LED four-thermal-resistor detection apparatus, and calculating method thereof

Abstract

Current LED thermal-resistor measurement only measures the conduction thermal resistance from an LED to a radiating fin and the convection thermal resistance from the radiating fin to the air, and does not measure the conduction thermal resistance from a PN junction of the LED to the upper surface of the LED and the convection thermal resistance from the upper surface of the LED to the air. The invention relates to a thermal resistance calculating method based on an LED four-thermal-resistor detection apparatus. The thermal resistance calculating method based on an LED four-thermal-resistor detection apparatus is an exhaustion searching optimization algorithm, and the LED four-thermal-resistor detection apparatus includes 2 constant current sources, 1 controllable switch element, 3 temperature sensors, 1 current sensor, 1 voltage sensor, 1 thermotank and a measurement and control unit. The LED four-thermal-resistor detection apparatus, and the calculating method thereof can obtain thejunction temperature of an LED bead and four resistance values of the LED, and can provide more reliable thermal resistance data for LED application, design of an LED radiator and evaluation of LED service life.

Description

technical field [0001] The invention relates to the field of LED thermal resistance research, in particular to an LED four-thermal resistance detection device and a calculation method thereof. Background technique [0002] With the continuous development of science and technology, the application of high-power LED lamps is becoming more and more extensive, and the requirements for LED heat dissipation detection are also getting higher and higher. [0003] The LED junction temperature directly determines the life and reliability of the LED. The heat dissipation performance of the LED working environment is generally evaluated by thermal resistance. The larger the thermal resistance, the higher the LED junction temperature. [0004] The research on LED thermal resistance in the prior art only considers the conductive thermal resistance from the LED chip to the radiator and the convective thermal resistance from the radiator to the air, referred to as the two thermal resistance...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, most of the measurement of LED thermal resistance is manual measurement, the degree of automation is not high, and the error is relatively large. image 3 shown

[0006] It can be seen that there are defects and inconveniences in the existing LED two heat resistance methods and devices, which need to be further improved urgently.

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