Development of 30 Watt high-power LEDs vapor chamber-based plate

Wang, Jung‐Chang; Wang, Rong Tsu; Chang, Tien Li; Hwang, Daw Shang

doi:10.1016/j.ijheatmasstransfer.2010.05.018

Cited by 98 publications

(55 citation statements)

References 13 publications

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“…The power LED beam of 0.75 W(7.5nJ/10 ns) was installed into the lidar setup [22][23][24]. Its divergence is 10 mrad and the receiver's field of view is 5 mrad.…”

Section: Lidar Applicationsmentioning

confidence: 99%

High-Speed and High-Resolution Photon Counting for Near-Range Lidar

Shiina¹

2018

Photon Counting - Fundamentals and Applications

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The near-range lidars for hard target and atmosphere detection should follow to the quick motion/activity of the measurement target. The transmitting optical power will be lowered for safety in the human activity space. And the lidar should increase the pulse repetition frequency to get the enough signal-to-noise ratio. The high-speed, high-resolution and high-repetition photon counting is desired for the near-range lidar. It is not a single photon counting at a certain delay time, but a multi-channel scaler with a deep memory for a series of delay times, that is, ranging data acquisition for lidar application. In this chapter, the mini-lidar for near-range observation is discussed. The targets are dust, gas, and atmosphere (aerosols). The activity monitoring of the atmosphere within a few hundred meters is the purpose of this mini-lidar. To follow and visualize the rapid motion of the target, high-speed and high-resolution photon counters (multi-channel scalers) were developed. The observation range can be easily adjustable depending on the lidar setup. The system can visualize the rapid motion of target with the high-resolution of 0.15 m (BIN width of 1 ns) and the minimum summation time of 0.2 s.

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“…The power LED beam of 0.75 W(7.5nJ/10 ns) was installed into the lidar setup [22][23][24]. Its divergence is 10 mrad and the receiver's field of view is 5 mrad.…”

Section: Lidar Applicationsmentioning

confidence: 99%

High-Speed and High-Resolution Photon Counting for Near-Range Lidar

Shiina¹

2018

Photon Counting - Fundamentals and Applications

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“…It has already been confirmed that the vapor chamber has antigravity, high effective thermal conductivity, and is suitable for high heat flux of a heat source as the integrated heat spreader. 6,7 Some research on thermal characterization of LED packages with the vapor chamber [7][8][9][10] has been reported. With the power input equal or greater than 80 W of the LED illuminator and its potential for energy-saving and general illumination applications such as road and tunnel lighting, there is an urgent need for the research on thermal characterization of these new high-power packing technologies with low thermal resistance and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of a 100-W high-power light-emitting diode array using vapor chamber–based plate

Zhang

Zeng

Chen

et al. 2015

Advances in Mechanical Engineering

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In this study, a compact 100-W input power light-emitting diode array vapor chamber-based plate has been fabricated to investigate the thermal performance. To make a comparison, a typical commercial chip on board-type light-emitting diode array using a copper-based plate which has the same chip layout and the same power input was also investigated. The surface temperature distribution and total thermal resistance corresponding to these two high-power light-emitting diode modules were measured using a thermal infrared camera and a MicReD T3Ster. The experimental results show that the thermal performance of the compact light-emitting diode array using vapor chamber-based plate is much better than that using copper-based plate. The average temperatures of light-emitting diode copper-and vapor chamber-based plates are 100.5°C and 41.5°C at 100 W power input, respectively. In addition, the maximal temperature difference of the 100-W light-emitting diode array vapor chamber-based plate is 2.2°C far less than 31.7°C of copper-based plate. Furthermore, the measurement results show that the vapor chamber can prominently lower the spreading resistance, diminish the hot-spot effect, and increase durability.

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“…LEDs will be a great benefit to the saving-energy and environmental protection in the lighting lamps region. Wang et al (2010a) introduce a thermal-performance experiment with the illumination-analysis method to discuss the green illumination techniques requesting on LEDs as solid-state luminescence source application in relative light lamps. The temperatures of LED dies are lower the lifetime of lighting lamps to be longer until many decades.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal performance of the LED vapour chamber-based plate (LED-VCPCB) is many times than that of LED copperand aluminium-based plates Wang 2011d). Wang et al (2010a) utilizes experimental analysis with window program VCTM V1.0 to investigate the thermal performance of the vapour chamber and apply to 30 Watt high-power LEDs. Results show that the maximum effective thermal conductivity is 965 W/m°C at 187.5 W/cm 2 .…”

Section: Introductionmentioning

confidence: 99%