Control circuit of fan motor and fan

Abstract

The utility model relates to a fan motor control circuit and a fan, and relates to the technical field of motor control, the fan motor control circuit comprises a charging management module, a motor driving module and a main control module; the output end of the charging management module is connected with the input end of the motor driving module and the input end of the main control module; the main control module comprises a main control chip, the main control chip comprises a motor boost output pin and a motor enable signal output pin, and the main control chip is connected with the motor driving module through the motor boost output pin and the motor enable signal output pin; and an overvoltage detection signal output pin and an overcurrent detection signal output pin, wherein the main control chip is connected with the motor driving module through the overvoltage detection signal output pin and the overcurrent detection signal output pin. The motor over-voltage and over-current detection circuit has the effects of providing boost control for the motor and detecting over-voltage and over-current of the motor at the same time, and ensuring safe operation of the motor.

Description

Technical Field

[0001] The present application relates to the field of motor control, and in particular to a control circuit of a fan motor and a fan. Background Art

[0002] At present, common household appliances, such as fans, require high-speed motors to drive them. Since the motor has a high voltage requirement when running, a PWM control signal with a boost output frequency of 125kHz is usually used to drive the motor. At the same time, when the motor is connected to a charging device such as USB, its higher supply voltage may cause the boost output voltage to be too high. However, excessive boost may cause the voltage or current to be too high, which may burn out the circuit board, thereby affecting the normal operation of the motor and may also cause safety accidents. Utility Model Content

[0003] The purpose of the present application is to provide a control circuit for a fan motor, which can detect overvoltage and overcurrent of the motor while providing boost control to the motor.

[0004] In a first aspect, a control circuit of a fan motor provided by the present application adopts the following technical solution:

[0005] A control circuit for a fan motor comprises a charging management module, a motor drive module and a main control module;

[0006] The output end of the charging management module is respectively connected to the input end of the motor drive module and the input end of the main control module;

[0007] The main control module includes a main control chip, the main control chip includes a motor boost output pin and a motor enable signal output pin, and the main control chip is connected to the input end of the motor drive module through the motor boost output pin and the motor enable signal output pin respectively;

[0008] The main control chip comprises an overvoltage detection signal output pin and an overcurrent detection signal output pin, and the main control chip is connected to the input end of the motor drive module through the overvoltage detection signal output pin and the overcurrent detection signal output pin respectively.

[0009] By adopting the above-mentioned technical scheme, the main control chip of the present application is connected to the motor drive module through the motor boost output pin and the motor enable signal output pin, and provides the motor drive module with a high-voltage control signal sufficient to drive the motor to operate. At the same time, the motor drive module is connected through the overvoltage detection signal output pin and the overcurrent detection signal output pin to detect whether the motor drive module is overvoltage or overcurrent. When the main control chip detects that the motor drive module is overvoltage or overcurrent, the motor boost output pin is disconnected to disable the motor drive module, thereby reducing the probability of safety accidents causing circuit boards to burn out due to excessive voltage or current.

[0010] Further, the motor drive module includes a motor boost input circuit and a motor enable signal input circuit, the motor boost input circuit is connected to the motor boost output pin, and the motor enable signal input circuit is connected to the motor enable signal output pin;

[0011] The motor drive module also includes an overvoltage detection circuit connected in parallel with the motor boost input circuit, and an overcurrent detection circuit connected in series with the motor enable signal input circuit;

[0012] The overvoltage detection circuit is connected to the overvoltage detection signal output pin, and the overcurrent detection circuit is connected to the overcurrent detection signal pin.

[0013] By adopting the above-mentioned technical solution, the present application connects an overvoltage detection circuit in parallel with the motor boost input circuit, and the overvoltage detection circuit is used to connect the overvoltage detection signal output pin, so as to detect whether the voltage of the motor boost input circuit is too high; and connects an overcurrent detection circuit in series with the motor enable signal input circuit, and the overcurrent detection circuit is used to connect the overcurrent detection signal output pin, so as to detect whether the current of the motor drive module is too high, so as to ensure the normal operation of the motor.

[0014] Further, the overvoltage detection circuit includes a first resistor and a second resistor;

[0015] The first resistor and the second resistor are connected in series, the overvoltage detection signal output pin is connected to the connection point between the first resistor and the second resistor, and the output end of the second resistor is grounded.

[0016] By adopting the above technical solution, the present application realizes voltage division by connecting the first resistor and the second resistor in series to protect the overvoltage detection signal output pin and ensure the reliability of overvoltage detection.

[0017] Further, the overcurrent detection circuit includes a third resistor and a fourth resistor;

[0018] The input end of the third resistor is connected to the overcurrent detection signal output pin, the output end of the third resistor is connected to the input end of the fourth resistor, and the output end of the fourth resistor is grounded.

[0019] By adopting the above technical solution, the present application realizes current diversion through the third resistor and the fourth resistor connected in parallel to protect the overcurrent detection signal output pin and ensure the reliability of overcurrent detection.

[0020] Further, the charging management module includes a charging management chip, and the charging management chip includes a charging signal output pin;

[0021] The main control chip includes a charging signal input pin;

[0022] The charging signal output pin of the charging management chip is connected to the charging signal input pin of the main control chip.

[0023] By adopting the above technical solution, the present application sets a charging management module so that the motor controlled by the control circuit can operate without an external power supply, which is more suitable for portable fans. The charging management chip of the present application sends an electrical signal to the electrical signal input pin of the main control chip through the electrical signal output pin. The electrical signal contains information on whether the charging management chip is fully charged, so that the main control module can obtain the fully charged information and process it.

[0024] Furthermore, the charging management module also includes a charging status detection circuit;

[0025] The main control chip also includes a charging status signal input terminal;

[0026] The charging state detection circuit is connected to the charging state signal input terminal.

[0027] By adopting the above technical solution, the charging status detection circuit of the present application is used to detect whether there is currently charging access, and the information on whether there is charging access is sent to the main control chip for processing through the charging status signal. The main control chip determines the current charging status through the information on whether the charging is full and whether there is charging access. The charging status includes not charging, charging and fully charged, thereby ensuring that the main control module can obtain the operating status of the charging management module.

[0028] Furthermore, the main control chip also includes at least two charging status indicator light pins;

[0029] The main control chip is connected to the charging status indicator light through at least two of the charging status indicator light pins.

[0030] By adopting the above technical solution, the main control chip of the present application is connected to the charging status indicator light through at least two of the charging status indicator light pins to display the current charging status, thereby ensuring that the user can quickly know whether it is currently charging and whether it is fully charged through the charging status indicator light.

[0031] Furthermore, the main control chip also includes a motor gear position button pin, and the main control chip is connected to the motor gear position button via the motor gear position button pin.

[0032] By adopting the above technical solution, the motor can be controlled to switch to different operating gears through the motor gear button. The motor gear button is connected through the motor gear button pin, so that the motor drive module is controlled through the main control chip, thereby controlling the different operating gears of the motor.

[0033] Furthermore, the main control chip also includes at least three motor gear position indicator light pins;

[0034] The main control chip is connected to at least three motor gear position indicator lights through at least three motor gear position indicator light pins.

[0035] By adopting the above technical solution, when the motor has at least three operating gears, at least three motor gear indicator lights are set to display the current operating gear of the motor, so as to ensure that the user can quickly know the current operating gear of the motor through the motor gear indicator lights, thereby facilitating the adjustment of the motor gear.

[0036] Furthermore, it also includes a lighting device driving module, the main control chip includes a lighting device output pin, and the main control chip is connected to the lighting device driving module via the lighting device output pin.

[0037] By adopting the above technical solution, the control circuit of the present application can not only drive the motor to operate, but also drive the lighting device at the same time, so that the control circuit of the present application can be suitable for fans with lighting functions.

[0038] In a second aspect, a fan is provided, comprising a fan body and a control circuit of a fan motor as described in the first aspect;

[0039] The fan body includes a fan motor, the control circuit is built in the fan body, and the control circuit is used to control the fan motor;

[0040] It also includes a charging status indicator light, a motor gear position button and at least three motor gear position indicator lights arranged outside the fan body;

[0041] The charging status indicator light, the motor gear position button and at least three motor gear position indicator lights are respectively connected to the main control chip.

