Refrigerator

Abstract

The utility model discloses a refrigerator which comprises a power supply end, a rectifier module, a voltage division module and a power supply control module, the power supply control module comprises a first relay and a second relay, and the first relay and the second relay switch working states according to divided voltage; wherein when the divided voltage is smaller than the working voltage of the relays, the first relay and the second relay work in a first state; and when the divided voltage is greater than or equal to the working voltage of the relays, the first relay and the second relay work in a second state. Voltage on a power supply circuit is monitored and power supply of a relay coil is controlled in a resistor voltage division mode, switching of power supply paths is completed through relay contacts, the power supply circuit is compatible with different power supply voltages, switching of power supply is not needed when the power supply voltage is too high, the power supply safety of the refrigerator is effectively improved, and the power supply cost is reduced. And normal use of the refrigerator is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, and particularly relates to a refrigerator. Background Art

[0002] There are differences in grid voltages in different countries and regions. In some regions, it is AC220V, while in some regions, it is AC110V. Refrigerators need to be able to work properly under different voltage conditions. Therefore, it is necessary to select the correct supply voltage according to the actual use conditions to avoid damaging components due to using the wrong voltage. When existing refrigerators are designed at the factory, different main control boards are designed for different regional use voltages. For example, when the voltage in the refrigerator use area is AC220V, the main control board is selected to be powered by AC220V. Similarly, when the use area voltage is AC110V, the main control board is selected to be powered by AC110V. Although different main control boards are designed to correspond to different regional power supply methods, in actual applications, there may be problems such as incorrect installation of the main control board, or the problem that the refrigerator location area does not match the refrigerator voltage, resulting in a refrigerator powered by AC110V being wrongly connected to 220V power supply. At this time, the too high voltage will burn out the main board, and existing refrigerators cannot be compatible with these two supply voltages, posing a great potential safety hazard. Summary of the Utility Model

[0003] The purpose of the embodiments of the utility model is to provide a refrigerator, which can effectively improve the power supply safety of the refrigerator.

[0004] To achieve the above purpose, the embodiments of the utility model provide a refrigerator, including:

[0005] A box body, in which at least one storage compartment is formed;

[0006] A refrigeration system, including a compressor, a condenser and an evaporator connected in sequence through pipelines, and the refrigeration system is used to provide cooling capacity for the refrigerator;

[0007] A power supply terminal, connected to an external power supply device, for inputting an AC supply voltage to supply power to the refrigerator;

[0008] A rectification module, connected to the power supply terminal, for converting the AC supply voltage into a DC supply voltage;

[0009] A voltage division module, connected to the rectification module, for dividing the DC supply voltage, and a specified output terminal of the voltage division module outputs a divided voltage;

[0010] The power supply control module includes a first relay and a second relay. The first relay and the second relay are respectively connected to the first designated output terminal of the voltage dividing module. The first designated output terminal outputs a divided voltage, and the first relay and the second relay switch their working states according to the divided voltage. Among them, when the divided voltage is less than the working voltage of the relay, the first relay and the second relay work in the first state; when the divided voltage is greater than or equal to the working voltage of the relay, the first relay and the second relay work in the second state.

[0011] The beneficial effect of this embodiment is that the switching of the power supply path is completed through the relay contacts, so that the power supply line is compatible with different power supply voltages. When the power supply voltage is too high, there is no need to switch the power supply, effectively improving the power supply safety of the refrigerator and ensuring the normal use of the refrigerator.

[0012] As an improvement to the above solution, the refrigerator further includes a first capacitor, a second capacitor and a third capacitor disposed between the rectification module and the voltage dividing module. Among them,

[0013] The first end of the first capacitor is connected to the first set of contacts of the first relay. The first set of contacts of the first relay are also respectively connected to the first output terminal of the rectification module and the first end of the voltage dividing module.

[0014] The first end of the second capacitor is connected to the second end of the first capacitor. The second end of the second capacitor, the second end of the voltage dividing module and the second output terminal of the rectification module are grounded.

[0015] The first end of the third capacitor is connected to the first set of contacts of the first relay. The second end of the third capacitor is connected to the second set of contacts of the second relay. The second set of contacts of the second relay are also respectively connected to the power supply terminal and the first set of contacts of the second relay. The first set of contacts of the second relay are grounded.

