Control-loop modeling of the controllable ZVS PWM forward converters usingsaturable magnetic cores

Employing a saturable core in the development of zero-voltage-switching (ZV S) technique has attracted widespread attention [1]-[8], However these anal yses are focused on the discussions of the uncontrollable ZVS pulsewidth mo dulation (PWM) converters. In this paper, the characteristics after the add ition of the control circuits to the ZVS saturable-core PWM converters will be considered. The small-signal models of the controllable ZVS saturable-c ore PWM converters will also be proposed, Furthermore, a proper compensatio n strategy is offered to achieve a stable and satisfactory dynamic response . Self-excited ZVS PWM resonant regulators with the control scheme are even tually implemented to verify theoretical derivations.