Burner ignition system

H - Electricity – 01 – T

Patent

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317/5.95

H01T 15/00 (2006.01) F23Q 3/00 (2006.01)

Patent

CA 1046134

BURNER IGNITION SYSTEM ABSTRACT OF THE DISCLOSURE A burner ignition circuit produces high frequency sparks between a pair of spaced electrodes connected to opposite sides of a secondary winding of a transformer in response to the repetitive discharge of a capacitor through the primary winding under the control of an SCR powered by a full wave rectifier such that sparks are produced throughout both half waves of AC power. The discharge capacitor is primarily charged from the power supply through a current limiting resistor. The turn-on time of the SCR is minimized by a trigger circuit including a diac which discharges another capacitor into the gate of the SCR when the voltage there- across exceeds a selected value. Circuitry including a diode connected be- tween the capacitor and the primary winding is provided to prevent LC oscillation between the discharge capacitor and the primary winding of undesirable residual energy stored in the inductance of the primary winding immediately following each turn-off of the SCR. In one embodiment, the diode is connected to the capacitor through the current limiting resistor and this undesirable oscillating energy is used to provide a further source of charging current for the discharge capacitor. In another embodiment, a diode and resistor are connected in a closed loop with the primary winding, and the residual energy is dissipated by the resistor.

229810

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