Refrigerator, control method of defrosting heater of refrigerator and storage medium

Abstract

The embodiment of the invention belongs to the technical field of household appliances, and provides a refrigerator, a control method of a defrosting heater of the refrigerator and a storage medium, the refrigerator comprises a box body used for defining a storage space of the refrigerator, a refrigerating system arranged in the box body, the defrosting heater arranged in the refrigerating system and a driving assembly connected with the defrosting heater, the refrigerating system comprises a compressor and an evaporator, and the defrosting heater is arranged on one side of the evaporator so as to remove a frost layer on the evaporator. The driving assembly is used for rectifying power supply alternating voltage of the defrosting heater to form direct voltage, determining PWM duty ratio according to rated voltage of the defrosting heater and the direct voltage when a defrosting instruction is received, then determining working power of the defrosting heater as first power according to the PWM duty ratio, controlling the defrosting heater to operate at the first power, and controlling the defrosting heater to operate at the second power. The working power of the defrosting heater can be automatically adjusted, the direct-current power supply requirement of the defrosting heater is met, and constant-power control is achieved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of household appliances, and more specifically, to a refrigerator, a control method for a defrost heater of the refrigerator, and a storage medium. Background Art

[0002] When the refrigerator is refrigerating, the moisture in the circulating air will frost on the evaporator and connecting pipes. Therefore, the evaporator and connecting pipes need to be defrosted at regular intervals.

[0003] At present, the defrost process of the refrigerator is generally achieved by controlling a relay. Specifically, the defrost heater of the refrigerator is turned on by controlling the opening of the relay, and the defrost heater of the refrigerator is turned off by controlling the closing of the relay.

[0004] However, the above method cannot achieve constant working power of the defrost heater, so that when the voltage is too low, the defrosting is insufficient, and when the voltage is too high, the safety is low. Summary of the invention

[0005] The embodiments of the present application provide a refrigerator, a control method for a defrost heater of the refrigerator, and a storage medium, which can be used to solve the problem that the related art cannot achieve constant working power of the defrost heater, resulting in insufficient defrosting when the voltage is too low, and low safety when the voltage is too high.

[0006] In a first aspect, an embodiment of the present application provides a refrigerator, comprising:

[0007] A box body, used to define the storage space of the refrigerator;

[0008] A refrigeration system arranged in the box includes a compressor, an evaporator, and a defrost heater arranged on one side of the evaporator, wherein the compressor provides power for the refrigeration cycle of the refrigerator, and the defrost heater is used to remove frost on the evaporator;

[0009] The driving assembly connected to the defrost heater is used for:

[0010] Rectifying the AC voltage supplied to the defrost heater to form a DC voltage;

[0011] When receiving a defrost instruction, determining a pulse width modulation (PWM) duty cycle according to the rated voltage of the defrost heater and the DC voltage;

[0012] According to the PWM duty cycle, determining that the working power of the defrost heater is a first power;

[0013] The defrost heater is controlled to operate at the first power.

[0014] In this embodiment, the refrigerator includes a box body for defining a storage space of the refrigerator, a refrigeration system arranged in the box body, a defrost heater arranged in the refrigeration system, and a driving component connected to the defrost heater, wherein the refrigeration system includes a compressor and an evaporator, and the defrost heater is arranged on one side of the evaporator to remove the frost layer on the evaporator. The driving component is used to rectify the AC voltage of the defrost heater to form a DC voltage, and when receiving a defrost instruction, determine the PWM duty cycle according to the rated voltage and DC voltage of the defrost heater, and then determine the working power of the defrost heater as the first power according to the PWM duty cycle, and control the defrost heater to operate at the first power, so as to realize automatic adjustment of the working power of the defrost heater to meet its DC power supply requirements and realize constant power control.

