Circuit for controlling current in an adapter card

Details Circuit for controlling current in an adapter card Circuit for controlling current in an adapter card

1993-12-21

1996-11-05

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 18, 361 9, H02H 900

Patent

active

055723950

ABSTRACT:
A circuit embodied within an adapter card for hot-plugging with a card slot in a card slot coupled to a processor based system utilizes a biasing circuit for ensuring that the input voltage to the load of the adapter card is of a sufficient magnitude. The circuit also includes a FET/feedback circuit for opening and closing the circuit provided between the input voltage to the adapter card and the load. This FET/feedback circuit operates as a constant current source to charge the input capacitance of the load and converts to a switched mode when the load capacitance is fully charged. The biasing circuit controls the FET/feedback circuit so that it remains open during hot-plugging of the adapter card into the card slot to alleviate pin arching. A monitor/timer circuit prevents the FET/feedback circuit from operating in the constant-current mode for no longer than a predetermined amount of time. A latch circuit is provided to turn off the FET within the FET/feedback circuit upon sensing of a transient current through the load.

REFERENCES:
patent: 3973817 (1976-08-01), Stalley et al.
patent: 3993935 (1976-11-01), Phillips et al.
patent: 4079440 (1978-03-01), Ohnuma et al.
patent: 4245270 (1981-01-01), Busby
patent: 4271460 (1981-06-01), Baker
patent: 4494064 (1985-01-01), Harkness
patent: 4510553 (1985-04-01), Faultersack
patent: 4614877 (1986-09-01), Knesewitsch et al.
patent: 4750099 (1988-06-01), Inone et al.
patent: 4849944 (1989-07-01), Matsushita
patent: 4867699 (1989-09-01), Oda et al.
patent: 4927382 (1990-05-01), Huber
patent: 5077675 (1991-12-01), Tam
patent: 5079455 (1992-01-01), McCafferty et al.
IBM Technical Disclosure Bulletin, vol. 33, No. 8, Jan. 1991 New York, US pp. 223-227, XP 000106938, "Direct Access Storage Device (DASD) Concurrent Maintenance".
Preliminary Data Sheet No. PO-6.018. International Rectifier. IR2121. "Current Limiting MOS Gate Driver." pp. 9-15 No Date.
IBM Technical Disclosure Bulletin. "Sequential Contact Mating." vol. 31, No. 10, Mar. 1989, pp. 284-285.

Affiliated with

Also associated with

Rating

Circuit for controlling current in an adapter card does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for controlling current in an adapter card, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for controlling current in an adapter card will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2019665