Intelligent power supply system for a portable computer

  • US 5,300,874 A
  • Filed: 09/20/1990
  • Issued: 04/05/1994
  • Est. Priority Date: 09/29/1989
  • Status: Expired due to Term
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First Claim
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1. An intelligent power supply system for a portable computer, the computer being operable in response to power supplied to a power input from at least two rechargeable batteries or an alternating current (AC) adapter, comprising:

  • means for receiving each of said batteries in a respective one of at least two battery receiving sides of a battery receiving section within said computer;

    means, coupled to said receiving means, for latching each of said batteries into a respective one of said battery receiving sides;

    means for providing selection information indicating which one of said battery receiving sides has been used to supply power to said power input before power-up of said portable computer;

    selecting means for selecting one of said battery receiving sides indicated by said selection information;

    detection means, responsive to said selecting means, for detecting whether the selected battery receiving side latches one of said batteries, and whether a charge of a battery latched by said selected battery receiving side is above a predetermined level;

    control means, responsive to said detection means, for indicating the selected battery receiving side in the event that said selected battery receiving side latches one of said batteries and the charge of the battery latched in said selected battery receiving side is above said predetermined level; and

    battery control circuit means, responsive to said control means, for supplying power to said power input from a battery receiving side indicated by said control means.

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