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High-power LED heat resistance measuring device and method of measuring high-power LED heat resistance thereby

A measurement device and high-power technology, which is applied in the direction of single semiconductor device testing, etc., can solve the problems of low measurement accuracy of high-power LED thermal resistance measurement devices, and achieve the effects of shortening thermal equilibrium time, simple operation, and fast measurement speed

Inactive Publication Date: 2014-03-12
黑龙江省计量科学研究院
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low measurement accuracy of existing high-power LED thermal resistance measuring devices, provide a high-power LED thermal resistance measuring device and a method for measuring high-power LED thermal resistance using the device

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  • High-power LED heat resistance measuring device and method of measuring high-power LED heat resistance thereby
  • High-power LED heat resistance measuring device and method of measuring high-power LED heat resistance thereby
  • High-power LED heat resistance measuring device and method of measuring high-power LED heat resistance thereby

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 Describe this embodiment, the high-power LED thermal resistance measurement device described in this embodiment includes a measurement base 1, a temperature control device 2, a junction voltage measurement device 3, a standard power source 4 and a single-chip circuit 5, and the measurement base 1 is a belt A base with two jacks, the temperature control device 2 is used to control the temperature of the measurement base 1, the power control signal output end of the single-chip circuit 5 is connected to the power control signal input end of the standard power source 4, and the standard power source 4 The two electrical signal output terminals of the measurement base 1 are respectively connected to the two jacks of the measurement base 1, and the two jacks of the measurement base 1 are respectively connected to the two junction voltage measurement signal input terminals of the junction voltage measurement device 3. The jun...

specific Embodiment approach 2

[0029] Specific implementation mode two: combination Figure 3 to Figure 5 Describe this embodiment, this embodiment is a further limitation of the high-power LED thermal resistance measuring device described in Embodiment 1: In this embodiment, the standard power source 4 includes an adjustable DC reference signal source and a DC power amplifier The DC reference signal output terminal of the adjustable DC reference signal source is connected to the DC reference signal input terminal of a DC power amplifier, and the DC power amplifier includes an open-loop DC power amplifier and a closed-loop feedback control circuit.

[0030] Most of the driving methods of power LEDs are constant current driving, that is, they work in the mode of constant current (marked as rated current and power). The description mainly includes adjustable DC reference signal source and DC power amplifier.

[0031] The function of the adjustable DC reference signal source is completed by two 12-bit DACs in...

specific Embodiment approach 3

[0056] Specific implementation mode three: combination figure 2 Describe this embodiment, this embodiment is a further limitation of the high-power LED thermal resistance measuring device described in Embodiment 2: in this embodiment, the accuracy of the standard power source 4 is ±0.02%, and the standard power Source 4 has two power amplifier outputs, one is the test current, the range is 0-50mA, the accuracy is ±0.02%; the other is the heating current, the range is 0-2A, the accuracy is ±0.02%.

[0057] The standard power source 4 in this embodiment has two power amplifier outputs, one is the working current If of 0-2A output, and the other is the test current (generally set as 10mA) Io of 0-50mA output. In order to achieve fast switching to improve the speed and accuracy of LED junction voltage drop measurement, the two power amplifiers can work at full load at the same time, and the two currents are switched through the output relay. Measure the LED junction voltage drop...

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Abstract

The invention relates to LED heat resistance measuring technologies, in particular to a high-power LED heat resistance measuring device and a method of measuring high-power LED heat resistance thereby, and aims to solve the problem that the existing high-power LED heat resistance measuring device is low in measuring precision. LED junction temperature is controlled by controlling surface temperature of a measuring base; according to the semiconductor physical feature that LED junction temperature and heat resistance are of certain linearity, the LED junction temperature and the heat resistance are measured by measuring LED junction voltage drop. A standard power source provides an LED with standard current; a temperature control device uses PID regulating technology, and the temperature of the measuring base is balanced fast; through the adoption of contact measurement, the base and LED thermal balance period is shortened greatly; when the temperature is balanced, spot measurement of LED junction voltage drop is performed fast with low current; through the measurement of junction voltage drops of multiple temperature spots, LED voltage temperature coefficient is calculated. The high-power LED heat resistance measuring device and the method have the advantages that measuring speed is high, operation is simple, measurement precision is higher than + / -1%, and the device and the method are applicable to high-power LED heat resistance measurements.

Description

technical field [0001] The invention relates to LED thermal resistance measurement technology. Background technique [0002] With the advancement and development of science and technology, the power of LED semiconductors increases, and LED semiconductor lighting is developing from traditional indicator functions to lighting functions. Due to its many advantages such as greenness and environmental protection, LED semiconductor lighting is considered to be a revolutionary solid light source that replaces traditional lighting sources such as incandescent lamps and fluorescent lamps that consume a lot of power and pollute the environment. LED lighting is a process of converting electrical energy into light energy. In this process, only about 20% of the electrical energy is converted into light energy, and the rest is dissipated in the form of heat energy. Therefore, LED is used as a lighting source, and thermal management is very important. , is an indispensable and even the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26
Inventor 杨新华李季徐民张博李浩陈玉兰曹曙光孙伟波刘缨李红星高春旭孟景华
Owner 黑龙江省计量科学研究院
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