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:
Apr. 05, 2005
Filed:
Oct. 14, 2003
Masayasu Ito, Shizuoka-ken, JP;
Hitoshi Takeda, Shizuoka-ken, JP;
Kentaro Murakami, Shizuoka-ken, JP;
Masayasu Ito, Shizuoka-ken, JP;
Hitoshi Takeda, Shizuoka-ken, JP;
Kentaro Murakami, Shizuoka-ken, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A switching regulator circuit for controlling power supplied to a load, includes: a switching device for repeatedly going on or off to control a voltage or a current applied to the load; a detector for detecting a supply voltage or a supply current supplied to the load; and a controller for controlling a duration ratio of a period in which the switching device is on or off based on the supply voltage or supply current detected by the detector, so as to control a value of the voltage applied to the load. The controller includes: a saw-tooth wave generation unit for charging and discharging a saw-tooth wave generation capacitor grounded at one end so as to change a voltage at another end of the saw-tooth wave generation capacitor to a saw-tooth wave; a charge/discharge controller for changing a ratio of a charge rate and a discharge rate of the saw-tooth wave generation capacitor based on the supply voltage or supply current detected by the detector; and a switching device controller for comparing a voltage value of the saw-tooth wave generation capacitor with a predetermined threshold value and controlling the duration ratio of the period in which the switching device is on or off based on the comparison result.