Bias control circuit for light-emitting diode having...

Details Bias control circuit for light-emitting diode having... Bias control circuit for light-emitting diode having...

H - Electricity

05

B

328/114, 328/199

H05B 33/08 (2006.01) A61B 5/024 (2006.01) H03K 17/78 (2006.01)

Patent

CA 1194937

Abstract. A bias control circuit for a light-emitting diode having compensation of the light output at changing temperature, in which the light-emitting diode (led) used as temperature sensor is taken up together with a series resistor (R3) in a series circuit to which a fixed supply voltage is applied. A further series circuit of two resistors (R1, R2) having strongly different values is connected parallel across the series resistor (R3) and a differential amplifier (A1) is provided, the one and the other input of which are connected respectively to the junction of the two resistors (R1, R2) and to a setting voltage (Vi), and the output of which is connected to a control means (Tr1) taken up in series with the one series circuit.

421172

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