Controllable Universal Supply with Reactive Power Management
First Claim
1. A method of managing reactive power, the method comprising:
- rectifying a substantially sinusoidal source voltage waveform from a source to a rectified voltage node;
providing a switch arranged to selectively couple the rectified voltage node to a load;
determining a pulse width value for turning on the switch to deliver a desired average power to the load;
receiving information about relative power drawn from the source during adjacent quadrants of the source voltage waveform;
determining a switch turn on delay time to substantially equalize power between adjacent quadrants of the same polarity; and
,controlling the switch during at least two successive half cycles of the source voltage waveform according to the determined switch turn on delay time.
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Accused Products
Abstract
Apparatus and associated methods involve a controllable supply adapted for controlling switch phasing and pulse width to substantially equalize power in adjacent quadrants of a sinusoidal source voltage waveform to regulate reactive power drawn from the source. In an illustrative example, the supply may, in some embodiments, deliver power to a load at a level responsive to a commanded input signal. In some examples, the power supplied to the load may be adjusted according to the command input signal to a selected value within an operating range. In some examples, the operating range may include a portion or all of 0 to 100% of rated load. Various embodiments may be adapted to supply unipolar or bipolar load excitation. In some embodiments, high power factor may be maintained over a substantial range of commanded power to the load. Certain embodiments may enhance supply efficiency by capturing and recycling inductive load energy.
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Citations
10 Claims
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1. A method of managing reactive power, the method comprising:
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rectifying a substantially sinusoidal source voltage waveform from a source to a rectified voltage node; providing a switch arranged to selectively couple the rectified voltage node to a load; determining a pulse width value for turning on the switch to deliver a desired average power to the load; receiving information about relative power drawn from the source during adjacent quadrants of the source voltage waveform; determining a switch turn on delay time to substantially equalize power between adjacent quadrants of the same polarity; and
,controlling the switch during at least two successive half cycles of the source voltage waveform according to the determined switch turn on delay time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification