Sequential connector

Electrical transmission or interconnection systems – Plural supply circuits or sources

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Details

361 58, H01R 909

Patent

active

052685926

ABSTRACT:
A circuit for facilitating hot plugging by limiting the inrush current when a card is plugged into a board having plural card-receiving slots. A single MOSFET charging circuit for all of the cards is provided on the board for each voltage level supplied to the cards. Each card connector half has a staggered set of pins so that, upon insertion of a card, the following events occur in sequence (1) the card ground is connected to the board ground through a high-resistance path; (2) the card ground is connected to board ground through a low-resistance path and the MOSFET source is coupled to the card components; (3) the MOSFET gate is coupled through a card jumper to a bias supply; (4) the normal connection is made between the voltage supply and the card components; and (5) the connection to the card components from the MOSFET source is broken.

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IBM Technical Disclosure Bulletin, vol. 34, No. 4A, Sep. 1991, pp. 9-10, `Hot-Plug Circuit`.
Ellis, "Replacing a Power Supply Under Microprocessor Control in an Operating System", IBM Technical Disclosure Bulletin (IBM TDB), May 1985, pp. 7239.sub.]7241.
Badaoui et al., "Circuit Allowing Card Hot Plugging and Unplugging", IBM TDB, Nov. 1988, pp. 125-127.
Kisacky et al., "Charge Controller for Power-On Plugging and Unplugging of Electronic Components", IBM TDB, Aug. 1990, pp. 244-246.

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