Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1988-07-06
1989-05-30
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 86, 361 87, 361 91, 361101, 363 63, H02H 328
Patent
active
048356522
ABSTRACT:
A bi-directional DC power controller is provided with a bi-directional DC switch connected between a pair of terminals for connection to a pair of line power conductors. A first difference amplifier is connected to receive voltages at these terminals and to produce an output voltage signal which is proportional to the difference in voltages between these terminals when the voltage at one of the terminals is greater than the voltage at the other terminal, and is constant when the voltage at the second terminal is greater than the voltage at the first terminal. A second differential amplifier also receives voltage signals from these terminals and produces an output voltage signal which is proportional to the difference in voltages between the terminals when the voltage at the second terminal is greater than the voltage at the first terminal, and which is constant when the voltage at the first terminal is greater than the voltage at the second terminal. The outputs of the difference amplifiers are combined to produce a control voltage signal having a magnitude that is proportional to the absolute value of the difference between voltages at the terminals. This control signal is used to control the operation of the bi-directional DC switch.
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Billings William W.
Fox David A.
Lenart R. P.
Pellinen A. D.
Westinghouse Electric Corp.
Williams H. L.
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