Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1980-12-10
1982-12-07
Rubinson, G. Z.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
320 21, H02J 906, H02J 704
Patent
active
043629512
ABSTRACT:
Disclosed is a standby power supply system appropriate to supply a set of signal amplifiers within a cable television network. The standby power supply normally operates off of utility company power and alternatively operates from a battery power supply during power failures. Circuitry is disclosed to use battery power during failure mode operation to generate a pulse width modulated alternating current of substantially constant true rms voltage and of substantially constant frequency. Circuitry is also disclosed to cycle charge the battery supply to a desired voltage and then stop the charging cycle and begin timing normal mode operation until another charging cycle. Further, isolating circuitry is disclosed to remove much of the load on the battery supply during normal mode operation. Various safety provisions including soft start provisions, a high current cut off, a low voltage cut off, and protection for the amplification stages is included. Finally, various types of status monitoring equipment are disclosed.
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Cheshier Donald G.
Gray James C.
McNeal Donald J.
Turner Charles S.
Cantrell Thomas L.
Control Technology
Dywer James L.
Rubinson G. Z.
Schley Joseph H.
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