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Charging system of mobile telephone

  • US 6,377,826 B1
  • Filed: 03/26/1999
  • Issued: 04/23/2002
  • Est. Priority Date: 03/27/1998
  • Status: Expired due to Fees
First Claim
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1. A charging system of a mobile telephone in which the mobile telephone provides a lighting circuit for lighting a display and an operating section, and a secondary battery that is charged by a charger, wherein, said mobile telephone, comprising:

  • a power supply terminal for lighting;

    a change-over switch which connects either said power supply terminal for lighting or a battery connecting terminal to said lighting circuit; and

    a controller which changes said change-over switch to said power supply terminal for lighting by detecting that the mobile telephone is connected to said charger;

    wherein, said charger, comprising;

    a charging circuit providing a control means which implements charging with a predetermined charging current until the charged voltage of said secondary battery reaches to a predetermined charged voltage, and makes the charging current decrease with time passing by making the charged voltage a predetermined constant value after the charged voltage reached said predetermined voltage value, and controls to finish charging by detecting that said charging current reached the predetermined value; and

    a power supply for lighting which is provided as a separate line from the said charging circuit and is connected to said power supply terminal for lighting and supplies the current to said lighting circuit during the time that said charging circuit is charging said secondary battery.

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