Method and apparatus for controlling a switching mode power supply during transition of load conditions to minimize instability
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United States of America Patent
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Mar 3, 2015
Grant Date -
Jan 27, 2011
app pub date -
Dec 29, 2009
filing date -
Jul 22, 2009
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Abstract
A controller for a switched mode power supply (SMPS) is provided. The SMPS is equipped with a transformer having a primary side winding, a secondary winding, and an auxiliary winding. The controller includes a detection circuit for detecting a transition from a first output load condition to a second output load condition of the SMPS and a control circuit coupled to the detection circuit and being configured to output one or more control signals in response to the detected output load transition. Depending on the embodiment, the one or more control signals include a first control signal for turning on a power switch to cause a current flow in a primary winding of the SMPS and/or one or more second control signals for turning off one or more functional circuit blocks in the controller.
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