Patent ID: 6751104
Filing Date: 2004-06-15
Classification: H02M,Y02B,Y02P

Abstract:
An AC-to-DC converter coupled to an AC source comprising:a rectifier bridge having an input coupled to said AC source and having an output; an input inductor coupled to said output of said rectifier stage; an auxiliary branch comprised of an auxiliary transformer winding of the output transformer coupled to said input inductor, said auxiliary transformer winding being characterized by a first number of turns and a auxiliary diode in series with the auxiliary transformer winding; a primary branch in parallel with the auxiliary branch and comprised of a primary diode coupled to said input inductor; a storage capacitor coupled to said auxiliary winding through the auxiliary diode; a primary of an output transformer, said primary being characterized by a second number of turns; and a first switch coupled in series with said primary of said output transformer; said first switch and primary being coupled in parallel with said storage capacitor to said auxiliary winding through the auxiliary diode, wherein said first number of turns is not equal to said second number of turns so that voltage across said storage capacitor is reduced without sacrificing load carrying capacity of said AC-to-DC converter.