Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Charge System with CVCW+CC AC/DC Adapter

IP.com Disclosure Number: IPCOM000110530D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Narita, I: AUTHOR

Abstract

Disclosed is the charge system with CVCW+CC AC/DC adapter. The most typical system that this charge system applies to is a notebook PC which has the secondary battery and AC/DC adapter as the main power source. With this invention, the battery can be charged by CC (Constant Current) output during the system operation and can be quickly charged by CW (Constant Wattage) mode during power-off or suspend mode.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 80% of the total text.

Charge System with CVCW+CC AC/DC Adapter

       Disclosed is the charge system with CVCW+CC AC/DC
adapter.  The most typical system that this charge system applies to
is a notebook PC which has the secondary battery and AC/DC adapter as
the main power source.  With this invention, the battery can be
charged by CC (Constant Current) output during the system operation
and can be quickly charged by CW (Constant Wattage) mode during
power-off or suspend mode.

      Fig. 1 shows a 25 W CVCW+CC AC/DC adapter's characteristics.
The CVCW (Constant Voltage Constant Wattage) outputs CV (Constant
Voltage, 20 V in this case) normally.  But, when the output is
clamped by the battery voltage, it outputs CW (Constant Wattage, 25 W
in this case), and the battery is charged by the CW.

      Fig. 2 shows the charge system with the CVCW+CC AC/DC adapter.
When the battery is charged during the system (notebook PC)
operation, CC is controlled by the CC ON signal being high and CC is
output.  And QUICK CHARGE signal is high and the P MOS is off.  In
this case, the battery is charged by the CC (0.48 A in this case)
output.  When the battery is fully charged, CC ON signal becomes low
and the CC output stops.

      When the battery is charged during the power off or suspend
mode, QUICK CHARGE     signal becomes low, and the P MOS becomes on
and the CVCW output becomes CW mode because the output is clamped by
the battery voltage, and the battery is charged by the CW. ...