Control circuit and method for charge pump circuit with...

Details Control circuit and method for charge pump circuit with... Control circuit and method for charge pump circuit with...

2008-07-28

2011-10-18

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

With voltage multiplication means

Reexamination Certificate

active

08040701

ABSTRACT:
A first switch group includes switches provided on a path for charging a flying capacitor using an input voltage. A second switch group includes switches provided on a path for charging an output capacitor using charge stored in the flying capacitor. A pulse modulator generates a pulse signal having a duty ratio adjusted so that a feedback voltage corresponding to an output voltage of a charge pump circuit matches a given reference voltage. A driver receives the pulse signal from the pulse modulator, and turns on either one of the first switch group and the second switch group during a period corresponding to a high-time of the pulse signal and turns on the other switch group during a period corresponding to a low-time thereof.

REFERENCES:
patent: 6400211 (2002-06-01), Yokomizo et al.
patent: 6917240 (2005-07-01), Trafton et al.
patent: 7737767 (2010-06-01), Oyama et al.
patent: 7847621 (2010-12-01), Oyama et al.
patent: 2008/0158915 (2008-07-01), Williams
patent: 2009/0027022 (2009-01-01), Oyama et al.
patent: 2000262043 (2000-09-01), None

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