Bidirectional Asymmetric PWM Resonant DC/DC Converter With Wide Voltage-Conversion Ratio

초록

This article proposes a reconfigurable bidirectional resonant DC/DC converter that can operate under wide ranges of forward voltage-conversion ratio M-f and backward voltage-conversion ratio M-b. In the forward direction, the proposed converter operates as a full-wave resonant buck converter with two-level voltage V-cd (when M-f <1), as a half-wave resonant boost converter with three-level voltage V-cd (when 1 <= M-f <2), and as a half-wave resonant boost converter with two-level V-cd (when M-f >= 2). In the backward direction, the proposed converter operates as a full-wave resonant boost converter with two-level voltage V-cd (when M-b >= 1), as a half-wave resonant buck converter with three-level V-cd (when 0.5 <= M-b<1), and as a half-wave resonant buck converter with two-level V-cd (when M-b<0.5). We acquire accurate voltage-gain equations according to the duty and the output power for the half-wave resonant boost converter that has three-level V-cd in the forward direction and for the half-wave resonant buck converter that has a three-level V-cd in the back-ward direction. We provide a detailed design guideline for the proposed converter, considering three operation modes in each power-flow direction. The proposed bidirectional converter and its switching modulation scheme were verified experimentally using a 200-V similar to 1000-V/1-kW hardware prototype that was fed 400-V input.

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