Digital charge-mode control of a power supply
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United States of America Patent
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Aug 16, 2011
Grant Date -
Jun 10, 2010
app pub date -
Apr 20, 2009
filing date -
Dec 5, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed herein are an apparatus and method for charge-mode control. An embodiment of a charge mode controller may include an analog/digital converter configured to monitor the current through a duty cycle switch and convert the current to a switch current value; an accumulator module configured to integrate the switch current value during the switching cycle and output an accumulated charge value; and a comparator module responsive to the accumulated charge value and a charge set point configured to generate a gate drive signal for the duty cycle switch that turns the duty cycle switch ON when the accumulated charge value is less than the charge set point and turns the duty cycle switch OFF when the accumulated charge value reaches the charge set point and thereby controls the duty cycle of the converter and the power supplied by the power stage.
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