Variable-frequency refrigerator control system and variable-frequency refrigerator
By integrating a three-phase bridge inverter circuit on the control circuit board of the variable frequency refrigerator and adopting the top heat dissipation method, the problems of large area and processing complexity of the inverter circuit are solved, and the effect of reducing the weight of the circuit board and processing costs is achieved.
Patent Information
- Application Number
- CN202421613888.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-09
AI Technical Summary
In the control circuit board of the existing variable frequency refrigerator, the inverter circuit occupies a large area, resulting in an increase in the weight and processing cost of the circuit board. At the same time, it is necessary to process heat dissipation through holes on the PCB board, which increases the processing complexity.
The inverter circuit module consisting of a circuit layer with an integrated three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer is adopted. The top heat dissipation method is adopted to reduce the number of pads and the total area and avoid processing of heat dissipation through holes.
Under the premise that the function remains unchanged, the total weight and processing cost of the circuit board are reduced, and the processing cost of the variable frequency refrigerator control system is reduced.
Smart Images
Figure CN222951338U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of variable frequency air conditioners, and particularly relates to a variable frequency refrigerator control system and a variable frequency refrigerator. Background Art
[0002] In the control circuit board of the variable frequency refrigerator, an inverter circuit is usually provided. The inverter circuit is usually a bridge inverter circuit composed of multiple switch tubes (such as MOS transistors, i.e., metal oxide semiconductor field effect transistors) and connecting wires. The bridge inverter circuit is used to convert the input direct current into three-phase current and input it into the three-phase winding of the refrigeration motor of the variable frequency refrigerator to drive the refrigerator of the variable frequency refrigerator to operate. In the control circuit board of the existing variable frequency refrigerator, the switch tubes of the inverter circuit are arranged on the PCB board in a dispersed manner, resulting in the inverter circuit occupying a large area in the circuit board, thereby increasing the weight and processing cost of the circuit board; in addition, in the design of the circuit board, the bottom heat dissipation form is usually adopted (i.e., a heat dissipation layer is arranged on the back of the PCB board for heat dissipation). Therefore, it is necessary to process heat dissipation through holes at the position corresponding to each switch tube on the PCB board and fill the heat conductive metal in the heat dissipation through holes so as to transfer the heat of the switch tube to the heat dissipation layer, thereby further increasing the processing cost.
[0003] Therefore, the existing technology needs to be improved and developed. Utility Model Content
[0004] The purpose of the present application is to provide a variable frequency refrigerator control system and a variable frequency refrigerator, by providing a variable frequency refrigerator control circuit board with an inverter circuit module consisting of a circuit layer integrated with a three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer, adopting top heat dissipation and integrating the three-phase bridge inverter circuit into the circuit layer, while maintaining the function unchanged, reducing the number of pads and the total area of the circuit board, and avoiding processing heat dissipation holes on the PCB board, thereby reducing the total weight and processing cost of the circuit board, and reducing the processing cost of the variable frequency refrigerator control system.
[0005] In a first aspect, the present application provides a variable frequency refrigerator control system, comprising a PCB board and a variable frequency control circuit arranged on the PCB board, the variable frequency control circuit comprising an input end for connecting to a DC power supply, an inverter circuit module and a three-phase current output end for connecting to a refrigeration motor, the inverter circuit module comprising a circuit layer integrated with a three-phase bridge inverter circuit and a heat dissipation layer arranged on top of the circuit layer.
[0006] The present application provides a variable frequency refrigerator control system, which is provided with a variable frequency refrigerator control circuit board having an inverter circuit module composed of a circuit layer integrated with a three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer. It adopts top heat dissipation and integrates the three-phase bridge inverter circuit into the circuit layer. Under the premise of unchanged function, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board, and reducing the processing cost of the variable frequency refrigerator control system.
