1. Solve the challenges of automotive EMC issues With the development of technologies such as new energy, car networking and ADAS, the number of automotive electronic products continues to increase, and the electromagnetic environment faced by automobiles is becoming more complex while meeting safety and comfort requirements. How to ensure the safety of functions, pass the EMC test and certification, and gain advantages in the fierce market competition is the concern of most manufacturers. The traditional method, relying on EMC testing and rectification to solve the electromagnetic compatibility problem, has the following drawbacks, and it is increasingly difficult to meet the needs of rapid product development: ♦ Strong blindness ♦ Post-commissioning test phase has a large workload ♦ Product development cycle is uncontrollable and risky ♦ EMC test costs are high At present, the mainstream international automotive electronics manufacturers solve the problem of automotive electronics EMC. From the perspective of forward design, the simulation tools are used to predict and analyze the EMC characteristics. The early detection problems are solved, and the hardware design is directly corrected to shorten the development cycle. , to reduce costs and improve the reliability of products. Based on the current mainstream simulation analysis tools in EMC simulation field, Hengrun Technology provides design simulation test services from electronic control PCB hardware design rule formulation, EMC characteristic pre-simulation analysis, hardware design rectification, and subsequent EMC test integration. 2. Automotive EMC Simulation Solution Cars contain a wide variety of electronic devices, and PCBs, cable harnesses, antennas, and low-frequency devices such as motors are all closely related to electromagnetic compatibility. In order to ensure that the various system devices work normally and are free from external interference and do not affect the work of other devices, various types of EMC problems need to be analyzed. • PCB board EMC simulation solution PCB is the most basic component of electronic products. It carries key components such as main chips, power supply network and high-speed interconnects in the system. Therefore, in order to ensure the EMC of the whole system, it is necessary to design a PCB with good EMC performance, and its EMC design. The optimization process is shown in the figure below. ♦ Pre-Layout analysis Perform pre-layout analysis before layout, establish the basis of design and effective constraints (such as stacking variables), optimize impedance mismatch and decoupling capacitors, and use parameter scanning to find the best solution. ♦ SI/PI/EMC rule check PCBLayout is checked using HypLynxDRC built-in rules or custom rules to identify designs in the layout that may cause SI, PI, and EMC issues, and is constantly reviewed and corrected at each design stage to avoid a long design cycle. ♦ SI/PI/EMC simulation analysis Perform SI analysis on the PCB, optimize the layout of key devices and signals on the PCB, reduce signal reflection and crosstalk; analyze the resonance and decoupling capacitance of the power plane, guide the decoupling capacitor layout, reduce the ground noise of the power supply; Part of the EMI analysis, identify the possible electromagnetic radiation intensity, and then optimize and improve in time, control harmful electromagnetic interference from the source, and improve the immunity. • System level EMC simulation solution The metal casing (if any) acts as a carrier for the entire system, providing a relatively closed electromagnetic environment for the internal equipment. Its shielding effectiveness is extremely important for controlling electromagnetic radiation; the cable is used to transmit signals to achieve power supply to the entire system, usually present A certain degree of coupling and electromagnetic radiation. Therefore, it is necessary to co-simulate the PCB, cable harness and chassis shell to investigate the EMC characteristics of the whole system. The EMC design optimization process is shown in the figure below. Use CST to model PCBs, connecting cables, and chassis enclosures, extract SPICE models of near-field sources or critical components of PCBs, analyze shielding effectiveness of metal enclosures, electromagnetic radiation from cables, and PCBs, cables, and enclosures. Comprehensive impact, the external electromagnetic interference of the whole system is investigated; and the sensitive characteristics of the whole system are investigated by externally applying interference sources; and then the over-standard part is optimized and improved according to the needs, so as to improve the reliability of the whole design. • Vehicle-level EMC simulation solution In the EMC analysis of the entire vehicle, it is necessary to refine the factors affecting the EMC characteristics of the vehicle, such as high-power equipment such as vehicle antennas, wiring harnesses, power supplies, motors and ignition coils, and other electromagnetic equipment, and consider the influence of the vehicle body. From the perspective of the whole vehicle, the mutual interference between electronic devices and the electromagnetic interference and electromagnetic sensitivity of the whole vehicle are analyzed. By using HyperLynx and CST simulation tools, you can achieve a full range of EMC solutions from lines, PCBs, components, harnesses, antennas to complete vehicle grades. In the EMC simulation analysis of the whole vehicle, it is necessary to first identify the main interference sources, transmission paths and devices that are susceptible to interference. Considering the influence of the strong interference system equipment/motor, the connection harness and the vehicle body in the vehicle, analyzing the crosstalk generated by the mutual coupling between the harnesses, and using the generated interference current as the interference source to investigate the influence on the vehicle body; Analyze the surface current of the vehicle body when the antennas are mutually coupled and the interference signals induced on the wiring harness inside the vehicle to investigate the EMC characteristics of the vehicle. 3. Automotive EMC test verification program In addition to a complete automotive electronics EMC simulation solution, Hengrun has a complete EMC test equipment and EMC laboratory for performance verification of the design product, in order to further examine the EMC characteristics of the product under real conditions. The EMC test is mainly divided into two aspects: electromagnetic interference and electromagnetic sensitivity test. The main contents are as follows. Based on the forward-designed EMC simulation solution, the virtual physical prototype is used to realize the parallel design and EMC problem analysis and optimization of the board level, system and vehicle level, and the later perfect EMC test verification can effectively solve the board level. From the system level to the vehicle-level automotive EMC problem, saving product development costs, shortening the development cycle, and improving the reliability of the entire product. 4. Summary This paper briefly introduces the design simulation test method and solution for solving automotive electronics EMC problems. Hengrun Technology Automotive Electronic Hardware Development and Testing Team has more than ten years of experience in EMC design simulation and testing. It can provide customers with complete turnkey projects from EMC design, EMC simulation analysis to EMC testing, and can help domestic automotive electronics customers improve their electronic products. EMC design and analysis capabilities to assist with rigorous EMC testing.
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Automotive Electronics EMC Design Simulation Test Integration Solution