A fan control circuit

Abstract

The utility model discloses a fan control circuit, including power, main control MCU, 433MHz wireless reception, display drive, speed regulation drive, signal acquisition, alarm and key input module. Power module is connected with multiple module electricity respectively, and wireless reception module output end is connected with MCU receiving end, and transmission wireless control instruction, and key input module is connected with MCU input pin, and signal acquisition module signal output end is connected with MCU external interruption / capture pin, and transmission fan speed feedback signal, and the PWM signal output end of MCU is connected with speed regulation drive module, and the output gear corresponds PWM control signal, and the display drive signal output end of MCU is connected with display drive module signal input end, and display drive module is connected with LCD screen, and the alarm signal output end of MCU is connected with alarm module, and alarm module contains buzzer and LED pilot lamp. The utility model can promote wireless communication reliability, realize fan speed direct observation and abnormal alarm, and improve the overall performance of fan control simultaneously.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of microcontroller and circuit technology, and in particular to a fan control circuit. Background Technology

[0002] Traditional wind turbine control often uses local buttons or simple analog speed adjustment methods. In wireless control scenarios, the signal is easily interfered with, leading to incorrect command recognition. Furthermore, it lacks real-time monitoring of wind turbine speed and abnormal alarm functions. In addition, speed adjustment relies heavily on analog circuits, resulting in poor accuracy in matching gears and speeds. It is also difficult to easily expand additional functions such as display and alarms, resulting in insufficient reliability and ease of use of the overall control. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims. This invention aims to at least address one of the technical problems existing in the prior art. To this end, embodiments of this invention provide a wind turbine control circuit that, by optimizing wireless signal processing and adding speed monitoring and alarms, improves the reliability of wireless communication, enables intuitive monitoring of wind turbine speed and abnormal alarms, simplifies control logic, and improves the overall performance of wind turbine control.

[0004] This utility model embodiment provides a fan control circuit, including a power supply module, a main control MCU module, a 433MHz wireless receiving module, a display driver module, a speed control driver module, a signal acquisition module, an alarm module, and a key input module. The output terminal of the power supply module is connected to the power input terminals of the main control MCU module, the 433MHz wireless receiving module, the display driver module, and the speed control driver module, respectively. The signal output terminal of the 433MHz wireless receiving module is connected to the serial port receiving terminal of the main control MCU module for transmitting decoded wireless control commands. The signal output terminal of the key input module is connected to the main control MCU module. The signal acquisition module's signal output terminal is connected to the external interrupt / capture pin of the main control MCU module for transmitting the fan speed feedback signal; the main control MCU module's PWM signal output terminal is connected to the speed control drive module's signal input terminal for outputting the PWM control signal corresponding to the gear; the main control MCU module's display drive signal output terminal is connected to the display drive module's signal input terminal, and the display drive module's output terminal is connected to the LCD screen; the main control MCU module's alarm signal output terminal is connected to the alarm module's signal input terminal, and the alarm module includes a buzzer and LED indicator.

[0005] According to some embodiments of the present invention, the circuit further includes a VSP speed regulation voltage acquisition module, the signal output terminal of which is connected to the ADC analog input pin of the main control MCU module for acquiring external speed regulation voltage signals.

[0006] According to some embodiments of the present invention, the 433MHz wireless receiving module further includes a receiving indicator light. The control terminal of the receiving indicator light is connected to the general output pin of the main control MCU module. When the 433MHz wireless receiving module receives the same command three times in a row, the indicator light flashes three times synchronously.

[0007] According to some embodiments of this utility model, the display driver module adopts an HK1621 driver chip, the main control MCU module is connected to the HK1621 driver chip through a parallel or serial interface, the HK1621 driver chip is connected to a backlight modulation circuit, and the control terminal of the backlight modulation circuit is connected to the general output pin of the main control MCU module.

[0008] According to some embodiments of the present invention, the speed control drive module receives an enable signal output by the main control MCU module, and the enable signal is used to start or stop the output of the speed control drive module.

[0009] According to some embodiments of this utility model, the control terminal of the buzzer is connected to the ALM pin of the main control MCU module, and the control terminal of the LED indicator is connected to the general output pin of the main control MCU module.

[0010] According to some embodiments of the present invention, the key input module includes at least a gear up key, a gear down key, a power button, and a setting key.