[0016] The second set of contacts of the first relay are disposed between the two input terminals of the power supply terminal.

[0017] The beneficial effect of this embodiment is that the setting methods of the first capacitor, the second capacitor and the third capacitor enable the support of the DC power supply voltage and maintain the stability of the power supply voltage. In addition, the switching of the power supply path is completed through the relay contacts, so that the power supply line is compatible with different power supply voltages.

[0018] As an improvement to the above solution, each set of contacts of the first relay and the second relay includes a common point, a normally closed contact and a normally open contact. Among them,

[0019] When the first relay and the second relay work in the first state, the first relay and the second relay do not operate, and both the first relay and the second relay remain in the state where the normally closed contacts are closed.

[0020] When the first relay and the second relay work in the second state, the first relay and the second relay operate, and both the first relay and the second relay remain in the state where the normally open contacts are closed.

[0021] The beneficial effect of this embodiment is that by using the working principle of the normally open / normally closed relays to control the switching of the supply voltage, the supply safety of the refrigerator can be effectively improved.

[0022] As an improvement to the above solution, the voltage dividing module includes at least two resistors, and the first designated output terminal and the second designated output terminal of the voltage dividing module are respectively disposed at both ends of one of the resistors.

[0023] The beneficial effect of this embodiment is that by reasonably setting the resistors in the voltage dividing module, the voltage dividing function can be achieved.

[0024] As an improvement to the above solution, the power supply control module further includes a triode, a second diode, and a fifth resistor. The base of the triode is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to the second end of the fifth resistor, the first end of the fifth resistor is connected to the second designated output terminal of the voltage dividing module, the collector of the triode is connected to the first relay, and the emitter of the triode is grounded.

[0025] The beneficial effect of this embodiment is that by controlling whether to supply power to the relay coil through the triode, when the supply voltage is too high, the power supply can be switched in time, effectively improving the supply safety of the refrigerator.

[0026] As an improvement to the above solution, the power supply control module further includes a first diode. The positive electrode of the first diode is connected to the emitter of the triode, and the negative electrode of the first diode is respectively connected to the first end of the first relay and the first end of the second relay.

[0027] The beneficial effect of this embodiment is that the first diode provides a stable voltage for the first relay and the second relay.

[0028] As an improvement to the above solution, the power supply control module further includes a third diode. The positive electrode of the third diode is respectively connected to the collector of the triode, the second end of the first relay, and the second end of the second relay, and the negative electrode of the third diode is respectively connected to the first end of the first relay, the first end of the second relay, and the first designated output terminal of the voltage dividing module.

[0029] The beneficial effects of this embodiment are as follows: By setting a third diode in the collector circuit of the triode, the triode can be protected from being damaged by the high-voltage back electromotive force when the relay coil loses power.

[0030] As an improvement to the above solution, the refrigerator further includes a first indicator light and a second indicator light. The first indicator light is arranged between the second end of the first relay and the collector of the triode, and the second indicator light is arranged between the second set of contacts of the second relay and the power supply terminal.

[0031] The beneficial effects of this embodiment are as follows: The first indicator light and the second indicator light are used to indicate the supply voltage of the refrigerator at this time.

[0032] As an improvement to the above solution, the power supply control module further includes a third relay. The first set of contacts of the third relay are respectively connected to the second end of the first power resistor and the first end of the second power resistor. Among them, the first end of the first power resistor is connected to the first input terminal of the power supply terminal, and the second end of the second power resistor is connected to the second input terminal of the power supply terminal; the second power resistor is also connected to the heating wire in the refrigerator.

[0033] The beneficial effects of this embodiment are as follows: The supply voltage is stepped down by the power resistor to prevent the heating wire of the refrigerator from being burned out due to too high supply voltage. Description of the Drawings

[0034] Figure 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of the structure of the refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the connection of the controller and its control components provided by an embodiment of the present invention;

[0038] Figure 5 is a block diagram of the structure of the power supply system provided by an embodiment of the present invention;

[0039] Figure 6 is the first circuit diagram of the power supply system provided by an embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of the contacts of the relay provided by an embodiment of the present invention;

[0041] Figure 8It is the working principle diagram of the power supply system provided by the embodiment of the present utility model;

[0042] Figure 9 It is the second circuit diagram of the power supply system provided by the embodiment of the present utility model;

[0043] Figure 10 It is the third circuit diagram of the power supply system provided by the embodiment of the present utility model;

[0044] Figure 11 It is the fourth circuit diagram of the power supply system provided by the embodiment of the present utility model.

