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    • 5. 发明申请
    • Current detection circuit of bidirectional switch
    • 双向开关电流检测电路
    • US20050189981A1
    • 2005-09-01
    • US10998799
    • 2004-11-30
    • Shinichiro Matsunaga
    • Shinichiro Matsunaga
    • G01R19/165G01R27/08H02J7/00H03D1/00
    • G01R19/16571G01R19/16542
    • A bidirectional main switch includes two main switches M1 and M2 formed of two main MOSFET's Q1 and Q2, respectively; a bidirectional mirror switch including two mirror switches M3 and M4 formed of two mirror MOSFET's Q3 and Q4, respectively, both being formed so as to allow a small current (a mirror current) to flow therein in a specified ratio to a current in the main MOSFET's Q1 and Q2; and an operational amplifier Op1 forming a feed back amplifying circuit having power supplied from two power sources of a positive source VDD and a negative source—VDD, being connected between the end of the bidirectional main switch and the end of the bidirectional mirror switch, and allowing the mirror current to flow in the bidirectional mirror switch through a sensing resistor Rs so as to equalize voltages at the ends of the two bidirectional switches, with which the mirror current, consequently a battery charge and discharge current, is detected from a voltage across the sensing resistor. Thus, a bidirectional current flowing the bidirectional main switch for cutting off an excessive charge current and an excessive discharge current of a battery E can be detected by a simple circuit with low power losses and a high accuracy.
    • 双向主开关包括分别由两个主MOSFET的Q 1和Q 2形成的两个主开关M 1和M 2; 分别包括由两个反射镜MOSFET的Q 3和Q 4形成的两个反射镜开关M 3和M 4的双向反射镜开关,两个反射镜开关M 3和M 4都形成为允许小电流(反射镜电流)以特定的比例流向其中 主MOSFET的Q1和Q2中的电流; 以及形成反馈放大电路的运算放大器Op1,其连接在双向主开关的端部和双向反射镜开关的端部之间,具有从正源VDD和负电源VDD的两个电源供给的电力, 并且允许反射镜电流在双向反射镜开关中通过感测电阻器Rs流动,以便均衡两个双向开关的端部处的电压,从而从其电压检测反射镜电流,从而检测电池充电和放电电流 跨越感测电阻。 因此,可以通过具有低功率损耗和高精度的简单电路来检测流过双向主开关的双向电流,以切断电池E的过充电电流和过大的放电电流。