Single ended flyback power supply controllers with integrator to integrate the difference between feedback signal a reference signal
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United States of America Patent
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Nov 4, 2008
Grant Date -
Nov 29, 2007
app pub date -
Jun 1, 2006
filing date -
May 23, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to SMPS controllers employing primary side sensing to detect a point of zero magnetic flux, at which the output voltage of the SMPS may be sampled accurately on the primary side. We describe a switch mode power supply (SMPS) controller for regulating the output voltage of an SMPS is response to a feedback signal from an auxilliary winding of a magnetic energy storage device forming part of an output circuit of the SMPS, the SMPS controller comprising: a reference level input to receive an output reference level signal; an input to receive said feedback signal, said feedback signal being responsive to a voltage on said auxilliary winding of said magnetic energy storage device; an integrator to integrate a difference between said feedback signal and a first fixed reference level signal; a first comparator to compare an output of said integrator with a second fixed reference level signal and to provide an output responsive to said comparison for regulating said SMPS output voltage.
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