Combustion-state detecting circuit of combustion apparatus

Details Combustion-state detecting circuit of combustion apparatus Combustion-state detecting circuit of combustion apparatus

1996-11-12

1998-07-07

Dority, Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of electrical condition or temperature of electrical...

431 25, 340579, F23N 500

Patent

active

057758956

ABSTRACT:
There is disclosed a combustion-state detecting circuit of a combustion apparatus installed in a combustion chamber, including: a flame detector that has a heat-emitting device for emitting heat on application of an alternating current signal, and produces a potential difference between the current applied to the heat-emitting device and flame-electric current produced by ignition occurring within the combustion chamber; a rectifier that changes the alternating current signal provided by the flame detector into a direct current signal; an inversion amplifier that inverts the direct current signal produced by the rectifier with respect to a reference signal and increases the magnitude of the inverted signal; and a flame discriminator that compares the output signal of the inversion amplifier with a flame discriminating reference signal to determine if ignition occurs.

REFERENCES:
patent: 5049063 (1991-09-01), Kishida et al.
patent: 5073104 (1991-12-01), Kemio
patent: 5503183 (1996-04-01), Fenn et al.
patent: 5526776 (1996-06-01), Fenn et al.
patent: 5548277 (1996-08-01), Wild

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