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:
Oct. 16, 2012
Filed:
Sep. 01, 2008
Junji Nishida, Osaka, JP;
Junji Nishida, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
When a control circuit detects from a signal CPOthat a battery voltage is less than a sixth reference voltage, a constant current operation in VFM control is performed with respect to a switching transistor and a synchronous rectification transistor in accordance with signals RVDET and CPO. Furthermore, when the control circuit detects from the signal CPOthat the battery voltage becomes equal to or greater than the sixth reference voltage, the constant current operation in PWM control is performed in accordance with a signal CPO. When an output signal CVDET from a constant current/constant voltage switching detection circuit becomes high level, operation control with respect to the switching transistor and the synchronous rectification transistor is switched from the PWM control of constant current operations to the PWM control of constant voltage operations in accordance with a signal CPO