Power control and fault isolation indicator

Details Power control and fault isolation indicator Power control and fault isolation indicator

1988-01-19

1989-02-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 86, 361 87, 355 14C, 371 29, H02H 304

Patent

active

048035920

ABSTRACT:
A power supply system, which supplies a number of different A.C. and D.C. voltage levels to a plurality of loads, is monitored at a number of points for undervoltage, overvoltage and/or overcurrent fault conditions. A diagnostics logic circuit, which is formed from relatively inexpensive, readily available logic units, generates a BCD code signal indicating a fault in response to the occurrence of a fault condition at one of the monitored points. The system responds to this BCD fault indicating code signal by, on the one hand, protecting the power system by actuating a main relay to open the A.C. power line to the system and generating a shutdown signal applied to a pulse width modulator of a converter in the system and, on the other hand, by driving a seven-segment display which displays a numeral to indicate the location of the fault condition. In order to avoid false undervoltage fault signals while the system voltages are coming up after the system is turned on, a delay circuit is used to mask the BCD code generating portion of the diagnostics logic until the system voltages reach normal operating levels.

REFERENCES:
patent: 4133477 (1979-01-01), Marino et al.
patent: 4403213 (1983-09-01), Khamare et al.

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