公开(公告)号：US5299087A

公开(公告)日：1994-03-29

申请号：US731593

申请日：1991-07-17

申请人： Yvan Fermier ,  Michel Ferry ,  Christian Jacquart ,  Pierre Vachee

发明人： Yvan Fermier ,  Michel Ferry ,  Christian Jacquart ,  Pierre Vachee

IPC分类号： G06F1/30 ,  H02H3/08 ,  H02H3/087 ,  H02J13/00 ,  H02H3/093

CPC分类号： H02H3/087 ,  H03F2200/426

摘要： The overload protection circuit 12 comprises a resistor bridge 20 with a low impedance sensing resistor r and high impedance resistors R1 to R4 which generates voltages Va and Vb at the inputs 32 and 34 of a comparator 22. Voltage Vb depend upon the value of the load current so that the comparator provides at its output 36 a control signal for opening the switching device 24 comprising a field effect transistor when the load current exceeds a maximum value. Resistor R5 reinforces the effect of the control signal. This circuit can be used in a system which comprises a central power supply unit 8 which powers a plurality of devices such as 4. The status of the circuit 12 is reported to the system 8 though line 14 and circuit 12 comprises a control circuit 26 which is responsive to set and reset control signals on lines 14 and 18 from the unit 8 to close or open the switch 26.

摘要翻译： 过载保护电路12包括具有低阻抗感测电阻器r的电阻器桥20和在比较器22的输入端32和34处产生电压Va和Vb的高阻抗电阻器R1至R4。电压Vb取决于负载的值 使得比较器在其输出端36提供用于在负载电流超过最大值时打开包括场效应晶体管的开关器件24的控制信号。 电阻R5加强了控制信号的影响。 该电路可以用于包括对多个设备（例如4）供电的中央电源单元8的系统中。电路12的状态通过线路14被报告给系统8，电路12包括控制电路26，控制电路26 响应于来自单元8的线路14和18上的设置和复位控制信号以关闭或打开开关26。