中文摘要：

提出了一种零电流开关（ZCS）的谐振变换器,变压器副边采用倍压结构,由谐振电容和变压器漏感组成的LC谐振可实现电路中能量的传递。电路采用调频工作,开关频率小于谐振频率,使得开关管和二极管都能获得ZCS。原边开关管电压应力取决于原边电路结构,副边二极管只承受输出电压。详细分析了各工作模式,基于基波分析法推导了电路的电压增益与频率比m、漏感系数h以及品质因数Q的关系,表明了变压器副边绕组可以比传统设计减半。针对在车载逆变器样机的应用,对该电路提出了一种高效的设计方案。最后,建立了一个21~28V输入/额定功率600W的逆变样机,实验波形及较高的变换效率验证了电路的正确性及设计方案的可行性。

英文摘要：

A zero-current-switching resonant converter is proposed with a voltage-doubling structure on the secondary side. The energy is transferred by resonance between the voltage-doubling capacitance and the leakage inductor.The converter adopts frequency-modulating method with switching frequency less than resonant frequency. All power switches and diodes can achieve ZCS. Voltage stresses on transistors are up to the structure on primary side,while voltage stresses on diodes are output voltage. Operation modes are elaborated. The relation among voltagegain and frequency ratio m,magnetizing inductance / leakage inductor ratio h and quality factor Q,is derived. The turns of the secondary-side winding are half of that in a traditional push-pull converter. Taking an inverter applied in a vehicle for example,an optimal design method is deduced. At last,a 20 ~ 28 V input /600 W inverter prototype is built. The test waveforms and a high efficiency verifies the feasibility of the converter and optimal designing.