Zero-voltage-zero-current switching in high-output-voltagefull-bridge PWM converters using the interwinding capacitance

摘要

A novel zero-voltage and zero-current-switching (ZVZCS)nfull-bridge (FB) pulsewidth-modulated (PWM) power converter is proposed.nThe new converter uses the interwinding capacitance and a smallnprimary-side inductor to achieve a zero-current-zero-voltage turn offnand a zero-current turn on of the passive-to-active leg transistors. Thenturn off of the active-to-passive leg transistors is with zero voltage,nand the turn on is with zero voltage and zero current across them. Thenringing caused by the parasitic interwinding capacitance and by thenreverse recovery of the rectifiers is reduced. The new converter isnattractive for high-output-voltage applications (600-1000 V), where theninterwinding capacitance is sufficiently dominant. In addition, switchesnsuch as insulated gate bipolar transistors (IGBTs) and MCTs can be usednat higher frequencies which is particularly desirable for high-powernapplication (above 2 kW). The experimental results obtained from annIGBT-based 62.5-kHz DC/DC power converter with a rated output voltage ofn600 V and a nominal power of 1.2 kW are presented