Abstract: A PWM controller device of a simple cooling fan includes a fan motor, a driver device, and a PWM controller device. The driver device is electrically connected to the fan motor. The PWM controller device is electrically connected to the fan motor and the driver device. The driver device internally detects the temperature rise variation of the electronic element and drives the fan motor to rotate in high speed. When the fan motor remains in high rotational speed as the temperature of the electronic element decreases, a PWM signal is input to the PWM controller device, which responsively generates a voltage-drop signal to drive the fan motor to its reduce rotational speed. The PWM controller device achieves control similar to that of a MCU, reduces manufacturing costs, and reduces over all physical size of the cooling fan. The invention is suitable for use in compact electronics.

Abstract: A temperature control device of a simple cooling fan includes a fan motor, a driver device, and a temperature control device. The driver device is electrically connected to the fan motor. The temperature control device is electrically connected to the fan motor and the driver device. The driver device detects the temperature rise variation of the electronic element and drives the fan motor to rotate in high speed. When the fan motor remains in high rotational speed as the temperature of the electronic element decreases, a voltage-drop signal is generated to drive the fan motor to its reduce rotational speed. The temperature control device achieves control abilities similar to that of a MCU, reduces manufacturing costs, and reduces over all physical size of the cooling fan, and is suitable for use in compact electronics.