Variable frequency air conditioner indoor fan control system and variable frequency air conditioner indoor fan
By integrating a three-phase bridge inverter circuit module on the indoor fan control circuit board of the variable frequency air conditioner 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
- CN202421613891.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The inverter circuit of existing variable frequency air conditioning indoor fans occupies a large amount of area on the circuit board, increasing the weight and processing cost of the circuit board, and requiring the processing of heat dissipation through holes on the PCB board, increasing 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 weight and processing cost of the circuit board are reduced, and the processing cost of the variable frequency air conditioner indoor fan control system is reduced.
Smart Images
Figure CN222848383U_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 air conditioner indoor fan control system and a variable frequency air conditioner indoor fan. Background Art
[0002] In the driving circuit board of the indoor fan of the variable frequency air conditioner, 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 currents and input them into the three-phase windings of the fan motor of the indoor fan of the variable frequency air conditioner to drive the fan blades of the indoor fan of the variable frequency air conditioner to rotate. In the existing circuit board of the indoor fan of the variable frequency air conditioner, 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 corresponding to the position of 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 air-conditioner indoor fan control system and a variable frequency air-conditioner indoor fan, by providing a variable frequency air-conditioner indoor fan 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 air-conditioner indoor fan control system.
[0005] In a first aspect, the present application provides a variable frequency air conditioner indoor fan 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 fan motor, the inverter circuit module comprising a circuit layer integrating 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 air-conditioner indoor fan control system, which is provided with a variable frequency air-conditioner indoor fan 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 air-conditioner indoor fan control system.
[0007] Optionally, the three-phase bridge inverter circuit in the circuit layer (4) is provided with a switch tube V1 and a switch tube V4 constituting a first bridge arm, a switch tube V2 and a switch tube V5 constituting a second bridge arm, and a switch tube V3 and a switch tube V6 constituting a third bridge arm; 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 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, a heat-conducting insulating layer is provided between the circuit layer and the heat dissipation layer;
[0010] The thermally conductive insulating layer is used to conduct the heat of the circuit layer to the heat dissipation layer.
[0011] The present application provides a variable frequency air conditioner indoor fan control system, which sets a thermal conductive insulation layer between the circuit layer and the heat dissipation layer of the variable frequency air conditioner indoor fan control circuit board so that the heat of the circuit layer can be smoothly transferred to the heat dissipation layer, thereby achieving the effect of top heat dissipation.
[0012] Optionally, the thermally conductive insulating layer is a phase-change thermally conductive insulating material, a thermally conductive tape, a thermally conductive insulating elastic rubber, a thermally conductive filler or a thermally conductive insulating potting glue.
[0013] Optionally, the variable frequency control circuit further includes a variable frequency drive chip disposed on the PCB board, and the variable frequency drive chip is electrically connected to the inverter circuit module.
[0014] The present application provides a variable frequency air conditioner indoor fan control system, which achieves the purpose of controlling the motor body by setting a variable frequency drive chip on a PCB board and outputting a PWM (pulse width modulation) signal to an inverter circuit module through the variable frequency drive chip to adjust the duty cycle of the switch tube in the circuit layer, thereby adjusting the current size and direction in the inverter circuit module.
[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 frequency conversion drive chip and the negative electrode of the input end, and the current sampling resistor is used to prevent excessive current when the circuit is working, thereby protecting the safety of the frequency conversion control circuit.
[0017] Optionally, the fan motor includes fan blades, a drive motor and a sensor, the fan blades, the drive motor and the sensor are electrically connected to each other, the sensor is electrically connected to the variable frequency drive chip, and is used to detect the working parameters of the drive motor and feed them back to the variable frequency drive chip.
[0018] In the second aspect, the present application provides a variable frequency air-conditioning indoor fan, comprising the variable frequency air-conditioning indoor fan control system, power supply and rectifier described above, the rectifier being electrically connected to the power supply and the variable frequency air-conditioning indoor fan control system respectively; the rectifier being 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 air-conditioner indoor fan control system and the variable frequency air-conditioner indoor fan of the utility model are provided with a variable frequency air-conditioner indoor fan control circuit board having 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. 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 air-conditioner indoor fan 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 air conditioner indoor fan control system provided in an embodiment of the present application.
[0022] Figure 2 A structural schematic diagram of a front view of a variable frequency air conditioner indoor fan 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 air conditioner indoor fan control circuit board provided in an embodiment of the present application.
