CHARGE PUMP CIRCUIT
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United States of America Patent
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N/A
Issued Date -
Jan 27, 2011
app pub date -
Oct 23, 2009
filing date -
Jul 22, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A rectifying device is used to prevent any reverse current in a charge pump circuit. Accordingly, energy stored in the charge pump circuit is prevented from being transmitted back to an input voltage source, or energy stored in a capacitor coupled to an output end is prevented from being transmitted back to the charge pump circuit and the input voltage source. Besides, a current limiting unit coupled to the input voltage source or/and the output end is used to protect devices of the charge pump circuit from being burned out due to an overly large current provided by the input voltage source to the charge pump circuit or/and an overly large current provided by the charge pump circuit to the output end when a short circuit occurs.
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