Inrush current limiting circuit

Details Inrush current limiting circuit Inrush current limiting circuit

1992-11-27

1994-02-01

Beha, Jr., William H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

323908, H02H 900

Patent

active

052837076

ABSTRACT:
An inrush current limiting circuit includes a power FET switch connected between power source and load and a control circuit. The power FET switch includes one or more parallel-connected power FETs, each having low individual conductive resistances. The control circuit, connected between the power inputs and the gate of power FET switch, includes a voltage supply for providing sufficient voltage to turn the power FET switch on and a time constant circuit for controlling the rate at which the power FET means is turned on. With the voltage supply connected to an optional enable terminal, a DC enable signal can control powering of the load. A second time constant circuit controls the rate of power down.

REFERENCES:
patent: 4908489 (1990-03-01), Panecki et al.
patent: 5010293 (1991-04-01), Ellersick
patent: 5079455 (1992-01-01), McCafferty et al.
patent: 5155648 (1992-10-01), Gauthier
"Slow Start Circuit," IBM Tech. Discl. Bul., vol. 32, No. 5B, pp. 407, 408, Oct. 1989.

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