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Browse Prior Art Database

Chattering Noiseless Docking Power Supply Control Method

IP.com Disclosure Number: IPCOM000118946D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Horikoshi, H: AUTHOR [+5]

Abstract

Disclosed is an apparatus, like a port replicator or a docking station, that embodies a chattering noiseless power supply sequence when the notebook Personal Computer (PC) is hot-docked to it.

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

Chattering Noiseless Docking Power Supply Control Method

      Disclosed is an apparatus, like a port replicator or a docking
station, that embodies a chattering noiseless power supply sequence
when the notebook Personal Computer (PC) is hot-docked to it.

      In this context, CVVCCC-2 is turned on after the notebook PC is
docked to the port replicator (or the docking station).  CVVCCC
stands for Constant Voltage Variable Current Constant Current.

      Fig. 1 shows the CVVCCC-2 power supply sequence timing
chart.  The "-Docked" signal is activated when the notebook PC is
hot-docked.  The gate of FET is turned on after the delay time (t1)
caused by a capacitor (C1) and a resister (R1).

      Fig. 2 shows a circuit which configures the delayed CVVCCC-2
power supply to the notebook PC after docking.