Power supply circuit of refrigerator and refrigerator
By introducing a type judgment module and a voltage conversion module into the refrigerator power supply circuit, the problem that the refrigerator power supply circuit cannot adapt to multiple power supplies is solved, and the effect of improving the universality of the refrigerator is achieved.
Patent Information
- Application Number
- CN202311161947.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-08
- Publication Date
- 2025-03-11
AI Technical Summary
The refrigerator power supply circuit cannot be adapted to multiple power supplies at the same time, resulting in the need to replace accessories, increase workload and reduce the versatility of the refrigerator.
A refrigerator power supply circuit is designed, including a type judgment module and a voltage conversion module. The type judgment module determines the type of power supply. The voltage conversion module selects the corresponding voltage conversion unit according to the type of power supply, converts the voltage of the power supply to output the working voltage of the refrigerator.
It realizes that multiple power supplies can be adapted to the refrigerator without changing the refrigerator accessories, improves the versatility of the refrigerator, and converts multiple power supplies into voltages that meet the refrigerator's working voltage.
Smart Images
Figure CN119602589A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of refrigerator power supply circuits, and in particular, relates to a refrigerator power supply circuit and a refrigerator. Background Art
[0002] At present, the specifications of mains electricity in different countries or regions are different. For example, the mains electricity in some countries or regions is AC 220-240V, and the mains electricity in some countries or regions is AC 100-120V. In order to meet the mains power supply requirements of various places, it is usually necessary to replace the power supply-related accessories in the refrigerator, resulting in a large workload and a low level of universality of the refrigerator. Summary of the invention
[0003] The object of the present invention is to provide a power supply circuit for a refrigerator and a refrigerator, so as to solve the problem that the power supply circuit for the refrigerator cannot adapt to multiple power sources at the same time.
[0004] According to one aspect of an embodiment of the present application, there is provided a power supply circuit for a refrigerator, comprising:
[0005] A type determination module, used to connect to a power supply and determine the power type of the power supply, which includes an AC power supply and a DC power supply;
[0006] The voltage conversion module includes multiple voltage conversion units, which are connected to the type judgment module and are used to determine the target voltage conversion unit according to the power type of the power supply, and convert the voltage of the power supply through the target voltage conversion unit to output the working voltage of the refrigerator.
[0007] In an embodiment provided in the present application, the power supply type includes a low-voltage AC power supply; the voltage conversion module includes: a first voltage conversion unit, which is used to increase the voltage of the power supply to the working voltage of the refrigerator when the power supply is a low-voltage AC power supply.
[0008] In an embodiment provided in the present application, the voltage conversion module includes: a second voltage conversion unit, which is used to adjust the DC voltage of the power supply to the AC working voltage of the refrigerator when the power supply is a DC power supply.
[0009] In an embodiment provided in the present application, the type judgment module includes: a first type judgment unit and a second type judgment unit; the first type judgment unit is used to connect to a power supply, and output a first judgment signal according to the power type of the power supply, and the first judgment signal is used to indicate whether the power supply is an AC power supply or a DC power supply; the second type judgment unit is connected to the first type judgment unit, and is used to output a second judgment signal according to the voltage of the power supply when the first judgment signal indicates that the power supply is an AC power supply; the second judgment signal is used to indicate whether the power supply is a high-voltage AC power supply or a low-voltage AC power supply.
[0010] In an embodiment provided in the present application, a first type judgment unit includes: a first diode, a first capacitor and a first switch tube; the anode of the first diode is used to connect to the power supply, and the cathode of the first diode is connected to the first end of the first capacitor; the second end of the first capacitor is connected to the control end of the first switch tube; the first end of the first switch tube is connected to the working power supply, and the first end of the first switch tube is used to output a first judgment signal; the second end of the first switch tube is grounded.
[0011] In an embodiment provided in the present application, the first switching tube includes a light-emitting diode and an optical switch tube; the anode of the light-emitting diode is connected to the second end of the first capacitor; the first end of the optical switch tube is connected to the working voltage, and the second end of the optical switch tube is grounded, and the optical switch tube is used to turn on or off according to the light-emitting state of the light-emitting diode.
[0012] In an embodiment provided in the present application, the first type judgment unit also includes: a first switch, arranged between the power supply and the first diode, used to close when the refrigerator is connected to the power supply and disconnect when the refrigerator is not connected to the power supply.
