Passive infrared switch
OwnerMichael Ostrovsky, Paul Soccoli +2inventors
InventorsMichael Ostrovsky, Paul Soccoli, Alfred Lombardi, John Libretto
Life of this patent
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Abstract
A passive infrared (PIR) wall switch is operable in a two-wire circuit to control power to a load. The PIR wall switch can include one or more PIR sensors with a low current two stage amplifier-filter. The PIR sensor(s) monitor infrared (IR) radiation. The amplifier can provide a pulse signal when an IR radiation level has changed. Power for control circuitry of the PIR switch may be derived from a ground leakage type power supply, which can supply phase line wire leakage current to ground of less than 0.5 milliampere.
Claims7
A passive infrared switch for use in a two wire system comprising:
- a relay switch coupled to control the flow of power to a load;
- a passive infrared control circuit coupled to operate the relay switch upon detecting a change of infrared radiation;
- and
- a power supply coupled to supply a current not greater than 0.5 milliampere to the passive infrared control circuit.
A method of providing power to a passive infrared switch comprising:
- coupling an output of a ground leakage type power supply to a passive infrared control circuit;
- limiting a ground current to the passive infrared control circuit to no greater than 0.5 milliampere;
- controlling supply of alternating current to a load through a relay switch;
- and
- operating the relay switch upon detecting a change of infrared radiation.
Dependencies are inferred from the claim text.