Passive infrared motion detection circuit having four comparator

Details Passive infrared motion detection circuit having four comparator Passive infrared motion detection circuit having four comparator

1997-11-10

1999-03-23

Tong, Nina

Communications: electrical

Condition responsive indicating system

Specific condition

340567, 250221, 250342, 250353, G08B 1300

Patent

active

058866329

ABSTRACT:
A simplified analog passive infrared motion detection circuit operates using only four operational amplifiers. A first amplifier is used as part of a bandpass amplifier circuit, a second is used in an inverter circuit, a third is used in an integrator circuit and a fourth is used in a threshold comparator circuit for generating an alarm output signal. The circuit is built using a single quad op amp IC package and is economical to manufacture. The third op amp can alternatively be used as a passive infrared sensor preamplifier and a transistor can be used in the integrator circuit, so that a regulated power supply for the circuit is not needed.

REFERENCES:
patent: 4346427 (1982-08-01), Blissett et al.
patent: 4364030 (1982-12-01), Rossin
patent: 4851681 (1989-07-01), DePauli
patent: 4943712 (1990-07-01), Wilder
patent: 5077549 (1991-12-01), Hershkovitz et al.
patent: 5309147 (1994-05-01), Lee et al.
patent: 5486810 (1996-01-01), Schwarz
patent: 5670943 (1997-09-01), Dipoala et al.

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