DAMPER CIRCUIT FOR SWITCHED DIMMING
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United States of America Patent
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Issued Date -
Jul 28, 2016
app pub date -
Dec 11, 2015
filing date -
Jan 26, 2015
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Abstract
Circuitry for damping transitions in an input current of a power converter includes a transistor with a control terminal coupled to receive an impedance control signal and main terminals coupled to variably impede the input current of the power converter in response to the impedance control signal. An impedance control circuit is coupled across input rails of the power converter to provide the impedance control signal. The impedance control circuit includes a first current conduction path coupling the control terminal to a first of the input rails of the power converter, and a second current conduction path coupling the control terminal to a second of the input rails of the power converter. The second of the input rails of the power converter is coupled to the main terminals of the transistor.
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