Fitipower Integrated Technology, Inc.

Tsung-Jen Lin

Kai-Ping Lin

Kai-Chi Lin

An exemplary fan driving system includes a driving device and a MOSFET group. The driving device includes a first adjustable resistor connected between its first voltage signal input terminal and ground, and a second adjustable resistor connected between its second voltage signal input terminal and ground. The MOSFET group includes two N-type MOSFETs and two P-type MOSFETs. The first terminal of the fan is connected to an anode of Dand a cathode of D. The second terminal of the fan is connected to an anode of Dand a cathode of D. Cathodes of the Dand Dare configured to connect a supply voltage. Anodes of the Dand Dboth are grounded. The fan driving system can effectively discharge off the residual current in the coil of the fan at the moment of the MOSFET group being switched off.

Fan driving system with safe driving current switching

An exemplary driving apparatus capable of generating a driving current, including: an analog input generating circuit, an analog input driving circuit, and an output circuit. The analog input generating circuit is electrically connected between a first voltage source and the ground and configured (i.e., structured and arranged) for supplying an adjustable analog signal. The analog input driving circuit is electrically connected between a second voltage source and the ground and configured for converting the analog signal into a pulsed signal. The output circuit is configured for converting the pulsed signal into a driving current as an output. The frequency of the pulsed signal can be adjusted via adjusting the analog signal and thereby varying the driving current. Thus the driving current can be adapted for the different target loads.

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Hsinchu, Taiwan

Tsung-Jen Lin