Low Voltage Power Supply for Spark Igniter and Flame Sense

A power supply circuit for use with intermittent pilot and direct spark ignition systems for gas burners powered from a low voltage DC power source, comprising:

• an input filter circuit adapted to receive low voltage DC;
• a transformer having coupled in parallel with a primary coil thereof a capacitor to form a resonant circuit;
• a switching circuit operatively coupled to the resonant circuit to induce resonance therein;
• wherein the transformer includes a first secondary coil configured to power a flame sense circuit utilizing flame rectification to detect the presence of flame;
• and
• wherein the transformer includes a second secondary coil coupled to a spark capacitor, the spark capacitor being coupled to a primary coil of a step-up transformer and trigger circuit, the secondary coil of the step-up transformer configured to drive a spark electrode of an intermittent pilot or direct spark ignition system.

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 secondary coil coupled to a flame sense electrode and flame sense circuit and 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.