Circuit arrangement for flame detection

Details Circuit arrangement for flame detection Circuit arrangement for flame detection

1994-07-25

1997-02-04

Price, Carl D.

Combustion

With indicator or inspection means

431 24, 431 25, 431 78, F23N 512

Patent

active

055991807

ABSTRACT:
A circuit arrangement for flame detection for a transistor coil ignition system of a burner is disclosed. The transistor coil ignition system features a trigger stage which triggers a power transistor that is located in the power circuit of the primary winding of an ignition coil in order to charge the primary winding of the ignition coil with a charging current from a power supply. A circuit arrangement includes a switch having an ignition position and a flame detection position which in the flame detection position restricts the charging current flowing via the primary winding of the ignition coil to an intensity that lies below the charging current intensity needed to generate an ignition spark in the ignition position, so that ignition spark-over cannot take place without a flame. An analysis circuit analyzes the signal from the primary winding of the ignition coil that is generated after the charging current flowing via the primary winding of the ignition coil, in which case said signal has pulse peaks when there is no flame and has no such pulse peaks when the flame is present. The analysis is preferably performed on a display signal that is present at a display device in order to indicate the presence or absence of a flame in the burner.

REFERENCES:
patent: 4167767 (1979-09-01), Courier de Mere

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