Hot-plugging circuit for the interconnection of cards to boards

Details Hot-plugging circuit for the interconnection of cards to boards Hot-plugging circuit for the interconnection of cards to boards

1991-11-12

1993-12-21

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361111, 323908, H02H 900

Patent

active

052725847

ABSTRACT:
A hot plug circuit insuring that the plugging of cards to a board is performed in the hot-plug mode when the cards are supplied from a common power supply located on one of the cards or on the board. This circuit (62) limits the surge current generated at the interconnection of first circuits (30) arranged on a first card (1) and powered by a supply device (2) providing a first supply voltage (ground) on a first supply line (36) and a second supply voltage (+V) on a second supply line (34), with second circuit (24) on a second card powered by the supply device (2) through a third supply line (74) and fourth supply line (76). The surge current results from the charge of a decoupling capacitor of capacitance Cd arranged on the second card between the third and fourth supply lines when the cards are interconnected through an interconnecting arrangement (14, 12, 22). The hot plug circuit comprises a controlled ramp generation device connected to the first and second supply lines and activated when the connection between the first and third supply line is completed through the connecting arrangement to start the generation on the fourth supply line of a first ramp voltage Vb derived from the voltages on the first and second supply lines, said ramp voltage having an adjustable slope a=dVb/dt, whereby the surge current i which is equal to a.Cd can be limited to a desired value by adjusting the slope value a.

REFERENCES:
patent: 4245270 (1981-01-01), Busby
patent: 5077675 (1991-12-01), Tam
IBM Technical Disclosure Bulletin, vol. 32, No. 2, Jul. 1989, pp. 318-320.

Affiliated with

Also associated with

Rating

Hot-plugging circuit for the interconnection of cards to boards does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hot-plugging circuit for the interconnection of cards to boards, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hot-plugging circuit for the interconnection of cards to boards will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-312702