[0045] Among them, 100 is a refrigerator; 111 is a refrigerating chamber; 112 is a freezing chamber; 101 is a compressor; 102 is an evaporator; 103 is a capillary tube; 104 is a condenser; 201 is a controller; 202 is a touch screen; 203 is a memory; 204 is a damper; 205 is a blower; 206 is a refrigerating temperature sensor; 207 is a freezing temperature sensor; 208 is an ambient temperature sensor; 209 is an evaporation temperature sensor; 10 is a power supply terminal; 20 is a rectification module; 30 is a voltage division module; 40 is a power supply control module. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0048] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0049] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] See Figure 1 , Figure 1 which is a schematic diagram of the external structure of a refrigerator 100 provided by an embodiment of the present invention. The refrigerator 100 of this embodiment has an approximately cuboid shape. The refrigerator includes a box body defining a storage space and one or more door bodies provided at the opening of the box body. Among them, the door body includes a door body outer shell located outside the box body, a door body inner liner located inside the box body, an upper end cover, a lower end cover, and a heat insulation layer located between the door body outer shell, the door body inner liner, the upper end cover, and the lower end cover; generally, the heat insulation layer is filled with foaming material. The box body is provided with a chamber, and the chamber includes a component storage chamber for placing components in the refrigerator, such as a compressor compartment, etc., and also includes a storage space for storing foods, etc.

[0051] See Figure 2 , Figure 2 which is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into multiple storage compartments. According to different uses, the storage compartments can be configured as a refrigerating compartment 111 and a freezing compartment 112, and can also include a variable temperature compartment, a vacuum drawer, a humidity preservation drawer, etc. Each storage compartment corresponds to one or more door bodies. For example, in Figure 2 , the upper storage compartment is provided with a double-door body. Among them, the door body can be pivotally provided at the opening of the box body, or can also be opened in a drawer type to achieve drawer-type storage.

[0052] See Figure 3 , Figure 3Schematic diagram of the structure of the refrigeration system in the refrigerator 100 provided by the embodiment of the present utility model. The refrigeration system includes a compressor 101, an evaporator 102, a drying filter (not shown in the figure), a capillary tube 103, a condenser 104, and a gas-liquid separator (not shown in the figure). The working process of the refrigeration system includes a compression process, a condensation process, a throttling process, and an evaporation process. Among them, the compression process is as follows: Plug in the power cord of the refrigerator. When the contacts of the thermostat are closed, the compressor 101 starts to work. The low-temperature and low-pressure refrigerant is sucked into the compressor 101 and compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 101, and then discharged into the condenser 104; the condensation process is as follows: The high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 104, and the temperature continuously drops, gradually being cooled into a normal-temperature and high-pressure saturated vapor, and further cooled into a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant is almost unchanged during the entire condensation process; the throttling process is as follows: The condensed refrigerant saturated liquid flows into the capillary tube 103 after being filtered by the drying filter to remove moisture and impurities, and throttles and reduces the pressure through it, and the refrigerant becomes a normal-temperature and low-pressure wet vapor; the evaporation process is as follows: The normal-temperature and low-pressure wet vapor starts to absorb heat and vaporize in the evaporator 102, not only reducing the temperature of the evaporator 102 and its surroundings, but also turning the refrigerant into a low-temperature and low-pressure gas. The refrigerant coming out of the evaporator 102 returns to the compressor 101 again after passing through the gas-liquid separator. Repeating the above process, the heat in the refrigerator is transferred to the air outside the box, achieving the purpose of refrigeration.