[0013] In an embodiment provided in the present application, the second type judgment unit includes: a transformer, a third diode, a second capacitor and a second switch tube; the side where the primary winding of the transformer is located is connected to the first type judgment unit; the side where the secondary winding of the transformer is located is connected to the anode of the third diode; the cathode of the third diode is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the control end of the second switch tube; the first end of the second switch tube is connected to the working voltage, and the first end of the second switch tube is used to output the second judgment signal; the second end of the second switch tube is grounded.
[0014] In an embodiment provided in the present application, the second type judgment unit further includes: a second switch, which is arranged between the first type judgment unit and the transformer, and is used to close or open according to the first judgment signal.
[0015] According to one aspect of an embodiment of the present application, a refrigerator is provided, comprising: a power supply circuit of the refrigerator provided by any embodiment of the present application.
[0016] In the technical solution of the present application, the power supply circuit of the refrigerator determines the power type of the power supply through a type judgment module, where the power type includes AC power supply and DC power supply; then the power type of the power supply is transmitted to the voltage conversion module, and the voltage conversion module determines the target voltage conversion unit according to the power type of the power supply, and converts the voltage of the power supply through the target voltage conversion unit to output the working voltage of the refrigerator, so that a variety of power supplies can be adapted without replacing accessories in the refrigerator, and a variety of power supplies can be converted to meet the working voltage of the refrigerator, thereby improving the versatility of the refrigerator.
[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0019] Figure 1 A schematic diagram of the structure of a power supply circuit of a refrigerator provided in an embodiment of the present application is shown schematically.
[0020] Figure 2 A schematic diagram of the structure of a power supply circuit of a refrigerator provided in an embodiment of the present application is shown schematically.
[0021] Figure 3 The structural diagram of the first type judgment unit provided by an embodiment of the present application is schematically shown.
[0022] Figure 4 The structural diagram of the first type judgment unit provided by an embodiment of the present application is schematically shown.
[0023] Figure 5 The structural diagram of the second type judgment unit provided by an embodiment of the present application is schematically shown.
[0024] Figure 6 A schematic diagram of the structure of a power supply circuit of a refrigerator provided in an embodiment of the present application is shown schematically.
[0025] Figure 7 The structural diagram of a refrigerator provided by an embodiment of the present application is schematically shown. DETAILED DESCRIPTION
[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.
[0027] like Figure 1As shown, the present application provides a power supply circuit for a refrigerator, including: a type judgment module 110 and a voltage conversion module 120, and the voltage conversion module 120 is connected to the type judgment module 110. The type judgment module 110 is used to connect to the power supply 200 and judge the power type of the power supply 200, and the power type includes AC power supply and DC power supply. The voltage conversion module 120 includes a plurality of voltage conversion units, and the voltage conversion module 120 is used to determine a target voltage conversion unit according to the power type of the power supply 200, and convert the input voltage of the power supply 200 through the target voltage conversion unit to output the working voltage of the refrigerator.
[0028] Specifically, when the type judgment module 110 is connected to the power supply 200, assuming that the power supply 200 provides an input voltage, the power supply 200 transmits the input voltage to the type judgment module 110, and the type judgment module 110 judges the power type of the power supply 200 to determine whether the power supply 200 is an AC power supply or a DC power supply. When the input voltage provided by the power supply 200 is an AC voltage, the target voltage conversion unit corresponding to the AC voltage in the voltage conversion module 120 is selected; when the input voltage provided by the power supply 200 is a DC voltage, the target voltage conversion unit corresponding to the DC voltage in the voltage conversion module 120 is selected, so that the input voltage provided by the power supply 200 is converted into a working voltage that meets the refrigerator through the target voltage conversion unit corresponding to the power type. Assuming that the working voltage of the refrigerator is an AC voltage, the voltage conversion module 120 needs to convert the received DC voltage to output an AC voltage that meets the working voltage of the refrigerator; or when the voltage value of the AC voltage provided by the power supply 200 does not meet the voltage value of the working voltage of the refrigerator, the voltage conversion module 120 is also required to convert the voltage value of the received AC voltage so that the voltage value of the output AC voltage meets the voltage value of the working voltage of the refrigerator.
