Patent ID: 7095630
Filing Date: 2006-08-22
Classification: H02M,Y02B

Abstract:
1. A power supply, comprising: a supply inductor coupled to a first capacitor to form a first resonant circuit for generating a resonant waveform in a resonant operation, during a first portion of an operation cycle of said power supply; a charge storage element for developing an output voltage to energize a load; a rectifier coupled to said charge storage element and to said first resonant circuit and responsive to said resonant waveform for producing a first change of state in said rectifier, in accordance with said resonant waveform, at an end time of said operation cycle first portion, that causes said output voltage to be coupled back to said first resonant circuit and to interrupt said resonant operation; a first sensor for sensing when said first change of state in said rectifier occurs; a source of a supply current coupled to said rectifier and rectified in said rectifier to produce a rectified current that is coupled to said charge storage element to replenish a charge therein, during a second portion of said operation cycle; and a switching transistor responsive to an output signal of said first sensor for coupling said supply current to said rectifier, after said first change of state in said rectifier occurs, and for decoupling said supply current from said rectifier, prior to an occurrence of said first change of state in said rectifier.