[0015] In some embodiments of the present application, the driving component includes a driving chip, a first controller, a driving circuit, a rectifying circuit and a voltage sampling circuit;

[0016] The driving chip is connected to the first controller and the driving circuit respectively, the input end of the rectifier circuit is connected to a power supply, the output end of the rectifier circuit is connected to the input end of the driving circuit and the voltage sampling circuit respectively, and the output end of the voltage sampling circuit is connected to the first controller;

[0017] The rectifier circuit is used to rectify the AC power supply voltage to form the DC voltage, and provide the DC voltage to the drive circuit and the voltage sampling circuit;

[0018] The voltage sampling circuit is used to sample the DC voltage to obtain a voltage analog signal, and send the voltage analog signal to the first controller;

[0019] The first controller is used for:

[0020] Obtaining the resistance value and rated voltage of the defrost heater;

[0021] When the defrost instruction is obtained, determining the PWM duty cycle according to the resistance value, the rated voltage and the voltage simulation signal;

[0022] According to the PWM duty cycle, determining that the working power of the defrost heater is a first power;

[0023] sending a driving signal corresponding to the PWM duty cycle to the driving circuit, wherein the driving signal is used to control the working power of the defrost heater to be the first power;

[0024] The driving circuit is used to drive the defrost heater to operate according to the driving signal and the DC voltage.

[0025] In this embodiment, the controller of the driving component can determine the PWM duty cycle according to the acquired defrost instruction and the voltage analog signal corresponding to the DC voltage, so as to achieve constant power control of the defrost heater.

[0026] In some embodiments of the present application, the voltage sampling circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;

[0027] The first end of the first resistor is connected to the output end of the rectifier circuit, and the first resistor is connected in series with the second resistor and the third resistor through the second end;

[0028] The first end of the third resistor is connected to the first end of the fourth resistor through a first connecting line, the first end of the first capacitor is connected to the first connecting line; the second end of the first capacitor is connected to the second end of the fourth resistor;

[0029] The second end of the first capacitor serves as an output end of the voltage sampling circuit and is connected to the first controller.

[0030] In this embodiment, voltage sampling can be implemented through a simple voltage sampling circuit to obtain an analog voltage signal corresponding to the DC voltage.

[0031] In some embodiments of the present application, the driving circuit includes: a first diode, a transistor, a current sampling resistor, a fifth resistor, a sixth resistor, a seventh resistor and a second diode;

[0032] The cathode of the first diode is connected to the output end of the rectifier circuit, the first end of the seventh resistor is connected to the first end of the current sampling resistor through a second connecting line, the second end of the current sampling resistor is grounded, and the second end of the seventh resistor is connected to the sixth resistor through a third connecting line;

[0033] The anode of the first diode is connected to the defrost heater and the collector of the transistor respectively, the gate of the transistor is connected to the fifth resistor and the third connecting line, and the emitter of the transistor is connected to the second connecting line;

[0034] The fifth resistor is connected to the first output interface of the driving chip through a fourth connecting line, the sixth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the fourth connecting line;

[0035] The first output interface of the driving chip is connected to the fourth connecting line; the first input interface of the driving chip is connected to the first controller.

[0036] In this embodiment, the defrost heater can be driven to operate according to the driving signal sent by the controller of the driving circuit and the DC voltage provided by the rectifier circuit through the driving circuit.

[0037] In some embodiments of the present application, the rectifier circuit includes: a fuse, a thermistor, a first circuit, an inductor, a rectifier bridge stack and a filter capacitor;

[0038] The first end of the fuse is connected to the power supply, the second end of the fuse is connected to the second end of the thermistor through a fifth connecting line, and the first end of the thermistor is connected to the inductor;

[0039] The inductor is connected to the second end of the rectifier bridge stack, the first end of the rectifier bridge stack is connected to the voltage sampling circuit through the sixth connecting line, and the drive circuit is connected to the sixth connecting line; the first end of the filter capacitor is connected to the sixth connecting line, the second end of the filter capacitor is connected to the fourth end of the rectifier bridge stack, and the third end of the rectifier bridge stack is connected to the inductor.

[0040] In this embodiment, the AC power supply voltage can be rectified into a DC voltage by the rectifier circuit to meet the demand for DC power supply of the defrost heater.

[0041] In some embodiments of the present application, the first circuit includes a first discharge resistor, a second discharge resistor, a third discharge resistor and a second capacitor;

[0042] The first discharge resistor, the second discharge resistor and the third discharge resistor are connected in series and then connected in parallel with the second capacitor.

[0043] In this embodiment, a discharge resistor is provided in the rectifier circuit to maintain the stability and reliability of the circuit.

[0044] In some embodiments of the present application, the rectifier circuit further includes a varistor;

[0045] The varistor is connected to the fifth connecting line and a ground line of the power supply respectively.

[0046] In this embodiment, a surge voltage can be prevented by providing a varistor in the rectifier circuit.