[0029] In the technical solution of the present application, the power supply circuit of the refrigerator determines the power type of the power supply through a type judgment module, where the power type includes AC power supply and DC power supply; then the power type of the power supply is transmitted to the voltage conversion module, and the voltage conversion module determines the target voltage conversion unit according to the power type of the power supply, and converts the voltage of the power supply through the target voltage conversion unit to output the working voltage of the refrigerator, so that a variety of power supplies can be adapted without replacing accessories in the refrigerator, and a variety of power supplies can be converted to meet the working voltage of the refrigerator, thereby improving the versatility of the refrigerator.
[0030] In one embodiment provided in the present application, Figure 2As shown, the type judgment module 110 includes: a first type judgment unit 111 and a second type judgment unit 112; the input end of the first type judgment unit 111 is used to connect with the power supply 200, and output a first judgment signal according to the power type of the power supply 200, and the first judgment signal is used to indicate whether the power supply 200 is an AC power supply or a DC power supply; the input end of the second type judgment unit 112 is connected to the output end of the first type judgment unit 111, and is used to output a second judgment signal according to the voltage of the power supply 200 when the first judgment signal indicates that the power supply 200 is an AC power supply; the second judgment signal is used to indicate whether the power supply 200 is a high-voltage AC power supply or a low-voltage AC power supply.
[0031] Specifically, the first type judgment unit 111 outputs a first judgment signal according to the power type of the power supply 200. For example, when the power supply 200 is an AC power supply, the first judgment signal output by the first type judgment unit 111 is "0"; when the power supply 200 is a DC power supply, the first judgment signal is "1". The working state of the second type judgment unit 112 is determined according to the state of the first judgment signal. For example, when the second type judgment unit 112 obtains the first judgment signal as "1", it does not perform type judgment; when the first judgment signal is "0", the second type judgment unit 112 outputs a second judgment signal according to the voltage value of the power supply 200. The voltage conversion module 120 determines the power type of the power supply 200 by obtaining the first judgment signal and the second judgment signal, and determines the target voltage conversion unit according to the power type of the power supply 200.
[0032] Alternatively, the first judgment signal is obtained through the control module in the refrigerator, and it is determined whether the second type judgment unit 112 is required to further judge the power type of the power supply 200 according to the first judgment signal. When the first judgment signal obtained by the control module is "0", the second type judgment unit 112 is controlled to judge the power type of the power supply 200, and the second judgment signal output by the second type judgment unit 112 is obtained; then the power type of the power supply 200 is determined according to the second judgment signal; finally, the power supply 200 is controlled to input the target voltage conversion unit according to the power type of the power supply 200, so that the input voltage of the power supply 200 is converted by the target voltage conversion unit.
[0033] It should be understood that the high-voltage AC power supply and low-voltage AC power supply in the present application are relative to the working voltage of the refrigerator. When the voltage value of the AC power supply is greater than or equal to the voltage value of the working voltage of the refrigerator, the power supply 200 is determined to be a high-voltage AC power supply; when the voltage value of the AC power supply is less than the voltage value of the working voltage of the refrigerator, the power supply 200 is determined to be a low-voltage AC power supply. For example, when the working voltage of the refrigerator is AC 220-240V, when the power supply 200 provides AC 100-120V, the power supply 200 is determined to be an AC power supply through the first type judgment unit 111, and then the AC power supply is determined to be a low-voltage AC power supply through the second type judgment unit 112. When the working voltage of the refrigerator is AC 220-240V, when the power supply 200 provides AC 220-240V, the power supply 200 is determined to be an AC power supply through the first type judgment unit 111, and then the AC power supply is determined to be a high-voltage AC power supply through the second type judgment unit 112.
[0034] In one embodiment provided in the present application, Figure 3 As shown, the first type judgment unit 111 includes: a first diode D1, a first capacitor C1 and a first switch tube Q1; the anode of the first diode D1 is used to connect to the power supply 200, and the cathode of the first diode D1 is connected to the first end of the first capacitor C1; the second end of the first capacitor C1 is connected to the control end of the first switch tube Q1, and the control end of the first switch tube Q1 is connected to one end of the resistor R1; the first end of the first switch tube Q1 is connected to the resistor R2 and then to the working power supply VDD, the first end of the first switch tube Q1 is connected to one end of the resistor R3, and the other end of the resistor R3 outputs the first judgment signal U1; the second end of the first switch tube Q1 is grounded.
