Battery charging protector

Abstract

The battery charging protector includes a charging control circuit, a charging triode and a charging current setting resistor connected in series with the emitter terminal of the charging triode, and a temperature protection circuit. The negative electrode of the thermal thyristor is connected to the emitter of the charging triode, and the positive electrode is connected to the base of the charging triode, and the temperature coefficients of the charging current setting resistor and the temperature setting resistor are both positive. The present invention uses the triode as the shut-off device, which increases the speed of the shutdown and restart process of charging, reduces the prolongation of charging time caused by temperature protection, and at the same time, because the triode usually has better pressure resistance performance, it can reduce the withstand voltage of the adjustment tube when it is working. Amplitude, using charging current setting resistors and temperature setting resistors with positive temperature coefficients, can stabilize the temperature during charging to a certain extent.

Description

technical field [0001] The invention belongs to the field of communication electronics and relates to a battery charging circuit, in particular to a battery charging protector. Background technique [0002] With the rapid development of science and technology, the relationship between people in the communication industry is getting closer and closer, and they are playing an increasingly important role in people's daily life and work. Any communication device is inseparable from a stable and reliable power supply as a power supply system. In order to meet the various needs of current users, in addition to handling basic call functions, mobile communication terminals also have a variety of multimedia functions, such as MP3, photography, video playback, etc. Video files, radios, running work or game software, etc., are added with various components in order to realize the above functions, which consume more battery power when compared with conventional portable terminals. [0...

AI Technical Summary

Problems solved by technology

[0003] Many users have such needs. When the battery of the mobile phone is low, performing various operations while charging the mobile phone will inevitably cause the mobile phone to heat up and the temperature will rise. At the same time, the temperature of the mobile phone battery will also increase the temperature of the battery when charging. When the battery temperature is too high, if it is not controlled, it will damage the battery or damage the equipment, shorten the service life of the battery, and cause the risk of explosion in severe cases

[0004] The original charging protection circuit usually directly uses the regulating tube as a switch, but no matter whether the regulating tube is turned off or on, because the discharge and establishment of the gate-source voltage are similar to the charge and discharge of the gate-source capacitor, it takes a long time, so it appears to be interrupted during the charging process. The charging time is greatly extended

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