H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/94 (2006.01) G01P 13/00 (2006.01) G11B 23/00 (2006.01) H05B 37/02 (2006.01)
Patent
CA 2242088
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.
Finlayson & Singlehurst
Hubbell Incorporated
LandOfFree
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