Direct-current variable-frequency fan adjusting system integrating wall control, pulling speed control and remote control

Abstract

The utility model discloses a direct current frequency conversion fan adjusting system integrating wall control, pulling speed and remote control, which comprises a wall control input circuit, a pulling speed control input circuit, a remote control input circuit and a motor control circuit, and the wall control input circuit is connected with a power supply on-off detection circuit and a wall control signal level detection circuit. The system further comprises a controller which is respectively connected with the power supply on-off detection circuit, the wall control signal level detection circuit, the pulling speed control input circuit, the remote control input circuit and the motor control circuit and is used for reading a wall control level signal of the wall control signal level detection circuit after the power supply on-off detection circuit detects that the power supply is switched on for a period of time. And the main control circuit controls the motor control circuit to drive the fan motor to work according to the wall control level signal or the pulling speed control signal or the remote control signal, so that the problem of control failure caused by the fact that the wall control input circuit is continuously touched for multiple times is solved.

Description

[Technical field]

[0001] The utility model relates to a DC variable frequency fan regulating system integrating wall control, pulling speed and remote control. [Background Technology]

[0002] In the existing fan adjustment system integrating multiple control functions, the AC wall controller is easily triggered by continuous multiple touches, which easily leads to the problem of control confusion of the fan adjustment system, resulting in the fan working state not corresponding to the user control input state or even control failure. [Contents of the utility model]

[0003] The utility model overcomes the shortcomings of the prior art and provides a DC variable frequency fan adjustment system integrating wall control, speed control and remote control.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control, characterized in that it includes a wall control input circuit connected to the mains for inputting wall control signals, a speed control input circuit for inputting speed control signals, a remote control input circuit for receiving remote control control signals and a motor control circuit for driving a fan motor to work, the wall control input circuit is connected to a power on / off detection circuit for detecting the power on / off state and a wall control signal level detection circuit for detecting the level of the wall control control signal, the system also includes a main control circuit respectively connected to the power on / off detection circuit, the wall control signal level detection circuit, the speed control input circuit, the remote control input circuit and the motor control circuit, for reading the wall control level signal of the wall control signal level detection circuit after the power on / off detection circuit detects that the power is on for a period of time, and controlling the motor control circuit to drive the fan motor to work according to the wall control level signal or the speed control signal or the remote control signal.

[0006] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the wall control input circuit is connected to a system power supply circuit for converting AC power into DC power and supplying power to a power on / off detection circuit, a wall control signal level detection circuit, a remote control input circuit and a motor control circuit respectively; the system power supply circuit is connected to an MCU power supply circuit for supplying power to a main control circuit.

[0007] As described above, a DC variable frequency fan adjustment system integrating wall control, speed control and remote control is characterized in that: the main control circuit is connected to a voltage detection circuit for detecting the power supply voltage of the MCU power supply circuit for overvoltage protection, and an overcurrent comparison circuit for collecting the current of the motor control circuit and comparing it for overcurrent protection.

[0008] The DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the main control circuit is connected to a buzzer circuit for sound feedback of the working status, and the system power supply circuit supplies power to the buzzer circuit.

[0009] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the wall control input circuit includes a switch SW1, one end of the switch SW1 is connected to the live wire of the AC power, the other end of the switch SW1 is respectively connected to the positive end of the diode D2 and the negative end of the diode D1, the negative end of the diode D2 is connected to one end of the switch POWE, the positive end of the diode D1 is connected to the switch OP, one end of the capacitor C1 is connected to the neutral wire of the AC power, and the other end of the capacitor C1 is respectively connected to the other end of the switch OP, the other end of the switch POWE, the power on / off detection circuit, the wall control signal level detection circuit, and the system power supply circuit.

[0010] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the power on-off detection circuit includes a photocoupler U12, pin 1 of the photocoupler U12 is connected to the AC neutral line, pin 2 of the photocoupler U12 is connected to the wall control input circuit, pin 3 of the photocoupler U12 is respectively connected to one end of the resistor R94 and the main control circuit, the other end of the resistor R94 is grounded, and pin 4 of the photocoupler U12 is connected to the 5V power supply through the resistor R95.

