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Personal Computer Menu Card International Association - Compatible Battery and Charging Cards

IP.com Disclosure Number: IPCOM000105746D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 4 page(s) / 118K

Publishing Venue

IBM

Related People

Beatty, B: AUTHOR [+2]

Abstract

Disclosed is a small computer system including an internal battery and an external power card which is plugged into a Personal Computer Menu Card Int'l. Ass'n. (PCMCIA) card slot having three additional contacts to provide for the external power function. One type of external power card, which provides power for the operation of the system but not for charging the internal battery, includes a disposable battery or a rechargeable battery. Another type of power card, which provides power for the system and for charging the internal battery of the system, includes a battery-charging circuit connected to line voltage through a low voltage transformer, or to a 12-volt direct-current source through an auto adapter.

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Personal Computer Menu Card International Association - Compatible Battery and Charging Cards

      Disclosed is a small computer system including an internal
battery and an external power card which is plugged into a Personal
Computer Menu Card Int'l.  Ass'n.  (PCMCIA) card slot having three
additional contacts to provide for the external power function.  One
type of external power card, which provides power for the operation
of the system but not for charging the internal battery, includes a
disposable battery or a rechargeable battery.  Another type of power
card, which provides power for the system and for charging the
internal battery of the system, includes a battery-charging circuit
connected to line voltage through a low voltage transformer, or to a
12-volt direct-current source through an auto adapter.

      Figure 1 shows a battery card 1, which has been configured to
fit within a slot provided for a standard PCMCIA card.  Present
technology can create a rechargeable battery in the form of a thin
sheet, similar to the non-rechargeable battery used in film packs for
many Polaroid cameras.  The costs are now low enough, and the battery
power density, in watt-hours per kilogram, has increased to a point
at which it is feasible to operate a small computer system with this
technology as an optional additional power source.  The terminals of
a battery (not shown) within the case of card 1 are electrically
connected to a pair of contact pads 2 near an edge of the case.  An
adjacent end 3 has provisions for fitting in a slot of this kind,
such as a keyslot 4 and a number of clearance holes 5 for receiving
the pins extending from a standard PCMCIA connec- tor.  Card 1 is
preferably configured to PCMCIA standards, having a length of 85.6
mm, a width of 54.0 mm, and a thickness of either 3.3 mm or 5.0 mm.
The battery within card 1 may be built as a non-rechargeable
thin-sheet battery, or it may alternately be a rechargeable battery.
When the volumes of standard batteries are compared with the volume
of a card configured to PCMCIA standards, it becomes apparent that
the energy stored in 4.3 AAA batteries, or in about two AA batteries,
can be stored in such a card.  Furthermore, this approach does not
waste volume in the manner of the commonly-used approach of placing a
cylindrical battery in a cavity having a square cross-section.

      Figure 2 shows an alternative battery card 6, which includes a
contact section 7 having a shape built in accordance with...