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Automatic adjusting method for LED (Light Emitting Diode) luminous flux

A technology of automatic adjustment and luminous flux, applied in the direction of light source, electric light source, lighting device, etc., can solve the problems of super bright light distribution and substandard light distribution, and achieve the effect of increasing luminous flux, convenient and timely control

Inactive Publication Date: 2013-04-17
CHANGZHOU XINGYU AUTOMOTIVE LIGHTING SYST CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in car lights or some LED lamps exposed to the environment, although the heat dissipation part is done well, it is greatly affected by external heat, such as ambient temperature, sunlight or the light bulbs in the car lights affect the work of the LEDs in the lamps. Temperature has a great influence, for example, when the control temperature is low, the light distribution will be super bright; and when the control temperature is high, the light distribution will not meet the standard

Method used

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  • Automatic adjusting method for LED (Light Emitting Diode) luminous flux
  • Automatic adjusting method for LED (Light Emitting Diode) luminous flux
  • Automatic adjusting method for LED (Light Emitting Diode) luminous flux

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Embodiment Construction

[0024] The LED luminous flux automatic adjustment method of the present invention,

[0025] (1) Establish the linear relationship between the luminous flux output by the LED and the LED operating temperature and the linear relationship between the duty cycle of the PWM signal and the luminous flux output by the LED, and store them in the controller. The linear relationship between the luminous flux output by the LED of the present invention and the LED operating temperature Relational expression:

[0026]

[0027] Where: t is the LED operating temperature, t is between -40°C and 80°C,

[0028] I (t) is the output luminous flux at the LED working temperature t,

[0029] I(0°C) is the luminous flux output when the LED operating temperature t is 0°C,

[0030] I (25℃) is the output LED luminous flux when the LED operating temperature t is 25°C,

[0031] I(-40°C) is the output luminous flux when the LED working temperature t is at -40°C,

[0032] I(80°C) is the output lumi...

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Abstract

The invention relates to an automatic adjusting method for LED (Light Emitting Diode) luminous flux, which comprises the following steps that: a linear relation between luminous flux output by an LED and the working temperature of the LED and a linear relation between the duty cycle of PWM (Pulse Width Modulation) signals and the luminous flux output by the LED are established and stored in a controller, a temperature sensor reads the working temperature t of the LED and inputs the working temperature t of the LED into the controller, the controller obtains the duty cycle N(t)% of the PWM signals according to the working temperature of the LED, the controller outputs the duty cycle of the PWM signals to a driver and the driver controls the make and break of an LED circuit to automatically adjust the LED luminous flux. With the change of the temperature of the LED, the duty cycle of the PWM signals of LED drive current is changed to change the brightness of the LED.

Description

technical field [0001] The invention relates to a method for automatically adjusting LED luminous flux, and belongs to the technical field of LED vehicle lamp control. Background technique [0002] With the continuous development of LED (Light Emitting Diode) technology, the application of LED is becoming more and more extensive, especially in the field of automotive lights and lighting engineering. However, due to reasons such as the application environment and self-heating of the LED, the working temperature of the LED will be inconsistent, which will affect the output luminous flux. [0003] At present, the research on the influence of LED operating temperature on LED luminous flux mainly focuses on how to suppress light decay when the temperature is too high, and mainly adopts various heat dissipation methods to reduce the LED operating temperature. However, in car lights or some LED lamps exposed to the environment, although the heat dissipation part is done well, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 张立任康成戴笠笠
Owner CHANGZHOU XINGYU AUTOMOTIVE LIGHTING SYST CO LTD
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