Control circuit for fan

A control circuit for a fan, the fan comprising a fan head equipped with a first motor and fan blades connected to the first motor, wherein the control circuit comprises an MCU, a stepless regulation circuit and a first driving circuit both connected to the MCU;

• the stepless regulation circuit comprises a stepless regulator for user operation, the first driving circuit is also electrically connected to the first motor, the stepless regulation circuit is configured to send back corresponding electrical signals to the MCU based on the user operation provided on the stepless regulator, and the MCU is configured to control a power output of the first driving circuit to the first motor based on the electrical signal from the stepless regulation circuit,
• wherein the stepless regulator is a potentiometer or a rotary encoder switch;
• wherein the control circuit further comprises a power module electrically connected to the MCU, the first driving circuit, and the stepless regulation circuit,
• wherein the fan further comprises a second motor for controlling a rotation of the fan head, the control circuit comprising a second driving circuit and a first switch electrically connected to the MCU;
• the second driving circuit is electrically connected to the power module and the second motor, respectively;
• the MCU is configured to drive the second motor to work through the second driving circuit based on the electrical signal from the first switch;
• wherein the second driving circuit comprises a motor driving chip, a first filtering unit, a second filtering unit, and a second interface;
• the first filtering unit is electrically connected to an output end of the power circuit and the motor driving chip, and the first filtering unit is configured to filter the voltage output from the power circuit before supplying it to the motor driving chip;
• the second filtering unit is electrically connected to the motor driving chip and the second interface, and the second interface is connected to the second motor:
• the second filtering unit is configured to filter the driving voltage output from the motor driving chip before supplying it to the second motor;
• the sixth and seventh pins of the motor driving chip are grounded, and SDA and SCK pins of the motor driving chip are electrically connected to the MCU.

A control circuit for a fan, the fan comprising a fan head equipped with a first motor and fan blades connected to the first motor, wherein the control circuit comprises an MCU, a stepless regulation circuit and a first driving circuit both connected to the MCU;

• the stepless regulation circuit comprises a stepless regulator for user operation, the first driving circuit is also electrically connected to the first motor, the stepless regulation circuit is configured to send back corresponding electrical signals to the MCU based on the user operation provided on the stepless regulator, and the MCU is configured to control a power output of the first driving circuit to the first motor based on the electrical signal from the stepless regulation circuit,
• wherein the control circuit further comprises a power module electrically connected to the MCU, the first driving circuit, and the stepless regulation circuit,
• wherein the power circuit comprises a charging and discharging chip, a fifth resistor, a fourth capacitor, and a fifth capacitor:
• the second pin of the charging and discharging chip is grounded through the fifth resistor, the fourth pin of the charging and discharging chip is grounded through the fourth capacitor, and the fifth pin of the charging and discharging chip is grounded through the fifth capacitor;
• the positive pole of the battery is electrically connected to the fifth pin of the charging and discharging chip, and the seventh pin of the charging and discharging chip is connected to the MCU for temperature monitoring of MCU.