[0011] According to some embodiments of this utility model, the PWM duty cycle output by the PWM signal output terminal of the main control MCU module is linearly related to the gear position.

[0012] According to some embodiments of this utility model, the signal transmitted by the signal acquisition module is a square wave signal whose frequency is proportional to the fan speed.

[0013] According to some embodiments of this utility model, when the main control MCU module detects that the fan speed is too high or has no speed, it sets the ALM alarm signal high and triggers the buzzer alarm.

[0014] The present invention has at least the following beneficial effects: the fan control circuit, through the collaboration of various modules, can realize both wireless and button control, making it convenient to adjust the fan; it can collect the fan speed in real time and alarm in case of abnormality, improving the safety of use; it can accurately adjust the speed with the help of PWM signal to meet different air volume requirements; it can also intuitively display the operating status, making it convenient for users to master and control, and overall ensuring the reliability and ease of use of the fan control.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0017] Figure 1 This is a schematic diagram of a circuit module provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of an MCU module provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of another part of the circuit module provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of another part of the circuit module provided in one embodiment of this utility model; Figure 5 This is a schematic diagram of a speed control drive module provided in one embodiment of the present invention; Figure 6 This is a signal processing flowchart provided in one embodiment of the present invention; Figure 7 This is a schematic diagram of the overall process provided in one embodiment of the present invention. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] See Figure 1-5 The circuit as a whole includes a power supply module, a main control MCU module, a wireless receiver module (433MHz), a display driver module, a speed control driver module, an FG signal acquisition module, an alarm module, and a key input module.

[0024] The specific connection methods between modules are as follows: The output terminals of the power supply module are connected to the power input terminals of the main control MCU module, the wireless receiver module, the display driver module, and the speed control driver module, respectively. Specifically: the 5V output terminal of the power supply module is connected to the Vcc pin of the main control MCU module, the 5V output terminal of the power supply module is connected to the 5V pin of the wireless receiver module, the 5V output terminal of the power supply module is connected to the VDD pin of the display driver module, the GND terminal of the power supply module is connected to the GND pin of the main control MCU module, the GND terminal of the power supply module is connected to the GND pin of the wireless receiver module, the GND terminal of the power supply module is connected to the VSS pin of the display driver module, and the GND terminal of the power supply module is connected to the GND terminal of the speed control driver module.

[0025] The signal output terminal of the wireless receiver module is connected to the serial port receiver terminal of the main control MCU module to transmit the decoded wireless control commands. Specifically, the RX signal output terminal of the wireless receiver module is connected to the serial port receiver RX pin of the main control MCU module.

[0026] The signal output terminals of the button input module are connected to the general-purpose input pins of the main control MCU module. Specifically: the KEY1 signal output terminal of the button input module is connected to the KEY1 pin of the main control MCU module, the KEY2 signal output terminal of the button input module is connected to the KEY2 pin of the main control MCU module, the SWDIO1 signal output terminal of the button input module is connected to the SWDIO pin of the main control MCU module, and the SWCLK1 signal output terminal of the button input module is connected to the SWCLK pin of the main control MCU module.

[0027] The signal output terminal of the FG signal acquisition module is connected to the external interrupt / capture pin of the main control MCU module to transmit the FG signal for fan speed feedback. Specifically, the FG_O signal output terminal of the FG signal acquisition module is connected to the PA1 / AD0 pin of the main control MCU module.

[0028] The PWM signal output terminal of the main control MCU module is connected to the signal input terminal of the speed control drive module to output the PWM control signal corresponding to the gear. Specifically, the LED_PWM pin of the main control MCU module is connected to the signal input terminal of the speed control drive module.

[0029] The display driver signal output terminal of the main control MCU module is connected to the signal input terminal of the display driver module, and the output terminal of the display driver module is connected to the LCD screen. Specifically: the CS pin of the main control MCU module is connected to the CS pin of the display driver module, the WR pin of the main control MCU module is connected to the WR pin of the display driver module, and the DATA pin of the main control MCU module is connected to the DATA pin of the display driver module.

[0030] The alarm signal output terminal of the main control MCU module is connected to the signal input terminal of the alarm module. The alarm module includes a buzzer and an LED indicator. Specifically, the ALM_MCU pin of the main control MCU module is connected to the signal input terminal of the alarm module.

