Three-Phase/Level, Zero Voltage and Zero Current, Phase Shift PWM DC-DC Converter for High Power Application

A new three-phase, three-level (TPTL) DC-DC phase shift PWM converter is proposed for high power and high input voltage applications. Output voltage is controlled by incorporating phase shift PWM. Clocked gate signals of each leg are phase shifted by 2pi/3 from each other. Major features of the converter include: 1) in each leg the outer two switches are turned on and off as ZVS. 2) inner two switches of each leg are turned on and off as ZCS 3) This is achieved without involving any extra passive or active components. The secondary of rectifier is of center tapped full-wave current tripler type. This results in an increase of ripple frequency by a factor of six, leading to a significant reduction in size of the output filter. In order to obtain behavioral and performance characteristics of converter topology detailed simulation studies are carried out, finally the viability of the scheme is confirmed through detailed experimental studies on a laboratory prototype developed for the purpose