Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate
2007-07-03
2007-07-03
Riley, Shawn (Department: 2838)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
C363S025000, C700S028000
Reexamination Certificate
active
10854043
ABSTRACT:
A power conversion apparatus, such as a UPS, includes a first waveform reference signal generator circuit operative to generate a first waveform reference signal responsive to an AC bus, and a second waveform reference signal generator circuit operative to generate a second waveform reference signal, e.g., a more consistently sinusoidal signal produced by another source. The apparatus further includes a control circuit that selectively generates a third waveform reference signal from the first and second waveform reference signals, and a power converter circuit (e.g., a rectifier and/or inverter) coupled to the AC bus and operative to transfer power to and/or from the AC bus responsive to the third waveform reference signal. In particular, the control circuit may be operative to weightedly combine the first and second waveform reference signals to generate the third waveform reference signal. The control circuit may weightedly combine the first and second waveform reference signals responsive to an operating parameter of the power converter, such as a voltage, a current, a power factor, a source impedance, a voltage distortion and/or a harmonic input current.
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Taimela Pasi S.
VanEyll Kevin L.
Eaton Power Quality Corporation
Myers Bigel & Sibley Sajovec, PA
Riley Shawn
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