Reducing switching losses in power converters
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United States of America Patent
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Feb 20, 2018
Grant Date -
Feb 8, 2018
app pub date -
Aug 3, 2016
filing date -
Aug 3, 2016
priority date (Note) -
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Abstract
A switching power converter converts power from an input source for delivery to a load at the converter output. The converter comprises at least two switches connected in series across either the input source or the output, and an inductor connected to a central node between the two switches. A controller operates the converter in a series of converter operating cycles, each operating cycle comprising an input phase, during which one of the two switches is conductive, the inductor receives energy from the input source, and a current in the inductor is increasing positively, phase. The controller is configured to adjust the duration of the input phase, and the amount of energy stored in the inductor at the end of the input phase, as a function of a an amount of energy required to charge or discharge the node capacitance during the energy recycling phase.
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