Patent ID: 8576019

Claim:
A synchronized array power oscillator for an electronic induction heater driver, the synchronized array power oscillator comprising: an H-bridge circuit comprising high-side and low-side semiconductor switches and a resonant tank circuit comprising a tank circuit inductor and tank circuit capacitor, the resonant tank circuit being electrically connected between legs of the H-bridge circuit via first and second leg inductors, each leg inductor being electrically in series with an adjacent high-side switch and low-side switch and connected to the tank circuit inductor, the tank circuit inductor configured to be able to inductively heat a fuel injector; a plurality of half-bridge circuits, each half-bridge circuit comprising high-side and low-side semiconductor switches and a corresponding tank circuit inductor configured to inductively heat a corresponding fuel injector, each half-bridge circuit further comprising a corresponding leg inductor connected in series with the high-side and low-side semiconductor switches of each half-bridge circuit, the plurality of half-bridge circuits being connected in parallel to the H-bridge circuit and connected in parallel to each other, adjacent pairs of half-bridge circuits forming a virtual H-bridge circuit, which is synchronized with the H-bridge circuit; wherein the H-bridge circuit and the half-bridge circuits are configured to provide current to a first end of the tank circuit inductors during a first half of a sine wave and provide current to an opposite second end of the tank circuit inductors during a second half of the sine wave; and wherein bridge switch timing is determined by a synchronized frequency of resonant tank circuits.