Patent ID: 6400102
Filing Date: 2002-06-04
Classification: G01R,H05B

Abstract:
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.