Koji Soshin

Practical Design Considerations for High-Frequency Soft-Switching PWM DC-DC Power Converter with Tapped Inductor Filter

In this paper, practical design considerations for the novel prototype of the high frequency transformer link full-bridge type soft-switching phase-shift PWM controlled DC-DC power converter with ZVS and ZCS bridge legs using tapped inductor filter are presented. The proposed tapped inductor filter assisted phase-shift PWM DC-DC converter can achieve constant frequency soft-switching operation under conditions of the wide load range and input voltage variations and to minimize circulating current, which occurs due to presence of the leakage inductance of the high frequency transformer. The optimum practical design of the tapped inductor turns ratio is significant to effectively reduce circulating current and achieve high efficiency of the DC-DC power conversion under 100kHz high frequency operation. The 1kW-100kHz with 36V input DC source and 100V output side breadboard circuit using the power MOSFETS is built and tested. The actual efficiency 97% is obtained at maximum. キ ー ワー ド: フル ブ リッジDC-DCコ ンバ ー タ, 高周 波 絶縁 トラン ス, 位相 シフ トPWM制 御, ソフ トス イ ッチ ン グ, タ ップ付 イ ン ダク タ形 フ ィル タ, 車 載用AC電 源