Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1987-02-13
1988-10-18
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 64, 363132, H02J 700, H02M 7538
Patent
active
047790075
ABSTRACT:
A power supply system for providing uninterrupted AC power includes a first input port to which to couple AC input power at a specified RMS voltage level from a primary power source, a second input port to which to couple DC input power at a specified voltage level from a backup power source, and an output port to which to connect a device to be powered. A fullwave rectifier generates a first direct current from the AC input power, and up-converter generates a second direct current from the DC input power at an RMS voltage level approximately equal to that of the AC input power, and a switching arrangement couples a selected one of the first and second direct currents to the output port according to whether the AC input power is stabilized or interrupted, so that the flow of current to the output port is periodically reversed thereby generate AC output power. Switching may by synchronized with each zero crossing of the AC input power. A microprocessor in one form of the invention generates a reference waveform, compares it to the waveform of the AC input power, and selects one of the first and second direct currents according to whether the AC input power is interrupted or stabilized.
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Nakano Donald K.
Schlanger Steven E.
Schlanger William J.
Vurpillat Victor V.
Hanson Loyal M.
Logan Sharon D.
Shoop Jr. William M.
Unison Technologies, Inc.
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