Overvoltage and overcurrent protection circuit and mobile terminal

Abstract

The present invention is applicable to the field of power supply, and provides an overvoltage and overcurrent protection circuit and a mobile terminal; the overvoltage and overcurrent protection circuit includes: a primary protection circuit, which includes a power supply terminal, a detection terminal and a low potential interface terminal; a power supply terminal and a The detection terminals are respectively connected to the positive pole and the negative pole of the battery cell, and the low potential interface terminal is connected to the ground terminal of the charging and discharging interface; it also includes: a secondary protection circuit, which includes a high potential battery terminal, a low potential battery terminal and a high potential battery terminal. The interface end; the high-potential cell end is respectively connected to the positive pole and the negative pole of the battery cell, and the high-potential interface end is externally connected to the power supply end of the charge-discharge interface. In case of overcurrent or overvoltage, the primary protection circuit can control the MOS tube to disconnect the charge and discharge circuit, and at the same time, the fuse provided by the secondary protection circuit can further protect the charge and discharge circuit. Furthermore, even if the MOS tube is damaged, the battery cell and the charging and discharging circuit can still be protected by the fuse provided by the secondary protection circuit.

Description

technical field [0001] The invention belongs to the field of power supplies, in particular to an overvoltage and overcurrent protection circuit and a mobile terminal. Background technique [0002] With the progress of the times, the Internet and mobile communication networks provide a large number of functional applications. Users can not only use mobile terminals for traditional applications, such as: use smart phones to answer or make calls; at the same time, users can not only use mobile terminals for web browsing, picture transmission, games, etc. [0003] With the increase in the frequency of use of mobile terminals, mobile terminals need to be charged frequently. In order to avoid safety accidents caused by abnormal charging, a large number of primary protection circuits have been provided to prevent over-charging and over-discharging; however, in over-charging and over-discharging When discharging, the existing primary protection circuit (including overcharging and o...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an overvoltage and overcurrent protection circuit and a mobile terminal using a fuse for secondary protection, so as to solve the problem that the primary protection circuit in the prior art uses a MOS tube to control on or off, once the MOS tube Damage will cause the overcharge and overdischarge function to fail

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