Last year, the “Ten Cities and Ten Thousand Cities†demonstration project did not bring fruitful results as expected. Instead, the shortcomings of this high-power LED lighting were fully exposed: LED driver power supply is extremely poor, and heat is high. The driving power of the LED is burnt out, many of which are caused by the failure of the inconspicuous peripheral small device to cause the entire driving circuit to fail. "Because of the low efficiency of the LED driver circuit, the ambient temperature is high, many devices can't stand the high temperature and burned off. I also helped our customers to see the burnt devices, some are only small transistors, diodes burned, the whole The power supply has collapsed." Liu Xuechao, business development manager of Texas Instruments' high-performance analog products, explained, "It seems to be a small problem, but the overall temperature of the LED is very high, 70% of the heat is dissipated through the heat sink, and behind the heat sink is Drive power, high temperature, difficult to control." Therefore, the industry's current efforts are to improve efficiency, reduce the degree of diffusion, increase integration, reduce the number of components, and try to use reliable components. "For example, inductance is a very reliable thing, and inductance is something that everyone has used for thousands of years, not active devices," he added.
In response to this goal, TI officially launched a new LED driver architecture this year - bipolar multi-string LLC topology architecture, which saves expensive compared to the traditional high-power (250W-300W) LED driver architecture. The multi-string high-voltage DC/DC buck converter is changed to LLC resonant circuit with multiple transformers in series to directly achieve constant current, and the efficiency is greatly improved to 92%, which is 4-5% higher than the traditional architecture, and the number of components is also greatly reduced. Reliability is improved and EMI design is simpler. (pictured) "In short, it is to synthesize the constant voltage module and constant current module that are originally needed into one module, which is equivalent to saving a constant voltage module." Liu Xuechao said.
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