中文摘要：

提出一簇基于零电压零电流脉宽调制（pulse width—modulation，PWM）开关单元的新型零电压零电流（zero—current and zero—volt-age switching，ZC—ZVS）PWM变换器。新型零电压零电流PWM变换器的主开关工作在零电流开关状态，辅助开关工作在零电压开关状态，无源器件二极管工作在零电流状态。新型变换器工作频率恒定，减少了换流损耗。与硬开关变换器相比，新型零电压零电流变换器主开关的电流电压应力都没有增加。分析新型零电压零电流BOOST变换器的工作原理。仿真结果验证这簇新型零电压零电流变换器的可行性。

英文摘要：

A new family of zero-current and zero-voltage switching （ZC-ZVS） pulse width-modulation （PWM） converters was proposed, based on a new ZC-ZVS PWM switch cell. The main switches operate at ZCS on and off, the auxiliary switches operate at ZVS on and off, and the passive semi-conductor devices in the ZC-ZVS converters operate at ZCS on and off. In addition to operating at constant frequency and reducing commutation losses, the new converters have no additional current stress or conduct loss in the main switch in comparison to hard-switching converters. The principle of the new ZC-ZVS PWM Boost converter was analyzed, The simulation results of the ZC-ZVS PWM converter are provided to verify the performance of the new ZC-ZVS PWM converters.