| Summary: | 博士 === 國立臺灣科技大學 === 電子工程系 === 107 === The operations of the proposed three-phase wye-delta connected dual-active-bridge Series Resonant DC-DC Converter can be under either phase-shift (PS) mode or variable-frequency (VF) mode. For VF mode operation, The primary side Y-connected switch has zero voltage switching (ZVS), and the secondary side is -connected with a low switching loss, thus reducing switching losses and improving conversion efficiency. On the other hand, the PS mode operation with fixed switching frequency in inductive. Improve the problem of no-load distortion of the output voltage of the resonant circuit. Circuit principles and design procedures are presented and verified by the simulations and experimental results. Finally, a laboratory prototype with 2.2 kW rated power output is built and tested. Compare the efficiency of the two modes before light load, The measured efficiency is above 90 .
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