High power LED light source blu-ray drive circuit design

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Published: 29th June 2012
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Abstract: in order to gathering underwater target image information, reduce the cost of underwater imaging system, by the use of the high density led strip instead of traditional blue laser do light source, combined with CCD imaging technology, adjust the beams of light to illuminate divergence Angle underwater target scene, will target all or target key characteristics of light parts, and to realize the underwater target, imaging. Based on the design of high power, LED iris4011 constitute the blue light constant pressure constant current driver circuit. The driver circuit is stable and reliable control power rating in LED, through the underwater imaging experiments, acquisition to underwater target information, the experimental results show that the field of narrow range tracking and receive target information, largely reduced to the scattering on imaging after the influence on the quality of, and improve the system of the signal-to-noise ratio and effective distance.
Known as the "green light" semiconductor 12v led light bars technology develops quickly, LED with low power consumption, long life, small size, green environmental protection, etc. Through to the high strength blue LED of r&d produced several generations more and more high brightness of the device, in 1990 or so the launch of the silicon carbide materials based on LuoPian LED efficiency is about 0.04 lm/w, intensity of light a few more than 15 MCD. The 1990 s in the first based on the practical gan LED. Now there are many companies in the basement with different (such as sapphire and silicon carbide) Production gan LED, these LED to a green, blue or violet wait for the color of light. High brightness LED to the invention of the blue screen as the realization of the horizontal advertising may. The screen can show the full motion video, horizontal image. As technology advances, now can produce power as high as 100 W. Flux to 2 000 lm high-power high brightness LED the blue light. So it was a kind of has a wide
The application of technology, it is necessary to do the thorough research. Underwater imaging system is built-in to the blue sea green light (480 ~ 540nm) low loss window on the basis of a kind of built underwater imaging system. It cannot only use in normal water, and can be used in turbidity water, even in the dark see also observe. This paper is mainly based on high-power blue LED underwater imaging system research. High power LED Blu-ray (& gb; 50 W) light source driving circuit is based on the power of the blue LED underwater imaging system research and the analysis of the important component.
1 basic principle and circuit design
For underwater imaging system is concerned, the choice of the light source is vital, and stability of light source, uniformity and response speed and light wavelength range is the key to the imaging system. The flexible led strip from the room after water medium-targets reflect-water medium-receive optical system, finally in imaging sensors (CCD, iced) imaging. This determines the LED must work in fast driving mode pulse, currently on the market driving circuit is normally in slow pulse butyl driven model (& mu; s Middleweight), far cannot meet our requirements. Therefore, we have to solve quick pulse drive circuit this problem, especially to realize the scale of high power fast ns pulse to drive the high power LED. Based on the actual needs of the experiment, we studied and developed such quick pulse drive circuit. This circuit is the basic function of producing low-frequency, rapid and high power drive current pulse signal, the output pulse frequency and cycle high precision, good stability, pulse signal in 20 to 100 ns wide within five points file can be adjusted and output of frequency 50 Hz benchmark of frequency. The pulse signal through the driver circuit, output a quick pulse signal driven output current switch, produces a large current pulse signal driven by a high power LED. In order to meet the design requirements and purpose, we use crystals produce high precision circuit frequency/cycle benchmark pulse signal source as a built-in, through several points to benchmark pulse frequency, produce the output pulse frequency required signal, and can obtain frequency stability of the pulse signal, and realize the frequency selection. After points after the frequency pulse signal again by pulse width forming circuit implementation pulse width adjustment, and then after current switch circuit, produce large current pulse, so that LED. This driving circuit is mainly by the following parts: the signal frequency circuit, frequency, points choice, the pulse width circuit, TTL output drive circuit and the current switch circuit. The block diagram showed as showed in figure 1.

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