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    • 112. 发明申请
    • Protective circuit
    • 保护电路
    • US20070097572A1
    • 2007-05-03
    • US11262542
    • 2005-10-28
    • Bin Wu
    • Bin Wu
    • H02H3/00
    • H02J7/0031
    • A protective circuit for a battery includes: (1) an MOS transistor having a first drain/source terminal coupled to one terminal of the battery; (2) a switch selectable to couple the bulk terminal of the MOS transistor to (a) the first drain/source terminal, (b) a second drain/source terminal, or (c) float; and (3) a control circuit which provides control signals for the gate terminal of the MOS transistor and the switch. By allowing the bulk terminal to float during normal operation (i.e., charging or discharging operation), a sensitive, low-power comparator used in the prior art is eliminated, thereby allowing the protective circuit to have a small foot-print. The protective circuit may further include a resistor. The switch connects the bulk terminal of the MOS transistor to the first drain/source terminal through this first resistor, thereby limiting any “rush” current which occurs when the battery circuit switches from discharging to charging, or vice versa, over a very short time period. Consequently, safe operation of the battery circuit is achieved.
    • 一种用于电池的保护电路包括:(1)具有耦合到电池的一个端子的第一漏极/源极端子的MOS晶体管; (2)可选择用于将MOS晶体管的体端子耦合到(a)第一漏极/源极端子,(b)第二漏极/源极端子或(c)浮置的开关的开关; 和(3)提供MOS晶体管的栅极端子和开关的控制信号的控制电路。 通过允许批量端子在正常操作(即充电或放电操作)期间浮动,消除了现有技术中使用的灵敏的低功率比较器,从而允许保护电路具有小的脚印。 保护电路还可以包括电阻器。 该开关通过该第一电阻将MOS晶体管的体端子连接到第一漏极/源极端子,从而限制当电池电路从放电切换到充电时发生的任何“急剧”电流,反之亦然,在非常短的时间内 期。 因此,实现了电池电路的安全运行。