[0047] In some embodiments of the present application, the refrigerator further includes a main controller; the driving assembly includes a first controller; the first controller is connected to the main controller;

[0048] The main controller is used to send the defrost instruction to the first controller when the frost layer on the evaporator meets the defrost condition.

[0049] In this embodiment, the defrost instruction may be generated by the main controller to reduce the workload of the first controller.

[0050] In a second aspect, the present application provides a control method for a defrost heater of a refrigerator, the refrigerator comprising: a box defining a storage space of the refrigerator, a refrigeration system disposed in the box, a defrost heater disposed in the refrigeration system, and a drive assembly connected to the defrost heater;

[0051] Wherein, the refrigeration system comprises: a compressor and an evaporator, and the defrost heater is arranged on one side of the evaporator to remove the frost layer on the evaporator;

[0052] The method comprises:

[0053] Rectifying the AC voltage supplied to the defrost heater to form a DC voltage;

[0054] When receiving a defrost instruction, determining a pulse width modulation (PWM) duty cycle according to the rated voltage of the defrost heater and the DC voltage;

[0055] According to the PWM duty cycle, determining that the working power of the defrost heater is a first power;

[0056] The defrost heater is controlled to operate at the first power.

[0057] In this embodiment, the AC power supply voltage of the defrost heater is rectified to form a DC voltage. When a defrost command is received, the PWM duty cycle is determined according to the rated voltage and the DC voltage of the defrost heater. Then, according to the PWM duty cycle, the working power of the defrost heater is determined to be the first power. The defrost heater is controlled to operate at the first power. The working power of the defrost heater can be automatically adjusted to meet its DC power supply requirements and achieve constant power control.

[0058] In a third aspect, the present application provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0059] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be repeated here.

[0060] In a fourth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the second aspect when executed by a processor.

[0061] The computer program product provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0063] Figure 1 It is a schematic diagram of a relay controlling a defrost heater in the related art;

[0064] Figure 2 A schematic diagram of the structure of a refrigerator provided in an embodiment of the present application;

[0065] Figure 3 A schematic diagram of the structure of a driving component 103 provided in an embodiment of the present application;

[0066] Figure 4 A schematic diagram showing the relationship between the PWM duty cycle and the output voltage of the example of this application;

[0067] Figure 5 A schematic diagram of the structure of a voltage sampling circuit 35 provided in an embodiment of the present application;

[0068] Figure 6 A schematic diagram of the structure of a driving circuit 33 provided in an embodiment of the present application;

[0069] Figure 7 A schematic diagram of the structure of a rectifier circuit 34 provided in an embodiment of the present application;

[0070] Figure 8 This is a schematic diagram of the overall circuit of the driving component 103 provided in the present application;

[0071] Fig. 9 A schematic flow chart of a method for controlling a defrost heater of a refrigerator provided in the present application;

[0072] Fig.10 A schematic flow chart of another method for controlling a defrost heater of a refrigerator provided in the present application. DETAILED DESCRIPTION

[0073] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0074] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0075] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0076] At present, the defrost process of the refrigerator is generally achieved by controlling a relay. Specifically, the defrost heater of the refrigerator is turned on by controlling the opening of the relay, and the defrost heater of the refrigerator is turned off by controlling the closing of the relay.

[0077] Specifically, Figure 1 This is the schematic diagram of the relay controlling the defrost heater in the related technology. The control signal (MCU_De-ht) comes from the 5B pin of the driver UL2003, that is, the microcontroller unit (MCU) sends a control signal to the 5B pin of the driver, which is controlled by the input / output (Input / Output) port of the MCU. The strong power end of the relay is the live wire, so when the MCU_De-ht output is high, the 5C output is low, the defrost heater is connected to the L live wire, and the heater starts working.

[0078] However, the heater is equivalent to a resistor. According to the formula power P=U2 / R, the working power of the defrost heater will vary with the voltage of the L live wire, making it impossible to achieve a constant working power of the defrost heater. This will result in insufficient defrosting when the voltage is too low and low safety when the voltage is too high.

[0079] Therefore, the present application provides a refrigerator, which adds a driving component for driving the defrost heater. Through the driving component, the PWM duty cycle is determined according to the power supply AC voltage and the rated voltage of the defrost heater. The working power of the defrost heater is controlled by the PWM duty cycle. The working power of the defrost heater can be automatically adjusted to meet its DC power supply requirements and achieve constant power control.

[0080] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently. The same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0081] Figure 2 A schematic diagram of the structure of a refrigerator provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the refrigerator includes:

[0082] The box body 101 is used to define the storage space of the refrigerator;

[0083] The refrigeration system 102 disposed in the box 10 includes a compressor 21, an evaporator 22, and a defrost heater 23 disposed on one side of the evaporator. The compressor 21 provides power for the refrigeration cycle of the refrigerator 10, and the defrost heater 23 is used to remove the frost layer on the evaporator 22.

[0084] The driving assembly 103 connected to the defrost heater 23 is used to drive the defrost heater to work.

[0085] Specifically, the driving component 103 is specifically used for:

[0086] The AC power supply voltage of the defrost heater 23 is rectified to form a DC voltage, and when the defrost instruction is obtained, the pulse width modulation (PWM) duty cycle is determined according to the rated voltage and the DC voltage of the defrost heater 23, and then according to the PWM duty cycle, the working power of the defrost heater 23 is determined to be the first power, and the defrost heater 23 is controlled to operate at the first power.

[0087] In a possible implementation, the refrigerator further includes a main controller 104, which is connected to the driving component 103 and is configured to send a defrosting instruction to the driving component 103 when the frost layer on the evaporator 22 meets the defrosting condition.

[0088] Specifically, the driving component 103 may include a first controller 31 ( Figure 1 (not shown), the main controller 104 is connected to the first controller 31, and the main controller 104 can send a defrost instruction to the first controller 31 when the frost layer on the evaporator 22 meets the defrost condition.

[0089] In another possible implementation, the first controller 31 may detect whether the frost layer on the evaporator 22 needs to be defrosted, and generate a defrost instruction if the frost layer on the evaporator 22 meets the defrost condition.

[0090] Exemplarily, the first controller 31 may be an MCU, and the main controller 104 may also be an MCU.

[0091] In this embodiment, the refrigerator includes a box body 101 for defining a storage space of the refrigerator, a refrigeration system 102 arranged in the box body 101, a defrost heater 23 arranged in the refrigeration system 102, and a driving component 103 connected to the defrost heater 23, wherein the refrigeration system 102 includes a compressor 21 and an evaporator 22, and the defrost heater 23 is arranged on one side of the evaporator 22 to remove the frost layer on the evaporator 22. The driving component 103 is used to rectify the AC voltage of the defrost heater 23 to form a DC voltage, and when receiving a defrost instruction, determine the PWM duty cycle according to the rated voltage and the DC voltage of the defrost heater 23, and then determine the working power of the defrost heater 23 as the first power according to the PWM duty cycle, and control the defrost heater 23 to operate at the first power, so as to realize automatic adjustment of the working power of the defrost heater 23, meet its DC power supply requirements, and realize constant power control.

[0092] Next, the structure of the driving assembly 103 will be described in detail.

[0093] Figure 3 A schematic diagram of the structure of a driving component 103 provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the driving component 103 includes a driving chip 32 , a first controller 31 , a driving circuit 33 , a rectifying circuit 34 and a voltage sampling circuit 35 .

[0094] Among them, the driving chip 32 is respectively connected to the first controller 31 and the driving circuit 33, the input end of the rectifier circuit 34 is connected to the power supply, the output end of the rectifier circuit 34 is respectively connected to the input end of the driving circuit 33 and the voltage sampling circuit 35, and the output end of the voltage sampling circuit 35 is connected to the first controller 31.

[0095] The rectifier circuit 34 is used to rectify the AC power supply voltage to form a DC voltage, and provide the DC voltage to the drive circuit 33 and the voltage sampling circuit 35 .

[0096] The voltage sampling circuit 35 is used to sample the DC voltage to obtain a voltage analog signal, and send the voltage analog signal to the first controller 31 .

[0097] The first controller 31 is used for:

[0098] Obtain the resistance value and rated voltage of the defrost heater 23, and then when the defrost instruction is obtained, determine the PWM duty cycle according to the resistance value, rated voltage and voltage simulation signal, and determine that the working power of the defrost heater 23 is the first power according to the PWM duty cycle, and send a drive signal corresponding to the PWM duty cycle to the drive circuit 33, and the drive signal is used to control the working power of the defrost heater 23 to be the first power.

