Apparatus and methods for control of discontinuous-mode power converters
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United States of America Patent
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Oct 10, 2017
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app pub date -
Mar 11, 2013
filing date -
Mar 11, 2013
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Abstract
A switching power converter comprising an inductor and one or more switches and configured to operate in a discontinuous operating mode comprises a clamp circuit connected to the ends of the inductor for trapping energy in the inductor during a clamp period. The clamp circuit comprises a first and a second clamp switch connected in series, the clamp circuit arranged and configured to block a voltage of either polarity when both switches are OFF; conduct a current of either polarity when both switches are ON; conduct uni-directionally in one direction when one of the clamp switches is ON; and conduct uni-directionally in the other direction when the other one of the clamp switches is ON. A controller turns the one or more switches ON and OFF to transfer energy from the input to the inductor and from the inductor to the output during an energy transfer phase.
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