Patent ID: 7787265

Claim:
A power converter comprising: a transformer having first and second serially-connected primary windings both wound in the same direction and a secondary winding, with the second end of said second primary winding connected to the first end of said first primary winding; a primary circuit for coupling an input voltage generated by an input source to said first primary winding and including first and second switches periodically biased conducting for coupling said input voltage to said first primary winding, with said first switch biased by a periodic pulse waveform generated from a controller capable of pulsewidth modulation, and said second switch biased by voltage induced across said second primary winding through magnetic coupling of voltage across said first primary winding; and first and second magnetization current paths being tapped respectively from said first and second ends of said first primary winding to return magnetization current to said input source only when said switches are biased non-conducting; and a secondary circuit for coupling the voltage induced across said secondary winding to an output and including a rectifier and a low-pass filter.