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Method and apparatus for measuring thermal characteristic of LED

A technology of light-emitting diode and thermal characteristics, which is applied in the field of measurement of light-emitting diode thermal characteristics, can solve problems such as long measurement time, reduced accuracy, and poor practicability, and achieve real-time measurement, improve accuracy, and shorten measurement time.

Active Publication Date: 2014-08-20
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

At present, the temperature rise curve of light-emitting diodes is mainly measured by the above-mentioned static calibration-dynamic measurement method. The temperature rise curve obtained by this method ignores the influence of current switching on the junction temperature, which reduces the accuracy, and because the measurement time is too long making it less practical

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  • Method and apparatus for measuring thermal characteristic of LED
  • Method and apparatus for measuring thermal characteristic of LED
  • Method and apparatus for measuring thermal characteristic of LED

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Embodiment Construction

[0026] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0027] According to an embodiment of the present invention, the device for measuring the thermal characteristics of a light emitting diode includes a pulse constant current control circuit, a data collector and a temperature control unit, wherein the pulse constant current control circuit is connected to the light emitting diode to provide a driving current for the light emitting diode, so that the light emitting diode can The current pulse or working current is fed in; the temperature control unit is used to control the ambient temperature of the light-emitting diode; the data collector is connected to the pulse constant current control circuit and the light-emitting diode, and is used to collect the current and voltage value of the light-emitting diode.

[0028] Such as image 3 Shown, be the example of measuring LED therma...

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Abstract

The invention discloses a method and apparatus for measuring the thermal characteristic of an LED. The method comprises a dynamic scaling phase and a static measuring phase. In the dynamic scaling phase, the LED is respectively placed in different environment temperatures for introduction of current pulses for many times to measure the voltage current characteristic curve of the LED at the different temperatures; and in the static measuring phase, working currents are introduced to the LED, the voltages and current values of the LED are measured, and the temperature rise curve of the LED is solved through combination with the voltage current characteristic of the LED at the different temperatures. The apparatus for measuring the thermal characteristic of the LED comprises a pulse constant current control circuit, a data collector and a temperature control unit. By using the method for measuring the thermal characteristic of the LED, through combination adoption of dynamic scaling and static measuring, improves the accuracy of the temperature rise curve and shortens the measuring time at the same time.

Description

technical field [0001] The invention relates to the technical field of light-emitting diode measurement, in particular to a method and device for measuring the thermal characteristics of light-emitting diodes. Background technique [0002] Due to the advantages of small size, high luminous efficiency, and long life, light-emitting diodes (LEDs) are gradually replacing traditional light sources such as incandescent lamps and fluorescent lamps, becoming a new generation of green lighting sources. The light-emitting mechanism of light-emitting diodes is that electrons transition from high-energy bands to low-energy bands to emit photons, instead of emitting light through thermal radiation like incandescent lamps, and their luminous efficiency is greatly improved. At present, the luminous efficiency of light-emitting diodes has reached 100lm / W, but the external quantum efficiency is less than 50%, which means that the luminous efficiency of light-emitting diodes still has a lot ...

Claims

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Application Information

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IPC IPC(8): G01R31/26
Inventor 钱可元高亚楠
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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