Flame sense circuit and method with analog output

Details Flame sense circuit and method with analog output Flame sense circuit and method with analog output

2006-01-10

2006-01-10

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S595000, C340S596000, C340S600000, C341S017000, C341S025000, C341S079000

Reexamination Certificate

active

06985080

ABSTRACT:
An analog flame sense circuit is provided that utilizes the flame rectification method of sensing flame. The circuit uses an AC voltage source and discrete components to provide the sensing of the flame current. Either a single-pole or a two-pole filter may be used to smooth the generated sense voltage. A DC bias is provided to the filter to ensure a positive voltage. The circuit also includes a high-gain, high-impedance amplifier to translate the high impedance voltage of the sensing portion of the circuit to a relatively low impedance voltage for use by an electronic control circuit. In one embodiment, a high-gain emitter-follower amplifier constructed from two bi-polar junction transistors (BJTs) is used. An integrated Darlington configuration may be used, as well as a single BJT having a high gain, and an integrated operational amplifier.

REFERENCES:
patent: 4689006 (1987-08-01), Gann
patent: 5439374 (1995-08-01), Jamieson
patent: 5472336 (1995-12-01), Adams et al.
patent: 5577905 (1996-11-01), Momber et al.

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