[0011] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the wall control signal level detection circuit includes a photocoupler U11, the pin 1 of the photocoupler U11 is respectively connected to one end of the bidirectional breakdown diode D6 and the AC neutral line, the pin 2 of the photocoupler U11 is respectively connected to the other end of the bidirectional breakdown diode D6 and one end of the resistor R57, the other end of the resistor R57 is connected to the wall control input circuit, the pin 3 of the photocoupler U11 is grounded, the pin 4 of the photocoupler U11 is respectively connected to one end of the capacitor C53, one end of the resistor R64, and one end of the resistor R65, the other end of the capacitor C53 is grounded, the other end of the resistor R64 is connected to the main control circuit, and the other end of the resistor R65 is connected to a 5V power supply.

[0012] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the speed control input circuit includes a connection terminal J2 connected to a pull-cord switch for forward and reverse direction change and a connection terminal J4 connected to a pull-cord speed regulator for speed regulation, the connection terminal J2 pin 1 is grounded, the connection terminal J2 pin 2 is respectively connected to the main control circuit and one end of the resistor R26, and the other end of the resistor R26 is connected to a 5V power supply; the connection terminal J4 pin 1 is grounded, the connection terminal J4 pin 2 is respectively connected to the main control circuit and one end of the resistor R54, and the other end of the resistor R54 is connected to a 5V power supply.

[0013] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the remote control input circuit includes a remote control receiving chip U10, the pin 1 of the remote control receiving chip U10 is grounded, the pin 2 of the remote control receiving chip U10 is respectively connected to one end of the capacitor C45 and one end of the inductor L5, the other end of the inductor L5 is grounded, the other end of the capacitor C45 is respectively connected to one end of the capacitor C43, the antenna ANT, and one end of the inductor L4, the other end of the capacitor C43 and the other end of the inductor L4 are respectively grounded, the pin 4 of the remote control receiving chip U10 is respectively connected to one end of the capacitor C41 and a 5V power supply, the other end of the capacitor C41 is grounded, the pin 4 of the remote control receiving chip U10 is grounded through the capacitor C42, the pin 5 of the remote control receiving chip U10 is connected to the main control circuit through the resistor R35, the pin 6 of the remote control receiving chip U10 is grounded, the pin 8 of the remote control receiving chip U10 is connected to the pin 3 of the crystal oscillator X1, and the pins 1-2 and pin 3 of the crystal oscillator X1 are grounded respectively.

[0014] A DC variable frequency fan adjustment system integrating wall control, speed control and remote control as described above is characterized in that: the voltage detection circuit includes a resistor R25, one end of the resistor R25 is respectively connected to one end of the capacitor C9 and the main control circuit, the other end of the capacitor C9 is grounded, the other end of the resistor R25 is respectively connected to one end of the resistor R24 ​​and one end of the resistor R28, the other end of the resistor R24 ​​is connected to the MCU power supply circuit, and the other end of the resistor R28 is grounded; the overcurrent comparison circuit includes a capacitor C29, one end of the capacitor C29 is respectively connected to the main control circuit and one end of the resistor R52, the other end of the resistor R52 is grounded, the other end of the capacitor C29 is respectively connected to the main control circuit and one end of the resistor R53, and the other end of the resistor R53 is connected to the motor control circuit.

[0015] The beneficial effects of the utility model are:

[0016] The utility model is provided with a power on-off detection circuit connected to the wall control input circuit for detecting the power on-off state of the wall control input circuit and a wall control signal level detection circuit for detecting the level of the wall control control signal. The main control circuit reads the wall control level signal of the wall control signal level detection circuit only after the power on-off detection circuit detects that the power of the wall control input circuit is connected for a period of time, and controls the motor control circuit to drive the fan motor to perform work according to the wall control level signal, thereby solving the problem of control failure caused by continuous multiple touches of the wall control input circuit, and at the same time plays a role in filtering the signal interference problem of unstable power grid, and can make the fan work more stably during operation; on the other hand, the system is also provided with a speed control input circuit and a remote control input circuit, and can realize fan control through different control methods, and the system drives the fan motor through a DC low voltage, which greatly improves the safety of use. [Drawings]

[0017] Figure 1This is the principle diagram of the utility model;

[0018] Figure 2 This is the wall control input circuit diagram of the utility model;

[0019] Figure 3 This is a partial circuit diagram of the utility model. [Specific implementation method]

