Patent ID: 6396722
Filing Date: 2002-05-28
Classification: H02M,H05B,Y02B

Abstract:
A DC to AC inverter circuit, comprising:an input voltage source; a plurality of switches arranged in a full bridge configuration wherein opposite corners of said full bridge configuration being selectively coupled to said voltage source; a transformer having a primary side and a secondary side, said primary side being selectively coupled to said voltage source in an alternating fashion through said full bridge switch configuration; a load coupled to said secondary side of said transformer; a pulse generator circuit generating a first pulse signal for driving one of the corner switches of said full bridge configuration; a feedback control loop circuit receiving a feedback signal indicative of power being supplied to the load and adapted to generate a second pulse signal for controlling the conduction state of a switch on the opposite corner of said switch being controlled by said first pulse signal, said second pulse signal having a first state which overlaps said first pulse signal to deliver an amount of power to said load determined by said feedback signal, and a second state which overlaps the first signal with a predetermined minimum overlap to deliver a predetermined minimum power to the load.