一种新型零电压零电流开关三电平DC/DC变换器的研究

该文介绍了一种新型的带有简单辅助电路的零电压零电流开关（ZVZCS）三电平DC/DC变换器，它的辅助电路不含耗能元件和有源开关，可实现超前管的零电压开通和滞后管的零电流关断。耦合电感取代了常规滤波电感，它所感应出的电压由功率变压器反射到初级，使得变换器在零状态时的循环电流减小到零。通过改变耦合线圈的匝数比，可以任意设置用于电流回零的电压幅值的大小，调节电流回零的时间。文中介绍了该变换器的工作原理，讨论了设计参数。通过实验验证，该电路具有辅助电路简单、效率高、整流二极管承受的电压低和环流自动调节等优点，适用于高电压、大功率的应用场合。

A Novel ZVZCS Three Level DC/DC Converter Using a Simple Auxiary Circuit

In this paper,a novel zero-voltage and zero-current-switching(ZVZCS)three-level converter is presented,which consists of a simple auxiliary circuit in the secondary winding.The leading switching can realize ZVS and the lagging switching can realize ZCS with phase shift technique.Through introducing a coupled inductor replacing the common output inductor,the induced voltage of the coupled inductor in the second side is reflected to the primary side of the power transformer and is used to reset the circulating current at the zero state.By regulating the winding ratio of the coupled inductor,the voltage is used to reset the primary current can be easy adjusted.The operation and parameter design are disscused.,and experimental results are also given.The converter has feature high efficienct,lower voltage stress of the rectifier diode and self-adjustment of the circuit,suitable for high voltage and high power applications.