[0020] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0021] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present utility model are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0022] like Figure 1 As shown, a DC variable frequency fan regulation system integrating wall control, speed control and remote control includes a wall control input circuit 1 connected to the mains for inputting wall control signals, a speed control input circuit 2 for inputting speed control signals, a remote control input circuit 3 for receiving remote control control signals and a motor control circuit 4 for driving the fan motor to work, the wall control input circuit 1 is connected to a power on / off detection circuit 5 for detecting the power on / off state and a wall control signal level detection circuit 6 for detecting the level of the wall control control signal, the system also includes a main control circuit 7 respectively connected to the power on / off detection circuit 5, the wall control signal level detection circuit 6, the speed control input circuit 2, the remote control input circuit 3 and the motor control circuit 4, for reading the wall control level signal of the wall control signal level detection circuit 6 after the power on / off detection circuit 5 detects that the power is on for a period of time, and controlling the motor control circuit 4 to drive the fan motor to work according to the wall control level signal or the speed control signal or the remote control signal.

[0023] In actual use, the user can input control signals to the DC variable frequency fan adjustment system through the wall control input circuit 1, the speed control input circuit 2 or the remote control input circuit 3, and realize the function of controlling the fan in multiple control modes; after the control signal is input to the wall control input circuit 1, the power on / off detection circuit 5 detects the power on / off state of the wall control input circuit 1, and the main control circuit 7 reads the wall control level signal input by the wall control input circuit 1 through the wall control signal level detection circuit 6 after the power on / off detection circuit 5 detects that the power is on for a period of time, and controls the motor control circuit 4 to drive the fan motor to work through the wall control level signal. The control signal input by the wall control input circuit 1 is filtered by the power on / off detection circuit 5 for multiple consecutive false triggering, which solves the problem of the control failure of the adjustment system caused by the continuous multiple touches of the wall control input circuit, and at the same time plays a role in filtering the signal interference problem of unstable power grid, and can make the fan work more stably during operation.

[0024] like Figure 1 As shown, the wall control input circuit 1 is connected to a system power supply circuit 8 for converting AC power into DC power and supplying power to the power on / off detection circuit 5, the wall control signal level detection circuit 6, the remote control input circuit 3, and the motor control circuit 4 respectively. The system power supply circuit 8 is connected to an MCU power supply circuit 9 for supplying power to the main control circuit 7. The system power supply circuit 8 converts the AC mains power into low-voltage DC power after rectification, filtering and stepping down, and then supplies power to each circuit.

[0025] like Figure 1 As shown, the main control circuit 7 is connected to a voltage detection circuit 10 for detecting the power supply voltage of the MCU power supply circuit 9 for overvoltage protection, and an overcurrent comparison circuit 11 for collecting the current of the motor control circuit 4 and comparing it for overcurrent protection, thereby realizing the overvoltage and overcurrent protection function of the DC variable frequency fan regulation system; the main control circuit 7 is connected to a buzzer circuit 12 for sound feedback of the working status, and the system power supply circuit 8 supplies power to the buzzer circuit 12, thereby realizing the working status sound feedback prompt function.

[0026] like Figure 2-3 As shown, the wall control input circuit 1 includes a switch SW1, one end of the switch SW1 is connected to the live wire of the mains, the other end of the switch SW1 is respectively connected to the positive end of the diode D2 and the negative end of the diode D1, the negative end of the diode D2 is connected to one end of the switch POWE, the positive end of the diode D1 is connected to the switch OP, one end of the capacitor C1 is connected to the neutral wire of the mains, and the other end of the capacitor C1 is respectively connected to the other end of the switch OP, the other end of the switch POWE, the power on / off detection circuit 5, the wall control signal level detection circuit 6, and the system power supply circuit 8. In actual use, the on / off control of the DC variable frequency fan adjustment system is realized through the switch SW1, and the wall control control signal for speeding up or slowing down the fan is input by cutting the AC mains wave through the switch POWE and the switch OP.

[0027] like Figure 2-3 As shown, the power on / off detection circuit 5 includes a photocoupler U12, the pin 1 of the photocoupler U12 is connected to the neutral line of the mains, the pin 2 of the photocoupler U12 is connected to the wall control input circuit 1, the pin 3 of the photocoupler U12 is respectively connected to one end of the resistor R94 and the main control circuit 7, the other end of the resistor R94 is grounded, and the pin 4 of the photocoupler U12 is connected to the 5V power supply through the resistor R95. In actual use, the wall control input circuit 1 inputs the wall control control signal, and after the pins 1 and 2 of the photocoupler U12 detect the power supply, the photocoupler U12 works and sends a power supply stable detection signal to the control chip U9 of the main control circuit through the pin 3 of the photocoupler U12. The control signal input by the wall control input circuit 1 that is repeatedly triggered by mistake is filtered by the photocoupler U12, which solves the problem of failure of the control system caused by continuous multiple touches of the wall control input circuit, and at the same time plays a role in filtering the signal interference problem of unstable power grid, and can make the fan work more stably during operation.

