Browse Prior Art Database

Hot Plug Receptacle Actuated Mechanical Latch

IP.com Disclosure Number: IPCOM000122255D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Gruber, HW: AUTHOR [+4]

Abstract

The concept described in this article prevents large current surges and arcing during function insertion or removal in a digital system, without requiring a complete shut-down of the power supplied to the system and is especially useful where circuit cards are to be added or removed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 56% of the total text.

Hot Plug Receptacle Actuated Mechanical Latch

      The concept described in this article prevents large
current surges and arcing during function insertion or removal in a
digital system, without requiring a complete shut-down of the power
supplied to the system and is especially useful where circuit cards
are to be added or removed.

      Card assembly insertion and removal levers are used to generate
a signal which electronically disconnects the card and tells the
system that the card is going to be replaced. A lever-attached magnet
operates a reed-relay or another form of transducer by which a signal
is generated when the levers are opened or closed.

      A hot plug receptacle, activating a mechanical latch for
temporary power and signal connection to the card (during removal and
insertion), allows card removal or lifting of the levers only after
the hot plug connector has been inserted.  The receptacle is mounted
to the back side of the card.

      For removing a card, the hot plug power/signal connector is
plugged into the hot plug receptacle.  A mechanical latch releases
the insertion/removal levers to be activated for card removal.
Activation of the levers generates an interrupt signal telling the
system that the card is going to be removed and any action thereon
has to stop immediately.  It also sets all signal line drivers to a
high state, so that unplugging the card does not disturb the bus.
The hot plug connector also provides power in par...