Oil burner primary control for interrupted ignition system

Details Oil burner primary control for interrupted ignition system Oil burner primary control for interrupted ignition system

1979-03-05

1980-12-30

Hix, L. T.

Combustion

Timer, programmer, retarder or condition responsive control

Shutdown by sensed absence of flame in proving period

431 79, 307117, F23N 508

Patent

active

042420814

ABSTRACT:
An oil burner primary control in an interrupted ignition burner control system includes a miniature coupling transformer for controlling operation of the igniter. The gate circuit of a flame responsive switch is effective, in the absence of a burner flame, to generate a plurality of gating pulses at a frequency substantially greater than line frequency. The flame responsive switch is cyclically gated on by the pulses for energizing a safety switch resistance heater. The primary winding of the coupling transformer is connected in the gate circuit of the flame responsive switch and is responsive to the gating pulses to induce voltage pulses in its secondary winding which is connected in the gate circuit of an ignition switch controlling the igniter. At least one of the pulses occurs sufficiently early in each half cycle of the sine wave alternating current appearing at the ignition switch so that the ignition switch conducts during essentially all of the sine wave, as long as there is no burner flame. When burner flame appears, the pulses are terminated, de-energizing the safety switch resistance heater and the igniter.

REFERENCES:
patent: 3732433 (1973-05-01), Lourigan
patent: 3947219 (1976-03-01), Santo
patent: 3975136 (1976-08-01), Baysinger

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