[0031] In one feasible embodiment, the circuit further includes a VSP speed regulation voltage acquisition module. The signal output terminal of the VSP speed regulation voltage acquisition module is connected to the ADC analog input pin of the main control MCU module for acquiring external speed regulation voltage signals. Specifically, the VSP signal output terminal of the VSP speed regulation voltage acquisition module is connected to the PA5 / CPP / AD2 pin of the main control MCU module.

[0032] In one feasible embodiment, the wireless receiving module also includes a receiving indicator light. The control terminal of the receiving indicator light is connected to the general-purpose output pin (LED1 pin) of the main control MCU module. When the wireless receiving module receives the same command three times in a row, the indicator light flashes three times synchronously. Furthermore, a damping resistor is added between the MCU RX and the 433 receiving module to eliminate signal ringing / overshoot / undershoot caused by parasitic inductance and capacitance of the line, making the signal waveform output by the receiving module cleaner and more stable, and improving the reliability of wireless communication.

[0033] In one feasible embodiment, the display driver module uses an HK1621 driver chip, and the main control MCU module is connected to the HK1621 driver chip through a parallel or serial interface. The HK1621 driver chip is connected to a backlight modulation circuit, and the control terminal of the backlight modulation circuit is connected to the general-purpose output pin of the main control MCU module. Specifically, the CS pin of the main control MCU module is connected to the CS pin of the HK1621 driver chip, the WR pin of the main control MCU module is connected to the WR pin of the HK1621 driver chip, the DATA pin of the main control MCU module is connected to the DATA pin of the HK1621 driver chip, and the control terminal of the backlight modulation circuit is connected to the general-purpose output pin of the main control MCU module.

[0034] In one feasible embodiment, the speed control drive module receives an enable signal output by the main control MCU module. This enable signal is provided by a general-purpose output pin of the main control MCU module and can be used to start or stop the output of the speed control drive module.

[0035] In one feasible embodiment, the PWM duty cycle output by the PWM signal output terminal (LED_PWM pin) of the main control MCU module is linearly related to the gear position. Specifically, the main control MCU module can output a PWM signal with a duty cycle of "gear position × 10%" to the speed control drive module according to the gear position. The duty cycle of the PWM signal output by the LED_PWM pin of the main control MCU module is linearly related to the gear position, and the duty cycle is "gear position × 10%".

[0036] In one feasible embodiment, the control terminal of the buzzer is connected to the ALM pin of the main control MCU module, and the control terminal of the LED indicator is connected to the general output pin of the main control MCU module; wherein the LED indicator lights up when the power is on and turns off when the power is off, the working state of the buzzer is synchronized with the ALM alarm signal output by the main control MCU module, and the buzzer alarms when the ALM signal is high.

[0037] In a feasible embodiment, the button input module includes at least four buttons: a gear up button, a gear down button, a power button, and a setting button. Specifically, the gear up button corresponds to SW1, the gear down button corresponds to SW2, the power button corresponds to SW3, and the setting button corresponds to SW4. Their signal terminals are respectively connected to the general-purpose input pins of the main control MCU module. Furthermore, SW1 and SW2 are multiplexed programming ports. After the first programming, simulation and programming operations cannot be performed again. The program must be cleared before programming can be performed again.

[0038] In one feasible embodiment, the FG signal transmitted by the FG signal acquisition module is a square wave signal whose frequency is proportional to the fan speed. Specifically, the signal transmitted from the FG_O signal output terminal of the FG signal acquisition module to the PA1 / AD0 pin of the main control MCU module is a square wave signal whose frequency is proportional to the fan speed.

[0039] In one feasible embodiment, the main control MCU module performs edge detection and counting on the FG signal, and calculates the rotational speed in conjunction with a timer. For example, the real-time rotational speed of the fan is calculated by averaging the FG signal according to the formula "rotational speed (RPM) = (FG signal count × 60) ÷ number of motor pole pairs". The rotational speed data is only used for display and does not participate in the closed-loop adjustment of the PWM output. The circuit adopts an open-loop control method, and the PWM output is determined only by the gear setting value.

[0040] In one feasible embodiment, when the main control MCU module detects that the fan speed is too high or has no speed, it sets the ALM alarm signal high and triggers the buzzer alarm. Specifically, when the main control MCU module detects that the fan speed is too high or has no speed, the ALM alarm signal output by the ALM_MCU pin of the main control MCU module is set high, triggering the buzzer alarm and the alarm indicator light to flash.

