LED is widely used in automobiles, such as it can be located in the interior of the car or in the lower part of the door, focusing the light on the specific area inside and outside the car. LED can also be integrated into door handles, key holes, pedals, cups, or as a flashing light on the rearview mirror. The shape of the luminous indicator can be very simple or very beautiful, so as to meet the precise lighting, and provide convenience and beauty for people.
Luxury lighting program across the middle and low car market
From the application level, the automotive lighting is divided into internal and external lighting. Today's automotive interior lighting most of the bright white LED driver and RGB RGB programmable drive. The exterior lighting is no longer limited to headlamps and taillights, body lighting (such as identification lights and door handles) and external RGB has been used in luxury cars, is expected to penetrate into medium and low-grade cars.
1, today's automotive interior lighting - white light
White light LED is mainly used for ceiling lamp, reading lamp, cargo hold lamp and so on. It is different from the standard bulb, which can provide warm and comfortable atmosphere for the driver. Automobile manufacturers use white LED can provide the atmosphere light of different options, from simple discrete white LED driver control on / off to the dimming slope more complex, to produce unique modeling and effects and differences, such as getting off or getting from dramatic effect.
2, today's automotive interior lighting - RGB
RGB and white LED complement each other, its development is driven by power to further make vehicles personalized, light source can be used as internal programming, including the dashboard, console, navigation / audio area lighting and atmosphere lamp application effects.
3, today's taillights
From the past to the present single LED opaque and uniform light, from the animation signal to the flash light sweep, as an important part of the drive car taillight evolution, in addition to continuous innovation in style, image and other car appearance, but also improve the safety factor, and can support the start and stop the pressure drop, and adaptive environment light conditions, is crucial to meet the energy requirements of automobile manufacturers and government. For this application, A Morimi semiconductors provide linear regulators and controllers.
4, today's car headlamps
LED headlamps are widely used in day running lights (DRL), and the most common two schemes are light guide LED and LED series. These DRL applications not only provide better visibility for oncoming vehicles, but also rely on the flexibility of LED and LED drivers to personalize their vehicles and create a unique "visual" brand.
For the advanced luxury car headlight is not limited to DRL, high beam and low beam, car manufacturers can also choose LED lights, LED fog lights and high-speed road lights design, and with the combination of HID and LED for the headlight system, and in the future all LED lights. In the promotion of more personality, more safety and higher efficiency of the trend, considering that platform modular, low cost "from entry-level to high-end development of the" fully functional "advanced lighting system", to provide a variety of innovative automotive manufacturers.
Here are several automotive lighting solutions introduced by semiconductor manufacturers.
1, NXP + Microchip multi-channel automotive headlamps solutions
[scheme introduction]
With the increasing efficiency of LED led, longer life, and the progress of LED technology, the LED light source has entered the field of automotive lighting. In addition to brake lights, daytime driving lights, car headlights are also increasing use of LED products. With the rapid development of products, more requirements for product structure, size, cost performance, intelligence and so on are put forward. In response to the needs of the market, the NXP + Microchip multi channel automotive light off scheme is introduced.
[program features]
Multi channel automotive light off scheme is a solution tailored for automotive lighting module, which contains 3 outputs. The ASL4500 raises the battery voltage to one or two stable voltage values as power bus loads. The ASL3415 is a constant current control chip with 3 independent outputs, each of which can output the maximum 1.5A current to drive the LED. All parameters are set by Microchip high performance automotive MCU PIC18F25K8-E/SS using SPI communication mode control, and is responsible for the use of PWM dimming and automotive communication function.
[system block diagram]
[specifications]
ASL4500, ASL3415
Microchip main device: PIC18F26K80-E/SS
2, Infineon TLD5097EL/TLD5098EL automotive LED headlamps drive solutions
[scheme introduction]
As early as 10 years ago, LED embarked on a journey into the automotive field, at present, the application of LED in the car lights and brake lights, emergency lights, daytime running lamp etc. has got remarkable results, the proportion of LED in the vehicle internal and external lighting has exceeded 80%. With the gradual decline of the rapid development of LED lighting technology and cost, LED headlight technology after verification, in recent years the concept car show stage, more and more close to the prospect of a wide range of applications in the production car in the system. From the Audi R8 electronic system full use of LED lights, to BMW, Cadillac, Mercedes, TOYOTA and other companies have also introduced the LED headlight to replace the traditional incandescent light bulbs, HID car models, I believe there will be more car manufacturers will LED lights as the automobile lighting preferred soon. Compared with traditional incandescent lamps, LED lights need constant DC power supply, and need a series of protection functions and state feedback. Therefore, we introduce Infineon automotive LED headlamps drive the overall solution.
[program features]
This program is based on the special vehicle LED lights Infineon control chip TLD5098EL and TLD5097EL as the core driver, MCU is used in high performance Infineon automotive grade 16bit microcontroller SAK-XC2331D, LIN and CAN, and can realize the USB communication function, can through the PC professional software is the light switch control, status indication and parameter indicator lights Head; Lamp Board has a daytime driving lights, turn lights, headlight and high beam light output, with input over-voltage protection, daytime running lights and output open circuit short circuit, open circuit and short circuit to turn light output, the output open circuit and short circuit, open circuit, short circuit and light output over-current protection function.
[system block diagram]
[specifications]
The following is the product used in the program:
TLD5097EL: Automotive LED DC-DC driver IC
TLD5098EL: Automotive LED DC-DC driver IC
IPD25N06S4L-30:MOSFET
SAK-XC2331D: 16 MCU in automotive level
TLE9262:SBC chip
3, A Morimi latest matrix dynamic intelligent all LED headlamp program
In recent years, the matrix dynamic intelligent LED headlamp has appeared in the market, such as the intelligent LED headlamp equipped with the new generation S class car of Mercedes benz. Previously, the light system contains 56 LED, each LED can be lit, extinguished or adjusted brightness. The unique function of this lamp is as follows:
Proof of the vehicle dazzling: LED according to the former radar and stereo camera data to turn on or off or adjust the brightness action, adjust the irradiation range automatically, to ensure their own sight at the same time, the other side of the vehicle to avoid glare.
Steer clear of the front vehicle profile: when you run the vehicle in the same direction in front, you can steer clear of the front car contour and completely illuminate the left and right side of the front car. Therefore, the high beam can be turned on during driving at night, which greatly improves the traffic safety.
Pedestrians flashing fast: smart headlights can identify pedestrians in front of the headlights automatically flashing quickly, to remind pedestrians to avoid danger, reduce the possibility of night accidents.
Figure 1: the unique function of the dynamic intelligent all LED headlamp
The matrix type dynamic intelligent all LED headlamp can use series or parallel drive structure. When the parallel structure is adopted, the electrical characteristics of each LED have significant influence on the performance of the lighting system, resulting in the increase of energy consumption and heat dissipation. In the serial drive structure, the LED driver provides a constant current source, and the short circuit switch can turn off a single LED so that the light beam can be changed as required. If the companion chip (pixel controller) is added to the series drive circuit, and the system is divided, it is possible to avoid the inherent energy consumption and thermal management problems of the parallel topology.
Fig. 2A schematic diagram of A Morimi semiconductor matrix vehicle LED headlamp scheme.
Fig. 2B schematic diagram of A Morimi semiconductor matrix vehicle LED headlamp scheme (continued).
The NCV78763 buck boost LED driver IC of A Morimi semiconductor acts as a current source in the matrix dynamic smart all LED headlamp, which is integrated with an integrated pixel controller / companion chip. This modular approach reduces the number of components and simplifies the application process, thus speeding up the listing of products.