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Method and apparatus for supplying a power source to an electronic apparatus

  • US 5,764,031 A
  • Filed: 08/18/1997
  • Issued: 06/09/1998
  • Est. Priority Date: 08/25/1993
  • Status: Expired due to Fees
First Claim
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1. A power source supplying method for supplying a power source voltage to an electronic apparatus having a main body portion to which the power source voltage is supplied by a built-in battery within said main body portion or an externally attached battery within an externally attached controller unit mounted on said main body portion, the method comprising:

  • detecting a voltage of said built-in battery;

    comparing the detected voltage of said built-in battery and a first predetermined value while said power source voltage is supplied to said main body portion by said externally attached battery;

    detecting a voltage of said externally attached battery;

    comparing the detected voltage of said externally attached battery and a second predetermined value;

    storing in a memory means an indication when said externally attached battery is determined to have a voltage below said second predetermined value;

    controlling whether said built-in battery or said externally attached battery supplies said power source voltage to said main body portion,wherein said controlling includes interrupting said externally attached battery from providing said power source voltage and causing said built-in battery to supply said power source voltage when the voltage of the built-in battery is determined to be equal to or greater than said first predetermined value, andfurther wherein said controlling includes preventing said externally attached battery from attempting to supply said power source voltage to said main body portion when said memory means contains said indication that said externally attached battery was determined to have a voltage below said second predetermined voltage; and

    displaying whether said built-in battery or said externally attached battery is supplying a power source voltage to said main body portion.

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