Variable blanking frequency for resonant converters
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United States of America Patent
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Jun 5, 2018
Issued Date -
Jan 18, 2018
app pub date -
Jun 29, 2017
filing date -
Jul 12, 2016
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Abstract
A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. The controller receives a feedback voltage and adjusts the feedback voltage to adjust a blanking frequency, which is an inverse of a blanking time during which the transistor is prevented from being turned on. The controller turns on the transistor after expiration of the blanking time based on a level of a resonant ring.
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