Zhou Xiaoli, Institute of Electric Light Sources, Fudan University: Discussion on Drive Control Technology of Spectral Adjustable LED Lamps

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On June 10th, the lighting industry annual event 2016 Aladdin Lighting Forum was held during the Guangzhou International Lighting Exhibition, the world's largest lighting exhibition. In the sub-forum on the integration of power modules and optoelectronics, Zhou Xiaoli, an associate professor at the Institute of Electric Light Sources at Fudan University, gave a wonderful speech on the topic of drive control technology for spectrally tunable LED lamps. First of all, Zhou Xiaoli listed the characteristics of LEDs different from traditional light sources, mainly small size, narrow spectrum, and fast switching characteristics. Three reflections of LED five lighting, including shape and size can be flexibly formulated, time and space control. Spectral tunable LED luminaires can work in different fields. In this economic vision field, it can be used for multi-spectral acquisition, and it can be assembled by multiple LEDs, which will be of great use in some fields. She also mentioned that the family is also the future direction. The current LED wavelength of the LED is flipped over the infrared, making control easier. She cited a number of specific market cases to illustrate, for example, the combination of several LEDs to form the output of the solar spectrum, the problem of LED light decay, and the addition of feedback adjustment. They made a simulation of the solar spectrum, and more than 30 kinds of LEDs were selected for testing from the market. Some of them were missing. Finally, phosphors were selected to fill them, and finally 12 kinds of LED wavelengths were used. She said that the current dimming control is mainly analog dimming and PWM dimming. In terms of thermal control, different LEDs will have a change in light effect under the influence of different temperatures. The temperature will also cause changes in the spectrum, as well as the problem of service life. Similarly, different colors and different wavelengths are also different, so the lamps It is also necessary to carry out corresponding heat-dissipation control. The heat-dissipation method currently has natural air-cooling, and some water-cooling methods. In order to make the temperature stable when making spectrally adjustable lamps, different junction temperatures can be externally corresponding. He showed a structural diagram of the control, which illustrates the factors to be considered when performing the light mixing control, indicating that certain compensation corrections are required when appropriate. Finally, she talked in detail about a spectrally adjustable experiment. The characteristics of the retention and reading of the custody data that can be grouped by human-machine cross-section are highlighted.

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