[0007] Optionally, the three-phase bridge inverter circuit in the circuit layer is provided with switching tubes, which include switching tubes V1 and V4 constituting the first bridge arm, switching tubes V2 and V5 constituting the second bridge arm, and switching tubes V3 and V6 constituting the third bridge arm, and the switching tubes are MOSFET tubes, IGBT tubes, BJT tubes or thyristors.
[0008] Optionally, the three-phase current output end includes a U-phase interface, a V-phase interface and a W-phase interface, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected to the U-phase interface, the V-phase interface and the W-phase interface.
[0009] Optionally, the input end includes a positive electrode and a negative electrode, and the inverter circuit module is electrically connected to the positive electrode and the negative electrode respectively.
[0010] Optionally, a heat-conducting insulating layer is provided between the circuit layer and the heat dissipation layer;
[0011] The thermally conductive insulating layer is used to conduct the heat of the circuit layer to the heat dissipation layer.
[0012] The present application provides a variable frequency refrigerator control system, which sets a thermally conductive insulating layer between the circuit layer and the heat dissipation layer of the variable frequency refrigerator control circuit board so that the heat of the circuit layer is smoothly transferred to the heat dissipation layer, thereby achieving the effect of top heat dissipation.
[0013] Optionally, the frequency conversion control circuit further includes a driving chip disposed on the PCB board, and the driving chip is electrically connected to the inverter circuit module and the frequency conversion main control MCU respectively.
[0014] The present application provides a variable frequency refrigerator control system, which outputs a PWM (pulse width modulation) signal to an inverter circuit module through a driver chip arranged on a PCB board to adjust the duty cycle of a switch tube in a circuit layer, thereby adjusting the current size and direction in the inverter circuit module to achieve the purpose of controlling the motor body.
[0015] Optionally, the frequency conversion control circuit further includes a filter capacitor disposed on the PCB board, and the filter capacitor is connected in parallel with the inverter circuit module between the positive electrode and the negative electrode of the input end.
[0016] Optionally, the frequency conversion control circuit also includes a current sampling resistor arranged on the PCB board, the current sampling resistor is connected in series between the inverter circuit module and the negative pole of the input end and is electrically connected to the drive chip, and the current sampling resistor is used to assist the drive chip in collecting the current of the frequency conversion control circuit.
[0017] Optionally, the refrigeration motor includes a refrigerator, a drive motor and a sensor, and the refrigerator, the drive motor and the sensor are electrically connected to each other; the sensor is electrically connected to the frequency conversion main control MCU, and is used to detect the working parameters of the drive motor and feed them back to the frequency conversion main control MCU.
[0018] In a second aspect, the present application provides a variable frequency refrigerator, comprising the variable frequency refrigerator control system, power supply and rectifier described above, wherein the rectifier is electrically connected to the power supply and the variable frequency refrigerator control system respectively; the rectifier is used to convert the alternating current input by the power supply into direct current.
[0019] From the above, it can be seen that the variable frequency refrigerator control system and the variable frequency refrigerator of the utility model, by providing a variable frequency refrigerator control circuit board with an inverter circuit module composed of a circuit layer integrating a three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer, adopts top heat dissipation and integrates the three-phase bridge inverter circuit into the circuit layer. Under the premise of unchanged function, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board, and reducing the processing cost of the variable frequency refrigerator control system.
[0020] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 A circuit diagram of a variable frequency refrigerator control system provided in an embodiment of the present application.
[0022] Figure 2 A structural schematic diagram of a side view of a variable frequency refrigerator control circuit board provided in an embodiment of the present application.
[0023] Figure 3 A schematic diagram of the structure of a top view of a variable frequency refrigerator control circuit board provided in an embodiment of the present application.
[0024] Figure 4 A circuit diagram of a variable frequency refrigerator provided in an embodiment of the present application.
