Very low current microcontroller operated motion sensor

Details Very low current microcontroller operated motion sensor Very low current microcontroller operated motion sensor

1997-07-03

1999-11-16

Gordon, Paul P.

Boots, shoes, and leggings

3645283, 307116, 361179, H01H 3500

Patent

active

059845139

ABSTRACT:
A multivoltage (120 VAC to 277 VAC) input, low leakage current type, microcontroller-based, wall switch mounted, IR motion sensor with a latching relay having zero watt load switching capability, provided in a low cost, single PC board design to be mounted in a single gang electrical box. The switching circuit delivers AC electrical power to a load, such as a lighting fixture, from an AC power supply having only a hot lead, a neutral lead and a ground connection. The switching circuit comprises a rectifier, coupled to conduct a leakage current between the hot lead and the ground connection, for converting the AC electrical power to a DC electrical power supply. A relay has a first normally open contact coupled to the hot lead and a second normally open contact coupled to the load, and is powered by a storage capacitor. An IR occupancy sensor generates a signal in response to a detected human presence. A digital microcontroller is coupled to the DC electrical power supply, the relay, and the occupancy sensor, and controls operation of the relay to selectively deliver electrical power to the load. The switching circuit also includes a power monitor section, a power reset section, a power relay section for operating the relay switch, an LED flash section, and a timer section.

REFERENCES:
patent: 4340826 (1982-07-01), Muchnick
patent: 4874962 (1989-10-01), Hermans
patent: 5221919 (1993-06-01), Hermans
patent: 5538181 (1996-07-01), Simmons et al.
patent: 5699243 (1997-12-01), Eckel et al.
patent: B14874962 (1995-04-01), Hermans

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