Methods and devices for input waveform control in switching power supplies
First Claim
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1. A method for input waveform control of a switching power supply converter device, the method comprising steps of:
- accepting time-varying input power;
applying a distorted current waveform to the time-varying input power to introduce a controlled distortion into the time-varying input power, the distorted current waveform introducing, with respect to a fundamental current waveform of the time-varying input power, a limited number of harmonics of respective specific magnitudes or an approximation thereof into the input power to achieve a predetermined non-unity power factor.
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Abstract
The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific, computable waveforms that permit use of a minimum filter size given a desired target power factor.
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Citations
13 Claims
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1. A method for input waveform control of a switching power supply converter device, the method comprising steps of:
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accepting time-varying input power; applying a distorted current waveform to the time-varying input power to introduce a controlled distortion into the time-varying input power, the distorted current waveform introducing, with respect to a fundamental current waveform of the time-varying input power, a limited number of harmonics of respective specific magnitudes or an approximation thereof into the input power to achieve a predetermined non-unity power factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit for producing a correction current waveform for input waveform control of a switching power supply converter device, the circuit comprising:
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means for observing an input voltage waveform from a power source; means for truncating a signal corresponding to the voltage waveform by a truncation amount that targets a specific non-unity power factor to produced a truncated waveform; means for scaling and subtracting the truncated waveform from the absolute value of the input voltage waveform to produce the correction current waveform. - View Dependent Claims (13)
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Specification