Patent ID: 8576016

Claim:
A power oscillator for an electronic induction heater driver, the power oscillator comprising: an H-bridge circuit comprising high-side and low-side semiconductor switches, the H-bridge circuit additionally comprising: a resonant tank circuit electrically connected between legs of the H-bridge in the topological location of a conventional H-bridge load, the resonant tank circuit comprising an induction heater coil, having first and second ends and configured to be able to inductively heat a fuel injector; first and second leg inductors, each electrically in series with an adjacent high-side switch and low-side switch within the H-bridge; wherein the H-bridge circuit forms a self-sustaining oscillator generating a sine wave signal, and wherein the H-bridge circuit is configured to provide current to the first end of induction heater coil during a first half of the sine wave generated by the H-bridge circuit and provide current to the second end of the induction heater coil during a second half of the sine wave, wherein the H-bridge switch timing being determined by a resonant frequency of the resonant tank circuit.