Patent ID: 8502479
Filing Date: 2013-08-06
Classification: H05B,Y02B

Abstract:
1. A current regulating circuit for connection in series between a light emitting diode (LED) and a power source, said current regulating circuit comprising: a first resistive unit having a first resistance that is proportional to an operation temperature of the LED when the operation temperature of the LED is above a predetermined threshold temperature; and a second resistive unit connected in series with said first resistive unit, and having a second resistance that is inversely proportional to the operation temperature of the LED when the operation temperature of the LED is above the predetermined threshold temperature; wherein when the operation temperature of the LED is above the predetermined threshold temperature, an effective resistance of said current regulating circuit attributed to said first and second resistive units is proportional to the operation temperature of the LED, and absolute value of a rate of change of the first resistance is larger than that of the second resistance.