Current monitoring circuit for static switch of uninterruptable

Details Current monitoring circuit for static switch of uninterruptable Current monitoring circuit for static switch of uninterruptable

1983-09-22

1986-04-15

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 87, 361 95, 361 94, H02J 700, H02J 900

Patent

active

045830045

ABSTRACT:
A circuit for monitoring the load current supplied by an uninterruptable power supply for transferring the load to a secondary source when the load current exceeds the capability of the uninterruptable power system. A signal representing the load current is simultaneously, continuously compared to a first reference level and a second reference level. The second reference level has a greater effective magnitude than the first reference level and whenever it is exceeded by the instantaneous signal the transfer is initiated. The transfer is also initiated whenever the signal uninterruptably exceeds the first reference level for a selected period of time.

REFERENCES:
patent: 3515896 (1970-06-01), Swing et al.
patent: 4099692 (1978-07-01), Kolkman
patent: 4160917 (1979-07-01), Wald
patent: 4180745 (1979-12-01), Bartlett et al.
patent: 4347541 (1982-08-01), Chen et al.
Motorola Linear Integrated Circuits, Series C Motorola, Inc. 1979, pp. 6-125 to 6-130.

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