公开(公告)号：DE69019746T2

公开(公告)日：1996-01-25

申请号：DE69019746

申请日：1990-08-29

Applicant: IBM

Inventor： FERMIER YVAN ,  FERRY MICHEL ,  JACQUART CHRISTIAN ,  VACHEE PIERRE

IPC: G06F1/30 ,  H02H3/08 ,  H02H3/087 ,  H02J13/00

Abstract: 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.

公开(公告)号：DE69019746D1

公开(公告)日：1995-06-29

申请号：DE69019746

申请日：1990-08-29

Applicant: IBM

Inventor： FERMIER YVAN ,  FERRY MICHEL ,  JACQUART CHRISTIAN ,  VACHEE PIERRE

IPC: G06F1/30 ,  H02H3/08 ,  H02H3/087 ,  H02J13/00

Abstract: 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.