Title:
昇降圧型DC-DCコンバータの制御方法、昇降圧型DC-DCコンバータの制御回路、および昇降圧型DC-DCコンバータ
Document Type and Number:
Japanese Patent JP5023819
Kind Code:
B2
Abstract:
To provide a control circuit and control method of a step-up/step-down type DC-DC converter capable of realizing high efficiency. In a state ( 1 ), a terminal Tx of a choke coil L 1 is connected to an input terminal Tin, and a terminal Ty is connected to a reference potential. In a state ( 2 ), the terminal Tx is connected to the reference potential, and the terminal Ty is connected to an output terminal Tout. In the state ( 3 ), the terminal Tx is connected to the input terminal Tin, and the terminal Ty is connected to the output terminal Tout. A first period operation TO 1 is constituted by the states ( 1 ) and ( 2 ), and a second period operation TO 2 is constituted by the states ( 1 ) and ( 3 ). A second period T 2 , in which the second period operation TO 2 is performed, is a value n times as long as a first period T 1 , in which the first period operation TO 1 is performed. In the second period operation TO 2 , the state ( 1 ) is switched to the state ( 3 ) so that an increasing slope of an inductor current IL is reduced.
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Inventors:
Kenichi Inatomi
Ryuta Nagai
Takashi Matsumoto
Ryuta Nagai
Takashi Matsumoto
Application Number:
JP2007151323A
Publication Date:
September 12, 2012
Filing Date:
June 07, 2007
Export Citation:
Assignee:
Fujitsu Semiconductor Limited
International Classes:
H02M3/155
Domestic Patent References:
| JP2005192312A | ||||
| JP2003507997A |
Foreign References:
| WO2007030199A1 | ||||
| US6037755 | ||||
| US6087816 |
Attorney, Agent or Firm:
Patent business corporation NEXT
Hiroto Tanaka
Hiroto Tanaka