[0042] The control circuit provided by the first aspect controls the fan motor drive, and detects motor overvoltage and overcurrent, thereby ensuring the normal operation of the fan motor and reducing possible safety accidents during use; the current charging status is displayed by the charging status indicator light, the motor operating gear is controlled by the motor gear button, and the current operating gear of the motor is displayed by at least three motor gear indicator lights, making the fan of the present application more convenient to use.

[0043] In summary, the present application includes at least one of the following beneficial technical effects:

[0044] 1. This application connects the motor drive module through the overvoltage detection signal output pin and the overcurrent detection signal output pin to detect whether the motor drive module is overvoltage or overcurrent, so as to ensure that the motor can operate normally and reduce the probability of safety accidents that burn out the circuit board due to excessive voltage or current;

[0045] 2. The present application realizes voltage division by connecting a first resistor and a second resistor in series to protect the overvoltage detection signal output pin and ensure the reliability of overvoltage detection;

[0046] 3. The present application realizes current shunting by connecting the third resistor and the fourth resistor in parallel to protect the overcurrent detection signal output pin and ensure the reliability of overcurrent detection;

[0047] 4. The main control module of the present application includes at least two charging status indicator lights for displaying the current charging status, so that the user can quickly know whether the current charging is in progress and whether the battery is fully charged through the charging status indicator lights;

[0048] 5. This application uses a motor gear indicator light to display the current operating gear of the motor, so as to ensure that the user can quickly know the current operating gear of the motor through the motor gear indicator light, thereby facilitating the adjustment of the motor gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is an overall circuit structure diagram of an embodiment of the present application;

[0050] Figure 2 is a circuit structure diagram of a main control module in an embodiment of the present application;

[0051] Figure 3 is a circuit structure diagram of a motor drive module according to an embodiment of the present application;

[0052] Figure 4 is a circuit structure diagram of a lighting device driving module according to an embodiment of the present application;

[0053] Figure 5 is a circuit structure diagram of a charging management module in an embodiment of the present application;

[0054] Figure 6 is a bottom view of the overall structure of the fan of the embodiment of the present application;

[0055] Figure 7 is a top view of the overall structure of the fan of an embodiment of the present application;

[0056] In the figure, 1. main control module; 2. motor drive module; 21. motor boost input circuit; 22. motor enable signal input circuit; 23. overvoltage detection circuit; 24. overcurrent detection circuit; 3. lighting device drive module; 4. charging management module; 41. charging status detection circuit; 5. fan body; 6. LED light; 7. charging interface; 8. charging status indicator light; 9. motor gear button; 10 motor gear indicator light; 11. lighting switch button. DETAILED DESCRIPTION

[0057] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0058] The present application embodiment provides a control circuit of a fan motor. Figure 1 , including a main control module 1, a charging management module 4 and a motor drive module 2. The output end of the main control module 1 is connected to the input end of the motor drive module 2, and is used to control the motor drive module 2. The output end of the charging management module 4 is connected to the input end of the motor drive module 2 and the input end of the main control module 1, and the input end of the charging management module 4 is connected to a charging device for charging the charging management module 4, so that the charging management module 4 can supply power to the motor drive module 2 and the main control module 1, so that the motor can operate normally without being connected to an external power supply.

[0059] This embodiment further includes a lighting device driving module 3. The output end of the main control module 1 is connected to the input end of the lighting device driving module 3 for controlling the lighting device driving module 3 so that this embodiment can drive the lighting device while driving the motor.

[0060] like Figure 2 As shown, the main control module 1 includes a main control chip U1. The main control chip U1 adopts a single-chip microcomputer with a chip model of NY8B062F, which includes a total of 16 pins, of which pin 1 is a power supply pin, pin 2 is a charging signal input pin, pin 3 is a lighting switch button pin, pin 4 is a motor gear button pin, pin 5 is a motor boost output pin, pin 6 is a lighting device output pin, pins 7 and 9 are charging status indicator pins, pin 8 is a motor enable signal output pin, pins 10-12 are motor gear indicator pins, pin 13 is a charging status signal input pin, pin 14 is an overvoltage detection signal output pin, pin 15 is an overcurrent detection signal output pin, and pin 16 is a ground pin.

