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US 9,000,687 B2Granted
Method for mixing light of LEDs and lighting device using same
AssigneeHon Hai Precision Industry Co., Ltd.
InventorChih-Chen Lai
Life of this patent
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Abstract
A method for mixing light of LEDs includes following steps: Firstly, a substrate with a red light LED, a green light LED and a blue light LED arranged thereon is provided. Secondly, a power source for supplying power to the red light LED, the green light LED and the blue light LED is provided. Thirdly, a temperature variation ΔT1 of the red light LED caused by the power source, a temperature variation ΔT2 of the green light LED caused by the power source, a temperature variation ΔT3 of the blue light LED caused by the power source are calculated. And finally, input currents applied to the red light LED, the green light LED and the blue light LED are adjusted according to the temperature variations ΔT1, ΔT2 and ΔT3. A lighting device using the method is also provided.
Claims7
A method for mixing light of LEDs, comprising following steps:
- providing a substrate with a red light LED, a green light LED and a blue light LED arranged thereon;
- providing a power source for supplying power for the red light LED, the green light LED and the blue light LED;
- calculating a temperature variation ΔT1 of the red light LED caused by the power source, a temperature variation ΔT2 of the green light LED caused by the power source, and a temperature variation ΔT3 of the blue light LED caused by the power source;
- and
- adjusting input currents applied to the red light LED, the green light LED and the blue light LED according to the temperature variations ΔT1, ΔT2 and ΔT3;
- wherein before calculating the temperature variation ΔT1 of the red light LED, the temperature variation ΔT2 of the green light LED and the temperature variation ΔT3 of the blue light LED, an amount of heat Q1 of the red light LED generated by the power source, an amount of heat Q2 of the green light LED generated by the power source, and an amount of heat Q3 of the blue light LED generated by the power source are calculated, the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to the amounts of heat Q1, Q2 and Q3;
- and
- wherein a thermal resistance RR of the red light LED, a thermal resistance RG of the green light LED, and a thermal resistance RB of the blue light LED are provided, and the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to following expression:
- ΔT1=Q1*RR;
- ΔT2=Q2*RG;
- ΔT3=Q3*RB.
8 more elements
A lighting device, comprising:
- a lighting module, comprising a substrate and a red light LED, a green light LED and a blue light LED formed on the substrate;
- a power source, supplying power for the red light LED, the green light LED and the blue light LED respectively;
- and
- a control module, electrically connected with the lighting module and the power source, the control module calculating a temperature variation ΔT1 of the red light LED caused by the power source, a temperature variation ΔT2 of the green light LED caused by the power source, a temperature variation ΔT3 of the blue light LED caused by the power source, and adjusting input currents to the red light LED, the green light LED and the blue light LED according to the temperature variations ΔT1, ΔT2 and ΔT3;
- wherein before calculating the temperature variation ΔT1 of the red light LED, the temperature variation ΔT2 of the green light LED and the temperature variation ΔT3 of the blue light LED, an amount of heat Q1 of the red light LED generated by the power source, an amount heat Q2 of the green light LED generated by the power source, and an amount of heat Q3 of the blue light LED generated by the power source are calculated, the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to the amounts of heat Ql, Q2 and Q3;
- and
- wherein a thermal resistance RR of the red light LED, a thermal resistance RG of the green light LED, and a thermal resistance RB of the blue light LED are provided, the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to following expression:
- ΔT1=Q1*RR;
- ΔT2=Q2*RG;
- ΔT3=Q3*RB.
7 more elements
A method for mixing light of red, green and blue LEDs, comprising following steps:
- providing the red, green and blue LEDs and applying input currents to the red, green and blue LEDs to drive the red, green and blue LEDs to generate light beams which are mixed together to generate white light;
- calculating a temperature variation ΔT1 of the red light LED, a temperature variation ΔT2 of the green light LED, and a temperature variation ΔT3 of the blue light LED;
- and
- adjusting the input currents applied to the red light LED, the green light LED and the blue light LED according to the temperature variation ΔT1, ΔT2 and ΔT3;
- wherein before calculating the temperature variation ΔT1 of the red light LED, the temperature variation ΔT2 of the green light LED and the temperature variation ΔT3 of the blue light LED, an amount of heat Q1 of the red light LED, an amount of heat Q2 of the green light LED, and an amount of heat Q3 of the blue light LED are calculated, the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to the amounts of heat Q1, Q2 and Q3;
- and
- wherein a thermal resistance RR of the red light LED, a thermal resistance RG of the green li ht LED and a thermal resistance RB of the blue light LED are provided, and the temperature variations ΔT1, ΔT2 and ΔT3 are calculated according to following expression:
- ΔT1=Q1*RR;
- ΔT2=Q2*RG;
- ΔT3=Q3*RB.
7 more elements
Dependencies are inferred from the claim text.