Patent ID: 6594161
Filing Date: 2003-07-15
Classification: H02M,Y02B

Abstract:
A power converter comprising:an input terminal; an output terminal; a transformer having a primary side and a secondary side, said transformer further comprising a primary side winding connected to said input terminal and a secondary side winding connected to said output terminal; a primary side switch; a secondary side switch; a secondary current sense detecting a secondary current in said secondary side switch a slave control unit controlling switching of said secondary side switch; and a master control unit controlling switching of said primary side switch, said primary side switch and said secondary side switch being configured to be switched on and off alternately; wherein said switching of said secondary side switch is accomplished depending on said secondary current detected in said secondary side switch, wherein said primary side switch and said secondary side switch are switched on during a zero voltage switching condition, wherein said slave control unit further comprises a comparator and a set/reset flip flop, wherein said secondary current sense conveys an output signal into said comparator when said secondary current becomes negative, wherein said comparator compares said output signal of said secondary current sense to a current reference level and outputs a switching signal to said set/reset flip flop when said output signal of said secondary current sense exceeds said current reference level, and wherein said set/reset flip flop switches said secondary side switch when said switching signal is received.