دانلود مقاله ISI جبران کننده فیدفوروارد فرکانس کاری برای مبدل APWM HB Flyback

عنوان انگلیسی مقاله:
Feed-Forward Compensator of Operating Frequency for APWM HB Flyback Converter

ترجمه فارسی عنوان  مقاله:
جبران کننده فیدفوروارد فرکانس کاری برای مبدل APWM HB Flyback

چکیده انگلیسی مقاله:
Abstract- A feed-forward frequency compensator for an asymmetrical pulsewidth modulated (APWM) half-bridge (HB) ?yback converter is proposed to increase its power conversion ef?ciency. Under a variable input voltage, the APWM HB ?yback converter cannot be satis?ed with the zero-current switching (ZCS) condition of output recti?ers because the variation of the turn-ON duration of main switches, which regulate the output voltage, induces their improper turn-OFF duration. This means that the resonance of a primary current during the turn-OFF of the switches is out of the ZCS operation of the output recti?ers. To avoid this improper operation, the resonant network should be designed with a marginal turn-OFF duration that guarantees the ZCS. However, this makes the converter operate with poor ef?ciency because of increasing conduction losses. The proposed feed-forward frequency compensator can properly change the converters operating frequency to reduce the conduction losses according to the variation of the input voltage satisfying the ZCS condition of the output recti?ers. Operation principles, steady-state analysis, and soft-switching conditions are analyzed to derive the frequency compensation algorithm of the APWM HB ?yback converter. Experimental results using a 240-W prototype converter show that the proposed compensation algorithm can improve the power conversion ef?ciency of the APWM HB ?yback converter under the input-voltage variation.

منتشر کننده مقاله: IEEE

سال انتشار مقاله: 2012

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