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中文摘要：
提出了一种副边双谐振软开关全桥直流变压器（SDR-FB DCX）。其原边利用励磁电感储存能量在全负载范围内实现了开关管的零电压开关，同时副边采用谐振电路．实现了整流二极管的零电流关断，从而减小开通损耗和反向恢复损耗．提高了SDR—FB DCX的效率。SDR-FB DCX消除了整流二极管的电压尖峰与振荡，将整流二极管电压箝位于输出电压。减小了整流二极管的电压应力。详细分析了SDR—FB DCX的工作模态及稳态特性，分析结果表明其输入／输出电压增益比表现为直流变压器的工作特性，电压增益比与负载、开关频率和占空比无关。给出了SDR．FBDCX软开关的实现条件。最后通过搭建一台1kW、400V／48V的实验样机．验证了理论分析的正确性。
英文摘要：
A kind of SDR-FB DCX（Secondary Dual Resonant Full-Bridge DC-DC transformer） is proposed, which adopts the magnetic inductance at its primary side for energy storage to achieve the zero voltage switching of power switches in entire operating range and the resonant tank at its secondary side to achieve the zero current switching of rectifier diodes. The switch loss and diode reverse-recovery loss are thus decreased and the efficiency is increased. The voltage spike and oscillation of rectifier diode are eliminated and its voltage is clamped below the output voltage to decrease its voltage stress. The operational modes and static-state performance of the proposed SDR-FB DCX are analyzed and results show its input/output voltage gain ratio is represented as the operating features of DC transformer,independent of the output load,switching frequency and duty cycle. The realization condition of its soft switching is discussed. The experimental results of a 1 kW 400 V/48 V prototype verify the correctness of theoretical analysis.
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