Device for protecting a direct current electrical power supply f

Details Device for protecting a direct current electrical power supply f Device for protecting a direct current electrical power supply f

1991-02-27

1992-10-13

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 11, 361 18, 361111, 323908, H04B 1502

Patent

active

051556480

ABSTRACT:
A device for protecting a direct current electrical power supply from disturbances caused by connecting to it or disconnecting from it an electronic system comprises at least one variable impedance component. The impedance of this component is controlled so that it has a very high first value when said electronic system is disconnected, a very low second value when said system is connected, a value varying slowly from said first value to said second value on changing from the disconnected state to the connected state and a value varying quickly from said second value to said first value on changing from the connected state to the disconnected state. The output current from said variable impedance component constitutes the supply current of said electronic system.

REFERENCES:
patent: 3912974 (1975-10-01), Hill
patent: 3968421 (1976-07-01), Marquade
patent: 4658320 (1987-04-01), Hongel
patent: 4814687 (1989-03-01), Walker
patent: 4891728 (1990-01-01), Preis et al.
Linear & Interface Circuits Application, vol. 1; by Pippenger et al., pp. 5-2 column 1, Texas Instruments.
IBM Technical Disclosure Bulletin, vol. 32, No. 2, Jul. 1989, pp. 318-320, Armonk, N.Y., USA; "Method of pre-charging logic card (decoupling) capacitors".

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