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Invention Grant
CN104678153B 电流检测电路与电流检测方法及电池电量检测电路 有权

电流检测电路与电流检测方法及电池电量检测电路
Abstract:
公开了一种用于检测电池电量的电流检测电路、电流检测方法以及电池电量检测电路。该电流检测电路包括：检测单元，耦接至电池的正极或负极，用于对流入/流出电池的电流进行检测，该检测单元包括并联连接的检测支路{B(i)，i＝0，1，2，...，N}，其中对于i＝0，1，2，...，N‑1，检测支路B(i+1)的通态阻值大于检测支路B(i)的通态阻值；控制单元，将检测支路B(0)导通，并将检测单元两端的电压与检测阈值相比较，若检测单元两端的电压小于检测阈值，断开检测支路B(0)，在检测支路{B(i)，i＝1，2，...，N}中依次选择一个支路导通，直到检测单元两端的电压大于检测阈值；以及采样单元，耦接至检测单元的两端，当检测单元两端的电压大于检测阈值时，采样单元对检测单元两端的电压进行采样，输出模拟采样电压。
Abstract(English):

A battery fuel gauge current sensing circuit includes: a sense unit coupled in series with the battery and configured to sense the battery current; a control unit configured to adjust the ON resistance of the sense unit based on the comparison of the voltage across the sense unit and a threshold voltage until the voltage across the sense unit is greater than the threshold voltage; and a sample unit coupled across the sense unit and configured to sample the voltage across the sense unit and to provide an analog sample voltage when the voltage across the sense unit is greater than the threshold voltage.

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