Browse Prior Art Database

Power Meter in a Notebook PC

IP.com Disclosure Number: IPCOM000115757D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Narita, I: AUTHOR

Abstract

Disclosed is a power meter which is to be implemented into a Notebook PC. In the conventional Notebook PC, a user has to select an appropriate AC/DC adapter by taking the power consumption of the PC into consideration. However, it is relatively difficult, because the system generally includes several optional I/O devices and the whole power consumption of the PC is not definite nor fixed. Therefore, AC/DC adapter which can supply maximum power of the PC including all options and the heaviest software had been selected. This means that a user has to use relatively bigger AC/DC adapter even if the user does not use any options nor heavy software. But if a user can estimate the power consumption of the PC at his using environment, the user can select smaller and economic AC/DC adapter.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Power Meter in a Notebook PC

      Disclosed is a power meter which is to be implemented into a
Notebook PC.  In the conventional Notebook PC, a user has to select
an appropriate AC/DC adapter by taking the power consumption of the
PC into consideration.  However, it is relatively difficult, because
the system generally includes several optional I/O devices and the
whole power consumption of the PC is not definite nor fixed.
Therefore, AC/DC adapter which can supply maximum power of the PC
including all options and the heaviest software had been selected.
This means that a user has to use relatively bigger AC/DC adapter
even if the user does not use any options nor heavy software.  But if
a user can estimate the power consumption of the PC at his using
environment, the user can select smaller and economic AC/DC adapter.
According to the present invention, user can know the power
consumption and select the small AC/DC adapter.

      The Figure shows the block diagram of this invention.  A
voltage meter and a current meter are provided within the AC/DC
adapter.  One chip microprocessor monitors the current and voltage
data of the main battery.  Then, the microcomputer calculates the
power consumption of the whole system (DC/DC converter's loss is also
included in this) and the calculated value is written into the NV RAM
(non volatile RAM).  When the space of the NV RAM becomes small,
larger values of the power consumption will be kept in the NV RAM.
If the use...