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Charge pumps are a form of DC-DC converter that use a capacitor as the storage element. They often have a higher efficiency and lower cost than inductor based designs when current requirements are low.

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Voltage doubler

Perhaps it would be easier to understand how does this circuit works if you re-draw the scheme to be more obvious. Actually, this scheme with full explanation is given in: http://www.cirvirlab.com/in …
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