[0028] like Figure 2-3 As shown, the wall control signal level detection circuit 6 includes a photocoupler U11, and the pin 1 of the photocoupler U11 is respectively connected to one end of the bidirectional breakdown diode D6 and the mains neutral line, the pin 2 of the photocoupler U11 is respectively connected to the other end of the bidirectional breakdown diode D6 and one end of the resistor R57, the other end of the resistor R57 is connected to the wall control input circuit 1, the pin 3 of the photocoupler U11 is grounded, the pin 4 of the photocoupler U11 is respectively connected to one end of the capacitor C53, one end of the resistor R64, and one end of the resistor R65, the other end of the capacitor C53 is grounded, the other end of the resistor R64 is connected to the main control circuit 7, and the other end of the resistor R65 is connected to a 5V power supply. In actual use, after the wall control input circuit 1 inputs the wall control control signal and the power on / off detection circuit 5 sends a detection signal to the main control circuit 7, the photoelectric coupler U11 works and sends a wall control level signal to the control chip U9 of the main control circuit 7 through the photoelectric coupler U11 pin 4. The control chip U9 determines whether the wall control level signal is a fan speed-up control signal or a fan speed-down control signal, thereby controlling the motor control circuit 4 to drive the fan motor to speed up or slow down.

[0029] like Figure 3As shown, the pulling speed control input circuit 2 includes a connection terminal J2 connected to the pull rope switch for forward and reverse direction switching and a connection terminal J4 connected to the pull rope speed regulator for speed regulation. The connection terminal J2 pin 1 is grounded, and the connection terminal J2 pin 2 is respectively connected to the main control circuit 7 and one end of the resistor R26, and the other end of the resistor R26 is connected to a 5V power supply; the connection terminal J4 pin 1 is grounded, and the connection terminal J4 pin 2 is respectively connected to the main control circuit 7 and one end of the resistor R54, and the other end of the resistor R54 is connected to a 5V power supply. In actual use, when the user inputs a speed control signal through the pull-rope speed regulator of the speed control input circuit 2, the connection terminal J2 sends the speed control signal to the main control chip U9 of the main control circuit 7, and the main control chip U9 controls the motor control circuit 4 to drive the fan motor to perform speed control according to the speed control signal; when the user inputs a forward and reverse speed control signal through the pull-rope switch of the speed control input circuit 2, the connection terminal J4 sends a forward and reverse speed control signal to the main control chip U9 of the main control circuit 7, and the main control chip U9 controls the motor control circuit 4 to drive the fan motor to perform forward and reverse direction work according to the forward and reverse speed control signal.

[0030] like Figure 3 As shown, the remote control input circuit 3 includes a remote control receiving chip U10, wherein pin 1 of the remote control receiving chip U10 is grounded, pin 2 of the remote control receiving chip U10 is respectively connected to one end of a capacitor C45 and one end of an inductor L5, the other end of the inductor L5 is grounded, the other end of the capacitor C45 is respectively connected to one end of a capacitor C43, an antenna ANT and one end of an inductor L4, the other end of the capacitor C43 and the other end of the inductor L4 are respectively grounded, pin 4 of the remote control receiving chip U10 is respectively connected to one end of a capacitor C41 and a 5V power supply, the other end of the capacitor C41 is grounded, pin 4 of the remote control receiving chip U10 is grounded through a capacitor C42, pin 5 of the remote control receiving chip U10 is connected to the main control circuit 7 through a resistor R35, pin 6 of the remote control receiving chip U10 is grounded, pin 8 of the remote control receiving chip U10 is connected to pin 3 of a crystal oscillator X1, and pins 1-2 and pin 3 of the crystal oscillator X1 are respectively grounded. In actual use, when the user sends a remote control signal through the remote control, the antenna ANT receives the remote control signal, and sends the remote control signal to the main control chip U9 through the remote control receiving chip U10. The main control chip U9 controls the motor control circuit 4 to drive the fan motor to work according to the remote control signal.

