Current detecting circuit and current overcurrent protection controller

Abstract

The invention provides a current detecting circuit and a current overcurrent protection controller. The current overcurrent protection controller comprises a first pin-out, a second pin-out, a third pin-out and the current detecting circuit, wherein the first pin-out is coupled with one end of the current detecting circuit; the second pin-out is coupled with the positive end of a battery module and the third pin-out is coupled with the negative end of the battery module; the current detecting circuit detects whether the current of the battery module exceeds a preset current according to a current detecting signal representing the current flowing through the current detecting circuit; the current detecting circuit comprises a reference voltage generation unit, a voltage dividing unit and a comparing unit; the reference voltage generation unit is coupled with the second pin-out and the third pin-out so as to generate a reference voltage; one end of the voltage dividing unit is coupled with the reference voltage, and generates a voltage dividing signal according to the reference voltage; and the comparing unit receives the voltage dividing signal and a current detecting signal, and is used for generating an overcurrent protection signal when the current exceeds the preset current.

Description

technical field [0001] The invention relates to a current detection circuit and a battery overcurrent protection controller, in particular to a current detection circuit with high precision and low temperature drift and a battery overcurrent protection controller. Background technique [0002] See figure 1 , figure 1 It is a schematic circuit diagram of an existing battery overcurrent protection controller. The battery overcurrent protection controller 100 includes a voltage detection unit 110 , a logic control unit 120 and a current detection circuit 130 . The voltage detection unit 110 detects the voltage of a battery module 10 to generate a voltage control signal DD. The current detection circuit 130 detects the current output by the battery module 10 to generate an over-current protection signal CC to prevent the battery module 10 from being in an over-discharge state. The logic control unit 120 receives the voltage control signal DD and the over-current protection s...

AI Technical Summary

Problems solved by technology

[0004] The withstand voltage capability of the comparison unit 132 also needs to be improved, so that the comparison unit 132 needs to use high-voltage components, which in turn affects the matching accuracy of components and the circuit layout area

In addition, the reference voltage generated by the reference voltage generation unit REF in the prior art will also change the reference voltage due to the influence of temperature changes, which will cause the comparison unit 132 to judge inaccurately, and may even damage the battery module 10

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