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:
Dec. 17, 2013
Filed:
Jun. 14, 2007
Kazuo Yamazaki, Atsugi, JP;
Hidenori Tanaka, Atsugi, JP;
Yukihiro Terada, Atsugi, JP;
Toshio Nagai, Tokyo, JP;
Kazuo Yamazaki, Atsugi, JP;
Hidenori Tanaka, Atsugi, JP;
Yukihiro Terada, Atsugi, JP;
Tamiji Nagai, Kawasaki, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
A charge and discharge circuit and a battery pack, both capable of voluntarily perform proper switching between a charge operation and a discharge operation of a secondary battery according to various situations, are provided. The charge and discharge circuit of a secondary battery is one capable of charging the secondary battery Eby a power source voltage and of supplying power from the secondary battery Eto an external device. Then, the charge and discharge circuit includes a bidirectional regulatorcapable of adjusting an output in both of a charge direction of feeding the current to the side of the secondary battery Eand a discharge direction of feeding the current from the secondary battery Eto the side of the external device, a charge and discharge detecting circuitfor detecting a direction of the current flowing in the secondary battery E, and a switching control circuitfor switching the operation direction of the bidirectional regulatorbased on the detection of the charge and discharge detecting circuit