Resonant converter and controlling method thereof
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United States of America Patent
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May 16, 2017
Grant Date -
Feb 19, 2015
app pub date -
Aug 8, 2014
filing date -
Aug 15, 2013
priority date (Note) -
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Abstract
A resonant converter and its controlling method are provided. The resonant converter includes a bridge switching circuit receiving a DC input voltage through its power terminal, a resonant and transforming circuit, a rectifying and filtering circuit, and an over-current protecting circuit. The resonant and transforming circuit has at least one resonant capacitor charged/discharged in response to the switching of the bridge switching circuit. The rectifying and filtering circuit rectifies and filters outputs of the resonant and transforming circuit, and generates a driving voltage accordingly. The over-current protecting circuit is coupled to the power terminal and crosses over the resonant capacitor to form a clamp path. The over-current protecting circuit detects a current flowing through the resonant and transforming circuit or a load and determines whether to conduct/cut off the clamp path according to the detection result to limit a cross voltage of the resonant capacitor within a first voltage range.
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