[0035] Specifically, since the first capacitor C1 blocks direct current and passes alternating current, when the power supply 200 is a direct current power supply, the signal received by the control end of the first switch tube Q1 is "0". If the first switch tube Q1 is cut off when the control end is at a low level, the first judgment signal U1 output by the first end of the first switch tube Q1 is "1"; when the power supply 200 is an alternating current power supply, the signal received by the control end of the first switch tube Q1 is "1". If the first switch tube Q1 is turned on when the control end is at a high level, the first judgment signal U1 output by the first end of the first switch tube Q1 is at a low level. It can be seen that by turning on or off the first switch tube Q1 according to the power type of the power supply 200, the first judgment signal U1 can be obtained from the first end of the first switch tube Q1, and the voltage of the first judgment signal U1 corresponds to the power type of the power supply 200. It should be understood that the first switch tube Q1 can also be turned on when the control terminal is at a low level, and turned off when the control terminal is at a high level. Accordingly, when the first judgment signal U1 is at a low level, the power supply 200 is a DC power supply, and when the first judgment signal U1 is at a high level, the power supply 200 is an AC power supply. In addition, the resistors R1, R2, and R3 are used to protect the power supply circuit to prevent excessive current in the circuit.
[0036] In one embodiment provided in the present application, Figure 3 As shown, the first type determination unit 111 further includes: a first switch K1, which is arranged between the power supply 200 and the first diode D1, and is used to be closed when the refrigerator is connected to the power supply 200, and to be opened when the refrigerator is not connected to the power supply 200. By controlling the first switch K1 to be closed or opened, it is possible to control whether the power supply circuit of the present application is working, thereby controlling whether the refrigerator is working.
[0037] It should be understood that in addition to setting the first switch K1 to be closed or opened depending on whether the refrigerator and the power supply 200 are connected, the first switch K1 can also be set to be closed or opened by the user. For example, when the user connects the refrigerator to the power supply 200 and closes the first switch K1, the input voltage provided by the power supply 200 is input into the power supply circuit in the present application.
[0038] In one embodiment provided in the present application, Figure 4 As shown, the first switch tube Q1 can be replaced by a light-emitting diode D0 and an optical switch tube Q0, the anode of the light-emitting diode D0 is connected to the second end of the first capacitor C1, and the cathode of the light-emitting diode D0 is connected to the resistor R1; the first end of the optical switch tube Q0 is connected to the operating voltage VDD, and the second end of the optical switch tube Q0 is grounded, and the optical switch tube Q0 is used to turn on or off according to the light-emitting state of the light-emitting diode D0.
[0039] Specifically, the first switch tube Q1 in the present application can be replaced by a light-emitting diode D0 and an optical switch tube Q0. When the light-emitting diode D0 emits light, the optical switch tube Q0 is turned on, and when the light-emitting diode D0 does not emit light, the optical switch tube Q0 is turned off. When the power supply 200 is an AC power supply, the first capacitor C1 discharges so that the light-emitting diode D0 is turned on and emits light, and the optical switch tube Q0 is turned on, then the first judgment signal U1 is a low level. When the power supply 200 is a DC power supply, the first capacitor C1 cannot be discharged, so the light-emitting diode D0 is turned off and does not emit light, then the optical switch tube Q0 is turned off, and then the first judgment signal U1 is a high level. Therefore, the function of the first switch tube in the present application being turned on or off according to the power type of the power supply 200 can also be realized by the light-emitting diode D0 and the optical switch tube Q0, and at the same time, it acts as an isolation device to protect the power supply circuit.
[0040] In an embodiment provided in the present application, the second type judgment unit includes: a transformer, a third diode, a second capacitor and a second switch tube; the side where the primary winding of the transformer is located is connected to the first type judgment unit; the side where the secondary winding of the transformer is located is connected to the anode of the third diode; the cathode of the third diode is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the control end of the second switch tube; the first end of the second switch tube is connected to the working voltage, and the first end of the second switch tube is used to output the second judgment signal; the second end of the second switch tube is grounded.
[0041] For example, Figure 5 As shown, the second type judgment unit includes: a transformer T1, a second diode D2, a second capacitor C2, a light emitting diode D3 and a light switch Q2; the side where the primary winding of the transformer T1 is located is connected to the first type judgment unit 111; the side where the secondary winding of the transformer T1 is located is connected to the anode of the second diode D2; the cathode of the second diode D2 is connected to the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the anode of the light emitting diode D3, the cathode of the light emitting diode D3 is connected to the resistor R4, and the light emitting state of the light emitting diode D3 is used to control the light switch Q2 to be turned on or off; the first end of the light switch Q2 is connected to the resistor R5 and then to the working voltage VDD, the first end of the light switch Q2 is connected to one end of the resistor R6, and the other end of the resistor R6 is used to output the second judgment signal U2; the second end of the light switch Q2 is grounded.
