High-efficiency DC/DC voltage converter including capacitive switching pre-converter and up inductive switching post-regulator
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United States of America Patent
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Oct 12, 2010
Grant Date -
Jul 3, 2008
app pub date -
Aug 8, 2007
filing date -
Dec 30, 2006
priority date (Note) -
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Abstract
A DC/DC converter includes a pre-converter stage, which may include a charge pump, and a post-regulator stage, which may include a boost converter. The duty factor of the post-regulator stage is controlled by a feedback path that extends from the output terminal of the DC/DC converter to an input terminal in the post-regulator stage. The pre-converter steps the input DC voltage up or down by a positive or negative integral or fractional value, and the post-regulator steps the voltage up by a variable amount depending on the duty factor at which the post-regulator is driven. The converter overcomes the problems of noise glitches, poor regulation, and instability, even near unity input-to-output voltage conversion ratios.
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