[0041] like Figure 6 and 7As shown, the specific processing flow of the circuit is as follows: When the remote control presses the +, -, power on, or setting buttons, it continuously sends the corresponding 433MHz wireless coded signal three times. After receiving the signal, the 433MHz wireless receiving module sends the decoded button information to the main control MCU module through the serial port. After the main control MCU module parses the button, the power on button controls the power on / off and outputs the enable signal, the + / - button adjusts the gear and calculates the PWM value of "gear × 10%" duty cycle and outputs it to the speed control drive module, which drives the fan to generate an FG signal. The FG signal acquisition module transmits the FG signal to the main control MCU module, which samples the FG signal to calculate the real-time speed. The setting button is used to set the alarm speed threshold. If the speed exceeds the limit or there is no speed, the main control MCU module sets the ALM alarm signal high, triggering the buzzer and alarm indicator light. At the same time, the main control MCU module controls the LCD screen through the HK1621 driver chip to visualize information such as air volume and current speed. The backlight of the HK1621 driver chip is modulated by the general output pin of the main control MCU module.

[0042] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A fan control circuit, characterized in that, The system includes a power supply module, a main control MCU module, a 433MHz wireless receiver module, a display driver module, a speed control driver module, a signal acquisition module, an alarm module, and a key input module. The output of the power supply module is connected to the power inputs of the main control MCU module, the 433MHz wireless receiver module, the display driver module, and the speed control driver module. The signal output of the 433MHz wireless receiver module is connected to the serial port receiver of the main control MCU module for transmitting decoded wireless control commands. The signal output of the key input module is connected to the general-purpose input pin of the main control MCU module. The signal output terminal of the signal acquisition module is connected to the external interrupt / capture pin of the main control MCU module for transmitting the fan speed feedback signal; the PWM signal output terminal of the main control MCU module is connected to the signal input terminal of the speed control drive module for outputting the PWM control signal corresponding to the gear; the display drive signal output terminal of the main control MCU module is connected to the signal input terminal of the display drive module, and the output terminal of the display drive module is connected to the LCD screen; the alarm signal output terminal of the main control MCU module is connected to the signal input terminal of the alarm module, and the alarm module includes a buzzer and an LED indicator.

2. The fan control circuit according to claim 1, characterized in that, The circuit also includes a VSP speed regulation voltage acquisition module. The signal output terminal of the VSP speed regulation voltage acquisition module is connected to the ADC analog input pin of the main control MCU module for acquiring external speed regulation voltage signals.

3. The fan control circuit according to claim 1, characterized in that, The 433MHz wireless receiving module also includes a receiving indicator light. The control terminal of the receiving indicator light is connected to the general output pin of the main control MCU module. When the 433MHz wireless receiving module receives the same command three times in a row, the indicator light flashes three times in a row.

4. The fan control circuit according to claim 1, characterized in that, The display driver module uses an HK1621 driver chip. The main control MCU module is connected to the HK1621 driver chip through a parallel or serial interface. The HK1621 driver chip is connected to a backlight modulation circuit. The control terminal of the backlight modulation circuit is connected to the general-purpose output pin of the main control MCU module.

5. The fan control circuit according to claim 1, characterized in that, The speed control drive module receives the enable signal output by the main control MCU module, and the enable signal is used to start or stop the output of the speed control drive module.

6. The fan control circuit according to claim 1, characterized in that, The control terminal of the buzzer is connected to the ALM pin of the main control MCU module, and the control terminal of the LED indicator is connected to the general output pin of the main control MCU module.

7. The fan control circuit according to claim 1, characterized in that, The key input module includes at least a gear up button, a gear down button, a power button, and a settings button.

8. The fan control circuit according to claim 1, characterized in that, The PWM duty cycle output by the PWM signal output terminal of the main control MCU module is linearly related to the gear position.

9. The fan control circuit according to claim 1, characterized in that, The signal transmitted by the signal acquisition module is a square wave signal whose frequency is proportional to the fan speed.

10. The fan control circuit according to claim 1, characterized in that, When the main control MCU module detects that the fan speed is too high or there is no speed, it sets the ALM alarm signal high and triggers the buzzer alarm.

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