Compared with those converters that need an auxiliary switch to make the main switching device working in soft - switching condition , the converters this paper present , are simple , easily controlled and cost less , but still maintain the merits of soft - switching for the main switching devices 这些变换器与那些需要辅助开关来实现主开关的软开关工作的变换器相比，具有结构简单、易于控制、成本较低的优点。所提出的新型功率因数校正软开关变换器除具有以上优点外，还能有效解决二极管的反向恢复所带来的问题。
All the power devices including main switches and auxiliary switches are in soft - switching condition ( zvs or zcs ) , while the freewheeling diodes are turned off in zero current condition . besides , the control of resonance between inductance and capacitor can be easily realized without needing of setting the threshold values of the inductance current 该电路中主开关和辅助开关均满足zvs或zcs条件，续流二极管也工作在软关断方式，并且电感和电容之间的谐振控制不需要设定电感电流阈值，控制逻辑简单，可实现四象限运行。
In this paper , two different passive snubber cells are proposed . by using the proposed snubber cells , the turn - on di / dt was restrained by a small inductor , and the turn - off dv / dt was restrained by a small capacitor . based on those two snubber cells , a new family of converters was introduced and an advanced pfc converter was designed 本文提出了两种新型无源无损的缓冲电路单元，通过使用该缓冲电路单元，主开关开通时所产生的di dt被一个较小电感所限制，主开关关断时所产生的dv dt被一个小电容所限制，从而实现了主开关器件的软开关变换。
The parallel inverters can expand the capacity so that they greatly improve the power system ' s flexibility and thus the system ' s volume and weight are remarkably reduced . the current stress of the power switch is considerably lessened which means higher reliability , lower cost and higher power density 多台逆变器并联实现扩容可大大提高系统的灵活性，使电源系统的体积重量大为降低，同时其主开关器件的电流应力也可大大减少，从根本上提高可靠性、降低成本和提高功率密度。
To realize the controllation of system we apply 8xc196mc to provide spwm signal , at the same time we use assistant circuit to control those assistant switch . in final section the problem of the inverter is concluded and the new method to realize the controllation of system is presented . in the end the prospective research direction is discussed 以新型谐振过渡软开关逆变器为对象，以87c196mc为核心用单片机c语言来软件产生spwm波形控制逆变桥主开关，同时又用硬件电路实现了辅助开关的控制，从而实现整个系统的控制。
