Patent ID: 9372122
Filing Date: 2016-06-21
CPC Classification: G01K,H05B

Claim Text:
1. An electronic circuit to monitor a temperature of a light emitting diode, comprising: a current generating circuit to generate a current flow of at least a first and second current through the light emitting diode, the at least first and second current being different from each other and respectively having a level which is lower than an operating current to operate the light emitting diode to emit light; and a voltage monitoring circuit to monitor a voltage of the light emitting diode, wherein the voltage monitoring circuit comprises a voltage metering circuit to determine a first voltage of the light emitting diode while driving the first current through the light emitting diode and to determine a second voltage of the light emitting diode while driving the second current through the light emitting diode, and wherein the voltage monitoring circuit comprises a calculating circuit to determine a difference of the first and a second voltage of the light emitting diode to monitor the temperature of the light emitting diode.