高周波絶縁形ソフトスイッチング位相シフトPWM制御DC-DCコンバータの循環電流低減による効率改善

抄録

In this paper, a tapped inductor filter assisted high frequency isolated soft-switching phase-shift PWM DC-DC power converter is presented to reduce circulating current and improve the efficiency. The effectiveness of the proposed soft-switching DC-DC power converter is verified in an experiment and compared to the conventional ZVS phase-shift PWM DC-DC power converter and semi-soft-switching phase-shift PWM DC-DC power converter. The 700W-100kHz with 31-42V input side and 100V output side DC-DC converter circuit prototype using the power MOSFETs is built and tested. Compared to the conventional ZVS and semi-ZVS phase-shift PWM DC-DC converters the conversion efficiency of the proposed ZVZCS phase-shift PWM DC-DC converter is significantly improved. The proposed DC-DC converter actual efficiency is measured as 93-97% over the wide output voltage regulation ranges and load variations.