S. Jin’s scientific contributions

In order to realize a simple topology, high efficiency, high frequency, low voltage stress, easy to control soft switching three phase inverter, A novel Passive Assisted Soft Switching Converter is presented in the paper. Soft Switching of the switch can be achieved by using Passive Assisted Resonant network. It is very attractive for high power application where IGBT is predominantly used as the power switch. Its operation principle is analyzed through its application to the boost converter. The condition of soft switching and the design considerations are analyzed in detail. The novel soft switching cell can be also used in other basic dc-dc converter. A 5 kW~20 kHz prototype which uses IGBT (insulated gate bipolar transistor) is made. The effectiveness of the proposed converter is confirmed by the experimental results.

In order to realize a simple topology, high efficiency, high frequency, low voltage stress, easy to control soft switching three phase inverter, a novel resonant pole three phase soft switching PWM inverter is presented in the paper. It avoids the bulk capacitor of the auxiliary resonant commutated pole inverter (ARCPI) and no center tap potential variation problem of ARCPI, the inverter possessed the advantages of the decoupled resonation of each phase, and it was easy to implement the various control schemes. The operation principle of one phase circuit has been analyzed and the equivalent circuits at different and optimum circuit were designed. The simulation and experimental results prove that it realizes soft switching of the main switches and the auxiliary switches and possesses the small power auxiliary circuit and full PWM capability. It is of great significance to reduce electro management interference (EMI) and improve efficiency.