Title:
スイッチング電源回路
Document Type and Number:
Japanese Patent JP5470765
Kind Code:
B2
Abstract:
A switching power supply circuit for generating an output voltage at an output node based on an input voltage at an input node includes a reference voltage generating circuit configured to generate a reference voltage such that during an initial start-up period of the reference voltage a voltage rise rate of the reference voltage within a first predetermined period from a start point of the initial start-up period and a voltage rise rate thereof within a second predetermined period immediately preceding an end point of the initial start-up period are smaller than a voltage rise rate thereof in a period between the first predetermined period and the second predetermined period, a coil disposed between the input output nodes, and a switch circuit configured to switch on and off to control current through the coil in response to comparison between the reference voltage and a voltage proportional to the output voltage.
Inventors:
Katsuhisa Furuse
Yasuhiro Ishizaka
Soma Shotaro
Koichi Hagino
Shinichiro Yamada
Toshiya Murota
Tadashi Fukushima Exhibition
Yasuhiro Ishizaka
Soma Shotaro
Koichi Hagino
Shinichiro Yamada
Toshiya Murota
Tadashi Fukushima Exhibition
Application Number:
JP2008185954A
Publication Date:
April 16, 2014
Filing Date:
July 17, 2008
Export Citation:
Assignee:
株式会社リコー
International Classes:
H02M3/155; H02M3/157
Domestic Patent References:
| JP6250747A | ||||
| JP2007195362A | ||||
| JP2005168169A | ||||
| JP2004272447A | ||||
| JP2008131763A | ||||
| JP2003324939A | ||||
| JP2004297983A | ||||
| JP2004173481A | ||||
| JP200694687A | ||||
| JP200496937A | ||||
| JP2004364393A | ||||
| JP200423948A |
Foreign References:
| US6198258 | ||||
| WO2008001506A1 | ||||
| WO2006068012A1 |
Attorney, Agent or Firm:
Mitsuo Tanaka
Kyousei Tamura
Masahiro Ishino
Kyousei Tamura
Masahiro Ishino