Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-12-08
2000-12-19
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340661, 340662, 340663, 340648, 340635, 364565, G08B 2100
Patent
active
06163266&
ABSTRACT:
For use with a DC fan, a detection circuit and a method of detecting an operational condition thereof. In one embodiment, the detection circuit includes: (1) a sensor, coupled to the DC fan, that senses a current through the sensorless DC fan and produces an intermediate signal based thereon and (2) an alarm circuit, coupled to the sensor, that compares the intermediate signal to a range defined by an upper limit signal and a lower limit signal and generates an alarm signal when the intermediate signal is outside of the range.
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Fasullo Greg H.
He Jin
Jorgenson Greg P.
Lee Victor K.
Hofsass Jeffery A.
Lucent Technologies - Inc.
Nguyen Tai T.
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