[0025] Explanation of the reference numbers: 1. Inverter refrigerator control circuit board; 2. Refrigeration motor; 3. Inverter main control MCU; 4. PCB board; 5. Inverter circuit module; 6. Circuit layer; 7. Heat dissipation layer; 8. Thermal insulation layer; 9. Driver chip; 10. Filter capacitor; 11. Current sampling resistor; 12. Power supply; 13. Rectifier. DETAILED DESCRIPTION
[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0028] like Figure 1 , Figure 2 , Figure 3 As shown, a variable frequency refrigerator control system of the utility model comprises a variable frequency refrigerator control circuit board 1, a refrigeration motor 2 and a variable frequency main control MCU3 which are interconnected, and is characterized in that the variable frequency refrigerator control circuit board 1 comprises a PCB board 4 and a variable frequency control circuit arranged on the PCB board 4, the variable frequency control circuit comprises an input end for connecting to a DC power supply, an inverter circuit module 5 and a three-phase current output end for connecting to the refrigeration motor 2, the inverter circuit module 5 comprises a circuit layer 6 integrated with a three-phase bridge inverter circuit and a heat dissipation layer 7 arranged on the top of the circuit layer 6.
[0029] like Figure 1 As shown, Figure 1 The circuit diagram of a variable frequency refrigerator control system provided by the embodiment of the present application, wherein U+ is the positive pole of the input terminal and U- is the negative pole of the input terminal. Figure 3It can be seen that the current enters the variable frequency refrigerator control circuit board 1 from the input end, and after the current is filtered by the filter capacitor 10 (for the introduction of the filter capacitor 10, see below) to stabilize the voltage, the current is input to the inverter circuit module 5, and the current is input to the inverter circuit module 5. The inverter main control MCU3 connected to the driver chip 9 (for the introduction of the driver chip 9, see below) controls the driver chip 9 to adjust the current size and direction in the inverter circuit module 5 and adjust the current from the fixed grid frequency to a frequency that varies within a certain range (that is, the fixed grid frequency of 50Hz is changed to a variable frequency of 30-130Hz) to form a three-phase current, and output the three-phase current to the refrigeration motor 2 at the three-phase current output end. Among them, the variable frequency main control MCU3 controls the inverter circuit module 5 by outputting a PWM (pulse width modulation) signal to the driver chip 9, thereby adjusting the current size, direction and frequency in the inverter circuit module 5 by adjusting the duty cycle of the switch tube in the circuit layer 6 to control the refrigeration function of the refrigeration motor 2.
[0030] The present application provides a variable frequency refrigerator control system, which is provided with a variable frequency refrigerator control circuit board having an inverter circuit module composed of a circuit layer integrated with a three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer. It adopts top heat dissipation and integrates the three-phase bridge inverter circuit into the circuit layer. Under the premise of unchanged function, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board, and reducing the processing cost of the variable frequency refrigerator control system.
[0031] like Figure 1 As shown, Figure 1 3 is the circuit layer of the variable frequency refrigerator control circuit board 1, wherein V1, V2, V3, V4, V5, and V6 are switch tubes, the connection point between the switch tube V1 and the switch tube V4 is connected to the U phase interface, the connection point between the switch tube V2 and the switch tube V5 is connected to the V phase interface, and the connection point between the switch tube V3 and the switch tube V6 is connected to the W phase interface. The variable frequency main control MCU3 inputs PWM to the switch tube V1, the switch tube V2, the switch tube V3, the switch tube V4, the switch tube V5, and the switch tube V6 through the driving chip 9, respectively, to adjust the duty cycle of the switch tube V1, the switch tube V2, the switch tube V3, the switch tube V4, the switch tube V5, and the switch tube V6, thereby controlling the current size, direction, and frequency in the inverter circuit module 2.
[0032] Specifically, the three-phase bridge inverter circuit in the circuit layer 3 is provided with 6 switching tubes, which include switch tube V1 and switch tube V4 constituting the first bridge arm, switch tube V2 and switch tube V5 constituting the second bridge arm, and switch tube V3 and switch tube V6 constituting the third bridge arm; switch tube V1, switch tube V2, switch tube V3, switch tube V4, switch tube V5 and switch tube V6 can be but are not limited to MOSFET tubes, IGBT tubes, BJT tubes or thyristors.