[0061] The main control chip U1 is connected to the motor boost input circuit 21 of the motor drive module 2 through the motor boost output pin to output the MOS_EN1 signal to the motor boost input circuit 21, which is used to provide the motor drive module 2 with a boosted voltage input to ensure that the motor can run. In the specific implementation process, the motor boost output pin outputs a 125kHz PWM signal. When the charging device is connected, it is powered by an external power supply. When the external power supply is powered, the main control chip U1 can reduce the duty cycle of the motor boost PWM signal to prevent the higher power supply voltage of the charging device from causing the boost output voltage to be too high. When the charging device is disconnected, the charging management module 4 powers the circuit.

[0062] The main control chip U1 is connected to the motor enable signal input circuit 22 of the motor drive module 2 through the motor enable signal output pin to output the MOS_EN2 signal to the motor enable signal input circuit 22 for providing an enable signal to the motor drive module 2 for controlling the switch of the motor drive module 2.

[0063] like Figure 3 As shown, the motor drive module 2 includes a motor boost input circuit 21, a motor enable signal input circuit 22, an overvoltage detection circuit 23 and an overcurrent detection circuit 24. The motor boost input circuit 21 is connected to the input terminal 1 of the motor, and the motor enable signal input circuit 22 is connected to the input terminal 2 of the motor, for driving the motor to run. The motor boost input circuit 21 includes an N-MOS tube Q6. In the specific implementation process, an N-MOS tube of model AO3400 is used. The MOS_EN1 signal is input to the gate of the N-MOS tube Q6, so that the N-MOS tube Q6 is used to switch on the motor boost input circuit 21, the source of the N-MOS tube Q6 is grounded, and the drain of the N-MOS tube Q6 is connected to the motor input terminal, so as to drive the motor when the N-MOS tube Q6 is turned on. The motor boost input circuit 21 is also provided with a resistor R26 and a resistor R28, and the resistor R26 and the resistor R28 are connected in parallel to protect the motor boost output pin. The motor enable signal input circuit 22 includes an N-MOS tube Q5. In the specific implementation process, an N-MOS tube of model AO3400 is used. The MOS_EN2 signal is input to the gate of the N-MOS tube Q5, so that the N-MOS tube Q5 is used to switch on the motor enable signal input circuit 22. The source of the N-MOS tube Q5 is connected to the overcurrent detection circuit 24, and the drain of the N-MOS tube Q5 is connected to the motor input terminal, so as to drive the motor when the N-MOS tube Q5 is turned on. The motor enable signal input circuit 22 is also provided with resistors R24 and R25 for protecting the motor enable signal output pin.

[0064] like Figure 1 and Figure 3 As shown, the main control chip U1 is connected to the overvoltage detection circuit 23 of the motor drive module 2 through the overvoltage detection signal output pin and outputs an OVP signal to the overvoltage detection circuit 23, which is used to detect the voltage of the motor drive module 2. In the specific implementation process, since the voltage detection needs to be connected in parallel with the circuit to be detected, the overvoltage detection circuit 23 is connected in parallel with the motor boost input circuit 21. Specifically, the overvoltage detection circuit 23 includes an overvoltage detection signal OVP input terminal, a resistor R24 ​​and a resistor R31, the resistor R24 ​​and the resistor R31 are connected in series, the overvoltage detection signal OVP input terminal is connected to the connection between the resistor R24 ​​and the resistor R31, and the resistor R24 ​​and the resistor R31 are used for voltage division, thereby protecting the overvoltage detection signal output pin.

[0065] The main control chip U1 is connected to the overcurrent detection circuit 24 of the motor drive module 2 through the overcurrent detection signal output pin, and outputs the AD_IO signal to the overcurrent detection circuit 24, which is used to detect the overcurrent of the current of the motor drive module 2. In the specific implementation process, since the current detection needs to be connected in series with the current to be detected, the overcurrent detection circuit 24 is connected in series with the motor enable signal input circuit 22. Specifically, the overcurrent detection circuit 24 includes an overcurrent detection signal AD_IO input terminal, a resistor R30 and a resistor R32, one end of the resistor R32 is connected to the source level of the N-MOS tube Q5 in the motor enable signal input circuit 22, the resistor R30 and the resistor R32 are connected in parallel, the overcurrent detection signal AD_IO input terminal is connected to one end of the resistor R30, and the resistor R30 and the resistor R32 are used for shunting, thereby protecting the overcurrent detection signal output pin.

