Grounding distribution The grounding of platform-based electrical appliances can be roughly divided into signal ground and power ground. The two types of grounding should be designed as far away as possible, and the same type of grounding can be considered. The digital circuit has strong anti-interference ability and can share the ground with some power circuits. The analog signal itself is very weak and easy to be interfered, so it is not suitable to share the ground with the digital signal loop and the power loop. At the same time, the grounding design should fully consider the vehicle model and configuration planning, and the planned reserved configuration and electrical grounding should be incorporated into the grounding platform design in advance. In the type of common grounding, there are two types: series grounding and parallel grounding. Series grounding is easy to arrange and has low cost, but it has the disadvantage of common impedance coupling. It is suitable for common grounding of electrical appliances without interference; On the contrary, there is no common impedance coupling, but there are many wires, which is not conducive to layout and increases the cost, so it is suitable for electrical appliances with large differences in working voltage and current.