Electrical transmission or interconnection systems – Plural supply circuits or sources
Patent
1985-03-08
1987-06-09
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
307 64, 307 66, 307 85, 361 91, 323269, 363 69, H02J 100
Patent
active
046722262
ABSTRACT:
A redundant power supply/signal conditioner system for a resistance temperature detector includes power supply/signal conditioner modules having first and second output terminals connected to a resistance temperature detector. Diode circuits are connected across the output terminals of each of the power supply/signal conditioner modules to provide an alternate current path when the corresponding power supply/signal conditioner module is removed or is not conductive due to a failure. Each of the power supply/conditioner modules includes a constant current source for supplying a constant current which is slightly different in each of the modules. Each of the modules also includes an overvoltage protection circuit for preventing the voltage output by the constant current source from exceeding a predetermined value and a signal conditioner which outputs a signal based on the temperature detected by the resistance temperature detector. The resistance temperature detector is operated by a current from the module containing the constant current source which generates the highest current and all other constant current sources are controlled by a voltage across a feedback resistor to stay turned off as long as the current is supplied. When the current stops being supplied because the operating constant current source fails or is removed, the next highest voltage current source is turned on due to the drop in current across its feedback resistor and begins supplying current to the resistance temperature detector.
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Fast Over/Under Voltage Protection by Design Electronic, vol. 8, No. 4 (Jan 1971).
Ip Shik Luen Paul
Lombard R. S.
Shoop Jr. William M.
Westinghouse Electric Corp.
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