Overload protection circuit capable of sustaining high inrush cu

Details Overload protection circuit capable of sustaining high inrush cu Overload protection circuit capable of sustaining high inrush cu

1992-09-10

1994-04-12

Beha, Jr., William H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

323908, H02H 3087

Patent

active

053031148

ABSTRACT:
This overload protection circuit capable of sustaining high capacitive load or any other load which may create an important inrush current, comprises a differential bridge composed of high impedance measuring resistors (R1, R1' R3, R3'), a low impedance sensing resistor (R2), and a timing and control circuit (20) including a transistor (T2), a capacitor (C1) and resistors that controls a switch (T1) and limits the inrush current of the subcircuit capacitor by slowing the closing of the switch. In case of defaults, the switch will be opened fast enough to minimize the fault transient transfer from down-stream to up-stream of the protection circuit. In addition, a comparator (32) associated to a resistor (R31) providing an hysteresis enables to avoid the oscillations in the region of the system transition from on to off states and vice versa. This circuit can be used in a system which comprises a secondary power supply unit (9) which powers a plurality of subcircuits (22).

REFERENCES:
patent: 3729671 (1973-04-01), Jeffery
patent: 5063471 (1991-11-01), Park
patent: 5187653 (1993-02-01), Lorenz
IBM Technical Disclosure Bulletin, vol. 32, No. 5B, Oct. 1989, p. 407 "Slow Start Circuit".

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