Application of NTC thermistor in charging circuit.Human Body Temperature Monitoring Sensor

　　According to the working principle of NTC thermistor, share the usage scenarios in the charging circuit:

　　Because the rechargeable battery may cause excessive temperature of the battery during the continuous cycle of charging and discharging, resulting in a decrease in the original performance of the battery. In order to maintain battery performance, close monitoring of battery temperature is very important, and NTC can be used for temperature monitoring, control and compensation in suitable applications inside rechargeable battery packs.

　　The equivalent circuit of this charging circuit is as follows. The NTC thermistor Rv and the measuring resistor Rm (precision resistor) form a simple series voltage divider circuit. The reference voltage VCC_Ref can be divided into a voltage value that changes with the temperature value. The value of this voltage will reflect the size of the NTC resistance, which is the corresponding temperature value, and then the Charging IC monitors the temperature of the battery according to the NTC thermistor, which can safely control the charging and discharging of the lithium battery or NiMH battery.

　　The design cycle life of the battery can be guaranteed.

　　Batteries can be charged more cost-effectively.

　　Accurate temperature measurement by thermistor is an important auxiliary element for displaying the remaining time of the battery.

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