Charging and discharging circuit with automatic protecting function

Abstract

The invention provides a charging and discharging circuit with an automatic protecting function. The charging and discharging circuit comprises a power source input end, a power source output end, a battery, a charging module and a voltage boost module, wherein the charging module comprises a charger, a battery voltage feedback unit and a first switch unit, the charger comprises a charging current detecting unit, an input voltage detecting unit, a voltage comparison module and a charging control unit, and the first switch unit is connected between the power source input end and the battery; the voltage boost module comprises a voltage boost converter, an output voltage feedback unit, a power switch tube and a second switch unit, and the voltage boost converter comprises a battery voltage detecting unit, a discharging current detecting unit and a voltage boost control unit. The charging and discharging circuit achieves the automatic protecting function and meanwhile can reduce the number of components, and therefore the overall area of the circuit is reduced, cost is saved, the complexity of the circuit is reduced, and the reliability of the circuit is improved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a charging and discharging circuit with an automatic protection function. Background technique [0002] In order to realize the charging, discharging and protection functions of the mobile power supply, the traditional circuit generally consists of three parts, such as figure 1 As shown, it includes: a charging module composed of a charger 101 and a P-type field effect transistor 102 with a switchable substrate, and a charging module composed of a fuse 103, a battery protection chip 111 and back-to-back N-type field effect transistors 112. A battery protection module for protecting the battery 104 , and a boost module composed of a boost converter 105 , an inductor 106 , an N-type field effect transistor 107 , a rectifier diode 108 , and feedback resistors 109 and 110 . [0003] The following takes the battery 104 as a lithium battery (but not limited to a lithium battery) as ...

AI Technical Summary

Problems solved by technology

It can be seen that in the prior art, in order to realize the charging, discharging control and automatic protection functions of the mobile power supply, at least a fuse 103, back-to-back N-type field effect transistors 112 and three independent integrated circuit chips-the charger 101, boost converter 105 and battery protection chip 111, resulting in complex circuit and high cost

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