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Ignition boost and rectification flame detection circuit

DC CAFC
  • US 6,222,719 B1
  • Filed: 07/15/1999
  • Issued: 04/24/2001
  • Est. Priority Date: 07/15/1999
  • Status: Expired due to Term
First Claim
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1. Igniter circuit for a furnace gas burner in which an igniter starts a flame in the burner, and in which pulsating current is applied to a coil in order to actuate the furnace;

  • the igniter circuit comprisinga flyback rectifier having a first electrode connected to said relay coil and a second electrode;

    charge storage means coupled to the second electrode of the flyback rectifier to accumulate a flyback voltage;

    a step-up transformer having a primary winding and a secondary winding, the secondary winding being connected to the igniter to provide a high voltage thereto; and

    switching means coupled between the first charge storage means and the primary winding of the step-up transformer for discharging the accumulated flyback voltage on said charge storage means, including a switching arrangement that automatically discharges said accumulated flyback voltage through said primary winding whenever the flyback voltage reaches a predetermined threshold.

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