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    • 11. 发明申请
    • METHOD AND APPARATUS FOR PROVIDING UNDER VOLTAGE PROTECTION FOR LIFEPO4 BATTERY
    • 用于提供LIFEPO4电池电压保护的方法和装置
    • WO2012079220A1
    • 2012-06-21
    • PCT/CN2010/079751
    • 2010-12-14
    • NOKIA CORPORATIONLI, AllenZHANG, ChangjiangZHANG, TaoCHEN, Qi. MWU, Carol
    • LI, AllenZHANG, ChangjiangZHANG, TaoCHEN, Qi. MWU, Carol
    • H02H3/24
    • H02H7/18H02J7/0029H02J7/0047
    • A method and an apparatus for providing under voltage protection for a LiFePO 4 battery (320). The apparatus is coupled to the battery (320) at a first connection pin (Vbat) and a second connection pin (GND), and includes a voltage divider circuit configured to generate a variable voltage in response to the variation of the voltage of the battery (320), a diode (350) configured to shut down the voltage divider circuit when the voltage drops below a predefined minimum voltage, and a first transistor (370) configured to monitor the variable voltage of the voltage divider circuit and to set a second transistor (360) to be on or off. The second transistor (360) is configured to cut off the connection between the first connection pin (Vbat) and an outlet pin (345) to prevent further leakage current draining from the battery (320). An integrated circuit including the under voltage protection circuit coupled to the battery (320) at the first connection pin (Vbat) and the second connection pin (GND) is applied in a cell phone.
    • 一种用于为LiFePO 4电池(320)提供欠电压保护的方法和装置。 该装置在第一连接引脚(Vbat)和第二连接引脚(GND)处耦合到电池(320),并且包括分压电路,其被配置成响应于电池电压的变化而产生可变电压 (320),二极管(350),被配置为当所述电压下降到低于预定最小电压时关闭所述分压器电路;以及第一晶体管(370),被配置为监视所述分压器电路的可变电压并设置第二 晶体管(360)打开或关闭。 第二晶体管(360)被配置为切断第一连接引脚(Vbat)和出口引脚(345)之间的连接,以防止进一步从电池(320)漏出的漏电流。 包括在第一连接引脚(Vbat)和第二连接引脚(GND)处耦合到电池(320)的欠压保护电路的集成电路被应用在蜂窝电话中。