[0053] See Figure 4 , Figure 4 is a schematic diagram of the connection of the controller and its control components provided by the embodiment of the present utility model. The refrigerator 100 includes:

[0054] A controller 201, disposed inside the box body, for receiving the detection data of the refrigerating temperature sensor 206, the freezing temperature sensor 207, the ambient humidity sensor 208, and the evaporation temperature sensor 209, and controlling the opening and closing / closure of the air damper 204 (including the refrigerating air damper and the freezing air damper), the blower 205, and the compressor 101;

[0055] A touch screen 202, disposed on one of the box doors, and the touch screen 202 is used for displaying prompt information and receiving the touch operation of the user;

[0056] A memory 203, for storing the operating parameters of the refrigerator, such as the operating parameters include: the refrigerating temperature detected by the refrigerating temperature sensor 206, the freezing temperature detected by the freezing temperature sensor 207, the ambient temperature detected by the ambient temperature sensor 208, etc., and storing the rotation speed of the blower 205, the rotation speed of the compressor 101, the defrosting time, etc.;

[0057] The air dampers 204 include a refrigerating air damper and a freezing air damper. The refrigerating air damper is arranged in the air duct communicating with the refrigerating chamber 111. When the refrigerating air damper is opened, the cold air in the air duct can smoothly enter the refrigerating chamber 111. When the refrigerating air damper is closed, the cold air in the air duct cannot enter the refrigerating chamber 111. The freezing air damper is arranged in the air duct communicating with the freezing chamber 112. When the freezing air damper is opened, the cold air in the air duct can smoothly enter the freezing chamber 112. When the freezing air damper is closed, the cold air in the air duct cannot enter the freezing chamber 112;

[0058] The blower 205 is arranged in the air duct of the refrigerator and is used to make air enter the evaporator 102 for heat exchange and send the air after heat release to the storage chamber of the refrigerator;

[0059] The refrigerating temperature sensor 206 is arranged in the refrigerating chamber 111 and is used to detect the refrigerating temperature of the refrigerating chamber 111;

[0060] The freezing temperature sensor 207 is arranged in the freezing chamber 112 and is used to detect the freezing temperature of the freezing chamber 112;

[0061] The ambient temperature sensor 208 is arranged outside the refrigerator body and is used to detect the ambient temperature of the environment where the refrigerator is located. After sending this ambient temperature to the controller 201, the controller 201 can adjust its operating parameters according to the ambient temperature;

[0062] The evaporation temperature sensor 209 is arranged in the evaporator 102 and is used to detect the evaporation temperature of the evaporator 102;

[0063] Further, the refrigerator may further include a defrost heater (or not). The defrost heater is arranged on one side of the evaporator. After the compressor works for a period of time (about 8 - 10 hours), the surface of the fin evaporator will also frost. If defrosting is not carried out, the frost will become thicker and thicker until the fin evaporator is completely covered and the air duct is blocked, resulting in the inability of cold air to circulate and the decline of refrigeration effect. The defrost timer works for 8 - 10 hours, automatically cuts off the power supply of the compressor, turns on the electric heating tube in the defrost heater, and the heating tube heats to melt the frost on the fin evaporator. After the defrosting is completed, the defrost timer cuts off the power supply of the electric heating tube and turns on the power supply of the compressor to resume refrigeration, and this cycle repeats continuously.

[0064] To improve the power supply safety, the refrigerator 100 in the embodiment of the present invention provides a power supply system. Refer to Figure 5 , Figure 5 is the structural block diagram of the power supply system provided by the embodiment of the present invention. The power supply system includes:

[0065] The power supply terminal 10 is connected to an external power supply device and is used to input an AC power supply voltage to supply power to the refrigerator;

[0066] A rectification module 20 is connected to the power supply terminal 10 to convert the AC supply voltage into a DC supply voltage.

[0067] A voltage division module 30 is connected to the rectification module 20 to divide the DC supply voltage. The designated output terminal of the voltage division module outputs a divided voltage.

[0068] A power supply control module 40 includes a first relay and a second relay. The first relay and the second relay are respectively connected to the first designated output terminal of the voltage division module. The first designated output terminal outputs a divided voltage, and the first relay and the second relay switch their working states according to the divided voltage. Wherein, when the divided voltage is less than the operating voltage of the relay, the first relay and the second relay operate in the first state; when the divided voltage is greater than or equal to the operating voltage of the relay, the first relay and the second relay operate in the second state.

