unit 42, and the second switch unit 42 is further connected between the neutral line N of the AC power source VIN and the voltage regulating branch 20.

[0052] ​Specifically, when the controller 50 outputs the first control signal to the first switch unit 41, the first switch unit 41 is turned on. The connection between the first power supply VCl and the second switch unit 42 is established, and the second switch unit 42 is powered and turned on. Then, the connection between the zero line N of the AC power supply VIN and the voltage regulating branch 20 is established.

[0053] When the controller 50 does not output the first control signal, the first switch unit 41 is turned off. The connection between the first power supply VCl and the second switch unit 42 is broken, and the second switch unit 42 is powered off and turned off. Then, the connection between the zero line N of the AC power supply VIN and the voltage regulating branch 20 is broken.

[0054] In an embodiment, as shown in Figure 3 , the switch branch 40 further comprises a third switch unit 43. The third switch unit 43 is connected between the second switch unit 42 and the ground GND, and the third switch unit 43 is connected with the controller 50.

[0055] Specifically, the first control signal comprises a first sub-control signal and a second sub-control signal. When the controller 50 simultaneously outputs the first sub-control signal and the second sub-control signal, on the one hand, the first sub-control signal is input to the first switch unit 41 to turn on the first switch unit 41; on the other hand, the second sub-control signal is input to the third switch unit 43 to turn on the third switch unit 43. In this case, the first power supply VCl, the first switch unit 41, the second switch unit 42, the third switch unit 43 and the ground GND form a loop, and the second switch unit 42 is powered on and turned on. Then, the connection between the zero line N of the AC power supply VIN and the voltage regulating branch 20P2 is established.

[0056] When the controller 50 outputs at most one of the first sub-control signal and the second sub-control signal (i.e. the controller 50 does not simultaneously output the first sub-control signal and the second sub-control signal), one of the first switch unit 41 and the third switch unit 42 is turned on or both are not turned on. In this case, no loop is formed to power the second switch unit 42, and the second switch unit 42 is powered off and turned off. Then, the connection between the zero line N of the AC power supply VIN and the voltage regulating branch 20 is broken.

[0057] In this embodiment, by respectively setting the first switch unit 41 and the second switch unit 42, it can be prevented that the second switch unit 42 is mistakenly turned on due to the mistaken turn-on of one of them, and the stability and reliability of the circuit operation can be improved.

[0058] Please refer to Figure 4 , Figure 4 for an exemplary circuit structure corresponding to the block diagram shown in Figure 3 . As shown in Figure 4As shown, the rectification branch 10 includes a rectifier bridge U1.

[0059] The first end of the rectifier bridge U1 is connected with the live wire L of the AC power supply V IN, the second end of the rectifier bridge U1 is connected with the neutral wire N of the AC power supply V IN and the switching branch 40, the third end of the rectifier bridge U1 is connected to the first node P1, and the fourth end of the rectifier bridge U1 is grounded GND.

[0060] Specifically, the rectifier bridge U1 is used to realize full-wave rectification.

[0061] In this embodiment, the voltage regulation branch 20 includes a first capacitor C1, a second capacitor C2, a first resistor R1 and a second resistor R2.

[0062] The first capacitor C1 and the second capacitor C2 are connected in series between the first node P1 and the ground GND, the first capacitor C1 and the second capacitor C2 are connected to the second node P2, the first resistor R1 and the second resistor R2 are connected in series between the first node P1 and the ground GND, and the first resistor R1 and the second resistor R2 are connected to the second node P2.

[0063] Specifically, the first capacitor C1 and the second capacitor C2 are both bus capacitors. The first resistor R1 and the second resistor R2 are used to provide a discharge circuit for the first capacitor C1 and the second capacitor C2.

[0064] In this embodiment, the voltage detection branch 30 includes a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4 and a first diode D1.

[0065] The third resistor R3 and the fourth resistor R4 are connected in series between the first node P1 and the ground GND, the third capacitor C3 is connected in parallel with the fourth resistor R4 and the fourth capacitor C4, the connection points between the third resistor R3 and the fourth resistor R4 are respectively connected with the anode of the first diode D1 and the controller 50, and the cathode of the first diode D1 is connected with the second power supply VC2.

[0066] Specifically, the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, the third resistor R3 and the fourth resistor R4 divide the first voltage, and the voltage divided by the fourth resistor R4 is the detection voltage. The third capacitor C3 and the fourth capacitor C4 are filter capacitors. The first diode D1 is used for clamping to prevent the detection voltage input to the controller 50 from being too large to damage the controller 50.

[0067] In this embodiment, the first switch unit 41 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a first switch tube Q1.

