Adda Corporation

Chao-Ching Chen

Hsin-mao Hsieh

Mag Chen

A thin fan structure is composed of a driving unit and a rotating unit. The driving unit has a base, a coil circuit board and a shaft, in which the coil circuit board is disposed at the base. The rotating unit has a bearing, a fan blade, an iron-containing metal sheet and a magnet, in which the bearing has an outer ring and an inner ring. The fan blade, the iron-containing metal sheet and the magnet are fixed at the outer ring of the bearing, the inner ring of the bearing is fixed at the shaft of the driving unit and the coil circuit board of the driving unit is able to drive the rotating unit turning around.

Thin fan structure

A multimode integrated modulation circuit for controlling the fan rotating speed mainly includes a voltage regulating circuit, an integrated modulation circuit and a fan motor driving circuit. The voltage regulating circuit is used to receive an external voltage signal and regulate the external voltage signal to a suitable range of workable voltage and then a first output voltage is generated. The integrated modulation circuit that is electrically connected with the voltage regulating circuit is used to receive a PWM signal with a duty cycle and a second output voltage is accordingly generated depending on the product of the duty cycle of PWM signal and the first output voltage. The fan motor driving circuit is used to receive the second output voltage and decide the fan motor rotating speed depending on the second output voltage. Therefore, the present invention substantially adopts low-price circuit elements to integrate voltage regulating mode and PWM mode for controlling the fan rotating speed.

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Fengshan, Taiwan

Chao-Ching Chen