Apparatus and method for detecting a change in output voltage of an isolated power converter
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United States of America Patent
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Jan 28, 2014
Grant Date -
Mar 28, 2013
app pub date -
Nov 19, 2012
filing date -
Apr 29, 2010
priority date (Note) -
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Abstract
A power converter controller includes a drive circuit coupled to control switching of a power switch coupled to an energy transfer element and an input of the power converter. An output voltage sensor including first and second pulse sampler circuits is coupled to capture first and second peak voltages, respectively, that are representative of a second peak of a ringing voltage of a feedback signal representative of an output of the power converter. The first pulse sampler circuit is coupled to capture the first peak voltage at a first time in the feedback signal. The second pulse sampler circuit is coupled to capture the second peak voltage at a second time in the feedback signal. The drive circuit is coupled to receive a change signal from the output voltage sensor in response to the first and second peak voltages.
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