Overload protection circuit

Details Overload protection circuit Overload protection circuit

1991-07-17

1994-03-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, 361 97, 361 87, H02H 3093

Patent

active

052990877

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.

REFERENCES:
patent: 4241372 (1980-12-01), Sears
patent: 4494162 (1985-01-01), Eyler
patent: 4849850 (1989-07-01), Brahms
patent: 4977477 (1990-12-01), Babico et al.

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