In recent years, the electronic components of automobiles have been continuously improved, helping to improve fuel economy, reduce emissions, and enhance safety, lighting, in-vehicle networks and infotainment systems. Among them, car headlights are an important part of safe driving. ON Semiconductor's innovative and leading industry automotive adaptive headlamp system (AdapTIve Front-lighTIng System, AFS) motor drive solution overcomes the limitations of traditional headlamps and helps Improve driving safety. This article analyzes the characteristics of AFS, introduces the AFS solution of ON Semiconductor, and the application design points to help customers apply the automotive AFS solution.
Application Advantages and Working Principles of Adaptive Headlamp System (AFS)
The light of the traditional car headlights is always the same as the direction of the car body. When the car turns, it cannot effectively illuminate the blind spot inside the curve. If there is a person or object inside the curve, and the speed is not properly lowered, it will bring safety hazards. As shown in Figure 1. In comparison, the AFS function provides a swiveling adjustment that rotates at the angle of the steering wheel to project an effective beam onto the front surface that the driver needs to see to help reduce safety hazards.
Figure 1: AFS function rotation adjustment (left) and horizontal adjustment (right) lighting effects
In addition to dynamic rotary adjustment, the AFS function provides dynamic level adjustment. This function adjusts the headlight level according to the signal of the load axis sensor, which can adapt to different loads and different slope environments. As shown in the right side of Figure 1, the above figure shows the effect of the AFS function on the light level under normal conditions. The middle picture shows the effect of the light up under the bumpy condition of the car when starting or going uphill. The figure below is under braking or downhill conditions. The lighting level sinks the lighting effect. It can be seen that AFS can dynamically adjust the light height according to the horizontal tilt of the vehicle body to improve the lighting effect and enhance safety. The structure diagram of AFS working principle is shown in Figure 2 and Figure 3, respectively.
Figure 2: Structure of the working principle of AFS 
Figure 3: Structure diagram of the working principle of AFS (continued)
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