The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2011
Filed:
Jun. 18, 2009
Katsuhisa Furuse, Hyogo, JP;
Yasuhiro Ishizaka, Osaka, JP;
Shohtaroh Sohma, Osaka, JP;
Koichi Hagino, Hyogo, JP;
Shinichiro Yamada, Osaka, JP;
Toshiya Murota, Hyogo, JP;
Masanobu Fukushima, Hyogo, JP;
Katsuhisa Furuse, Hyogo, JP;
Yasuhiro Ishizaka, Osaka, JP;
Shohtaroh Sohma, Osaka, JP;
Koichi Hagino, Hyogo, JP;
Shinichiro Yamada, Osaka, JP;
Toshiya Murota, Hyogo, JP;
Masanobu Fukushima, Hyogo, JP;
Ricoh Company, Ltd., Tokyo, JP;
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.