Quantized voltage feed-forward a power factor correction controller
First Claim
1. A quantized voltage feed-forward device for providing a quantized voltage feed-forward signal, the device comprising:
- a plurality of comparators, each of the plurality of comparators monitoring an instantaneous input voltage signal and to compare the instantaneous input voltage with a discrete, predetermined reference voltage level, and to generate a plurality of digital state signals representative of said comparison; and
a logic control circuit that processes the digital state signals from each of the plurality of comparators at an end of each half cycle in the input voltage signal to always determine a peak in the input voltage signal and to generate a discrete voltage feed-forward factor output that is always representative of a function of the peak input voltage in that half cycle.
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Abstract
A quantized voltage feed-forward (QVFF) circuit and integrated circuits using this technique. The QVFF circuit includes a plurality of comparators in combination with a logic control circuit. The comparators are structured and arranged to establish various voltage threshold levels, each providing a digital state signal representative of the sensed input voltage level. The logic control circuit is structured and arranged to use the digital input signals from the comparators to output a voltage feed-forward factor (KVFF) signal that is representative of the V2rms voltage. Output from the logic control circuit is provided to an analog signal multiplier and used to shape an input current reference (IMO) waveform. This allows detection of changes in the rms level of the input voltage on the half-cycle of the AC line voltage, resulting in a rapid response to line voltage changes. Because the KVFF factor signal contains no AC ripple component, it does not contribute to THD of the input current reference, IMO.
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Citations
24 Claims
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1. A quantized voltage feed-forward device for providing a quantized voltage feed-forward signal, the device comprising:
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a plurality of comparators, each of the plurality of comparators monitoring an instantaneous input voltage signal and to compare the instantaneous input voltage with a discrete, predetermined reference voltage level, and to generate a plurality of digital state signals representative of said comparison; and a logic control circuit that processes the digital state signals from each of the plurality of comparators at an end of each half cycle in the input voltage signal to always determine a peak in the input voltage signal and to generate a discrete voltage feed-forward factor output that is always representative of a function of the peak input voltage in that half cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power factor correction control system comprising:
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a quantized voltage feed-forward device for providing a quantized voltage feed-forward signal, the device comprising; a plurality of comparators, each of the plurality of comparators monitoring an instantaneous input voltage signal and to compare the instantaneous input voltage with a discrete, predetermined reference voltage level, and to generate a state signal representative of said comparison; and a logic control circuit that processes the digital state signals from each of the plurality of comparators at an end of each half cycle in the input voltage signal to always determine a peak in the input voltage signal and to generate a discrete voltage feed-forward ratio output that is always representative of a function of the peak input voltage in that half cycle; and a signal multiplier that is structured and arranged to generate an input current reference waveform used to control the power factor of the input voltage which is based in part on the voltage feed-forward factor output generated by the logic control circuit. - View Dependent Claims (18, 19, 20)
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21. A method of providing a quantized voltage feed-forward signal to a power factor correction control system or other integrated circuit, the method comprising:
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comparing an instantaneous input voltage signal with a plurality of discrete, predetermined reference voltage levels; generating a state signal representative of each of said comparisons at an end of each half cycle in the input voltage signal; and generating a non-continuous, quantized, voltage feed-forward factor output that is always representative of a scaled function of the peak of the input voltage signal based on the state signals. - View Dependent Claims (22, 23, 24)
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Specification