[0068] The fifth resistor R5 and the sixth resistor R6 are connected in series between the controller 50 and the ground GND, the connection point between the fifth resistor R5 and the sixth resistor R6 is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is grounded to the ground GND, the third end of the first switch tube Q1 is connected to the first end of the second switch tube Q2 through the seventh resistor R7, the eighth resistor R8 is connected between the first end and the second end of the second switch tube Q2, the second end of the second switch tube Q2 is grounded to the ground GND, and the third end of the second switch tube Q2 is connected to the second switch unit 42.

[0069] Specifically, the fifth resistor R5 and the sixth resistor R6 divide the voltage of the first sub-control signal, and the voltage division of the first sub-control signal on the sixth resistor R6 drives the first switch tube Q1 to turn on. The sixth resistor R6 can also play a role in discharging the electric quantity when the first switch tube Q1 is turned off, ensuring that the first switch tube Q1 is reliably turned off.

[0070] After the first switch tube Q1 is turned on, the seventh resistor R7 and the eighth resistor R8 divide the voltage of the first power supply VC1, and the voltage division of the first power supply VC1 on the eighth resistor R8 drives the second switch tube Q2 to turn on. The eighth resistor R8 can also play a role in discharging the electric quantity when the second switch tube Q2 is turned off, ensuring that the second switch tube Q2 is reliably turned off.

[0071] In this embodiment, the first switch tube Q1 is an NPN type triode, and the second switch tube Q2 is a PNP type triode. Among them, the base of the triode is the first end of the first switch tube Q1 (and the second switch tube Q2), the emitter of the triode is the second end of the first switch tube Q1 (and the second switch tube Q2), and the collector of the triode is the third end of the first switch tube Q1 (and the second switch tube Q2).

[0072] In addition, the first switch tube Q1 and the second switch tube Q2 can be any controllable switch, such as 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.

[0073] In this embodiment, the second switch unit 42 includes a relay U2, a second diode D2, and a ninth resistor R9, wherein the relay U2 includes a coil KM and a pair of normally open contacts S1.

[0074] Among them, the first end of the coil KM is respectively connected to the cathode of the second diode D2 and the first switch unit 41, the second end of the coil KM is respectively connected to the anode of the second diode D2 and the first end of the ninth resistor R9, the second end of the ninth resistor R9 is grounded GND, the first contact of the pair of normally open contacts S1 is connected to the neutral line N of the AC power supply VIN, and the second contact of the pair of normally open contacts S1 is connected to the voltage regulating branch 20.

[0075] Specifically, the ninth resistor R9 is a current limiting resistor. The second diode D2 is a freewheeling diode.

[0076] In this embodiment, the third switch unit 43 includes a tenth resistor R10 , an eleventh resistor R11 , and a third switch tube Q3 .

[0077] The tenth resistor R10 and the eleventh resistor R11 are connected in series between the controller 50 and the ground GND. The connection point between the tenth resistor R10 and the eleventh resistor D11 is connected to the first end of the third switch tube Q3. The second end of the third switch tube Q3 is connected to the ground GND. The third end of the third switch tube Q3 is connected to the second switch unit 42.

[0078] Specifically, the tenth resistor R10 and the eleventh resistor R11 divide the voltage of the second sub-control signal. The voltage of the second sub-control signal divided by the eleventh resistor R11 drives the third switch Q3 to conduct. The eleventh resistor R11 also serves to discharge the discharge when the third switch Q3 is turned off, ensuring that the third switch Q3 is reliably turned off.

[0079] In this embodiment, the third switch Q3 is an NPN transistor, wherein the base of the transistor is the first terminal of the third switch Q3, the emitter of the transistor is the second terminal of the third switch Q3, and the collector of the transistor is the third terminal of the third switch Q3.

[0080] In addition, the third switch tube Q3 can be any controllable switch, such as 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.

[0081] The following Figure 4 The principle of the circuit structure shown is explained. In this embodiment, when the voltage standard is 220V, the voltage during actual power supply is usually between 220V and 240V; and when the voltage standard is 110V, the voltage during actual power supply is usually between 100V and 120V.

