A current detection and control device for a mobile terminal

Abstract

The invention discloses a current detection and control device for a mobile terminal. The device comprises a battery connector, a current amplification module, a comparator, a first resistor, a second resistor, a third resistor, a switch control module and an alarm module, wherein the anode of the battery connector is connected with the first end of the current amplification module through the first resistor and connected with the first end of the switch control module through the third resistor; the third end and the fourth end of the current amplification module are connected with positive and negative input ends of the comparator respectively; the output end of the comparator is connected with the second end of the switch control module; and the first end of the switch control module is connected with the second end of the current amplification module through the second resistor, and the third end is connected with the power supply end of the mobile terminal. According to the device, current on a power line can be detected in real time through the current amplification module, pressure drop on the third resistor is increased until exceeding an offset voltage range of the comparator when abnormal current occurs, then the comparator outputs a high level to enable the switch control module to be off and a battery to stop supplying power, and the mobile terminal can be protected.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a current detection and control device for a mobile terminal. Background technique [0002] Due to the rapid expansion of mobile phone functions and powerful performance, the operating current of the mobile phone will increase when various functions are used. Generally, the current of a mobile phone in normal use is about 200mA. Since the mobile phone will automatically search for a GSM or WCDMA network when it is turned on, the instantaneous current at this time can reach more than 2A. For example, a mobile phone with a four-inch screen has a current of 500-600mA during normal use. During the use of this type of high-current consumption mobile phone, especially when operating various functions of the mobile phone, there will be an instantaneous high current exceeding 2A, but this happens for a very short time, usually in milliseconds , The probability of damage to...

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Problems solved by technology

[0003] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a current detection control device for a mobile terminal, which can detect the current size on the power line in real time during the use of the mobile phone, and block the power supply when an abnormal current occurs, so as to Solve the damage caused by abnormal current to mobile phone chips and other peripheral circuits

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