[0099] The driving circuit 33 is used to drive the defrost heater 23 to operate according to the driving signal and the DC voltage.

[0100] The defrost instruction may be sent by the main controller 104 to the first controller 31 .

[0101] It can be understood that the voltage analog signal is an analog signal corresponding to the DC voltage, and the first controller 31 determines the PWM duty cycle according to the following formula:

[0102]

[0103] Wherein, V0 is the rated voltage of the defrost heater 23, V bus is the DC voltage of the defrost heater 23, V bus It may be determined by the first controller 31 according to the voltage analog signal, where D is the PWM duty cycle.

[0104] After determining the PWM duty cycle, the defrost heater 23 can be equivalent to a resistor. Then, the first controller 31 determines the working power of the defrost heater 23 according to formula (2):

[0105]

[0106] Wherein, P is the working power of the defrost heater 23.

[0107] Formula (1) is determined according to the following formula (2) and formula (3):

[0108]

[0109] Wherein, P0 is the rated power of the defrost heater 23, and R is the resistance value of the defrost heater 23. If P=P0, formula (1) can be determined according to formula (2) and formula (3).

[0110] In other words, the PWM duty cycle can be used to output any analog voltage not greater than the maximum voltage value. Figure 4 The relationship between the PWM duty cycle and the output voltage is shown in FIG. Figure 4 As shown, taking the maximum voltage value of 5V as an example, if the PWM duty cycle is 50%, then the high level duration of the driving signal is half, and the low level duration is half. At a certain frequency, a 2.5V output voltage can be simulated. For example, if the PWM duty cycle is 75%, a 3.75V output voltage can be simulated. Since the resistance value of the defrost heater 23 remains unchanged, the working power P of the defrost heater 23 is proportional to V bus So, by controlling the PWM duty cycle, the working power P can be controlled.

[0111] In a possible implementation, the driver chip 32 may be a three-phase high-voltage gate driver.

[0112] In this embodiment, the first controller 31 can determine the PWM duty cycle according to the acquired defrost instruction and the voltage analog signal corresponding to the DC voltage, so as to achieve constant power control of the defrost heater.

[0113] Next, the specific circuit structure of the voltage sampling circuit 35 is described in detail.

[0114] Figure 5 A schematic diagram of the structure of a voltage sampling circuit 35 provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the voltage sampling circuit 35 includes: a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor.

[0115] The first end of the first resistor is connected to the output end of the rectifier circuit 34 , and the first resistor is connected in series with the second resistor and the third resistor through the second end.

[0116] The first ends of the third resistor and the fourth resistor are connected through a first connecting line, the first end of the first capacitor is connected to the first connecting line, and the second end of the first capacitor is connected to the second end of the fourth resistor.

[0117] The second end of the first capacitor serves as an output end of the voltage sampling circuit 35 and is connected to the first controller 31 .

[0118] In this embodiment, voltage sampling can be implemented by a simple voltage sampling circuit 35 to obtain an analog voltage signal corresponding to the DC voltage.

[0119] Next, the specific circuit structure of the driving circuit 33 will be described in detail.

[0120] Figure 6 A schematic diagram of the structure of a driving circuit 33 provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the driving circuit 33 includes: a first diode, a transistor, a current sampling resistor, a fifth resistor, a sixth resistor, a seventh resistor and a second diode.

[0121] Among them, the cathode of the first diode is connected to the output end of the rectifier circuit 34, the first end of the seventh resistor is connected to the first end of the current sampling resistor through the second connecting line, the second end of the current sampling resistor is grounded, and the second end of the seventh resistor is connected to the sixth resistor through the third connecting line.

[0122] The anode of the first diode is connected to the defrost heater 23 and the collector of the transistor, the gate of the transistor is connected to the fifth resistor and the third connection line, and the emitter of the transistor is connected to the second connection line.

[0123] The fifth resistor is connected to the first output interface of the driving chip 32 through the fourth connecting line, the sixth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the fourth connecting line.

[0124] The first output interface of the driving chip 32 is connected to the fourth connection line, and the first input interface of the driving chip 32 is connected to the first controller 31. Specifically, the first input interface of the driving chip 32 is connected to the first controller 31 through a resistor.

[0125] The transistor can be an insulated gate bipolar transistor (IGBT) or a metal-oxide semiconductor field-effect transistor, abbreviated as metal-oxide-semiconductor field-effect transistor (MOSFET). Figure 6 and Figure 8 Take IGBT as an example.

