Patent ID: 6535407
Filing Date: 2003-03-18
Classification: H02M,Y02B

Abstract:
A DC/DC converter comprising:a switch for converting a DC voltage into an AC voltage; a piezoelectric transformer for changing said AC voltage from an input waveform with any duty into an output sinusoidal waveform with a 50% duty in which a time ratio of positive and negative half cycles are identical; and a current doubler (Double Ended Converter using Two Inductors) type rectification-smoothing circuit that receives the output sinusoidal waveform from the piezoelectric transformer and outputs zero-ripple current, wherein said rectification-smoothing circuit includes a first FET (field effect transistor), a second FET, a first inductor, a second inductor, and a capacitor, so that said first FET has a gate terminal connected via a first waveform rectification circuit to one output terminal of said piezoelectric transformer, said second FET has a gate terminal connected via a second waveform rectification circuit to the other output terminal of said piezoelectric transformer, and rectification is carried out by using said first FET and said second FET.