[0033] In a specific application, the six switch tubes of the three-phase bridge inverter circuit in the circuit layer 3 include switch tubes V1 and V4 constituting the first bridge arm, switch tubes V2 and V5 constituting the second bridge arm, and switch tubes V3 and V6 constituting the third bridge arm. By adjusting the duty ratio of switch tubes V1, V2, V3, V4, V5, and V6, the current size, direction, and frequency in the inverter circuit module 2 can be controlled. Among them, the multiple switch tubes can be, but are not limited to, MOSFET tubes, IGBT tubes, BJT tubes, or thyristors.
[0034] Integrating the three-phase bridge inverter circuit into the circuit layer 6 can reduce the area occupied by the inverter circuit module 5 in the PCB board 4, and can adjust the layout of the variable frequency refrigerator control circuit board 1. Under the premise of unchanged function, the number and area of the pads of the PCB board 4 can be reduced, and the weight of the PCB board 4 can be reduced. Moreover, the heat dissipation layer 7 can be directly set on the top of the circuit layer 6 to dissipate the heat of the circuit layer 6 into the air.
[0035] Specifically, the three-phase current output end includes a U-phase interface, a V-phase interface and a W-phase interface, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected to the U-phase interface, the V-phase interface and the W-phase interface.
[0036] In a specific application, the first bridge arm, the second bridge arm and the third bridge arm are respectively connected to the interface U, the interface V and the interface W of the three-phase current output end, specifically, the connection point between the switch tube V1 and the switch tube V4 is connected to the U phase interface, the connection point between the switch tube V2 and the switch tube V5 is connected to the V phase interface, and the connection point between the switch tube V3 and the switch tube V6 is connected to the W phase interface. Through the three interfaces of the three-phase current output end, the first bridge arm, the second bridge arm and the third bridge arm are respectively connected to the three-phase winding of the motor body 9.
[0037] Specifically, the input end includes a positive electrode and a negative electrode, and the inverter circuit module 5 is electrically connected to the positive electrode and the negative electrode respectively;
[0038] In a specific application, the frequency conversion refrigerator control system is connected to a DC power supply through the positive and negative electrodes, and connected to the inverter circuit module 5 to supply power to the refrigeration motor 2 and the frequency conversion main control MCU 3.
[0039] Specifically, a heat-conducting insulating layer 8 is provided between the circuit layer 6 and the heat dissipation layer 7;
[0040] The thermally conductive insulating layer 8 is used to conduct the heat of the circuit layer 6 to the heat dissipation layer 7 .
[0041] In specific applications, the heat-conducting insulating layer 8 is used to conduct the heat of the circuit layer 6 to the heat-dissipating layer 7, so as to ensure the stability of the electrical performance of the variable frequency refrigerator control circuit board 1. The heat-dissipating layer 7 can be, but is not limited to, a heat sink; the heat-conducting insulating layer 8 is a heat-conducting organic silicone grease-like composite made of organic silicone as the main raw material and adding materials with excellent heat resistance and thermal conductivity, and the heat-conducting insulating layer 8 can be, but is not limited to, a phase-change heat-conducting insulating material, a heat-conducting tape, a heat-conducting insulating elastic rubber, a heat-conducting filler or a heat-conducting insulating potting glue.
[0042] Specifically, the frequency conversion control circuit further includes a driving chip 9 disposed on the PCB board 4 , and the driving chip 9 is electrically connected to the inverter circuit module 5 and the frequency conversion main control MCU 3 , respectively.
[0043] In a specific application, the driver chip 9 sends a PWM (pulse width modulation) signal output by the frequency conversion main control MCU3 to the inverter circuit module 5 to adjust the duty cycle of the switch tube in the circuit layer 6, thereby adjusting the current size, direction and frequency in the inverter circuit module 5 to control the refrigeration function of the refrigeration motor 2.
