Browse Prior Art Database

Electronic Card "Hot" Insertion PreCharge Complete Detector

IP.com Disclosure Number: IPCOM000106374D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 32K

Publishing Venue

IBM

Related People

Ouchi, NK: AUTHOR

Abstract

Disclosed is a mechanism for electronic card insertion into active circuits that may require a current precharge. The mechanism indicates when the card is charged and can be inserted into its final position.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Electronic Card "Hot" Insertion PreCharge Complete Detector

      Disclosed is a mechanism for electronic card insertion into
active circuits that may require a current precharge.  The mechanism
indicates when the card is charged and can be inserted into its final
position.

      For card insertion into active circuits, the card may have to
be precharged so that the power and signal circuits do not disrupt
the system by causing a large current drain.  The pre-charge is done
thru high resistance pins.  This disclosure describes a mechanism
that detects when the card is pre-charged and can be then fully
inserted.  The Figure illustrates a voltage comparison circuit that
compares the voltage across a capacitor against a reference voltage.
The capacitor is charged thru resistive pins and is a measure of the
precharging of the  other circuits on the card.  When the capacitor
reaches the reference voltage, a light or LED is gated on and the
card can be fully inserted.