[0066] In the specific implementation process, when the main control chip U1 detects that the motor drive module 2 is over-voltage or over-current, the motor boost output pin is disconnected to disable the motor drive module 2, thereby powering off the motor. In another embodiment, when the main control chip U1 detects that the motor drive module 2 is over-voltage or over-current, a warning light or alarm can be used to remind the control circuit to be powered off or repaired in time, thereby avoiding safety accidents caused by over-voltage or over-current of the control circuit.

[0067] like Figure 1 and Figure 4 As shown, the main control chip U1 is connected to the lighting device driver module 3 through the lighting device output pin, and outputs a MOS_EN3 signal to the lighting device driver module 3, which is used to drive the lighting device. The lighting device driver module 3 includes an N-MOS tube Q7. In the specific implementation process, an N-MOS tube of model AO3400 is used. The MOS_EN3 signal is input to the gate of the N-MOS tube Q7, so that the N-MOS tube Q7 is used to switch on the lighting device driver module 3. The source of the N-MOS tube Q7 is grounded, and the drain of the N-MOS tube Q7 is connected to the input end of the light-emitting diode D7, so that the lighting device is driven when the N-MOS tube Q7 is turned on. Resistors R27 and R29 are also provided, and the resistors R27 and R29 are used to protect the motor boost output pin. In the specific implementation process, the lighting device uses an LED lamp 6, and the output pin of the lighting device outputs a PWM dimming signal to drive the lighting device. When the voltage of the output PWM dimming signal is too low, the output pin of the lighting device is disabled for output.

[0068] like Figure 5As shown, the charging management module 4 of this embodiment includes a charging management chip U2. In the specific implementation, the charging management chip U2 adopts a TC4056A lithium battery chip for charging and power supply. Pin 8 of the charging management chip U3 is a charging enable pin, which enables the charging management module 4. Pin 4 of the charging management chip U2 is a power input pin. When a charging device is connected, the charging enable pin transmits an enable signal, and the charging device charges the charging management chip U2 through the power input pin; Pin 5 of the charging management chip U3 is a battery output pin, which is used to power the motor drive module 2 and the lighting device drive module 3.

[0069] Pin 7 of the charging management chip U2 is the charging signal output pin, which is connected to the charging signal input pin of the main control chip and outputs the CHGR signal for transmitting the charging signal. The charging signal contains information about whether the charging management chip U2 is fully charged. The main control chip U1 also detects the power level through the charging signal, and gives a prompt and performs low-voltage protection when the power level is low. During the low-voltage protection, the motor boost output and lighting device output are disabled, and the motor drive module 2 and lighting device drive module 3 enter sleep mode to ensure that the charging power module operates at low power consumption and prevent over-discharge of the lithium battery.

[0070] The charging management module 4 also includes a charging status detection circuit 41, which is connected in parallel with the charging device access terminal to detect whether there is a charging device currently connected. In the specific implementation, the charging device access terminal is the Type-C charging port P1, and the charging status detection circuit 41 is connected to the charging status signal input pin, and outputs the charging status VIN_DET signal to the charging status signal input pin. The charging status signal contains information on whether charging is currently in progress. The charging status detection circuit 41 includes a charging status signal output terminal, a resistor R21 and a resistor R22, and the resistor R21 and the resistor R22 are connected in series. The charging status signal output terminal is connected to the connection between the resistor R21 and the resistor R22, and the resistor R21 and the resistor R22 are connected in series to divide the voltage to protect the charging status signal input pin.