[0042] When the input voltage U 供When it is high-voltage AC, the high-voltage AC is converted into AC of a preset voltage through transformer T1, and when the voltage U3 on the side where the secondary winding of transformer T1 is located is greater than or equal to the preset voltage, the second diode D2 is turned on, and when the voltage U3 on the side where the secondary winding of transformer T1 is located is less than the preset voltage, the second diode D2 is turned off. Since the second capacitor C2 blocks direct current and passes alternating current, when the second diode D2 is turned on, the optical switch Q2 is turned on, so that the second judgment signal U2 is low level; and when the second diode D2 is turned off, the optical switch Q2 remains in the off state, and the second judgment signal U2 is high level at this time. Therefore, when the second judgment signal U2 is obtained as a low level, it is determined that the power supply is a high-voltage AC power supply at this time; when the second judgment signal U2 is obtained as a high level, it is determined that the power supply is a low-voltage AC power supply at this time.
[0043] It should be understood that Figure 5 The primary winding and the secondary winding of the transformer T1 are only schematic diagrams of the transformer, and do not represent the proportional relationship between the primary winding and the secondary winding of the transformer. In addition, the resistors R4, R5 and R6 are used to protect the power supply circuit to prevent excessive current in the circuit.
[0044] In an embodiment provided in the present application, the second type judgment unit further includes: a second switch K2, which is arranged between the first type judgment unit 111 and the transformer T1, and is used to close or open according to the first judgment signal U1. The second switch K2 can isolate the direct current from the second type judgment unit 112 to prevent the direct current from being input into the second type judgment unit 112 and affecting the judgment result of the power type. For example, the second switch K2 can be set as a switch tube, and the control end of the switch tube is used to receive the first judgment signal U1, so that the second switch K2 can be turned on or off according to the first judgment signal U1.
[0045] In one embodiment provided in the present application, Figure 6 As shown, the voltage conversion module includes: a first voltage conversion unit 121, which is used to increase the input voltage U provided by the power supply 200 to the working voltage of the refrigerator when the power supply 200 is a low-voltage AC power supply. Assume that the working voltage of the refrigerator is AC 220-240V, and the input voltage U provided by the power supply is 供 When it is determined that the power supply is a low-voltage AC power supply, the input voltage U 供 From 100-120 V to 220-240 V. It can be seen that the first voltage conversion unit 121 is a boost unit, for example, an AC boost unit can be used, or an AC-to-DC converter can be used to boost the DC and then convert the boosted DC into AC.
[0046] In one embodiment provided in the present application, Figure 6 As shown, the voltage conversion module also includes: a second voltage conversion unit 122, which is used to adjust the DC voltage provided by the power supply 200 to the AC working voltage of the refrigerator when the power supply 200 is a DC power supply. Assume that the working voltage of the refrigerator is AC 220-240V, and the input voltage of the power supply 200 is DC 48V. When the type judgment module 110 determines that the power supply 200 is a DC power supply, the voltage of the power supply 200 is converted from DC 48V to AC 220-240V through the second voltage conversion unit 122. It can be seen that the second voltage conversion unit 122 is an inverter circuit, for example, it can boost DC 48V to DC 220-240V, and then convert DC 220-240V to AC 220-240V.
[0047] In another embodiment, the power supply 200 is a high-voltage AC power supply, for example, the working voltage of the refrigerator is AC 220-240V, and the power supply 200 is AC 310-330V, and the third voltage conversion unit in the voltage conversion module is used to reduce the voltage of the high-voltage AC power supply to the working voltage of the refrigerator. Or if the power supply 200 is AC 220-240V, there is no need to convert the voltage of the power supply 200, or in order to prevent the voltage fluctuation of the power supply from damaging the components of the refrigerator, the voltage conversion module includes a voltage stabilizing unit to stabilize the voltage of the power supply at the working voltage of the refrigerator to ensure the normal operation of the refrigerator.
[0048] like Figure 7 As shown, the present application provides a refrigerator, including: the power supply circuit of the refrigerator provided by any embodiment of the present application; and a DC power supply module 701, which is connected to the type judgment module 702 and the voltage conversion module 703, and is used to provide a working voltage to the type judgment module 702 and the voltage conversion module 703 when the refrigerator is not connected to an AC power supply, and to serve as a power supply for the refrigerator; when the refrigerator is connected to an AC power supply, it stores the electrical energy provided by the AC power supply.
