Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2006-02-14
2006-02-14
Vu, Bao Q. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S224000, C323S284000
Reexamination Certificate
active
06998825
ABSTRACT:
An inductor6accumulates an energy therein or releases the accumulated energy according to the state of a main switch element10being turned ON/OFF. When the inductor6releases an energy, if a sub-switch element12is in the ON state, a current is passed through a circuit downstream of the sub-switch element12, thereby increasing an output voltage VO1. The sub-switch element12is a P-channel MOS transistor, and a sub-switch control circuit18outputs a control signal VCT1for the sub-switch element12. A level shift circuit19receives an output-side potential VP of the inductor6, and outputs, as a control signal VG1applied to the gate of the sub-switch element12, the potential VP if the control signal VCT1is at the L level or a potential (VP−VM) lower than the potential VP if the control signal VCT1is at the H level. Thus, the output voltage of the DC-DC converter can be made precisely equal to the target voltage.
REFERENCES:
patent: 5404095 (1995-04-01), Lammers
patent: 5929614 (1999-07-01), Copple
patent: 6507174 (2003-01-01), Qian
patent: 6512352 (2003-01-01), Qian
patent: 6696821 (2004-02-01), Haraguchi et al.
patent: 6936997 (2005-08-01), Mullett
patent: 2003-164143 (2003-06-01), None
Kawahara Tsukasa
Nagaoka Kazuhiko
Wada Satoshi
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
Vu Bao Q.
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