Very low current microcontroller operated motion sensor
First Claim
1. A low power, low leakage current type switching circuit for delivering AC electrical power to a load from an AC power supply having only a hot lead, a neutral lead and a ground connection, comprising:
- a. a rectifier means, 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;
b. a relay means having first and second normally open contacts, with the first normally open contact being coupled to the hot lead and the second normally open contact being coupled to the load, and a storage capacitor means, coupled to the DC electrical power supply, for storing electrical power to actuate the relay means;
c. an occupancy sensor means, coupled to the DC electrical power supply, for generating a signal in response to a detected human presence;
d. a digital microcontroller means, coupled to the DC electrical power supply, the relay means and the occupancy sensor, for controlling operation of the relay means to selectively deliver electrical power to the load.
1 Assignment
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Accused Products
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.
67 Citations
22 Claims
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1. A low power, low leakage current type switching circuit for delivering AC electrical power to a load from an AC power supply having only a hot lead, a neutral lead and a ground connection, comprising:
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a. a rectifier means, 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; b. a relay means having first and second normally open contacts, with the first normally open contact being coupled to the hot lead and the second normally open contact being coupled to the load, and a storage capacitor means, coupled to the DC electrical power supply, for storing electrical power to actuate the relay means; c. an occupancy sensor means, coupled to the DC electrical power supply, for generating a signal in response to a detected human presence; d. a digital microcontroller means, coupled to the DC electrical power supply, the relay means and the occupancy sensor, for controlling operation of the relay means to selectively deliver electrical power to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification