Patent ID: 6853568

Claim:
An isolated voltage regulator, comprising: an integrated magnetic device for performing both transformer and output choke filter function, comprising: a first transformer having a first primary winding and a first secondary winding; a second transformer having a second primary winding and a second secondary winding; a first choke filter having one end coupled to a first terminal of said first secondary winding; and a second choke filter having one end coupled to a first terminal of said second secondary winding, and the other end of said second choke filter coupled to the other end of said first choke filter to form the output terminal of said isolated voltage regulator; a first switch having a first electrode connected to said first terminal of said first secondary winding, and a second electrode connected to ground; a second switch having a first electrode connected to a second terminal of said first secondary winding, and a second electrode connected to ground; a third switch having a first electrode connected to said first terminal of said second secondary winding, and a second electrode connected to ground; and a fourth switch having a first electrode connected to a second terminal of said second secondary winding, and a second electrode connected to ground; wherein said first transformer, said first choke filter, said first switch and said second switch form a first channel, and said second transformer, said second choke filter, said third switch and said fourth switch form a second channel, and the phase difference between said first channel and said second channel is 180°; and wherein said first secondary winding, said first choke filter, said first switch and said second switch form a first buck rectifier circuit, and said second secondary winding, said second choke filter, said third switch and said fourth switch form a second buck rectifier circuit, and said isolated voltage regulator is an interleaved synchronous buck converter thereby.