Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1985-12-09
1987-10-27
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 66, 307 85, 307 87, 361 90, 361 91, 361 92, 361 93, H02H 328
Patent
active
047031913
ABSTRACT:
A reserve power source, switchably connected to a network between a primary power supply and a load, provides an auxiliary power signal to the load when a power failure condition is detected in the signal from the primary power supply. The reserve power source includes a circuit for instantaneously detecting and switching upon the occurrence of a power outage. An overvoltage
oise detector circuit is included to detect when either a sustained overvoltage condition or a high, short duration overvoltage condition occurs. A low voltage detector circuit is included for detecting a low voltage, or brown-out, condition. When an overvoltage or low voltage condition is detected, a preferred embodiment of the invention switches the load to the auxiliary power signal within one-half cycle of, but in zero-crossing synchronization with, the primary power signal.
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Control Technology, Inc.
Ip Skik Luen Paul
Shoop Jr. William M.
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