[0044] Specifically, the frequency conversion control circuit further includes a filter capacitor 10 disposed on the PCB board 4; the filter capacitor 10 is connected in parallel with the inverter circuit module 5 between the positive electrode and the negative electrode of the input end.
[0045] In a specific application, the filter capacitor 10 is used to filter the current to stabilize the voltage of the current. The filter capacitor 10 may include at least one capacitor, and the specific number may be set according to actual needs.
[0046] Specifically, the frequency conversion control circuit also includes a current sampling resistor 11 arranged on the PCB board 4. The current sampling resistor 11 is connected in series between the inverter circuit module 5 and the negative pole of the input end and is electrically connected to the drive chip 9. The current sampling resistor 11 is used to assist the drive chip 9 in collecting the current of the frequency conversion control circuit.
[0047] In a specific application, the current of the frequency conversion control circuit (the frequency conversion control circuit is a series circuit) is obtained by obtaining the current of the current sampling resistor 11 to prevent excessive current from occurring when the circuit is working and protect the safety of the frequency conversion control circuit.
[0048] Specifically, the refrigeration motor 2 includes a refrigerator, a drive motor and a sensor, which are electrically connected to each other. The sensor is electrically connected to the frequency conversion main control MCU3 and is used to detect the working parameters of the drive motor and feed them back to the frequency conversion main control MCU3.
[0049] In a specific application, the driving motor of the refrigeration motor 2 is connected to the inverter circuit module 5 of the variable frequency refrigerator control circuit board 1, and the sensor of the refrigeration motor 2 is connected to the variable frequency main control MCU3. The sensor feeds back the detected working parameters of the driving motor to the variable frequency main control MCU3, and the variable frequency main control MCU3 outputs a PWM signal to the driving chip 9 to control the driving chip 9, thereby adjusting the current size, direction and frequency in the inverter circuit module 5 by adjusting the duty cycle of the switch tube in the circuit layer 6. Among them, at least one sensor can be set, and the sensor includes but is not limited to a temperature sensor, a speed sensor and a current sensor.
[0050] like Figure 4 As shown, Figure 4 The circuit diagram of the variable frequency refrigerator provided in the embodiment of the present application. The variable frequency refrigerator includes the variable frequency refrigerator control system, power supply 12 and rectifier 13 described above (in some embodiments, rectifier 13 may not be provided, but needs to be directly connected to a DC power supply), and rectifier 13 is electrically connected to power supply 12 and variable frequency refrigerator control system respectively. The electric energy (current) provided by the power supply 12 passes through the rectifier 13, and the current is converted from AC to DC. Then the current enters the variable frequency refrigerator control circuit board 1 from the input end. After the current is filtered by the filter capacitor 10 to stabilize the voltage, the stabilized current will be input into the inverter circuit module 5, and output to the drive motor of the refrigeration motor 2 at the three-phase current output end of the inverter circuit module 5. In response to the input current, the drive motor drives the refrigerator to operate. At the same time, the sensor sends a feedback signal to the variable frequency main control MCU3 based on the temperature in the variable frequency refrigerator (that is, the temperature of the cold storage room and / or freezer of the variable frequency refrigerator) and the refrigeration speed of the refrigerator. The variable frequency main control MCU3 outputs a PWM signal to the drive chip 9 based on the feedback signal. The drive chip 9 controls the duty cycle of the switch tube in the inverter circuit module 5 based on the PWM signal to adjust the current size, direction and frequency in the inverter circuit module 5, thereby controlling the refrigeration capacity of the refrigerator, and controlling the refrigeration function of the refrigerator 10, ensuring that the variable frequency refrigerator is always in the best operating state, effectively balancing the temperature in the variable frequency refrigerator, and reducing the energy consumption of the variable frequency refrigerator during operation.
[0051] In some embodiments, the variable frequency refrigerator further includes an overload protector disposed in the refrigeration motor 2, and the overload protector is used to protect the circuit of the variable frequency refrigerator.
