Patent ID: 7944678
Filing Date: 2011-05-17
Classification: F23Q,H02M,Y02B

Abstract:
1. A power supply circuit for use with intermittent pilot and direct spark ignition systems for gas burners, comprising: a low voltage DC power source; a resonant circuit coupled to the power source, the resonant circuit including as an inductive element thereof a primary coil of a transformer; an electronic switching circuit coupled in series with the resonant circuit; a control circuit operatively coupled to the switching circuit to control switching thereof, the control circuit utilizing a low duty cycle control signal to control switching of the switching circuit; and wherein the transformer includes a first secondary coil coupled to a flame sense electrode and flame sense circuit; and wherein the transformer includes a second secondary coil coupled through a voltage doubler circuit to a spark capacitor in parallel with a primary coil of a step-up transformer and trigger circuit, the secondary coil of the step-up transformer being coupled to a spark electrode.