The night drive was subjected to distant light. It is believed that many people, like me, are outraged by the practice of driving at night and not changing near lights. Night long-lights and direct exposure to vehicles can reduce speed and distance judgement by becoming short-blind to drivers, increasing the likelihood of accidents, as in the line in "travenger earth": "twenty million roads, one safety, a standard drive, tears in love". In order to prevent large lights from causing trouble to vehicles or pedestrians in the front, many companies are now upgrading medium- and high-end vehicles to matrix led lamps。
Automobile technology has evolved in recent years as cars have become more popular. In the case of car lamps, the first halogen lamps were also developed into gas lamps, followed by the current led and matrix led lamps。
Matrix led workbook
A matrix led light is a large lamp managed by a matrix partition for led light sources. The led light source of the matrix is brightened by a car computer, and it is open/off. The matrix led pre-lights are characterized by the ability to switch on the remote light, adjust the range of light exposures and reduce the brightness within a given range。
Compared to regular led lamps, the matrix led lamps are fine enough for light-source control to specified beads, and ordinary led lamps control only the entire led beads, which are far less functional and extended than matrix leds。
The matrix led light allows for flexible and variable manipulation to be lighted in any car environment without affecting others. When driving at night, there is a pedestrian or car in front, and beads in the front pedestrian or car matrix area will cause the lighting to fall down or be extinguished so that the driver or pedestrian on the front car is not exposed to the risk of strong light。
"lightwork" audi matrix leds
When it comes to lights, the first thing you're thinking about is audi, who's on the internet saying, "other companies put lights on cars, audi put cars on lights, and audi is called a "light factory" by his friends, thus demonstrating that audi's light technology has its own uniqueness。
As far as the lights are concerned, audi is driving a lot of history. In the 1990s, audi was the first to apply thorium lamps to car lighting, triggering a wave of changes in car lights. In 2008, audi installed led daylights on a8, which is also the first vehicle in the world designed with led daylights. It was only in 2013 that odie was re-equipped with matrix led lights when it was felt that the study of car lights by audi was entering the bottleneck period。
The audi a8 matrix led pre-lights have five sets of led luminescence modules, each of which has five led beads, each of which is relatively independent and can be lighted or turned off separately. With a total of 25 light sources on individual lamps, 960 million combinations of lighting can theoretically be achieved and can easily cope with a variety of driving scenes and enhance night lighting capabilities. When the front vehicle does not have vehicles or pedestrians, the lamp is fully open and the head camera or light sensor is exposed to pedestrians and vehicles, which automatically extinguishes the beam that sends the light, minimizes the impact on the other person's view, and returns the light fully when the vehicle exceeds the pedestrian or vehicle. The audi matrix led lights also interact with the trafficer's alarm function, the car light and the night vision aids system, automatically light up the pedestrian's light when someone passes in front of them, and flash three warnings to pedestrians to pass by, increasing the night's safety。
Behind such a high-performance car lamp, the matrix led drive chip contributed to the effort, followed by a detailed description of the performance of the multiple matrix led chip on the lamp。
Nxp double-channel pressure-relief matrix led drive chip
Nxp's led drive chips are multifunctional, constant, high-profile and have introduced low-cost, high-extension solutions. In the multi-channel drive ic, each corridor needs to be replaced by one mosfet to improve thermal dispersion and achieve higher power density. The current maximum nxp led drive chip can be extended to 12 channels with power of 30w ~140w, using smaller hvqfn32 packagings to facilitate the development of engineer layouts and reduce the overall pcb area。
Asl2416shn is a two-channel pressure-relief led drive chip for matrix led lamps that can enter constant direct current power sources for leds. The chip is internalized into a spi interface, which is used to communicate with external controllers for confluence temperature monitoring, which allows for the programming of two channels through the spi interface, independently drives two channels, controls the output current output range (with a precision of 5 per cent), reads the current values, and allows for a single lighting of each channel, which drives up to 20 independent led sources between 2. 5 v and 70 v, and produces currents above 1. 5 a. The working temperature of asl 2416shn is -40°c ~125°c, which is not affected by normal high temperatures, rain and snow, and the input voltage is between 10v and 80v. The chip is used for export protection in short- and open-circuit conditions to avoid the burning of led lamps。
Ti highlight matrix led drive chip
With the rapid development of automobile lighting technology, tti has been working to develop innovative processes, seals and circuit design technologies, and by its own advantage has developed several matrix led-driven chips for vehicle lighting at super-high power density, for afs, adb and high-resolution front-light systems that meet stringent emc design requirements. In the area of corridor control, it is now extended up to a maximum of 48 to achieve more sophisticated control systems。
Tps 92663a-q1 is a 6-channel high-light matrix led drive chip. The chip is built into six side switches, each of which contains two substrings, with a single substring that can also be connected to one or more current sources at the same time, and by-pass switches that conduct small resistance and reduce losses significantly. When the chip drives a specified bead, the chip can be controlled by the other beam alone。
Tps92663a-q1 supports multi-point uart communications interfaces, which support up to 16 addressable devices simultaneously. Cmu is connected to the chip via the uart communications interface and has completed control operations. Tps 92663a-q1 and tps 92662a-q1 are compatible and can be integrated into the same bus. Tps 92663a-q1 has two adcs entered by mux, two mode converters that can compensate the system for temperature and measure grade values to complete led classification and code. Each pulse width of the chip is programmable and supports 10-bit pwm lumber function, while programmable voltage is effective in reducing electromagnetic interference. Tps 92663a-q1 meets the requirements of aec-q100, with a working temperature range of -40°c ~125°c, and supports the light input of 4. 5v ~60v。
On two-channel matrix led drive chip
The led front-light drive chip in ansemey has now evolved to the third generation, and its chips are widely used by automobile companies such as audi, mercedes and bmw. Ncv78763 is a two-channel, efficient, intelligent led drive chip that can be used in matrix leds, daylights, switchlights and other vehicle lighting devices. The chip can drive two serial lamps with a maximum power of 60 v through two separate internal channels. The chip contains a spi interface for the dynamic control of system parameters, which allows for the programming of two output channels, each with a demand-controlled output current and voltage, with an output current maximum of 1. 9a and a constant current of 1. 6a. Ncv78763 has also been integrated into the pwm luminary function, which effectively reduces the frequency of light flashing and avoids visual fatigue by drivers when travelling at night。
