Switched mode power supply with efficient operation at light loads and method therefor
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United States of America Patent
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Jun 5, 2018
Issued Date -
Nov 24, 2016
app pub date -
Apr 25, 2016
filing date -
May 20, 2015
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Abstract
A switched mode power supply includes an active clamp flyback converter having an input for receiving an input voltage, and an output for providing a regulated voltage, the active clamp flyback converter having a first switch for controlling a flow of current through a primary winding of a flyback transformer, and a second switch for clamping a switch node on a primary side of the flyback transformer, and a controller for controlling the first and second switches to operate the active clamp flyback converter in an active clamp flyback mode when a load current is above a first predetermined level, and for controlling the first and second switches to operate the active clamp flyback converter in a discontinuous conduction mode with a variable switching frequency when the load current is below a second predetermined level.
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