[0069] Exemplarily, refer to Figure 6 , Figure 6 which is the first circuit diagram of the power supply system provided by the embodiment of the present invention. In combination with Figure 6 a detailed description is given to the power supply terminal 10, the rectification module 20, the voltage division module 40 and the power supply control module 40.

[0070] For the power supply terminal 10, L and N represent two wires in the AC circuit and are used to connect to an AC mains such as 110V or 220V.

[0071] The rectification module 20 is a rectifier bridge composed of 4 diodes, which converts the AC supply voltage into a DC supply voltage. The first input terminal and the second input terminal of the rectification module 20 are respectively connected to the two input terminals of the power supply terminal 10.

[0072] The voltage division module 30 includes at least two resistors. The first designated output terminal and the second designated output terminal of the voltage division module are respectively arranged at both ends of one of the resistors. In the embodiment of the present invention, the voltage division module 30 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The first designated output terminal and the second designated output terminal are respectively arranged at both ends of the third resistor R3. A first voltage input terminal V1 is provided in the voltage division module 30, and the four resistors in the voltage division module 30 are used to divide the voltage of V1.

[0073] The power supply control module 40 includes a first relay K1 and a second relay K2. The first relay K1 and the second relay K are respectively connected to the first designated output terminal of the voltage division module 30.

[0074] Further, the refrigerator further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3 disposed between the rectification module 20 and the voltage division module 30; wherein, a first end of the first capacitor C1 is connected to a first set of contacts K1A of the first relay K1, and the first set of contacts K1A of the first relay K1 is also respectively connected to a first output end of the rectification module 20 and a first end of the voltage division module 30; a first end of the second capacitor C2 is connected to a second end of the first capacitor C1, and a second end of the second capacitor C2, a second end of the voltage division module 30, and a second output end of the rectification module 20 are grounded; a first end of the third capacitor C3 is connected to the first set of contacts K1A of the first relay K1, and a second end of the third capacitor C3 is connected to a second set of contacts K2B of the second relay K2; the second set of contacts K2B of the second relay K2 is also respectively connected to the power supply terminal 10 and a first set of contacts K2A of the second relay K2, and the first set of contacts K2A of the second relay K2 is grounded; a second set of contacts K1B of the first relay K1 is disposed between two input ends of the power supply terminal.

[0075] Specifically, each set of contacts of the first relay K1 and the second relay K2 includes a common point, a normally closed contact, and a normally open contact. Exemplarily, see Figure 7 , Figure 7 is a schematic diagram of the contacts of the relay provided by an embodiment of the present invention. Taking the first relay K1 as an example for illustration, 3A and 4A are normally closed contacts, 3B and 4B are normally open contacts, 3 and 4 are common points, and 13 and 14 are external ports for connecting the relay to the circuit. The relay also includes a resistor Rk1 and a diode Dk1. As Figure 6 shown, the first relay K1 uses the external port 13 as a first end, and this first end is used to connect to the sixth resistor R6, and then connect to the first designated output end of the voltage division module 30 through the sixth resistor R6. Further, the first relay K1 uses the external port 14 as a second end, and this second end is connected to the collector of the triode N1.

[0076] Specifically, when the first relay K1 and the second relay K2 operate in the first state, the first relay K1 and the second relay K2 do not act, and the first relay K1 and the second relay K2 both remain in the normally closed contact connection state; when the first relay K1 and the second relay K2 operate in the second state, the first relay K1 and the second relay K2 act, and the first relay K1 and the second relay K2 both remain in the normally open contact connection state.

[0077] Exemplarily, when the first relay K1 and the second relay K2 are operating in the first state, in the first set of contacts K1A of the first relay K1, the common point 4 is connected to the normally closed contact 4A; in the second set of contacts K1B of the first relay K1, the common point 3 is connected to the normally closed contact 3A; in the first set of contacts K2A of the second relay K2, the common point 4 is connected to the normally closed contact 4A; in the second set of contacts K2B of the second relay K2, the common point 3 is connected to the normally closed contact 3A.

[0078] Exemplarily, when the first relay K1 and the second relay K2 are operating in the second state, in the first set of contacts K1A of the first relay K1, the common point 4 is connected to the normally open contact 4B; in the second set of contacts K1B of the first relay K1, the common point 3 is connected to the normally open contact 3B; in the first set of contacts K2A of the second relay K2, the common point 4 is connected to the normally open contact 4B; in the second set of contacts K2B of the second relay K2, the common point 3 is connected to the normally open contact 3B.

