Last year, the Ten Cities and Ten Thousand Demonstration Project did not bring as much results as expected. Instead, the shortcomings of this high-power LED lighting were fully exposed: the LED driver power supply was extremely poor, the heat was high, and many LEDs The drive power is burned out, many of which are caused by the failure of the inconspicuous peripheral small device to cause the entire drive circuit to fail. Now, TI proposes an innovative architecture that can greatly improve this situation.
Because of the low efficiency of the LED driver circuit, the ambient temperature is high, and many devices cannot withstand such high temperatures. I also saw the burned out devices for our customers. Some of them were only small transistors and diodes burned out, and the whole power supply collapsed. Liu Xuechao, business development manager of Texas Instruments' high-performance analog products, explained to Sun Changxu of Electronic Engineering Album that it seems to be a small problem, but the overall temperature of the LED is very high, 70 heat is dissipated through the heat sink, and the heat sink is behind the drive power. The temperature is very high and it is difficult to control. Therefore, the industry's current goal is 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 revolutionary and innovative LED driver architecture bipolar multi-string LLC topology architecture, which is omitted from the traditional high-power (250W300W) LED driver architecture. The expensive multi-string high-voltage DC/DC buck is changed to the 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. Increased reliability and EMI design are simpler. Simply put, it is to combine the original constant voltage module and constant current module into one module, which is equivalent to saving a constant voltage module. Liu Xuechao said.
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