Patent ID: 6760236
Filing Date: 2004-07-06
Classification: H02M

Abstract:
A third winding reset forward converter comprising:a controller; a transformer having a primary winding, a secondary winding and a third winding; a power switch in series with said transformer and coupled to an input DC source, said power switch being alternately turned on and off by said controller; an output filter connected in parallel with an output load, said output filter operated to provide a constant DC voltage to an output load; a forward switch connected in series with said secondary winding and operated to provide a forward conduction path to said output load when said power switch is turned on; a free-wheeling switch connected in parallel with said output filter and operated to provide a secondary side current path from said output filter when said power switch is turned off; a rectifier diode connected in series with between a storage capacitor and a negative end of said third winding and operated to provide a forward conduction path to said output filter when said power switch is turned off; a storage inductor connected in series with said output filter; an auxiliary switch connected in series between said storage capacitor and said output filter and being operated to provide a forward a conduction path to said output filter when said power switch is turned off; and a free-wheeling diode connected to said storage inductor and said auxiliary switch and being operated to provide a reset current path from said storage inductor to said output load when said power switch is turned on and said auxiliary switch is turned off.