When it comes to the application prospects of LED in the special field of automobiles, some manufacturers said that the demand for complete vehicles is an important driving force for the development of automotive electronics. At this stage, it is still necessary to strengthen cooperation among various suppliers in the overall industrial chain, including automobile manufacturers. , automotive lighting manufacturers, LED product suppliers, etc., we jointly explore and develop LED products suitable for the future needs of automotive lighting.
Specifically, on the one hand, LED manufacturers can promote the LED product technology through the design and development department of the OEM, deepen the understanding of LED products and future development trends, and thus in the design and development of next-generation platforms. Make full use of LED to achieve innovation in the field of automotive lighting. On the other hand, LED manufacturers should further understand the needs of the car manufacturers for LED lighting products, and work with OEMs and lighting module manufacturers to define product specifications and improve the R&D roadmap for newer products. At the same time, more cost-effective system solutions, simpler and more reliable reference designs, and a more responsive application team will contribute to the widespread use of LED products in the automotive industry.
For the LED driver circuit part, Lu Hao believes that the introduction of high-power LED will gradually make DC-DC LED driver a must, LED driver chip will gradually realize multi-channel integration and control intelligence. This is because with the wide application of LEDs, the integrated LED headlights will require a more compact and efficient multi-drive LED driver module, driving on one board including far and near light (multiple LED), fog lights, turn signals And multi-channel LED light source such as daytime running lights, the whole module communicates with the body control unit through CAN or LIN protocol, and can carry out more complicated control and diagnosis. In terms of intelligence, the multi-channel LEDs of the LED headlights can be controlled by an optimized algorithm to realize various light intensity, light shape and light angle control required for the smart headlights.
It is understood that in order to adapt to the demand trend of LED headlights, NXP is working with international first-line automakers and first-line suppliers to define the next-generation multi-channel automotive LED driver solution. The application circuit of this solution has two levels. The stage is a multi-phase boost circuit that boosts the battery voltage to the subsequent stage to provide a stable supply. The latter stage is a multi-channel buck circuit, each of which is independent. The control chips of the pre-stage and the post-stage are separated, and each of the boost pre-stage and the buck stage has a series of products that can drive different phase numbers and output channels. Through the different combinations of pre-chip and post-chip, LED driver integration design from 2 to 8 or even more can be easily realized modularly. The full range of boost and buck chips can communicate with the MCU on the driver board via the SPI interface. The system efficiency is greater than 90% and the maximum single drive current can reach 1.5A or more.
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