Battery pack with a monitoring circuit for a known system

Details Battery pack with a monitoring circuit for a known system Battery pack with a monitoring circuit for a known system

1995-12-15

1997-06-24

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With measuring, testing, or indicating means

429 91, 429 96, 320 33, 320 39, 320 49, H01M 1048, H02J 704

Patent

active

056415877

ABSTRACT:
A removable battery pack for powering a pen-based or portable computer system in which the battery pack blocks its terminals when inserted into an unknown system. The known system includes a power supply microcontroller which passes battery charge data back and forth between a memory located in the battery pack and the power supply microcontroller. A battery microcontroller, located in the battery pack, eavesdrops drops on the communication between the power supply microcontroller and the memory, and when it validates a known signature of this communication, the battery microcontroller then enables the terminals of the battery pack. A trickle discharge current flows from the battery pack whenever the battery pack is out of the known system to allow the power supply microcontroller to power up in the case of a dead auxiliary battery.

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