POWER FACTOR CORRECTION CONTROLLER WITH DIGITAL FIR FILTER OUTPUT VOLTAGE SAMPLING
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United States of America Patent
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app pub date -
Dec 31, 2007
filing date -
May 2, 2007
priority date (Note) -
Abandoned
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Abstract
A power control system includes a digital FIR filter in an output voltage feedback loop of a switching power converter. A feedback loop includes an output voltage signal of the switching power converter. The output voltage signal includes direct current (DC) and alternating current (AC) components. The FIR filter provides discrete samples of an output voltage feedback signal to a switch state controller that allows the switch state controller to generate a control signal that reflects a relatively quick response to changes in the output voltage signal while reducing an influence of the AC component. In at least one embodiment, the FIR filter is configured to generate the discrete samples at a sampling frequency f.sub.s, the sampling frequency f.sub.s is approximately an integer multiple of a line frequency f.sub.L, and the line frequency f.sub.L is a frequency of a line input voltage supplied to the switching power converter.
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