Power conversion apparatus and methods using an adaptive waveform reference
First Claim
1. A power conversion apparatus, comprising:
- a first waveform reference signal generator circuit operative to generate a first waveform reference signal responsive to an AC bus;
a second waveform reference signal generator circuit operative to generate a second waveform reference signal;
a control circuit that selectively generates a third waveform reference signal from the first and second waveform reference signals; and
a power converter circuit coupled to the AC bus and operative to transfer power to and/or from the AC bus responsive to the third waveform reference signal.
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Accused Products
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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Citations
37 Claims
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1. A power conversion apparatus, comprising:
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a first waveform reference signal generator circuit operative to generate a first waveform reference signal responsive to an AC bus; a second waveform reference signal generator circuit operative to generate a second waveform reference signal; a control circuit that selectively generates a third waveform reference signal from the first and second waveform reference signals; and a power converter circuit coupled to the AC bus and operative to transfer power to and/or from the AC bus responsive to the third waveform reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power conversion apparatus, comprising:
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a waveform reference signal generator circuit operative to generate a waveform reference signal responsive to an AC voltage on an AC bus; a sinusoidal signal generator circuit operative to generate a sinusoidal reference signal synchronized to the AC voltage; a control circuit operative to weightedly combine the waveform reference signal and the sinusoidal reference signal to generate a composite waveform reference signal; and a power converter circuit coupled to the AC bus and operative to transfer power to and/or from the AC bus responsive to the composite waveform reference signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An uninterrupted power supply (UPS), comprising:
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a waveform reference signal generator circuit operative to generate a waveform reference signal responsive to an AC voltage on an AC bus; a sinusoidal signal generator circuit operative to generate a sinusoidal reference signal synchronized to the AC voltage; a control circuit operative to weightedly combine the waveform reference signal and the sinusoidal reference signal to generate a composite waveform reference signal; and a power converter circuit coupled to the AC bus and operative to transfer power to and/or from the AC bus responsive to the composite waveform reference signal. - View Dependent Claims (22, 23, 24, 25)
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26. A power conversion method, comprising:
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generating a first waveform reference signal responsive to an AC bus; generating a second waveform reference signal; selectively generating a third waveform reference signal from the first and second waveform reference signals; transferring power to and/or from the AC bus responsive to the third waveform reference signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification