Inductive compensation based control of synchronous rectification switch
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United States of America Patent
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Sep 20, 2016
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N/A
app pub date -
May 28, 2015
filing date -
May 28, 2015
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Abstract
An electronic device includes a synchronous rectification circuit having an actively controlled switching element through which resonant current flows during operation. The actively controlled switching element is disposed in a package which adds stray inductance to a main current path of the synchronous rectification circuit. The electronic device also includes a fixed inductor magnetically coupled to the stray inductance or an additional inductance in series with the stray inductance so that the fixed inductor is not in the main current path of the synchronous rectification circuit and change in current through the inductance to which the fixed inductor is magnetically coupled induces a reference voltage at the fixed inductor which is in phase with a zero crossing point of the resonant current at different switching frequencies of the actively controlled switching element. A corresponding method of controlling the electronic device is also described.
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