A 100 kHz, 2.7 kW rectifier using a series-resonant converter bypassing discharge current

The fundamental characteristics of a newly developed series-resonant converter bypassing discharge current (SRCBDC) and of a 2.7 kW rectifier using this converter are described. The SRCBDC has significant advantages over conventional series-resonant converters and is particularly useful for application to rectifiers. The advantages of the SRCBDC are as follows. It is possible to switch at zero current, even if f_r<2f_s (where f_r is the resonant frequency and f_s is the switching frequency); bypassing discharge current away from a transformer makes it possible to use MOSFETs as switching devices; switching frequency variation is less than that of a conventional series-resonant converter so it is possible to use IGBTs (insulated-gate bipolar transistors) as switching devices even if f_r=100 kHz