[0079] Further, the normally open contact in the second set of contacts K1B of the first relay K1 is connected to the first end of the first varistor RV1, and the first end of the normally closed contact is connected to the second varistor RV2. The second ends of the first varistor RV1 and the second varistor RV2 are respectively connected to the "N" power supply terminal of the power supply terminal 10. The first varistor RV1 and the second varistor RV2 are used for surge protection. For different input voltage levels, different model specifications are used and can be set as required. The power supply control module 40 further includes a triode N1, a second diode D2, and a fifth resistor R5. The base of the triode N1 is connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected to the second end of the fifth resistor R5, the first end of the fifth resistor R5 is connected to the second designated output terminal of the voltage dividing module 30, the collector of the triode N1 is respectively connected to the second ends of the first relay K1 and the second relay K2, and the emitter of the triode N1 is grounded. The power supply control module 40 further includes a first diode D1. The positive electrode of the first diode D1 is connected to the emitter of the triode N1, and the negative electrode of the first diode D1 is respectively connected to the first ends of the first relay K1 and the second relay K2.

[0080] Exemplarily, see Figure 8 , Figure 8It is the working principle diagram of the power supply system provided by the embodiment of the present utility model. Assume that the first varistor RV1 is applied in the AC220V circuit, and 14K621 (pin pitch 14mm, breakdown voltage 620V) is usually used; the second varistor RV2 is applied in the AC110V circuit, and 14K271 (pin pitch 14mm, breakdown voltage 270V) is usually used. For the second varistor RV2, when an incorrect input of AC220V occurs under the AC110V applied voltage, it will cause RV2 to break down and be damaged. Assume that R1 is 100K, R2 is 100K, R3 is 4.9K, R4 is 3K, the working voltages of the first relay K1 and the second relay K2 are both 12V, and the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all support capacitors. Among them, the third capacitor C3 is 450V / 270uF and is used in the AC220V circuit, and the first capacitor C1 and the second capacitor C2 are 250V / 470uF and are used in the AC110V circuit. At this time, there are two situations:

[0081] 1. When LN is connected to AC110V, the first voltage input terminal V1 of the voltage dividing module 30 inputs 310V. At this time, the voltage at the upper end of R4 is 4.4V. Since the first diode D1 is a zener diode (6.8V) and is less than the breakdown voltage, it does not work. At this time, the base voltage of the triode N1 is 0V due to the pull-down resistor R11, and the triode N1 does not work. The collector voltage of the triode N1 is the input voltage of the second voltage input terminal V2 of the voltage control module 40. At this time, the voltage at point A (the first specified output terminal) is 11.7V. Since the working voltages of the first relay K1 and the second relay K2 are 12V, therefore, the voltages across the coils of the first relay K1 and the second relay K2 are 0V, which does not meet the working voltage, and the first relay K1 and the second relay K2 do not act and work in the first state. The corresponding contacts K1A, K1B, K2A, and K2B all conduct the normally closed contacts. At this time, the second varistor RV2 conducts, and the first capacitor C1 and the second capacitor C2 are connected to realize 110V power supply.

[0082] 2. When the LN is connected to AC220V, the first voltage input terminal V1 of the voltage dividing module 30 inputs 310V. Since the breakdown voltage of the varistor RV1 is 270V, at this time, the second varistor RV2 breaks down and works. The short-time voltage is 310V, with large energy, and it breaks down and burns out. At this time, V1 is 620V. Since R1 is set to 100K, R2 is set to 100K, R3 is set to 4.9K, and R4 is set to 3K, the voltage at the upper end of R4 is 8.8V. Since the first diode D1 is a voltage stabilizing diode (6.8V), which is greater than the breakdown voltage, the first diode D1 works. At this time, the base voltage of the triode N1 is greater than the emitter junction voltage, the emitter junction conducts, the triode N1 works, and the collector voltage of the triode N1 is 0V. At this time, the voltage at point A (the first designated output terminal) is 23.4V. The operating voltages of the first relay K1 and the second relay K2 are 12V. Since point A is broken down and conducted through the sixth resistor R6 and D1 (voltage stabilizing diode 12V), V2 is 12V. Therefore, the voltages across the coils of the first relay K1 and the second relay K2 are 12V, meeting the operating voltage. The first relay K1 and the second relay K2 act and work in the second state. The corresponding contacts K1AK1A, K1B, K2A, and K2B all conduct the normally open contacts. At this time, the first varistor RV1 conducts, and the third capacitor C3 conducts, and the power supply is switched to 220V power supply.