[0024] Figure 4 A circuit diagram of a variable frequency air conditioner indoor fan provided in an embodiment of the present application.
[0025] Explanation of reference numerals: 1. Inverter air conditioner indoor fan control circuit board; 2. PCB board; 3. Inverter circuit module; 4. Circuit layer; 5. Heat dissipation layer; 6. Thermal insulation layer; 7. Inverter drive chip; 8. Filter capacitor; 9. Power supply; 10. Rectifier; 11. Fan motor; 12. Current sampling resistor. 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 air conditioner indoor fan control system of the utility model includes a variable frequency air conditioner indoor fan control circuit board 1 and a fan motor 11. The variable frequency air conditioner indoor fan control circuit board 1 includes a PCB board 2 and a variable frequency control circuit arranged on the PCB board 2. The variable frequency control circuit includes an input end for connecting to a DC power supply (the input end includes a positive electrode and a negative electrode), an inverter circuit module 3 and a three-phase current output end for connecting to the fan motor 11. The inverter circuit module 3 includes a circuit layer 4 integrated with a three-phase bridge inverter circuit and a heat dissipation layer 5 arranged on the top of the circuit layer 4.
[0029] like Figure 1 As shown, Figure 1 The circuit diagram of a variable frequency air conditioner indoor fan control system provided in 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 air conditioner indoor fan control circuit board 1 from the input end, and after the current is filtered by the filter capacitor 8 (the introduction of the filter capacitor 8 is described later) to stabilize the voltage, the current is input to the inverter circuit module 3, and the variable frequency drive chip 7 (the introduction of the variable frequency drive chip 7 is described later) connected to the inverter circuit module 3 is used to adjust the current size and direction in the inverter circuit module 3, and the current is adjusted from the fixed grid frequency to a frequency that varies within a certain range (that is, the fixed grid frequency of 50 Hz is changed to a variable frequency of 30-130 Hz) to form a three-phase current, and the three-phase current is output to the fan motor 11 at the three-phase current output end. Among them, the variable frequency drive chip 7 outputs a PWM (pulse width modulation) signal to the inverter circuit module 3 to adjust the duty cycle of the switch tube in the circuit layer 4, thereby adjusting the current size, direction and frequency in the inverter circuit module 3 to control the fan motor 11 to operate the cooling function or the heating function.
[0030] The present application provides a variable frequency air-conditioner indoor fan control system, which is provided with a variable frequency air-conditioner indoor fan 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 air-conditioner indoor fan control system.
[0031] like Figure 1 As shown, Figure 1 3 is a circuit diagram of the circuit layer of the variable frequency air conditioner indoor fan control circuit board, 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 W 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 U phase interface. The variable frequency drive chip 7 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 respectively to adjust the duty ratio 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 magnitude, direction, and frequency of the current in the inverter circuit module 3.
[0032] Specifically, the three-phase bridge inverter circuit in the circuit layer 4 is provided with 6 switching tubes, including the switching tube V1 and the switching tube V4 constituting the first bridge arm, the switching tube V2 and the switching tube V5 constituting the second bridge arm, and the switching tube V3 and the switching tube V6 constituting the third bridge arm; the switching tube V1, the switching tube V2, the switching tube V3, the switching tube V4, the switching tube V5 and the switching 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 4 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 3 can be controlled. Among them, each switch tube can be, but is not limited to, a MOSFET tube, an IGBT tube, a BJT tube, or a thyristor.
[0034] Integrating the three-phase bridge inverter circuit into the circuit layer 4 can reduce the area occupied by the inverter circuit module 3 in the PCB board 2, and can adjust the layout of the variable frequency air conditioner indoor fan control circuit board. Under the premise of unchanged function, the number and area of the pads of the PCB board 2 can be reduced, and the weight of the PCB board 2 can be reduced. Moreover, the heat dissipation layer 5 can be directly set on the top of the circuit layer 4 to dissipate the heat of the circuit layer 4 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 W-phase interface, the V-phase interface and the U-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 W, the interface V and the interface U 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 W 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 U 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, a heat-conducting insulating layer 6 is provided between the circuit layer 4 and the heat dissipation layer 5;
[0038] The thermally conductive insulating layer 6 is used to conduct the heat of the circuit layer 4 to the heat dissipation layer 5 .
