Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1986-01-17
1988-01-05
Focarino, Margaret A.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 42, 431 51, 431 58, 431 69, 431 90, F23Q 908
Patent
active
047173335
ABSTRACT:
An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.
REFERENCES:
patent: 3174533 (1965-03-01), Weber
patent: 3174534 (1965-03-01), Weber
patent: 4131413 (1978-12-01), Ryno
Advanced Mechanical Technology, Inc.
Focarino Margaret A.
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