PWM power supplies using controlled feedback timing and methods of operating same
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United States of America Patent
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Jul 24, 2007
Grant Date -
Mar 11, 2004
app pub date -
Sep 6, 2002
filing date -
Sep 6, 2002
priority date (Note) -
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Abstract
A closed loop power converter circuit of a UPS or other power supply includes a pulse width modulator circuit in a forward path of the closed loop power circuit. A compensation circuit provides pulse width commands to the pulse width modulator at a first rate. A feedback circuit digitally filters samples of an output of the closed loop power converter at a second rate greater the first rate and that provides the filtered samples to the compensation circuit. In some embodiments, the compensation circuit may be operative to compensate for the phase lag associated with a low pass output filter.
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