[0071] The main control chip U1 determines whether the current charging management chip U2 is charging and whether it is fully charged by receiving the charging status signal and the charging signal, and divides the charging status of the charging management module 4 into uncharged, charging and fully charged, and then displays the current charging status of the charging management module 4 through the pin of the charging status indicator 8. In the specific implementation process, a charging status indicator 8 is set, and the charging status indicator 8 can light up red and green. When the charging status of the charging management module 4 is uncharged, the charging status indicator 8 is off; when the charging status of the charging management module 4 is charging, the charging status indicator 8 lights up red; when the charging status of the charging management module 4 is fully charged, the charging status indicator 8 lights up green. The current charging status of the charging management module 4 is clearly displayed, which is convenient for users to charge or stop charging.

[0072] The main control chip U1 is connected to the motor gear button 9 through the motor gear button 9 pin, so as to control the running gear of the motor through the motor gear button 9. In the specific implementation, the motor gear is divided into three gears: large, medium and small. Pressing the motor gear button 9 once switches to the small gear, pressing it twice switches to the medium gear, and pressing it three times switches to the large gear, which is more convenient for adjusting the motor gear.

[0073] The main control chip U1 is connected to three motor gear indicator lights 10 through three motor gear indicator pins. The motor gear indicator lights 10 are used to display the current motor running gear. In specific implementation, when the motor running gear is a small gear, only one of the three motor gear indicator lights 10 is on; when the motor running gear is a medium gear, two of the three motor gear indicator lights 10 are on; when the motor running gear is a large gear, all three motor gear indicator lights 10 are on. This can clearly display the current driving state of the motor drive module 2, so as to know the running gear of the motor, which is convenient for the user to adjust the motor gear.

[0074] The implementation principle of the present application is as follows: the main control chip U1 of the main control module 1 is connected to the motor boost input circuit 21 and the motor enable signal input circuit 22 of the motor drive module 2 through the motor boost output pin and the motor enable signal output pin, and provides the motor drive module 2 with a high voltage control signal sufficient to drive the motor to run. At the same time, the main control chip U1 is connected to the overvoltage detection circuit 23 and the overcurrent detection circuit 24 of the motor drive module 2 through the overvoltage detection signal output pin and the overcurrent detection signal output pin, which are used to detect whether the motor drive module 2 has overvoltage or overcurrent, thereby reducing the probability of safety accidents causing circuit boards to burn out due to excessive voltage or current.

[0075] like Figure 6As shown, this embodiment further provides a fan, including a fan body 5 and a lighting device installed on the fan body 5. The lighting device of this embodiment uses an LED lamp 6. The fan body 5 includes a fan motor, and the fan motor and the LED lamp 6 are driven by the control circuit in the above scheme.

[0076] like Figure 7 As shown, the fan also includes a charging interface 7, a charging status indicator light 8, a motor gear button 9, three motor gear indicator lights 10 and a lighting switch button 11 arranged outside the fan body 5. The charging interface 7 is electrically connected to the charging management chip U2 through the power input pin for connecting to the charging device. The charging status indicator light 8 is electrically connected to the main control chip through the charging status indicator light pin to display the current charging status. In the specific implementation process, when the charging status is not charged, that is, there is no charging device connected at present, the charging status indicator light 8 is not lit; when the charging status is charging, that is, there is a charging device connected and the charge is not full, the charging status indicator light 8 is red; when the charging status is full, that is, there is a charging device connected and the charge is full, the charging status indicator light 8 is green.

[0077] The motor gear button 9 is electrically connected to the main control chip through the motor gear button pin, and is used to adjust the operating gear of the fan motor. The gears are divided into three: large, medium and small. In the specific implementation process, when the fan is in the off state, pressing the motor gear button 9 once starts the fan, and the current gear is the small gear; pressing it again switches the current gear to the medium gear; pressing it again switches the current gear to the large gear; pressing it again turns off the fan motor.

[0078] The three motor gear indicator lights 10 are electrically connected to the main control chip through the three motor gear indicator light pins, and are used to display the current operating gear of the fan motor. When the current gear is a low gear, the No. 1 motor gear indicator light is on; when the current gear is a medium gear, the No. 1 motor gear indicator light and the No. 2 motor gear indicator light are on; when the current gear is a high gear, the No. 1 motor gear indicator light, the No. 2 motor gear indicator light and the No. 3 motor gear indicator light are on.

[0079] The lighting switch button 11 is connected to the main control chip U1 through the lighting switch button pin, and is used to control the switch of the LED lamp 6. When the LED lamp 6 is in the off state, pressing the lighting switch button 11 once turns on the lighting device; pressing the lighting switch button 11 again turns off the lighting device.

[0080] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control circuit for a fan motor, characterized in that: It comprises a charging management module (4), a motor drive module (2) and a main control module (1); The output end of the charging management module (4) is respectively connected to the input end of the motor drive module (2) and the input end of the main control module (1); The main control module (1) comprises a main control chip, the main control chip comprises a motor boost output pin and a motor enable signal output pin, and the main control chip is connected to the input end of the motor drive module (2) via the motor boost output pin and the motor enable signal output pin respectively; The main control chip comprises an overvoltage detection signal output pin and an overcurrent detection signal output pin, and the main control chip is connected to the input end of the motor drive module (2) via the overvoltage detection signal output pin and the overcurrent detection signal output pin respectively.

2. A fan motor control circuit according to claim 1, characterized in that: The motor drive module (2) comprises a motor boost input circuit (21) and a motor enable signal input circuit (22), wherein the motor boost input circuit (21) is connected to a motor boost output pin, and the motor enable signal input circuit (22) is connected to a motor enable signal output pin; The motor drive module (2) further comprises an overvoltage detection circuit (23) connected in parallel with the motor boost input circuit (21), and an overcurrent detection circuit (24) connected in series with the motor enable signal input circuit (22); The overvoltage detection circuit (23) is connected to the overvoltage detection signal output pin, and the overcurrent detection circuit (24) is connected to the overcurrent detection signal pin.

3. A fan motor control circuit according to claim 2, characterized in that: The overvoltage detection circuit (23) comprises a first resistor and a second resistor; The first resistor and the second resistor are connected in series, the overvoltage detection signal output pin is connected to the connection between the first resistor and the second resistor, and the output end of the second resistor is grounded; And / or, the overcurrent detection circuit (24) includes a third resistor and a fourth resistor; The input end of the third resistor is connected to the overcurrent detection signal output pin, the output end of the third resistor is connected to the input end of the fourth resistor, and the output end of the fourth resistor is grounded.

4. A fan motor control circuit according to claim 1, characterized in that: The charging management module (4) comprises a charging management chip, and the charging management chip comprises a charging signal output pin; The main control chip includes a charging signal input pin; The charging signal output pin of the charging management chip is connected to the charging signal input pin of the main control chip.

5. A fan motor control circuit according to claim 4, characterized in that: The charging management module (4) further comprises a charging state detection circuit (41); The main control chip also includes a charging status signal input pin; The charging state detection circuit (41) is connected to the charging state signal input pin.

6. A fan motor control circuit according to claim 5, characterized in that: The main control chip also includes at least two charging status indicator light pins; The main control chip is connected to the charging status indicator light (8) via at least two of the charging status indicator light pins.

7. A fan motor control circuit according to claim 1, characterized in that: The main control chip also includes a motor gear position button pin, and the main control chip is connected to the motor gear position button (9) via the motor gear position button pin.

8. A fan motor control circuit according to claim 7, characterized in that: The main control chip also includes at least three motor gear indicator light pins; The main control chip is connected to at least three motor gear position indicator lights (10) respectively via at least three motor gear position indicator light pins.

9. A fan motor control circuit according to any one of claims 1 to 8, characterized in that: It also includes a lighting device driving module (3), the main control chip includes a lighting device output pin, and the main control chip is connected to the lighting device driving module (3) via the lighting device output pin.

10. A fan, characterized in that: It comprises a fan body (5) and a control circuit of a fan motor as claimed in any one of claims 1 to 9; The fan body comprises a fan motor, the control circuit is built into the fan body (5), and the control circuit is connected to the fan motor; It also includes a charging status indicator light (8), a motor gear position button (9) and at least three motor gear position indicator lights (10) arranged outside the fan body (5); The charging status indicator light (8), the motor gear position button (9) and at least three motor gear position indicator lights (10) are respectively connected to the main control chip.

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