Comparison of PWM Strategies for Three-Phase Current-fed DC/DC Converters

Han-Ju Cha; Soon-Ho Choi; Byung-Moon Han

Comparison of PWM Strategies for Three-Phase Current-fed DC/DC Converters

Han-Ju Cha

Soon-Ho Choi

Byung-Moon Han

Vol. 8, No. 4, pp. 363-370, Oct. 2008

10.6113/JPE.2008.8.4.363

Three-phase dc/dc converter

Three-phase PWM strategy

Losses

Active clamp

Efficiency

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Abstract

In this paper, three kinds of PWM strategies for a three-phase current-fed dc/dc converter are proposed and compared in terms of losses and voltage transfer ratio. Each PWM strategy is described graphically and their switching losses are analyzed. With the proposed PWM C strategy, one turn-off switching of each bridge switch is eliminated to reduce switching losses under the same switching frequency. In addition, RMS current through the bridge switches is lowered by using parallel connection between two bridge switches and thus, conduction losses of the switches are reduced. Further, copper losses of the transformer are decreased due to the reduced RMS current of each transformer’s winding. Therefore, total losses are minimized and the efficiency of the converter is improved by using the proposed PWM C strategy. Digital signal processor (DSP: TI320LF2407) and a field-programmable gate array (FPGA: EPM7128) board are used to generate PWM patterns for three-phase bridge and clamp MOSFETs. A 500W prototype converter is built and its experimental results verify the validity of the proposed PWM strategies.

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Cite this article

[IEEE Style]

H. Cha, S. Choi, B. Han, "Comparison of PWM Strategies for Three-Phase Current-fed DC/DC Converters," Journal of Power Electronics, vol. 8, no. 4, pp. 363-370, 2008. DOI: 10.6113/JPE.2008.8.4.363.

[ACM Style]

Han-Ju Cha, Soon-Ho Choi, and Byung-Moon Han. 2008. Comparison of PWM Strategies for Three-Phase Current-fed DC/DC Converters. Journal of Power Electronics, 8, 4, (2008), 363-370. DOI: 10.6113/JPE.2008.8.4.363.