Combustion – Heated line section feeds flame holder – Unheated oxidizer supply to line between heated section and...
Patent
1974-06-20
1976-04-06
Truhe, Joseph V.
Combustion
Heated line section feeds flame holder
Unheated oxidizer supply to line between heated section and...
431264, F23Q 300
Patent
active
039492737
ABSTRACT:
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 thereacross exceeds a selected value. Circuitry including a diode connected between 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.
REFERENCES:
patent: 3369151 (1968-02-01), Minks
patent: 3510725 (1970-05-01), Tyler
patent: 3556706 (1971-01-01), Campbell
patent: 3681001 (1972-08-01), Potts
patent: 3710192 (1973-01-01), Budlane
patent: 3849670 (1974-11-01), Lourigan
Shaw Clifford C.
Sundstrand Corporation
Truhe Joseph V.
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