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    • 8. 发明授权
    • Overcharge current protection circuit and battery pack using same
    • 过充电保护电路和电池组使用相同
    • US5602460A
    • 1997-02-11
    • US430669
    • 1995-04-28
    • Jose M. FernandezVernon MeadowsErika D. MackIilonga P. Thandiwe
    • Jose M. FernandezVernon MeadowsErika D. MackIilonga P. Thandiwe
    • H02J7/00H02J7/04
    • H02J7/0031
    • A battery pack (62) comprises cells (74), and is charged by a charger (64) providing a current level. The charger (64) is a typical nickel-cadmium battery charger providing a first charge current level in excess of an optimum charge current level. The battery pack (62) further comprises a thermal sensing element (76) and an overcurrent charge protection circuit having an overcurrent switch (78), current sense circuit (80), comparator circuit (82), and temperature signal switch (84). If the current level through the cells (74) exceeds the optimum charge current level, the current sense circuit (80) provides a signal to comparator circuit (82) which actuates the temperature signal switch (84), simulating a hot battery pack. The charger (64) then switches to a second charge current level which does not exceed the optimum charge current level. If the charger (64) does not change current levels, a switch delay (86), after a brief period, accumulates enough voltage to actuate a driver switch (88) which opens the overcurrent switch (78), disconnecting the cells (74) from the charger (64).
    • 电池组(62)包括电池(74),并由提供电流电平的充电器(64)充电。 充电器(64)是典型的镍镉电池充电器,其提供超过最佳充电电流电平的第一充电电流电平。 电池组(62)还包括热敏元件(76)和具有过电流开关(78),电流检测电路(80),比较器电路(82)和温度信号开关(84)的过电流充电保护电路。 如果通过单元(74)的电流电平超过最佳充电电流电平,则电流感测电路(80)向比较器电路(82)提供信号,该电路致动温度信号开关(84),模拟热电池组。 然后,充电器(64)切换到不超过最佳充电电流电平的第二充电电流电平。 如果充电器(64)不改变电流水平,则在短时间之后,开关延迟(86)累积足够的电压以致动打开过电流开关(78)的驱动器开关(88),断开电池(74), 从充电器(64)。