Photoelectric combustion products detector with low power...

Details Photoelectric combustion products detector with low power... Photoelectric combustion products detector with low power...

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1236196

Abstract of the Disclosure A photoelectric combustion products detector for periodically sampling the ambient air includes sampling means capacitively coupled to an AC source, so that the coupling capacitor produces at the sampling means a source current 90° out of phase with the AC source voltage, which is rectified to provide a supply volt- age. Sampling is controlled by a NAND gate having at its inputs a varying threshold level which is propor- tional to and in phase with the supply voltage. A ramp signal generator connected to one gate input terminal enables the gate when the ramp signal exceeds the vary- ing threshold level. The other input terminal of the gate is connected to a timing circuit comprising a Zener diode, a capacitor and a discharge resistor which produces a short trigger pulse at or near each positive zero crossing of the AC source voltage, the coincidence of a trigger pulse with an enabling period causing the gate to actuate the sampling means.

481825

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