[0126] In one possible implementation, Figure 6 As shown, the first controller 31 is connected to the main controller 104 , and when the frost layer on the evaporator 22 meets the defrosting condition, the main controller 104 sends a defrosting instruction to the first controller 31 .

[0127] In addition, in order to power the first controller 31, a power supply can be connected through a power supply interface, wherein the connection is through a resistor and a capacitor. The resistor can be used to prevent input voltage jitter and interference and stabilize the voltage signal input, and the capacitor can improve the stability and reliability of the circuit.

[0128] In this embodiment, the defrost heater 23 can be driven to operate according to the driving signal sent by the controller of the driving circuit 33 and the DC voltage provided by the rectifier circuit 34 through the driving circuit 33 .

[0129] Next, the specific circuit structure of the rectifier circuit 34 will be described in detail.

[0130] Figure 7 A structural diagram of a rectifier circuit 34 provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the rectifier circuit 34 includes: a fuse, a thermistor, a first circuit, an inductor, a rectifier bridge stack and a filter capacitor;

[0131] A first end of the fuse is connected to a power source, a second end of the fuse is connected to a second end of the thermistor through a fifth connecting line, and a first end of the thermistor is connected to the inductor.

[0132] The inductor is connected to the second end of the rectifier bridge stack, the first end of the rectifier bridge stack is connected to the voltage sampling circuit 35 through the sixth connecting line, the drive circuit 33 is connected to the sixth connecting line, the first end of the filter capacitor is connected to the sixth connecting line, the second end of the filter capacitor is connected to the fourth end of the rectifier bridge stack, and the third end of the rectifier bridge stack is connected to the inductor.

[0133] like Figure 7 As shown, the output end of the rectifier circuit 34 is the connection point between the voltage sampling circuit 35 and the drive circuit 33 and the sixth connection line.

[0134] In one possible implementation, Figure 7 As shown, the first circuit includes a first discharge resistor, a second discharge resistor, a third discharge resistor and a second capacitor, wherein the first discharge resistor, the second discharge resistor and the third discharge resistor are connected in series and then connected in parallel with the second capacitor. By setting the discharge resistor in the rectifier circuit 34, the stability and reliability of the circuit are maintained.

[0135] In a possible implementation, the rectifier circuit 34 further includes a varistor, which is connected to the fifth connection line and the ground line of the power supply, respectively. By providing the varistor in the rectifier circuit 34, surge voltage can be prevented.

[0136] Understandably, Figure 7 The three capacitors (capacitor 1, capacitor 2 and capacitor 3) are all components required for the circuit, and CN1 and CN2 are ground wire interfaces.

[0137] For ease of viewing, Figure 8 This is a schematic diagram of the overall circuit of the driving component 103 provided in this application.

[0138] In the above circuit diagrams, 1 of IGBT represents the gate, 2 represents the collector, and 3 represents the emitter. In other components, 1, 2, 3, and 4 represent the first end, the second end, the third end, and the fourth end, respectively. For example, 1 of the first resistor represents the first end, 2 of the first resistor represents the second end, 1 of the rectifier bridge stack represents the first end, 2 of the rectifier bridge stack represents the second end, 3 of the rectifier bridge stack represents the third end, and 4 of the rectifier bridge stack represents the fourth end.

[0139] Fig. 9 The present invention provides a flow chart of a method for controlling a defrost heater of a refrigerator. The execution subject of the method may be the driving component in the above embodiment, such as Fig. 9 As shown, the method comprises the following steps:

[0140] S901, rectifying the AC voltage of the defrost heater to form a DC voltage.

[0141] S902: When a defrost instruction is received, a PWM duty cycle is determined according to a rated voltage and a DC voltage of the defrost heater.

[0142] S903: Determine, according to the PWM duty cycle, that the working power of the defrost heater is a first power.

[0143] S904, controlling the defrost heater to operate at the first power.

[0144] In this embodiment, the AC power supply voltage of the defrost heater is rectified to form a DC voltage. When a defrost command is received, the PWM duty cycle is determined according to the rated voltage and the DC voltage of the defrost heater. Then, according to the PWM duty cycle, the working power of the defrost heater is determined to be the first power. The defrost heater is controlled to operate at the first power. The working power of the defrost heater can be automatically adjusted to meet its DC power supply requirements and achieve constant power control.

[0145] Fig.10 This is a flow chart of another control method for a defrost heater of a refrigerator provided by the present application. The execution subject of the method may be the driving component in the above embodiment, such as Fig.10 As shown, the method comprises the following steps:

[0146] S1001. Rectify the AC power supply voltage through a rectifier circuit to form a DC voltage, and provide the DC voltage to a drive circuit and a voltage sampling circuit.

[0147] S1002: Sampling the DC voltage through a voltage sampling circuit to obtain a voltage analog signal, and sending the voltage analog signal to the first controller.

[0148] S1003. Obtain the resistance value and rated voltage of the defrost heater through the first controller.

[0149] S1004. When a defrost instruction is obtained, the first controller determines a PWM duty cycle according to the resistance value, the rated voltage and the voltage simulation signal.

[0150] S1005. Determine, through the first controller, that the working power of the defrost heater is the first power according to the PWM duty cycle.

[0151] S1006. Send a driving signal corresponding to the PWM duty cycle to the driving circuit through the first controller, where the driving signal is used to control the working power of the defrost heater to be the first power.

[0152] S1007: Drive the defrost heater to operate according to the drive signal and the DC voltage through the drive circuit.

[0153] In this embodiment, the AC power supply voltage is rectified by a rectifier circuit to form a DC voltage, and the DC voltage is provided to the driving circuit and the voltage sampling circuit. The DC voltage is sampled by the voltage sampling circuit to obtain a voltage analog signal, and the voltage analog signal is sent to the first controller. The resistance value and rated voltage of the defrost heater are obtained by the first controller. When the defrost instruction is obtained, the PWM duty cycle is determined according to the resistance value, the rated voltage and the voltage analog signal. According to the PWM duty cycle, the working power of the defrost heater is determined to be the first power, and a driving signal corresponding to the PWM duty cycle is sent to the driving circuit. The driving signal is used to control the working power of the defrost heater to be the first power. The defrost heater is driven to run according to the driving signal and the DC voltage by the driving circuit. The driving component can be driven to automatically adjust the working power of the defrost heater to meet its DC power supply requirements and realize constant power control.

[0154] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores computer execution instructions, and the computer execution instructions are used for the methods in the above embodiments.

[0155] The present application also provides a computer program product, which includes a computer program stored in a readable storage medium. When the computer program is executed by a computer, the technical solution shown in the above method embodiment is executed. The specific implementation method and technical effect are similar and will not be repeated here.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0157] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0158] In this application, "multiple" means two or more. The first, second, etc. descriptions that appear in the embodiments of this application are only used for illustration and distinction of the described objects. There is no order, nor does it represent a special limitation on the number of devices in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not represent the difference in size, priority, or importance of the two thresholds.

[0159] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0160] In this application, "of", "corresponding, relevant", "corresponding", and "associated" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. In the embodiments of this application, communication and transmission can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. For example, transmission can include sending and / or receiving, which can be a noun or a verb.

Claims

1. A refrigerator, characterized in that: The refrigerator comprises: A box body, used to define the storage space of the refrigerator; A refrigeration system arranged in the box includes a compressor, an evaporator, and a defrost heater arranged on one side of the evaporator, wherein the compressor provides power for the refrigeration cycle of the refrigerator, and the defrost heater is used to remove frost on the evaporator; The driving assembly connected to the defrost heater is used for: Rectifying the AC voltage supplied to the defrost heater to form a DC voltage; When a defrost instruction is obtained, a pulse width modulation (PWM) duty cycle is determined according to the rated voltage of the defrost heater and the DC voltage; According to the PWM duty cycle, determining that the working power of the defrost heater is a first power; The defrost heater is controlled to operate at the first power.

2. The refrigerator according to claim 1, characterized in that: The driving component includes a driving chip, a first controller, a driving circuit, a rectifying circuit and a voltage sampling circuit; The driving chip is connected to the first controller and the driving circuit respectively, the input end of the rectifier circuit is connected to a power supply, the output end of the rectifier circuit is connected to the input end of the driving circuit and the voltage sampling circuit respectively, and the output end of the voltage sampling circuit is connected to the first controller; The rectifier circuit is used to rectify the power supply AC voltage to form the DC voltage, and provide the DC voltage to the drive circuit and the voltage sampling circuit; The voltage sampling circuit is used to sample the DC voltage to obtain a voltage analog signal, and send the voltage analog signal to the first controller; The first controller is used for: Obtaining the resistance value and rated voltage of the defrost heater; When the defrost instruction is obtained, determining the PWM duty cycle according to the resistance value, the rated voltage and the voltage simulation signal; According to the PWM duty cycle, determining that the working power of the defrost heater is a first power; sending a driving signal corresponding to the PWM duty cycle to the driving circuit, wherein the driving signal is used to control the working power of the defrost heater to be the first power; The driving circuit is used to drive the defrost heater to operate according to the driving signal and the DC voltage.

