A new generic family of saturable reactor-assisted soft-switching PWM DC-DC converters for high-power density distributed power systems

A generic family of high power density DC-DC power converter topologies with high-frequency AC link and without transformer isolation link is described. A saturable reactor assisted (SRA) soft switching mode constant frequency pulse width modulation (PWM) technique efficiently operates at a zero voltage switching transition scheme. This kind of quasi-trapezoidal wave mode PWM DC-DC power converter incorporates a small saturable reactor or a few saturable reactors in order to achieve efficient soft switching commutated operation. The use of the converter family results in much higher switching operation with a high efficiency and a quick control response. A simple forward/flyback hybrid type SRA asymmetrical PWM soft switching DC-DC power converter with high frequency link, which is included in one of the SRA soft switched PWM converter topologies, is demonstrated and theoretically analyzed in steady-state operation. Key experimental results are shown and discussed using a 150 W, 200 kHz MOSFET power converter breadboard implementation.<>