Method and apparatus for efficient switching in semi-resonant power converters
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United States of America Patent
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Jun 12, 2018
Issued Date -
Nov 2, 2017
app pub date -
Apr 29, 2016
filing date -
Apr 29, 2016
priority date (Note) -
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Abstract
A voltage converter includes a power stage, a passive circuit, a synchronous rectification (SR) switch component, and a control circuit. The passive circuit couples the power stage to an output node of the voltage converter, and is switchably coupled to ground by the SR switch component. The SR switch component includes a plurality of SR switches, which are independently controllable. The control circuit determines which of the SR switches are to be activated/enabled, and only uses those SR switches in its variable switching of the voltage converter. The determination of which SR switches are to be activated/enabled is based upon an estimate of the output current for the voltage converter. By using more SR switches when the voltage converter is fully loaded, and fewer SR switches when it is lightly loaded, the power loss of the SR switch component is minimized and the voltage converter is more power efficient.
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