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Non-linear light-emitting load current control

  • US 6,400,102 B1
  • Filed: 06/07/2001
  • Issued: 06/04/2002
  • Est. Priority Date: 12/23/1999
  • Status: Expired due to Term
First Claim
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1. A sensor circuit for detecting a current supplied to a non-linear light-emitting load and for producing a voltage signal dependent on a temperature of operation of the light-emitting load, said sensor circuit comprising:

  • c) first and second serially interconnected resistors also connected in series with the light-emitting load; and

    d) a variable impedance connected in parallel with one of said first and second resistors, said variable impedance having an impedance value which varies with the temperature of operation of the light-emitting load;

    whereby at least a portion of the current through the light-emitting load flows through the sensor circuit to enable said first and second serially interconnected resistors and said variable impedance to produce a variable voltage signal representative of the current flowing through the light-emitting load and dependent on said temperature of operation.

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