公开(公告)号：US06424513B1

公开(公告)日：2002-07-23

申请号：US09575930

申请日：2000-05-23

申请人： Daniel Wissell ,  Denise McAuliffe ,  Bernard Nolan

发明人： Daniel Wissell ,  Denise McAuliffe ,  Bernard Nolan

IPC分类号： H02H300

CPC分类号： H02H3/247 ,  H02H3/093 ,  H02H3/44

摘要： A short circuit protection device, which includes a comparator with a non-inverting input port, an inverting input port, and an output port, is used with first and second voltage reference signals obtained from a power supply to indicate a short-circuit condition in the power supply when the reference signals are the same. A first voltage divider is connected to the power plane of the power supply and provides the first reference signal to the non-inverting input port, and a second voltage divider is connected to the output port of the power supply and provides the second reference signal to the inverting input port, where the second reference signal is normally smaller than the first reference signal. A first time constant between the first voltage divider and the non-inverting input port provides a first time delay to the first reference signal, and a second time constant between the second voltage divider and the inverting input port provides a second time delay to the second reference signal, where the second time delay is greater than the first time delay. When a short-circuit condition occurs, the voltage levels of the reference signals become the same, changing the status signal at the comparator output port and, optionally, signaling a power-down of the power supply.

摘要翻译： 包括具有非反相输入端口的比较器，反相输入端口和输出端口的短路保护装置用于从电源获得的第一和第二电压参考信号，以指示短路状况 当参考信号相同时，电源。 第一分压器连接到电源的电源平面，并将第一参考信号提供给非反相输入端口，第二分压器连接到电源的输出端口，并将第二参考信号提供给 反相输入端口，其中第二参考信号通常小于第一参考信号。 第一分压器和非反相输入端口之间的第一时间常数为第一参考信号提供第一时间延迟，并且第二分压器和反相输入端口之间的第二时间常数向第二分配器提供第二时间延迟 参考信号，其中第二时间延迟大于第一时间延迟。 当发生短路情况时，参考信号的电压电平变得相同，改变比较器输出端口处的状态信号，并且可选地发出指示电源掉电的信号。