[0039] In a specific application, the heat-conducting insulating layer 6 is used to conduct the heat of the circuit layer 4 to the heat dissipation layer 5, so as to ensure the stability of the electrical performance of the variable frequency air conditioner indoor fan control circuit board 1. The heat dissipation layer 5 can be, but is not limited to, a heat sink.
[0040] Specifically, the thermally conductive insulating layer 6 may be, but is not limited to, a phase-change thermally conductive insulating material, a thermally conductive tape, a thermally conductive insulating elastic rubber, a thermally conductive filler, or a thermally conductive insulating potting glue.
[0041] In specific applications, the thermally conductive insulating layer 6 is a thermally conductive silicone grease-like composite made of organic silicone as the main raw material and added with materials with excellent heat resistance and thermal conductivity. The thermally conductive insulating layer 6 can be set to any one of phase change thermally conductive insulating materials, thermal conduction tape, thermally conductive insulating elastic rubber, thermally conductive filler and thermally conductive insulating potting glue.
[0042] Specifically, the frequency conversion control circuit further includes a frequency conversion drive chip 7 disposed on the PCB board 2 , and the frequency conversion drive chip 7 is electrically connected to the inverter circuit module 3 .
[0043] In a specific application, the variable frequency drive chip 7 outputs a PWM (pulse width modulation) signal to the inverter circuit module 3 to adjust the duty cycle of the switch tube in the circuit layer 4, thereby adjusting the current size, direction and frequency in the inverter circuit module 3 to control the fan motor 11 to operate the cooling function or the heating function.
[0044] Specifically, the frequency conversion control circuit further includes a filter capacitor 8 disposed on the PCB board 2; the filter capacitor 8 is connected in parallel with the inverter circuit module 3 between the positive electrode and the negative electrode of the input end.
[0045] In a specific application, the filter capacitor 8 is used to filter the current to stabilize the voltage of the current. The filter capacitor 8 may be provided with 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 12 arranged on the PCB board 2. The current sampling resistor 12 is connected in series between the inverter circuit module 3 and the negative pole of the input end and is electrically connected to the frequency conversion drive chip 7. The current sampling resistor 12 is used to prevent excessive current from occurring when the circuit is working, thereby protecting the safety of the frequency conversion control circuit.
[0047] In a specific application, the current of the frequency conversion control circuit is obtained by obtaining the current of the current sampling resistor 12 (the current of the series circuit is equal) to prevent excessive current from occurring when the circuit is working and protect the safety of the frequency conversion control circuit.
[0048] Specifically, the fan motor 11 includes fan blades, a drive motor and a sensor. The fan blades, the drive motor and the sensor are electrically connected to each other. The sensor is electrically connected to the variable frequency drive chip 7 and is used to detect the working parameters of the drive motor and feed them back to the variable frequency drive chip 7.
[0049] In a specific application, the fan motor 11 includes a fan blade, a drive motor and a sensor. The drive motor of the fan motor 11 is connected to the inverter circuit module 3 of the variable frequency air conditioner indoor fan control circuit board 1. The sensor of the fan motor 11 is connected to the variable frequency drive chip 7 of the variable frequency air conditioner indoor fan control circuit board. The sensor is used to detect the working parameters of the drive motor and feed them back to the variable frequency drive chip 7. 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 A circuit diagram of a variable frequency air conditioner indoor fan provided in an embodiment of the present application. The variable frequency air conditioner indoor fan includes the variable frequency air conditioner indoor fan control system, power supply 9 and rectifier 10 as described above (in some embodiments, rectifier 10 may not be provided, but needs to be directly connected to a DC power supply), rectifier 10 is electrically connected to power supply 9 and variable frequency air conditioner indoor fan control system respectively, and rectifier 10 is used to convert the AC power input by power supply 9 into DC power. The electric energy (current) provided by the power supply 9 passes through the rectifier 10 to convert the current from AC to DC, and then the current enters the variable frequency air conditioner indoor fan control circuit board 1 from the input end. After the current is filtered by the filter capacitor 8 to stabilize the voltage, the stabilized current will be input into the inverter circuit module 3, and output to the drive motor of the fan motor 11 at the three-phase current output end of the inverter circuit module 3. In response to the input current, the drive motor drives the fan blades to rotate. At the same time, the sensor sends a feedback signal to the variable frequency drive chip 7 based on the temperature of the surrounding environment and the speed of the fan blades. The variable frequency drive chip 7 controls the duty cycle of the switch tube in the inverter circuit module 3 based on the feedback signal to adjust the current size, direction and frequency in the inverter circuit module 3, thereby controlling the mode of the fan motor 11 (i.e., cooling function or heating function) and controlling the speed of the fan blades (wind strength) and the temperature of the wind, so as to control the fan motor 11 to operate the cooling function or heating function.
