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    Remaining battery capacity measuring device
    1.
    发明公开
    Remaining battery capacity measuring device 有权
    Batterierestkapazitätsmesser

    公开(公告)号：EP0913698A1

    公开(公告)日：1999-05-06

    申请号：EP98120200.5

    申请日：1998-10-30

    申请人： TOSHIBA BATTERY CO., LTD.

    发明人： Shibuya, Nobuo ,  Miyamoto, Hideki ,  Sakai, Hirotaka ,  Tsuchihata, Makoto

    IPC分类号： G01R31/36

    CPC分类号： G01R31/3624 ,  G01R31/3655

    摘要： A remaining battery capacity measuring device having a microprocessor and an integrated circuit is packaged together with a secondary battery to form a battery pack. The integrated circuit includes a current measuring circuit for charging and discharging currents of a secondary battery, an overcurrent detection circuit for detecting overcurrent in the secondary battery, a driver circuit for driving a semiconductor switch for change and discharge control of the secondary battery, and a power switch circuit for power-saving operation. The current measuring circuit includes an operational amplifier for detecting a voltage across a resistor for current detection, and has a function to apply a variable offset voltage to the amplifier and a function to vary the gain of another operational amplifier for amplifying the output of the former operational amplifier. The current measuring circuit detects the voltage across the resistor independently of the overcurrent detection circuit, and enjoys high measurement accuracy. The overcurrent detection level and overcurrent detection response time of the overcurrent detection circuit can be externally set by an external divider circuit and an external variable capacitor. The power switch circuit selectively connects various circuit sections of the battery capacity measuring device to a power source, depending on the operating state, charging or discharging, of the secondary battery.

    摘要翻译： 具有微处理器和集成电路的剩余电池容量测量装置与二次电池一起封装以形成电池组。 集成电路包括用于对二次电池进行充电和放电的电流测量电路，用于检测二次电池中的过电流的过电流检测电路，用于驱动用于二次电池的变化和放电控制的半导体开关的驱动电路，以及 电源开关电路，省电运行。 电流测量电路包括用于检测用于电流检测的电阻器两端的电压的运算放大器，并且具有向放大器施加可变失调电压的功能，并且具有改变另一个运算放大器的增益的功能，用于放大前者的输出 运算放大器。 电流测量电路独立于过电流检测电路检测电阻两端的电压，测量精度高。 过电流检测电路的过电流检测电平和过电流检测响应时间可以由外部分压电路和外部可变电容器外部设定。 电源开关电路根据二次电池的工作状态，充电或放电选择性地将电池容量测量装置的各个电路部分连接到电源。