Flame protection circuit

Details Flame protection circuit Flame protection circuit

1985-03-29

1987-06-09

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340577, 431 25, G01M 2700, F23N 2300, G06G 712

Patent

active

046723242

ABSTRACT:
A flame control circuit becomes a flame protection circuit when the whole circuit is also controlled with respect to correct operation. A final output signal 32, "presence of flame", is supplied only if a flame 6 is present and the circuit operates correctly. In any other case, in which parts of the circuit operate incorrectly, independently of the presence or absence of the flame, the output signal "absence of flame" is supplied. The circuit utilizes the rectifying effect of a flame on an alternating voltage applied to a measuring probe 2 in the flame, and the measuring direct voltage thus obtained, taken with an alternating voltage as a reference and applied to correctly polarized phase detection circuits 28, 42 produces the final output signal.

REFERENCES:
patent: 4300099 (1981-11-01), Maruyama
patent: 4527125 (1985-07-01), Miyanaka et al.

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