Resonant converter with auxiliary resonant components and holdup time control circuitry
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United States of America Patent
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Jun 23, 2015
Grant Date -
Aug 1, 2013
app pub date -
Jan 11, 2013
filing date -
Jan 13, 2012
priority date (Note) -
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Abstract
A resonant power converter is provided with auxiliary circuit branches and control circuitry for switchably coupling the auxiliary branches to resonant circuit components during holdup times. Auxiliary branches are coupled in parallel with any one or more of a resonant inductor, a resonant capacitor, and a magnetizing inductive winding via respective switches. When a holdup time condition is detected in accordance with, for example, a drop in the mains line voltage, the switches are controlled to adjust the corresponding inductance or capacitance for the duration of the holdup time condition or otherwise for a predetermined duration. The power converter in normal operation is configured for high efficiency and in a holdup time operation is configured to produce sufficient holdup time.
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