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1. 发明授权

US5283474A Circuit for driving a load by using selectively one of two different DC power sources 失效
标题翻译：通过选择性地使用两个不同直流电源之一来驱动负载的电路
公开(公告)号：US5283474A
公开(公告)日：1994-02-01
申请号：US720668
申请日：1991-06-25
申请人： Kunio Oi , Makoto Kawaguchi , Takashi Satoi
发明人： Kunio Oi , Makoto Kawaguchi , Takashi Satoi
IPC分类号： H03K17/18 , H03K17/22 , H03K17/945 , H02J3/02
CPC分类号： H03K17/22 , H03K17/18 , H03K17/945 , Y10T307/336 , Y10T307/367 , Y10T307/766
摘要： A circuit of a detection switch for generating an output signal for driving a load device in accordance with the detection result by a detector is composed with a reduced number of components externally attached to an IC substrate which mounts integrally main circuit units such as a power source circuit unit, a detection circuit unit and an output circuit unit. The output circuit unit comprises a comparator which compares a judgment signal from the detection circuit unit with a reference signal when the load device is driven by DC power, or compares the voltage of an external DC power source with a predetermined voltage when the device driven by AC power, and an output driver which generates a driving signal for the load device in response to the output signal from the comparator. The detection circuit unit produces the judgment signal only when either the output circuit unit or the power source circuit unit is active. Further, the output circuit unit comprises an NPN output circuit with a protection function for load short-circuit breaks its current path based on the judgment signal and a switching output circuit operating in engagement with the NPN output circuit. A limiter and a switching circuit are provided between the NPN output circuit and the load device. The limiter supplies the NPN output circuit with an excess current exceeding a predetermined value flowing through the load device and the switching circuit controls the limiter in accordance with the output from the switching output circuit. Further, the detection switch circuit is connected with a display lamp for displaying the operation of the switch, and the output circuit unit has a selector for selecting the judgment signal or the output signal for display according to the connection of an external jumper.
摘要翻译：用于根据检测器的检测结果产生用于驱动负载装置的输出信号的检测开关的电路由外部附接到IC基板的少量部件组成，该IC基板一体地安装有主电路单元，例如电源电路单元，检测电路单元和输出电路单元。输出电路单元包括比较器，当负载装置被直流电驱动时，将来自检测电路单元的判断信号与参考信号进行比较，或者当外部直流电源的电压与预定电压进行比较时， AC电源以及响应于来自比较器的输出信号产生用于负载装置的驱动信号的输出驱动器。只有当输出电路单元或电源电路单元都有效时，检测电路单元产生判断信号。此外，输出电路单元包括具有用于负载短路的保护功能的NPN输出电路，其基于判断信号而破坏其电流路径，以及与NPN输出电路接合操作的开关输出电路。在NPN输出电路和负载装置之间设有限幅器和开关电路。限幅器为NPN输出电路提供超过流过负载装置的预定值的过电流，开关电路根据开关输出电路的输出控制限幅器。此外，检测开关电路与用于显示开关的操作的显示灯连接，并且输出电路单元具有用于根据外部跳线的连接来选择判断信号或用于显示的输出信号的选择器。

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