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1. 发明授权

US5444595A Load drive apparatus including power transistor protection circuit from overcurrent 失效
标题翻译：负载驱动装置包括功率晶体管保护电路不要过电流
公开(公告)号：US5444595A
公开(公告)日：1995-08-22
申请号：US311938
申请日：1994-09-26
申请人： Fukuo Ishikawa , Shuuichi Konishi , Katsumi Nakamura , Hideyuki Ikemoto , Toshio Ishida
发明人： Fukuo Ishikawa , Shuuichi Konishi , Katsumi Nakamura , Hideyuki Ikemoto , Toshio Ishida
IPC分类号： H03K3/0231 , H03K17/082 , H02H7/16
CPC分类号： H03K3/0231 , H03K17/0822
摘要： A load drive apparatus is used in a vehicle direction indicating apparatus operable free from overcurrents and overvoltage. The load drive apparatus includes: a charging/recharging capacitor; a charging/recharging circuit for charging/recharging the capacitor at a preselected time constant in such a manner that a voltage across the capacitor is varied between a preset upper limit voltage and a preset lower limit voltage; a drive circuit for turning ON a power transistor series-connected to a current path employed to supply a current from a DC power source to a load, thereby driving the load when the charging/discharging circuit causes the capacitor to be charged, or the voltage across the capacitor is higher than, or equal to a predetermined voltage defined between the upper limit voltage and the lower limit voltage; overcurrent judging means for judging whether or not a voltage across terminals of the power transistor connected to the above-described current path exceed an overcurrent judging voltage.
摘要翻译：在没有过电流和过电压的车辆方向指示装置中使用负载驱动装置。负载驱动装置包括：充电/再充电电容器; 充电/再充电电路，用于以预选的时间常数对电容器充电/再充电，使得电容器两端的电压在预设上限电压和预设下限电压之间变化; 用于接通串联连接到用于将电流从DC电源提供给负载的电流路径的功率晶体管的驱动电路，从而当充电/放电电路使电容器被充电时驱动负载，或者电压跨越电容器的电压高于或等于限定在上限电压和下限电压之间的预定电压; 用于判断连接到上述电流路径的功率晶体管的两端的电压是否超过过电流判定电压的过电流判断装置。

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