[0082] When the AC power source VIN is the commercial power with a voltage standard of 220V, the AC power source VIN is in a voltage range of [220*√2, 240*√2] after rectification by the rectifier bridge 10, wherein √2≈1.414. Then, the first preset voltage can be set based on the voltage range, for example, the voltage on the fourth resistor R4 after the voltage of 220*√2 is divided by the third resistor R3 and the fourth resistor R4 is set as the first preset voltage, so that the controller 50 can more quickly identify that the current AC power source VIN is the commercial power with a voltage standard of 220V. Secondly, the voltage after the rectifier U1 can fluctuate, so a coefficient can be added to the corresponding voltage, for example, the first preset voltage can be set as the voltage on the fourth resistor R4 after the voltage of 220*0.8*√2 is divided by the third resistor R3 and the fourth resistor R4, so as to further improve the sensitivity. On this basis, when the controller 50 receives the detection voltage and determines that the detection voltage is greater than the first preset voltage based on the detection voltage, the controller 50 does not output the first sub-control signal to the first switch tube Q1, and does not output the second sub-control signal to the third switch tube Q3, and the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 are all turned off. The coil KM of the relay U2 loses power, and a pair of normally open contacts S1 of the relay U2 remains open, and the connection between the zero line N of the AC power source VIN and the second node P2 remains open. The input power source with a voltage of 220V is rectified and filtered to be a first voltage, and the first voltage is in the above-mentioned voltage range, for example, when the voltage of the input power source VIN is 220V, the corresponding first voltage is 220*√2. The first voltage supplies power for the load 200, and the load 200 can operate normally.

[0083] When the AC power source VI N is a mains power source with a voltage standard of 110V, the AC power source VI N is in the voltage range of [100*√2, 120*√2] after being rectified by the rectifier bridge 10. Subsequently, a first preset voltage can be set based on the above voltage range. For example, the voltage divided by the third resistor R3 and the fourth resistor R4 after the result of 120*√2 is set as the first preset voltage, so that the controller 50 can more quickly identify that the current AC power source VI N is a mains power source with a voltage standard of 110V. Secondly, the voltage after passing through the rectifier bridge U1 may fluctuate, so a coefficient can be added to the corresponding voltage. For example, the first preset voltage can be set as the voltage divided by the third resistor R3 and the fourth resistor R4 after the result of 120*1.2*√2 is divided by the fourth resistor R4 to further improve sensitivity. On this basis, when the controller 50 receives the detection voltage and determines that the detection voltage is less than the first preset voltage, it outputs a first sub-control signal to the first switch Q1 and a second sub-control signal to the third switch Q3, turning on the first, second, and third switches Q1, Q2, and Q3. Simultaneously, the coil KM of the relay U2 is energized, the pair of normally open contacts S1 of the relay U2 closes, and the neutral line N of the AC power source VI N is connected to the second node P2 via the pair of normally open contacts S1 of the relay U2. At this point, the voltage value of the first node P1 is adjusted by the voltage regulating branch 20, thereby doubling the first voltage. That is, the 110V input power, after rectification and filtering, becomes the first voltage, which is twice the aforementioned voltage range. For example, when the voltage of the input power source VI N is 110V, the corresponding first voltage is 110*2*√2. The first voltage supplies power to the load 200, and the first voltage supplying power to the load 200 at this time is equal to the first voltage supplying power to the load 200 when the AC power source VI N is a commercial power with a voltage standard of 220V, and the load 200 can operate normally.

[0084] In summary, regardless of the country in which the household appliance including the load power supply circuit 100 is used, since the load power supply circuit 100 can adaptively adjust according to the voltage of the mains power, so that the voltage supplied to the load 200 remains substantially unchanged, the normal operation of the load 200 can be maintained. It can be seen that the household appliance including the load power supply circuit 100 can be adapted to mains power of different voltage standards, thereby reducing the risk of damage to the household appliance including the load power supply circuit 100.

[0085] An embodiment of the present application further provides a household appliance, which includes the load power supply circuit 100 in any embodiment of the present application.

[0086] In some embodiments, the household appliance is an inverter refrigerator, and the load 200 includes a compressor in the inverter refrigerator.

[0087] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

[0088] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; 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 load power supply circuit characterized by comprising: The load power supply circuit comprises: a voltage regulating branch, a voltage detecting branch, a switch branch and a controller; the voltage regulating branch, the voltage detecting branch and a load are connected to a first node, the voltage detecting branch and the switch branch are connected to the controller, the switch branch is connected to a zero line of an alternating current power supply and the voltage regulating branch; the voltage detecting branch is configured to output a detecting voltage to the controller based on a first voltage, wherein the first voltage is a voltage value at the first node; the controller is configured to output a first control signal to the switch branch when the detecting voltage is less than a first preset voltage; the switch branch is configured to establish a connection between the zero line of the alternating current power supply and the voltage regulating branch when the first control signal is received, so that the voltage regulating branch adjusts the voltage value of the first node.

2. The load supply circuit according to claim 1, wherein the switch branch comprises a first switch unit and a second switch unit; the first switch unit is connected to the controller, and is further connected between a first power supply and the second switch unit; the second switch unit is further connected between the zero line of the alternating current power supply and the voltage regulating branch; the first switch unit is configured to be turned on when the first control signal is received, so as to establish a connection between the first power supply and the second switch unit, and is configured to be turned off when the first control signal is not received, so as to disconnect the connection between the first power supply and the second switch unit; the second switch unit is configured to be turned on when it is connected to the first power supply, so as to establish a connection between the zero line of the alternating current power supply and the voltage regulating branch, and is configured to be turned off when it is disconnected from the first power supply, so as to disconnect the connection between the zero line of the alternating current power supply and the voltage regulating branch.

3. The load supply circuit of claim 2, wherein, the switch branch further comprises a third switch unit, the third switch unit is connected between the second switch unit and the ground, and the third switch unit is connected to the controller; the first switch unit is further configured to be turned on when a first sub-control signal is received, so as to establish a connection between the first power supply and the second switch unit, and is configured to be turned off when the first sub-control signal is not received, so as to disconnect the connection between the first power supply and the second switch unit, wherein the first control signal comprises the first sub-control signal and a second sub-control signal; the third switch unit is configured to be turned on when a second sub-control signal is received, so as to establish a connection between the second switch unit and the ground, and is configured to be turned off when the second sub-control signal is not received, so as to disconnect the connection between the second switch unit and the ground; the second switch unit is further configured to be turned on when it is connected to the first power supply and the ground, so as to establish a connection between the zero line of the alternating current power supply and the voltage regulating branch, and is configured to be turned off when it is disconnected from at least one of the first power supply and the ground, so as to disconnect the connection between the zero line of the alternating current power supply and the voltage regulating branch.

4. The load supply circuit of claim 1, wherein, the load power supply circuit further comprises a rectification branch, the rectification branch is connected to the alternating current power supply and the voltage regulating branch; the rectification branch comprises a rectifier bridge; The first end of the rectifier bridge is connected with the live wire of the AC power supply, the second end of the rectifier bridge is connected with the zero line of the AC power supply and the switch branch, the third end of the rectifier bridge is connected with the first node, and the fourth end of the rectifier bridge is grounded.

5. The load supply circuit of claim 1, wherein, The voltage regulating branch comprises a first capacitor, a second capacitor, a first resistor and a second resistor. The first capacitor and the second capacitor are connected in series between the first node and the ground, the first capacitor and the second capacitor are connected to a second node, the first resistor and the second resistor are connected in series between the first node and the ground, and the first resistor and the second resistor are connected to the second node.

6. The load supply circuit of claim 1, wherein, The voltage detecting branch comprises a third resistor, a fourth resistor, a third capacitor, a fourth capacitor and a first diode. The third resistor and the fourth resistor are connected in series between the first node and the ground, the third capacitor and the fourth resistor and the fourth capacitor are connected in parallel, the connection point between the third resistor and the fourth resistor is connected with the anode of the first diode and the controller respectively, and the cathode of the first diode is connected with a second power supply.

7. The load supply circuit of claim 2, wherein, The first switch unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switch tube and a second switch tube. The fifth resistor and the sixth resistor are connected in series between the controller and the ground, the connection point between the fifth resistor and the sixth resistor is connected with the first end of the first switch tube, the second end of the first switch tube is grounded, the third end of the first switch tube is connected with the first end of the second switch tube through the seventh resistor, the eighth resistor is connected between the first end and the second end of the second switch tube, the second end of the second switch tube is grounded, and the third end of the second switch tube is connected with the second switch unit.

8. The load supply circuit of claim 2, wherein, The second switch unit comprises a relay, a second diode and a ninth resistor, wherein the relay comprises a coil and a pair of normally open contacts. The first end of the coil is connected with the cathode of the second diode and the first switch unit respectively, the second end of the coil is connected with the anode of the second diode and the first end of the ninth resistor respectively, the second end of the ninth resistor is grounded, the first contact of the pair of normally open contacts is connected with the zero line of the AC power supply, and the second contact of the pair of normally open contacts is connected with the voltage regulating branch.

9. The load supply circuit of claim 3, wherein, The third switch unit comprises a tenth resistor, an eleventh resistor and a third switch tube. The tenth resistor and the eleventh resistor are connected in series between the controller and the ground, the connection point between the tenth resistor and the eleventh resistor is connected with the first end of the third switch tube, the second end of the third switch tube is grounded, and the third end of the third switch tube is connected with the second switch unit.

10. A domestic appliance characterized in that, The load power supply circuit comprises any one of claims 1-9.

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