An active resonant snubber for high frequency PWM converters

An active resonant snubber circuit that provides a zero current turn-on transition and a zero voltage turn-off transition for continuous current constant frequency PWM (pulse width modulation) converters is described. The circuit avoids the series found in the primary current path of some passive LC dissipationless snubbers. The energy which otherwise would have appeared as primary switching power losses is transferred to the load via the snubber circuitry. Analysis and modeling results of the circuit are presented. A description of an experimental circuit demonstrating switching power loss reductions is also presented.<>