[0052] Through this technical solution, a variable frequency refrigerator control circuit board is provided with an inverter circuit module consisting of a circuit layer integrated with a three-phase bridge inverter circuit and a heat dissipation layer arranged on the top of the circuit layer. Top heat dissipation and integration of the three-phase bridge inverter circuit into the circuit layer are adopted. Under the premise of unchanged functions, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board, and reducing the processing cost of the variable frequency refrigerator control system.
[0053] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A variable frequency refrigerator control system, comprising a variable frequency refrigerator control circuit board (1), a refrigeration motor (2) and a variable frequency main control MCU (3) connected to each other, characterized in that: The variable frequency refrigerator control circuit board (1) comprises a PCB board (4) and a variable frequency control circuit arranged on the PCB board (4); the variable frequency control circuit comprises an input end for connecting to a DC power supply, an inverter circuit module (5) and a three-phase current output end for connecting to the refrigeration motor (2); the inverter circuit module (5) comprises a circuit layer (6) integrated with a three-phase bridge inverter circuit and a heat dissipation layer (7) arranged on top of the circuit layer (6).
2. The variable frequency refrigerator control system according to claim 1, characterized in that: The three-phase bridge inverter circuit in the circuit layer (6) is provided with switch tubes, which include switch tubes V1 and V4 constituting a first bridge arm, switch tubes V2 and V5 constituting a second bridge arm, and switch tubes V3 and V6 constituting a third bridge arm; the switch tubes are MOSFET tubes, IGBT tubes, BJT tubes or thyristors.
3. The variable frequency refrigerator control system according to claim 2, characterized in that: The three-phase current output end includes a U-phase interface, a V-phase interface and a W-phase interface, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected to the U-phase interface, the V-phase interface and the W-phase interface.
4. The variable frequency refrigerator control system according to claim 1, characterized in that: The input end comprises a positive electrode and a negative electrode, and the inverter circuit module (5) is electrically connected to the positive electrode and the negative electrode respectively.
5. The variable frequency refrigerator control system according to claim 1, characterized in that: A heat-conducting insulating layer (8) is provided between the circuit layer (6) and the heat dissipation layer (7); The heat-conducting insulating layer (8) is used to conduct the heat of the circuit layer (6) to the heat dissipation layer (7).
6. The variable frequency refrigerator control system according to claim 1, characterized in that: The frequency conversion control circuit further comprises a drive chip (9) arranged on the PCB board (4), and the drive chip (9) is electrically connected to the inverter circuit module (5) and the frequency conversion main control MCU (3) respectively.
7. The variable frequency refrigerator control system according to claim 1, characterized in that: The frequency conversion control circuit further comprises a filter capacitor (10) arranged on the PCB board (4); the filter capacitor (10) and the inverter circuit module (5) are connected in parallel between the positive electrode and the negative electrode of the input end.
8. The variable frequency refrigerator control system according to claim 6, characterized in that: The variable frequency control circuit further comprises a current sampling resistor (11) arranged on the PCB board (4); the current sampling resistor (11) is connected in series between the inverter circuit module (5) and the negative electrode of the input end and is electrically connected to the drive chip (9); the current sampling resistor (11) is used to assist the drive chip (9) in collecting the current of the variable frequency control circuit.
9. The variable frequency refrigerator control system according to claim 1, characterized in that: The refrigeration motor (2) comprises a refrigerator, a drive motor and a sensor, wherein the refrigerator, the drive motor and the sensor are electrically connected to each other; the sensor is electrically connected to the variable frequency main control MCU (3) and is used to detect working parameters of the drive motor and feed back to the variable frequency main control MCU (3).
10. A variable frequency refrigerator, characterized in that: The invention comprises the variable frequency refrigerator control system according to claims 1 to 9, a power supply (12) and a rectifier (13), wherein the rectifier (13) is electrically connected to the power supply (12) and the variable frequency refrigerator control system respectively; and the rectifier (13) is used to convert the alternating current input by the power supply (12) into direct current.