[0083] Specifically, refer to Figure 9 , Figure 9 Figure 2 is the second circuit diagram of the power supply system provided by the embodiment of the present invention. A seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10 are further provided between the rectification module 20 and the voltage dividing module 30. The second end of the eighth resistor R8 is connected to the second end of the first capacitor C1. The seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 are balancing resistors, which are used to ensure the voltage consistency at both ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3. The first capacitor C1, the second capacitor C2, and the third capacitor C3 are support electrolytic capacitors, which can support the DC power supply voltage and maintain the stability of the power supply voltage.

[0084] Specifically, refer to Figure 10 , Figure 10It is the third circuit diagram of the power supply system provided by the embodiment of the present utility model. The power supply control module 40 further includes a third diode D3. The positive electrode of the third diode D3 is respectively connected to the collector of the triode N1, the second end of the first relay K1, and the second end of the second relay K2. The negative electrode of the third diode D3 is respectively connected to the first end of the first relay K1, the first end of the second relay K1, and the first designated output end of the voltage dividing module 30. The third diode D3 is a freewheeling diode, which can protect the triode N1 from being damaged by the high-voltage back electromotive force when the coils of the first relay K1 and / or the second relay K2 lose power.

[0085] Specifically, the refrigerator further includes a first indicator lamp LED1 and a second indicator lamp LED2. The first indicator lamp LED1 is arranged between the second end of the first relay K1 and the collector of the triode N1. The second indicator lamp LED2 is arranged between the second set of contacts K2B of the second relay K2 and the power supply terminal 10.

[0086] Exemplarily, both the first indicator lamp LED1 and the second indicator lamp LED2 are light-emitting diodes. When the first relay K1 and the second relay K2 work in the first state, the first indicator lamp LED1 is turned on, indicating that the refrigerator is powered by 110V. When the first relay K1 and the second relay K2 work in the second state, the second indicator lamp LED2 is turned on, indicating that the refrigerator is powered by 220V. The current access voltage can be identified by the indicator lamp, and the tester can confirm whether the current operating voltage is correct according to the actual working conditions.

[0087] Furthermore, when switching to 220V power supply, if the heating wire of the refrigerator is rated for 110V power supply, the 220V power supply input may cause the heating wire to burn out at this time. Therefore, it is necessary to step down the 220V power supply. At this time, the power supply control module 40 further includes a third relay. Refer to Figure 11 , the first set of contacts K3A of the third relay K3 are respectively connected to the second end of the first power resistor RP1 and the first end of the second power resistor RP2. Among them, the first end of the first power resistor RP1 is connected to the first input terminal (″L″ terminal) of the power supply terminal 10, and the second end of the second power resistor RP2 is connected to the second input terminal (″N″ terminal) of the power supply terminal 10. The second power resistor RP2 is also connected in series with the heating wire of the refrigerator.

[0088] Exemplarily, for the third relay K3, the common point 4 of K3A is connected to the normally closed contact 4A. It is designed to work by default at a voltage of AC110V. When the voltage of LN is AC110V, the third relay K3 does not work, and the heating wire can still work normally. When the voltage of LN is AC220V, the relay K3 works, and the common point 4 of K3B is connected to the normally open contact 4B. Since the second power resistor RP2 is connected in series with the heating wire, part of the voltage drops on the second power resistor RP2. Therefore, the heating wire can still work normally and will not be burned out due to high voltage.

[0089] In the embodiment of the present utility model, the switching of the power supply path is completed through the relay contacts, so that the power supply line is compatible with different supply voltages. When the supply voltage is too high, there is no need to switch the power supply, effectively improving the power supply safety of the refrigerator and ensuring the normal use of the refrigerator.

[0090] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A refrigerator, characterized in that, Comprising: A cabinet in which at least one storage chamber is formed; A refrigeration system including a compressor, a condenser, and an evaporator connected in sequence through pipes, and the refrigeration system is used to provide cooling capacity for the refrigerator; A power supply terminal connected to an external power supply device for inputting an AC power supply voltage to supply power to the refrigerator; A rectification module connected to the power supply terminal to convert the AC power supply voltage into a DC power supply voltage; A voltage division module connected to the rectification module to divide the DC power supply voltage, and a designated output terminal of the voltage division module outputs a divided voltage; A power supply control module including a first relay and a second relay, the first relay and the second relay are respectively connected to a first designated output terminal of the voltage division module, the first designated output terminal outputs a divided voltage, and the first relay and the second relay switch their working states according to the divided voltage; wherein, when the divided voltage is less than the operating voltage of the relay, the first relay and the second relay operate in a first state; when the divided voltage is greater than or equal to the operating voltage of the relay, the first relay and the second relay operate in a second state.

2. The refrigerator according to claim 1, characterized in that, The refrigerator further includes a first capacitor, a second capacitor, and a third capacitor disposed between the rectification module and the voltage division module; wherein, A first end of the first capacitor is connected to a first set of contacts of the first relay, and the first set of contacts of the first relay are also respectively connected to a first output terminal of the rectification module and a first end of the voltage division module; A first end of the second capacitor is connected to a second end of the first capacitor, and a second end of the second capacitor, a second end of the voltage division module, and a second output terminal of the rectification module are grounded; A first end of the third capacitor is connected to a first set of contacts of the first relay, and a second end of the third capacitor is connected to a second set of contacts of the second relay; the second set of contacts of the second relay are also respectively connected to the power supply terminal and a first set of contacts of the second relay, and the first set of contacts of the second relay are grounded; A second set of contacts of the first relay are disposed between two input terminals of the power supply terminal.

3. The refrigerator according to claim 1, characterized in that, Each set of contacts of the first relay and the second relay includes a common point, a normally closed contact, and a normally open contact; wherein, When the first relay and the second relay operate in the first state, the first relay and the second relay do not act, and the first relay and the second relay both remain in a state where the normally closed contacts are connected; When the first relay and the second relay operate in the second state, the first relay and the second relay act, and the first relay and the second relay both remain in a state where the normally open contacts are connected.

4. The refrigerator according to claim 1, wherein, The voltage division module includes at least two resistors, and a first designated output terminal and a second designated output terminal of the voltage division module are respectively disposed at two ends of one of the resistors.

5. The refrigerator according to claim 1, wherein, The power supply control module further includes a first diode, a positive electrode of the first diode is connected to an emitter of a triode, and a negative electrode of the first diode is respectively connected to a first end of the first relay and a first end of the second relay.

6. The refrigerator according to claim 1, wherein, The power supply control module further includes a triode, a second diode, and a fifth resistor. The base of the triode is connected to the positive electrode of the second diode. The negative electrode of the second diode is connected to the second end of the fifth resistor. The first end of the fifth resistor is connected to the second designated output terminal of the voltage division module. The collector of the triode is connected to the first relay, and the emitter of the triode is grounded.

7. The refrigerator according to claim 6, characterized in that, The power supply control module further includes a third diode. The positive electrode of the third diode is respectively connected to the collector of the triode, the second end of the first relay, and the second end of the second relay. The negative electrode of the third diode is respectively connected to the first end of the first relay, the first end of the second relay, and the first designated output terminal of the voltage division module.

8. The refrigerator according to claim 6, characterized in that, The refrigerator further includes a first indicator light and a second indicator light. The first indicator light is disposed between the second end of the first relay and the collector of the triode. The second indicator light is disposed between the second set of contacts of the second relay and the power supply terminal.

9. The refrigerator according to claim 1, characterized in that, The power supply control module further includes a third relay. The first set of contacts of the third relay are respectively connected to the second end of the first power resistor and the first end of the second power resistor. Among them, the first end of the first power resistor is connected to the first input terminal of the power supply terminal, and the second end of the second power resistor is connected to the second input terminal of the power supply terminal. The second power resistor is further connected to a heating wire in the refrigerator.

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