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:
Mar. 09, 2010
Filed:
Sep. 27, 2006
Hidekiyo Ozawa, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Takahiro Yoshino, Kasugai, JP;
Toru Nakamura, Kasugai, JP;
Hidekiyo Ozawa, Kasugai, JP;
Takashi Matsumoto, Kasugai, JP;
Takahiro Yoshino, Kasugai, JP;
Toru Nakamura, Kasugai, JP;
Fujitsu Microelectronics Limited, Yokohama, JP;
Abstract
This invention aims at providing a control circuit of power supply in which a secondary battery and a device are connected in parallel, to output capable of preventing over-charging of the secondary battery and supplying power from the secondary battery to the device, and a control method of the power supply. A deviceG and a secondary batteryG are connected to a DC-DC converterG in parallel. The deviceG is supplied with both a power from the DC-DC converterG and a power from the secondary batteryG. When the secondary batteryG is in non-charging state, an offset circuitG supplies a positive offset for reducing a difference of voltage between a detection signal VxG and reference voltage eG to a reference voltage eG corresponding to a charging inhibit signal CAS. An error amplifier ERAG reduces an actually flowing charging current CCG by an amount corresponding to the offset value as a result of recognizing that the charging current CCG flows more by the amount corresponding to the offset value.