Control method and circuit for resonant converters with capacitive protection
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United States of America Patent
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Mar 6, 2018
Grant Date -
Apr 20, 2017
app pub date -
Oct 18, 2016
filing date -
Oct 19, 2015
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Abstract
Control method and circuit for resonant converters with capacitive protection. When a resonant converter enters into a capacitive mode, a high-side switch and a low-side switch of the resonant converter are turned off. After the high-side switch and a low-side switch are turned off for N switching cycles, the high-side switch is turned on once a current sense signal flowing through a resonant inductor of the resonant converter is increased to a zero-crossing threshold during an ascent stage of the current sense signal, and the low-side switch is turned on once the current sense signal is decreased to the zero-crossing threshold during a descent stage of the current sense signal.
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