Low voltage motion sensor for activating a high voltage load
First Claim
1. In a motion sensor for detecting the presence or absence of motion and providing an activating signal, an improvement for providing ON and OFF signals on ON and OFF lines to a relay controlling power to a load, comprising:
- a first pulse generator, having an input coupled to receive said activating signal and an output coupled to said ON line, for producing a pulse output to said ON line responsive to a first state of said activating signal;
a second pulse generator, having an input coupled to receive said activating signal and an output coupled to said OFF line, for producing a pulse on said OFF line responsive to a second state of said activating signal; and
means, coupled to said outputs of said first and second pulse generators for isolating a power supply for said motion sensor from said ON and OFF lines during said pulses.
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Accused Products
Abstract
The present invention utilizes a latching relay having on and off inputs for controlling power to a load. The on and off inputs of the relay are controlled by pulse generators which are in turn controlled by an occupancy sensor circuit. These pulse generators provide pulses when movement is initially detected in a room and when no movement has been detected for a predetermined time, respectively. The outputs of the pulse generators are coupled to an isolation circuit which isolates the power supply for the occupancy sensor from the pulses during each pulse to prevent damage to the power supply.
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Citations
12 Claims
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1. In a motion sensor for detecting the presence or absence of motion and providing an activating signal, an improvement for providing ON and OFF signals on ON and OFF lines to a relay controlling power to a load, comprising:
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a first pulse generator, having an input coupled to receive said activating signal and an output coupled to said ON line, for producing a pulse output to said ON line responsive to a first state of said activating signal; a second pulse generator, having an input coupled to receive said activating signal and an output coupled to said OFF line, for producing a pulse on said OFF line responsive to a second state of said activating signal; and means, coupled to said outputs of said first and second pulse generators for isolating a power supply for said motion sensor from said ON and OFF lines during said pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. In a motion sensor for detecting the presence or absence of motion and providing an activating signal, an improvement for providing ON and OFF signals on ON and OFF lines to a relay controlling power to a load, comprising:
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a first pulse generator, having an input coupled to receive said activating signal, for producing a pulse output responsive to a first state of said activating signal; a first driver consisting of a Darlington pair of transistors coupling an output of said first pulse generator to said ON line; a second pulse generator having an input coupled to receive said activating signal for producing a pulse responsive to a second state of said activating signal; a second driver consisting of a second Darlington pair of transistors coupling an output of said second pulse generator to said OFF line; first and second diodes having anodes coupled to said ON and OFF lines, respectively, and cathodes coupled together; a power supply for said motion sensor; an isolating transistor having one electrode coupled to said cathodes of said first and second diodes, a second electrode coupled to an input of said power supply and a control electrode coupled to said outputs of said first and second puIse generators; and a capacitor coupled to said input of said power supply. - View Dependent Claims (9)
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11. An apparatus for controlling power to a load coupled between hot and neutral lines of an AC line source responsive to sensed motion or absence of motion, comprising:
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a latching relay coupled between one of said hot and neutral lines and said load and having 0N and OFF inputs coupled to first and second activating coils for switching said relay ON and OFF, respectively; a transformer having a primary winding coupled to one of said hot and neutral lines and a secondary winding coupled at one end to a DC ground line; a rectifier coupled to a second end of said secondary winding of said transformer, an output of said rectifier being coupled to an end of said first and second relay coils opposite said ON and OFF lines; and a motion sensor including a transmitter for generating ultrasonic waves, a receiver for receiving said ultrasonic waves, a processing circuit coupled to said receiver for detecting the presence or absence of a doppler shift of said ultrasonic waves, a first pulse generator coupled between an output of said processing circuit and said ON line, and a second pulse generator coupled between said output of said processing circuit and said OFF line. - View Dependent Claims (12)
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Specification