3. The refrigerator according to claim 2, characterized in that: The voltage sampling circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor; The first end of the first resistor is connected to the output end of the rectifier circuit, and the first resistor is connected in series with the second resistor and the third resistor through the second end; The first end of the third resistor is connected to the first end of the fourth resistor through a first connecting line, the first end of the first capacitor is connected to the first connecting line; the second end of the first capacitor is connected to the second end of the fourth resistor; The second end of the first capacitor serves as an output end of the voltage sampling circuit and is connected to the first controller.

4. The refrigerator according to claim 2 or 3, characterized in that: The driving circuit comprises: a first diode, a transistor, a current sampling resistor, a fifth resistor, a sixth resistor, a seventh resistor and a second diode; The cathode of the first diode is connected to the output end of the rectifier circuit, the first end of the seventh resistor is connected to the first end of the current sampling resistor through a second connecting line, the second end of the current sampling resistor is grounded, and the second end of the seventh resistor is connected to the sixth resistor through a third connecting line; The anode of the first diode is connected to the defrost heater and the collector of the transistor respectively, the gate of the transistor is connected to the fifth resistor and the third connecting line, and the emitter of the transistor is connected to the second connecting line; The fifth resistor is connected to the first output interface of the driving chip through a fourth connecting line, the sixth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the fourth connecting line; The first output interface of the driving chip is connected to the fourth connecting line; the first input interface of the driving chip is connected to the first controller.

5. The refrigerator according to claim 2 or 3, characterized in that: The rectifier circuit includes: a fuse, a thermistor, a first circuit, an inductor, a rectifier bridge and a filter capacitor; The first end of the fuse is connected to the power supply, the second end of the fuse is connected to the second end of the thermistor through a fifth connecting line, and the first end of the thermistor is connected to the inductor; The inductor is connected to the second end of the rectifier bridge stack, the first end of the rectifier bridge stack is connected to the voltage sampling circuit through the sixth connecting line, and the drive circuit is connected to the sixth connecting line; the first end of the filter capacitor is connected to the sixth connecting line, the second end of the filter capacitor is connected to the fourth end of the rectifier bridge stack, and the third end of the rectifier bridge stack is connected to the inductor.

6. The refrigerator according to claim 5, characterized in that: The first circuit includes a first discharge resistor, a second discharge resistor, a third discharge resistor and a second capacitor; The first discharge resistor, the second discharge resistor and the third discharge resistor are connected in series and then connected in parallel with the second capacitor.

7. The refrigerator according to claim 5 or 6, characterized in that: The rectifier circuit also includes a varistor; The varistor is connected to the fifth connecting line and a ground line of the power supply respectively.

8. The refrigerator according to any one of claims 1 to 7, characterized in that: The refrigerator further comprises a main controller; the driving assembly comprises a first controller; the first controller is connected to the main controller; The main controller is used to send the defrost instruction to the first controller when the frost layer on the evaporator meets the defrost condition.

9. A method for controlling a defrost heater of a refrigerator, characterized in that: The refrigerator comprises: a box body defining a storage space of the refrigerator, a refrigeration system arranged in the box body, a defrost heater arranged in the refrigeration system, and a driving assembly connected to the defrost heater; Wherein, the refrigeration system comprises: a compressor and an evaporator, and the defrost heater is arranged on one side of the evaporator to remove the frost layer on the evaporator; The method comprises: Rectifying the AC voltage supplied to the defrost heater to form a DC voltage; When receiving a defrost instruction, determining a pulse width modulation (PWM) duty cycle according to the rated voltage of the defrost heater and the DC voltage; According to the PWM duty cycle, determining that the working power of the defrost heater is a first power; The defrost heater is controlled to operate at the first power.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method of claim 9 is implemented.

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