Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Patent
1991-07-17
1994-05-17
Wieder, Kenneth A.
Electricity: measuring and testing
Electric lamp or discharge device
Electric lamp
324 98, 324105, 324721, 340661, G01R 3100, G01R 1702, G01R 144
Patent
active
053131657
ABSTRACT:
An apparatus for monitoring current through a lamp circuit that uses a series resistance shunt in the circuit with one end connected to a current source and the second end connected to the lamp. The apparatus includes a comparator that is connected across the shunt and has a threshold switching voltage wherein a voltage across the shunt that is larger than the threshold switching voltage will switch the comparator on and a voltage across the shunt that is smaller than the threshold switching voltage will switch the comparator off. A biasing circuit, connected to and controlling the comparator, temperature compensates the threshold switching voltage such that the threshold switching voltage changes proportionally to absolute temperature and controls a sensitivity of the threshold switching voltage to changes in a supply voltage of the circuit. In a preferred embodiment, the shunt is a portion of the printed board trace. Also in a preferred embodiment, the apparatus has a 50% sensitivity to changes in supply voltage.
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Analog Devices Inc.
Brown Glenn W.
Wieder Kenneth A.
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