[0049] Specifically, the DC power module 701 can be arranged inside the refrigerator, and when the refrigerator is connected to an external AC power source, it stores the electric energy provided by the AC power source, and can convert the voltage of the AC power source into an operating voltage that meets the type judgment module 702 and the voltage conversion module 703. When the refrigerator is not connected to an external AC power source, it can be used as a backup power source for the refrigerator, and can be used as a DC power source to supply energy to the refrigerator in the case of a temporary power outage.
[0050] The embodiments of the refrigerator provided in the present application have been explained in the specific embodiments of the power supply circuit of the corresponding refrigerator, and will not be repeated here.
[0051] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.
[0052] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A power supply circuit for a refrigerator, characterized in that: include: A type determination module, used to connect to a power supply and determine the power type of the power supply, wherein the power type includes an AC power supply and a DC power supply; A voltage conversion module includes multiple voltage conversion units, which are connected to the type judgment module and are used to determine a target voltage conversion unit according to the power type of the power supply, and convert the voltage of the power supply through the target voltage conversion unit to output the working voltage of the refrigerator.
2. The power supply circuit of the refrigerator according to claim 1, characterized in that: The power source type includes a low-voltage AC power source; the voltage conversion module includes: a first voltage conversion unit, which is used to increase the voltage of the power supply to the working voltage of the refrigerator when the power supply is a low-voltage AC power source.
3. The power supply circuit of the refrigerator according to claim 1, characterized in that: The voltage conversion module includes: a second voltage conversion unit, which is used to adjust the DC voltage of the power supply to the AC working voltage of the refrigerator when the power supply is a DC power supply.
4. The power supply circuit of the refrigerator according to claim 1, characterized in that: The type judgment module includes: a first type judgment unit and a second type judgment unit; The first type determination unit is used to connect to the power supply, and output a first determination signal according to the power type of the power supply, wherein the first determination signal is used to indicate whether the power supply is an AC power supply or a DC power supply; The second type judgment unit is connected to the first type judgment unit, and is used to output a second judgment signal according to the voltage of the power supply when the first judgment signal indicates that the power supply is an AC power supply; the second judgment signal is used to indicate whether the power supply is a high voltage AC power supply or a low voltage AC power supply.
5. The power supply circuit of the refrigerator according to claim 4, characterized in that: The first type determination unit includes: a first diode, a first capacitor and a first switch tube; The anode of the first diode is used to be connected to the power supply, and the cathode of the first diode is connected to the first end of the first capacitor; the second end of the first capacitor is connected to the control end of the first switch tube; the first end of the first switch tube is connected to the working power supply, and the first end of the first switch tube is used to output the first judgment signal; the second end of the first switch tube is grounded.
6. The power supply circuit of the refrigerator according to claim 5, characterized in that: The first switch tube includes: a light emitting diode and an optical switch tube; the anode of the light emitting diode is connected to the second end of the first capacitor; the first end of the optical switch tube is connected to the working voltage, and the second end of the optical switch tube is grounded, and the optical switch tube is used to turn on or off according to the light emitting state of the light emitting diode.
7. The power supply circuit of the refrigerator according to claim 5, characterized in that: The first type determination unit further includes: a first switch, which is arranged between the power supply and the first diode, and is used to be closed when the refrigerator is connected to the power supply, and opened when the refrigerator is not connected to the power supply.
8. The power supply circuit of the refrigerator according to claim 4, characterized in that: The second type judgment unit includes: a transformer, a second diode, a second capacitor and a second switch tube; The side where the primary winding of the transformer is located is connected to the first type judgment unit; the side where the secondary winding of the transformer is located is connected to the anode of the second diode; the cathode of the second diode is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the control end of the second switch tube; the first end of the second switch tube is connected to the working voltage, and the first end of the second switch tube is used to output the second judgment signal; the second end of the second switch tube is grounded.
9. The power supply circuit of the refrigerator according to claim 8, characterized in that: The second type determination unit further includes: a second switch, which is arranged between the first type determination unit and the transformer and is used for closing or opening according to the first determination signal.
10. A refrigerator, characterized in that: include: A power supply circuit for a refrigerator as claimed in any one of claims 1 to 9.