Patent ID: 8576018

Claim:
A synchronized array bridge power oscillator for an electronic induction heater driver, the synchronized array bridge 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, 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, 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; a plurality of induction heater coils, each induction heater coil being coupled to a corresponding one of the plurality of half-bridge circuits and configured to inductively heat a corresponding fuel injector; at least one energy replenishment inductor coupled to the resonant tank circuit and to the each of the plurality of half-bridge circuits, the energy replenishment inductor configured to supply energy to the resonant tank circuit and the plurality of half-bridge circuits; wherein the H-bridge circuit, the half-bridge circuits, and energy replenishment inductor are configured to provide current to a first end of the tank circuit inductor and first end of the induction heater coils during a first half of a sine wave and provide current to an opposite second end of the tank circuit and opposite ends of the induction heater coils during a second half of the sine wave; and wherein half-bridge switch timing is determined by a synchronized frequency of resonant tank circuits in the H-bridge circuit and the half-bridge circuits.