OCCUPANCY SENSOR
First Claim
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1. An occupancy sensor including:
- a sensing probe to detect occupancy of a space monitored by the sensor and produce a corresponding sensing signal,a comparator including a voltage divider defining a comparison value against which said sensing signal is compared to detect said occupancy,a voltage sensing means to sense a feed voltage applied to the sensor, wherein changes in said feed voltage induce a change in said comparison value,said voltage divider including at least one resistor selectively switchable to counter changes induced in said comparison value by changes in said feed voltage.
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Abstract
An occupancy sensor with the following components is disclosed: a sensing probe to detect occupancy of a space monitored by the sensor and to produce a corresponding sensing signal; a comparator, including a voltage divider defining a comparison value, against which the sensing signal is compared to detect occupancy; and a voltage sensing means to sense a feed voltage applied to the sensor, where changes in the feed voltage to the sensor induce a change in the comparison value.
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17 Claims
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1. An occupancy sensor including:
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a sensing probe to detect occupancy of a space monitored by the sensor and produce a corresponding sensing signal, a comparator including a voltage divider defining a comparison value against which said sensing signal is compared to detect said occupancy, a voltage sensing means to sense a feed voltage applied to the sensor, wherein changes in said feed voltage induce a change in said comparison value, said voltage divider including at least one resistor selectively switchable to counter changes induced in said comparison value by changes in said feed voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification