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. 04, 2014
Filed:
Aug. 06, 2010
Zutao Liu, Shanghai, CN;
Zutao Liu, Shanghai, CN;
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shanghai, CN;
Abstract
The present invention relates to a battery charge/discharge protection circuit that protects an associated battery from charge/discharge damage. The charge/discharge protection circuit includes a first terminal, a second terminal, a charge over-current detection circuit, a discharge over-current detection circuit, a short circuit detection circuit, and a PMOS transistor. A drain electrode and a gate electrode of the PMOS transistor are connected to the first terminal and the second terminal respectively. A source electrode of the PMOS transistor is connected to the charge over-current detection circuit, the discharge over-current detection circuit and the short circuit detection circuit, such that when a voltage above an overvoltage threshold is supported by the charger, the voltage of the source electrode of the PMOS transistor is maintained above a negative threshold voltage and the elements in these circuits do not receive such a voltage output by the charger.