Title: Flyback converter using single-capacitor snubber for auto-tuning fan speed system

Authors: S-Y. Tseng, G-K. Chang, P-F. Chen, S-T. Peng, S-Y. Fan

Addresses: GreenPower Evolution Applied Research Lab (G-PEARL), Department of Electrical Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan. ' Department of Electrical Engineering, Wufeng Institute of Technology, No. 117, Sec. 2, Jianguo Rd., Minsyong Township, Chiayi County 621, Taiwan. ' GreenPower Evolution Applied Research Lab (G-PEARL), Department of Electrical Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan. ' GreenPower Evolution Applied Research Lab (G-PEARL), Department of Electrical Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan. ' Department of Electrical Engineering, Wufeng Institute of Technology, No. 117, Sec. 2, Jianguo Rd., Minsyong Township, Chiayi County 621, Taiwan

Abstract: This paper presents flyback converter combined with single-capacitor turn-off snubber for auto-tuning fan speed system. The proposed system can automatically adjust rotational speed of fan, depending on the temperature in the chassis of the equipment. Its control algorithm is realised by a PWM IC which, by taking into account the converter output voltage and chassis temperature, will regulate the output voltage of the converter. With this approach, the wear and tear of the bearing of fan can be reduced and the circuit structure, compared with the conventional two stage driving circuit, can be simplified. Therefore, the proposed system can raise conversion efficiency, reduce component count, weight and size. Moreover, in order to further increase conversion efficiency of the proposed system, a single-capacitor turn-off snubber is adopted to reduce switching loss at turn off transition, Finally, a prototype under output voltage varied from 5 V-12 V and maximum output power of 200 W has been implemented to prove the feasibility of the proposed auto-tuning fan speed system.

Keywords: flyback converters; single-capacitor snubbers; power electronics; auto-tuning; fan speed systems; rotational speed; temperature; fan bearings; wear; conversion efficiency.

DOI: 10.1504/IJPELEC.2010.035869

International Journal of Power Electronics, 2010 Vol.2 No.4, pp.428 - 441

Received: 24 Feb 2010
Accepted: 08 Apr 2010
Published online: 07 Oct 2010 *

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