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Diagnostic system for an LED lamp for a motor vehicle

  • US 6,490,512 B1
  • Filed: 11/05/1999
  • Issued: 12/03/2002
  • Est. Priority Date: 11/13/1998
  • Status: Expired due to Fees
First Claim
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1. A diagnostic system of an LED-lamp for a motor vehicle comprising:

  • the LED lamp including an LED matrix having a plurality of LEDs connected in a circuit, a control circuit for controlling and monitoring the LEDs of the matrix, and a diagnostic circuit connected to the control circuit for generating an error signal in case of malfunction;

    a light control module for connecting the LED lamp to an operating voltage source (UB) and monitoring a current consumption of the LED lamp;

    wherein, in case of malfunction of the LED lamp, the diagnostic circuit is for modulating in different manners the current consumption of the LED lamp by using a switchable current sink (Tr, R1), each manner of modulation depending on a type of malfunction that has occurred, and wherein the light control module is for converting the modulated current consumption into voltage signals and for recognizing the types of malfunctions that have occurred from the voltage signals.

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