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Led Lamp

  • US 6,348,766 B1
  • Filed: 11/06/2000
  • Issued: 02/19/2002
  • Est. Priority Date: 11/05/1999
  • Status: Expired due to Term
First Claim
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1. A LED lamp system comprising:

  • an alternating current power source connecting portion for receiving an alternating current;

    a power source converting portion for receiving said alternating current and rectifying the received alternating current for generating a direct current power;

    LED group consisted of a plurality of LEDs and receiving a direct current power output from said power source converting portion, said LED group having a life time preannouncement portion for integrating power supply period for issuing preannouncement indicative of approaching to the end of the life, said life time preannouncement portion including;

    counting means for measuring said power supply period on the basis of a frequency of the alternating power source, integrating means for integrating the power supply period measured by said counting means and storing the integrated value in a non-volatile memory, and power supply mode control means for controlling illumination of LEDs at different modes including a normal lighting modes, said power supply mode control means being responsive to an integrated value of said integrating means in excess of a predetermined criterion to operate in a predetermined life time preannouncement mode.

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