Patent ID: 6580259
Filing Date: 2003-06-17
Classification: H02M,Y02B,Y02P

Abstract:
A power converter apparatus, comprising:a pair of input terminals for connection to a pulsating DC source; a boost unit with at least a first inductor, a first switch, a first rectifier and a first capacitor which is coupled to the input terminals and produce a voltage higher than the voltage at said input terminals; means to couple the high voltage of said boost unit to a second switch and a third switch connected in series which produce a series of voltage pulses feeding into the primary side of a transformer through a second inductor and a second capacitor connected in series; at least one secondary winding coupled to said transformer and this secondary winding is coupled to a set of rectifier and filter configuration for feeding power to an output load; a first chain of components consisting of at least a third resonant inductor, a third resonant capacitor and a second diode, which is coupled to a node joining said first switch and first diode in said boost unit and another node joining said second and third switches; a second chain of components consisting of at least a fourth resonant inductor and a third diode which is coupled to said third resonant capacitor in said first chain and a node attached to the high voltage source generated by said boost unit; means to synchronize all the switches so that resonant current flows in said first and second chain such that the switches can be turned on and off while voltages across them are essentially zero.