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:
Jun. 10, 2014
Filed:
Mar. 27, 2012
Huan Xia, Shenzhen, CN;
Huan Xia, Shenzhen, CN;
Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Shenzhen, CN;
Hon Hai Precision Industry Co., Ltd., New Taipei, TW;
Abstract
A protection circuit for lithium-ion battery is provided. The protection circuit samples the voltage of the lithium-ion battery as a sample voltage and outputs the sample voltage. A switch circuit includes a first switch having two first connection terminals and a first control terminal. The first switch connects the two connection terminals when the control terminal receives a high logic level and disconnects the two connection terminals when the control terminal receives a low logic level. One of the first connection terminals is connected to the lithium-ion battery through a first current-limiting resistor to receive a battery voltage and is connected to an output terminal of the switch circuit, the other first connection terminal is grounded. The output terminal outputs a logic low level as a turn-on signal and a logic high level as a turn-off signal of the lithium-ion battery.