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AssigneeRichtek Technology Corporation
InventorsChao-Hsuan Chuang, Cheng-Hsuan Fan, Hung-Che Chou
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A flyback converter has a controller to switch a power switch so as to convert an input voltage to an output voltage for a load by monitoring an output voltage dependent signal and a current sensing signal derived from a current flowing through the power switch, a light-load efficiency improving apparatus monitors the load and a supply voltage provided for the controller to selectively clamp the output voltage dependent signal when the load is lower than a first threshold value and the supply voltage is lower than a second threshold value, so as to increase the supply voltage.
A light-load efficiency improving apparatus for a flyback converter which is operative to convert an input voltage to an output voltage for a load by switching a power switch by a controller receiving a supply voltage, an output voltage dependent signal from a feedback input, and a current sensing signal derived from a current flowing through the power switch, the controller turning off the power switch when the output voltage dependent signal is lower than the current sensing signal, the light-load efficiency improving apparatus comprising:
A light-load efficiency improving method for a flyback converter which is operative to convert an input voltage to an output voltage for a load by switching a power switch by a controller receiving a supply voltage, an output voltage dependent signal from a feedback input, and a current sensing signal derived from a current flowing through the power switch, the controller turning off the power switch when the output voltage dependent signal is lower than the current sensing signal, the light-load efficiency improving method comprising the steps of:
A flyback converter comprising:
Dependencies are inferred from the claim text.