System and method for detection and compensation of aggressive output filters for switched mode power supplies
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United States of America Patent
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Jul 16, 2013
Grant Date -
Oct 27, 2011
app pub date -
Sep 30, 2010
filing date -
Apr 22, 2010
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Abstract
A controller for a switched mode power supply converting an input voltage to a regulated output voltage according to one embodiment includes a control network and a detection network. The control network develops a pulse width control signal for regulating a level of the output voltage. The detection network detects a phase lag of the output voltage and adjusts operation of the control network based on the phase lag. The phase lag may be determined from any parameter incorporating phase shift, such as the output voltage or the compensation voltage. Various alternative schemes are disclosed for adjusting the control loop, including, but not limited to, adding slope compensation, adjusting window resistance or window current, adding adjustment current to adjust ripple voltage, adjusting ripple transconductance, and adjusting ripple capacitance. Digital and analog compensation adjustment schemes are disclosed.
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