[0031] like Figure 3 As shown, the system power supply circuit 8 converts the mains power into 24V power and 5V power after rectification, filtering and voltage reduction to supply power to each circuit respectively. Figure 3As shown, the voltage detection circuit 10 includes a resistor R25, one end of the resistor R25 is respectively connected to one end of the capacitor C9 and the main control circuit 7, the other end of the capacitor C9 is grounded, the other end of the resistor R25 is respectively connected to one end of the resistor R24 ​​and one end of the resistor R28, the other end of the resistor R24 ​​is connected to the MCU power supply circuit 9, and the other end of the resistor R28 is grounded. In actual use, when the MCU power supply circuit 9 is over-voltage, the control chip U9 of the main control circuit 7 receives the over-voltage signal and performs over-voltage protection after receiving the over-voltage signal; the over-current comparison circuit 11 includes a capacitor C29, one end of the capacitor C29 is respectively connected to the main control circuit 7 and one end of the resistor R52, the other end of the resistor R52 is grounded, the other end of the capacitor C29 is respectively connected to the main control circuit 7 and one end of the resistor R53, and the other end of the resistor R53 is connected to the motor control circuit 4. In actual use, when an overcurrent occurs in the motor control circuit 4, the overcurrent comparison circuit 11 sends an overcurrent signal to the control chip U9 of the main control circuit 7, and performs overcurrent protection after receiving the overcurrent signal.

[0032] like Figure 3 As shown, the main control circuit 7 includes a main control chip U9, pins 1-3 and pins 22-24 of the main control chip U9 are respectively connected to the motor control circuit 4 to output the fan motor control signal, the main control chip U9 pin 4 is connected to the MCU power supply circuit 9, the main control chip U9 pin 6 is grounded, the main control chip U9 pin 7 is connected to the 5V power supply, the main control chip U9 pin 8 is connected to the voltage detection circuit 10 to receive the overvoltage detection signal, the main control chip U9 pins 10-11 are connected to the pull speed control input circuit 2 to receive the pull speed control signal, and the main chip U9 pin 12 is connected to the wall control signal level detection circuit 6 The main control chip U9 receives the wall control level signal, the main control chip U9 pin 13 is connected to the power on-off detection circuit 5 to receive the power on-off detection signal, the main control chip U9 pins 15-16 are respectively connected to the overcurrent comparison circuit 11 to receive the overcurrent detection signal, the main control chip U9 pins 17-18 are connected to the burning port circuit 13 to burn the program to the main control chip U9, the main control chip U9 pin 19 is connected to the remote control input circuit 3 to receive the remote control signal, the main control chip U9 pin 20 is connected to the buzzer circuit 12 to control the buzzer working feedback prompt, and the main control chip U9 pin 21 is connected to the MCU power supply circuit 9.

[0033] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control, characterized in that: The system comprises a wall control input circuit (1) connected to the mains for inputting a wall control signal, a speed control input circuit (2) for inputting a speed control signal, a remote control input circuit (3) for receiving a remote control signal, and a motor control circuit (4) for driving a fan motor to work. The wall control input circuit (1) is connected to a power on / off detection circuit (5) for detecting the power on / off state and a wall control signal level detection circuit (6) for detecting the level of the wall control control signal. The system also comprises a main control circuit (7) respectively connected to the power on / off detection circuit (5), the wall control signal level detection circuit (6), the speed control input circuit (2), the remote control input circuit (3), and the motor control circuit (4), for reading the wall control level signal of the wall control signal level detection circuit (6) after the power on / off detection circuit (5) detects that the power is on for a period of time, and controlling the motor control circuit (4) to drive the fan motor to work according to the wall control level signal or the speed control signal or the remote control signal.

2. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 1, characterized in that: The wall control input circuit (1) is connected to a system power supply circuit (8) for converting alternating current into direct current and supplying power to a power on / off detection circuit (5), a wall control signal level detection circuit (6), a remote control input circuit (3), and a motor control circuit (4) respectively. The system power supply circuit (8) is connected to an MCU power supply circuit (9) for supplying power to a main control circuit (7).

3. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The main control circuit (7) is connected to a voltage detection circuit (10) for detecting the supply voltage of the MCU power supply circuit (9) for overvoltage protection, and an overcurrent comparison circuit (11) for collecting the current of the motor control circuit (4) and comparing it for overcurrent protection.

4. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The main control circuit (7) is connected to a buzzer circuit (12) for providing sound feedback of the working state, and the system power supply circuit (8) supplies power to the buzzer circuit (12).

5. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The wall control input circuit (1) comprises a switch SW1, one end of the switch SW1 is connected to the live wire of the mains, the other end of the switch SW1 is respectively connected to the positive end of a diode D2 and the negative end of a diode D1, the negative end of the diode D2 is connected to one end of a switch POWE, the positive end of the diode D1 is connected to a switch OP, one end of a capacitor C1 is connected to the neutral wire of the mains, the other end of the capacitor C1 is respectively connected to the other end of the switch OP, the other end of the switch POWE, a power on / off detection circuit (5), a wall control signal level detection circuit (6), and a system power supply circuit (8).

6. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The power on / off detection circuit (5) comprises a photocoupler U12, wherein pin 1 of the photocoupler U12 is connected to the neutral line of the mains, pin 2 of the photocoupler U12 is connected to the wall control input circuit (1), pin 3 of the photocoupler U12 is respectively connected to one end of a resistor R94 and a main control circuit (7), the other end of the resistor R94 is grounded, and pin 4 of the photocoupler U12 is connected to a 5V power supply via a resistor R95.

7. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The wall control signal level detection circuit (6) includes a photocoupler U11, wherein pin 1 of the photocoupler U11 is respectively connected to one end of a bidirectional breakdown diode D6 and a neutral line of a mains power supply, pin 2 of the photocoupler U11 is respectively connected to the other end of the bidirectional breakdown diode D6 and one end of a resistor R57, the other end of the resistor R57 is connected to the wall control input circuit (1), pin 3 of the photocoupler U11 is grounded, pin 4 of the photocoupler U11 is respectively connected to one end of a capacitor C53, one end of a resistor R64, and one end of a resistor R65, the other end of the capacitor C53 is grounded, the other end of the resistor R64 is connected to a main control circuit (7), and the other end of the resistor R65 is connected to a 5V power supply.

8. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The pulling speed control input circuit (2) comprises a connection terminal J2 connected to the pull rope switch for forward and reverse direction switching and a connection terminal J4 connected to the pull rope speed regulator for speed regulation, the connection terminal J2 pin 1 is grounded, the connection terminal J2 pin 2 is respectively connected to the main control circuit (7) and one end of a resistor R26, and the other end of the resistor R26 is connected to a 5V power supply; The pin 1 of the connection terminal J4 is grounded, the pin 2 of the connection terminal J4 is respectively connected to the main control circuit (7) and one end of the resistor R54, and the other end of the resistor R54 is connected to a 5V power supply.

9. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 2, characterized in that: The remote control input circuit (3) includes a remote control receiving chip U10, wherein pin 1 of the remote control receiving chip U10 is grounded, pin 2 of the remote control receiving chip U10 is respectively connected to one end of a capacitor C45 and one end of an inductor L5, the other end of the inductor L5 is grounded, the other end of the capacitor C45 is respectively connected to one end of a capacitor C43, an antenna ANT, and one end of an inductor L4, the other end of the capacitor C43 and the other end of the inductor L4 are respectively grounded, pin 4 of the remote control receiving chip U10 is respectively connected to one end of a capacitor C41 and a 5V power supply, the other end of the capacitor C41 is grounded, pin 4 of the remote control receiving chip U10 is grounded via a capacitor C42, pin 5 of the remote control receiving chip U10 is connected to the main control circuit (7) via a resistor R35, pin 6 of the remote control receiving chip U10 is grounded, pin 8 of the remote control receiving chip U10 is connected to pin 3 of a crystal oscillator X1, and pins 1-2 and pin 3 of the crystal oscillator X1 are respectively grounded.

10. A DC variable frequency fan adjustment system integrating wall control, speed control and remote control according to claim 3, characterized in that: The voltage detection circuit (10) comprises a resistor R25, one end of the resistor R25 is respectively connected to one end of a capacitor C9 and a main control circuit (7), the other end of the capacitor C9 is grounded, the other end of the resistor R25 is respectively connected to one end of a resistor R24 ​​and one end of a resistor R28, the other end of the resistor R24 ​​is connected to an MCU power supply circuit (9), and the other end of the resistor R28 is grounded; the overcurrent comparison circuit (11) comprises a capacitor C29, one end of the capacitor C29 is respectively connected to the main control circuit (7) and one end of a resistor R52, the other end of the resistor R52 is grounded, the other end of the capacitor C29 is respectively connected to the main control circuit (7) and one end of a resistor R53, and the other end of the resistor R53 is connected to a motor control circuit (4).

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