[0051] In some embodiments, the variable frequency air conditioner indoor fan further includes an overload protector disposed in the fan motor 11, and the overload protector is used to protect the circuit of the variable frequency air conditioner indoor fan.
[0052] Through this technical solution, a variable frequency air conditioner indoor fan 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 air conditioner indoor fan 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 air conditioner indoor fan control system, comprising a variable frequency air conditioner indoor fan control circuit board (1) and a fan motor (11), characterized in that: The variable frequency air conditioner indoor fan control circuit board (1) comprises a PCB board (2) and a variable frequency control circuit arranged on the PCB board (2); the variable frequency control circuit comprises an input end for connecting to a DC power supply, an inverter circuit module (3) and a three-phase current output end for connecting to the fan motor (11); the inverter circuit module (3) comprises a circuit layer (4) integrated with a three-phase bridge inverter circuit and a heat dissipation layer (5) arranged on top of the circuit layer (4).
2. The variable frequency air conditioner indoor fan control system according to claim 1, characterized in that: The three-phase bridge inverter circuit in the circuit layer (4) is provided with a switch tube V1 and a switch tube V4 constituting a first bridge arm, a switch tube V2 and a switch tube V5 constituting a second bridge arm, and a switch tube V3 and a switch tube V6 constituting a third bridge arm; 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 are MOSFET tubes, IGBT tubes, BJT tubes or thyristors.
3. The variable frequency air conditioner indoor fan 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 air conditioner indoor fan control system according to claim 1, characterized in that: A heat-conducting insulating layer (6) is provided between the circuit layer (4) and the heat dissipation layer (5); The heat-conducting insulating layer (6) is used to conduct the heat of the circuit layer (4) to the heat dissipation layer (5).
5. The variable frequency air conditioner indoor fan control system according to claim 4, characterized in that: The thermally conductive insulating layer (6) is a phase-change thermally conductive insulating material, a thermally conductive adhesive tape, a thermally conductive insulating elastic rubber, a thermally conductive filler or a thermally conductive insulating potting glue.
6. The variable frequency air conditioner indoor fan control system according to claim 1, characterized in that: The variable frequency control circuit further comprises a variable frequency drive chip (7) arranged on the PCB board (2), and the variable frequency drive chip (7) is electrically connected to the inverter circuit module (3).
7. The variable frequency air conditioner indoor fan control system according to claim 1, characterized in that: The frequency conversion control circuit further comprises a filter capacitor (8) arranged on the PCB board (2), and the filter capacitor (8) is connected in parallel with the inverter circuit module (3) between the positive electrode and the negative electrode of the input end.
8. The variable frequency air conditioner indoor fan control system according to claim 6, characterized in that: The variable frequency control circuit further comprises a current sampling resistor (12) arranged on the PCB board (2), the current sampling resistor (12) being connected in series between the inverter circuit module (3) and the negative electrode of the input end and being electrically connected to the variable frequency drive chip (7), the current sampling resistor (12) being used to prevent an excessive current from occurring when the circuit is operating, thereby protecting the safety of the variable frequency control circuit.
9. The variable frequency air conditioner indoor fan control system according to claim 6, characterized in that: The fan motor (11) comprises fan blades, a drive motor and a sensor; the fan blades, the drive motor and the sensor are electrically connected to each other; the sensor is electrically connected to the variable frequency drive chip (7) and is used to detect working parameters of the drive motor and feed them back to the variable frequency drive chip (7).
10. A variable frequency air conditioner indoor fan, characterized in that: The invention comprises a variable frequency air conditioner indoor fan control system as claimed in any one of claims 1 to 9, a power supply (9) and a rectifier (10), wherein the rectifier (10) is electrically connected to the power supply (9) and the variable frequency air conditioner indoor fan control system respectively; and the rectifier (10) is used to convert the alternating current input by the power supply (9) into direct current.