input power source in a substantially lossless manner during the on time of the reset switch the inductor lzvs also provides an energy source to assist in reducing voltage associated with turn on of the reset switch the diode dp 1 clamps the node to ground and also allows transfer to the clamp capacitor of the excess energy in l zvs associated with the primary to reset transition in this transition the body diode of qreset resonantly couples energy from l zvs to the clamp capacitor the essential operation of the circuit is retained if active switches are substituted for one or both of the diodes dp 1 and dp 2 the remaining circuit elements in fig2 correspond functionally to similarly identified elements in fig1 in fig3 is shown a schematic diagram of an embodiment of the invention for an active clamp power converter 300 utilizing an n channel mosfet for the primary switch qpri and a p channel mosfet for the reset switch qreset including an active clamp resonant transition system 310 using a p channel mosfet for the reset switch allows its source to be grounded simplifying its gate drive arrangement in a practical circuit the inductor l zvs provides an energy source to achieve zvs for the reset to primary switching transition or reduced turn on voltage the diode dp 2 clamps the node coupling the inductor lzvs and the primary of the power transformer t 1 utilizing a capacitor csnubber a circuit element shown on fig3 as a resistor rbalance removes excess charge accumulated in the capacitor csnubber during the reset to primary transition and transfers this charge to the clamp capacitor with only modest power loss other circuit elements can be substituted for.