전기차 등 미래차에서의 전장품 탑재 증가로 고집적화 되고 있는 추세에 노이즈 이슈도 함께 증가하고 있다. 이에 선제적인 EMI/EMC 대응과 대책 설계가 제품 개발 프로세스에 큰 이점을 제공할 것으로 기대되는 가운데 e4ds Analog Day 세미나에서 이와 관련된 EMI/EMC 인사이트들이 공유됐다.

▲2023 e4ds Analog Day
Latest issues and technologies on the topic of EMX response to future vehicle electrical components
Sharing design theory, motor noise analysis, reduction cases, AEF, etc.
Automotive-related HW design developer participation is high and satisfaction is high
As the number of electrical components installed in future vehicles such as electric vehicles increases and integration becomes more advanced, noise issues are also increasing. Accordingly, preemptive EMI/EMC response and countermeasure design are expected to provide great benefits to the product development process, and related EMI/EMC insights were shared at the e4ds Analog Day seminar.
The 2023 e4ds Analog Day was held on the 28th at the Korea Conference Center in Seocho-gu, Seoul.
This seminar, hosted by e4ds news, was themed ‘Response to EMX (Electromagnetic Everything) of Future Vehicle Electrical Components’ and included presentations on EMI/EMC countermeasure design technology.
This event, in which many designers of hardware related to automotive and electrical components, PCBs and products, participated, provided a forum for sharing EMI/EMC issues, design theories, and countermeasure cases in preparation for future automobiles with highly integrated semiconductors and electrical components.
In the morning session, Dr. Jong-Hoon Kim (CEO of EMC Doctors, Chairman of the EMC Technology Research Group of the Korean Electromagnetic Engineering Society) conducted a session on EMC countermeasure design technology for future vehicle electrical components. He introduced EMC countermeasure design technology that can be applied from the early design stage for future vehicle electrical component design and development engineers.
.jpg)
▲Dr. Kim Jong-hoon conducting a session on design technology for EMC measures for future vehicle electrical components
As the proportion of electrical systems in automobiles continues to increase, the trend toward increased system operation speed and higher integration is intensifying. Accordingly, Dr. Kim Jong-hoon particularly emphasized the automotive electrical component design process that takes EMI/EMC into account from the early design stage.
In addition, the core management variables of △RE occurrence principle and reduction technology in EMC countermeasure design, △EMI reduction design technology, etc. were explained, and EMC design samples and the design and development process of automotive electrical systems were shared.
The three sessions held in the afternoon were: △Professor Ikjae Yoon of Chungnam National University presented on noise analysis techniques for vehicle drivetrains (motors); △Dr. Junsang Lee (Senior Researcher at Altair) presented on principles and cases of high-frequency noise management and EMC debugging technology for vehicle wireless communication/embedded systems; and △Professor Jinkook Kim of UNIST presented on active EMI filter design technology for reducing conductive EMI.
Professor Yoon Ik-jae shared the reasons why EMC-aware design is necessary for electric vehicle motors, design methodology, RE/CE prediction, and preventive design. Professor Yoon said, “Antennas will be a key component in wireless systems,” and focused on EMC-aware design to prevent unwanted energy transfer from antennas. Insights were shared, including: △Simulation-based motor radiation emission characteristic prediction and reduction design, and △vehicle noise transmission path analysis techniques.
Professor Yoon explained the method of predicting radiation emissions through motor high-frequency modeling, its effectiveness, and areas for improvement, adding, “It is difficult to predict all noise in a vehicle with integrated electrical equipment, but we must still know the location of noise generation and transmission path to build a database that can be improved in the next-generation model.”
Dr. Lee Jun-sang mentioned the increasing installation of wireless communication systems in automobiles, showing a prominent trend in which wireless communication is being incorporated into automobile functions, such as △LF, UHF △Wi-Fi 802.11p △NFC △4G LTE, 5G cellular, etc. △remote keys △infrastructure and V2V △wireless communication devices △base stations.

▲Dr. Lee Jun-sang
The doctor presented various case studies on EMI reduction technologies, including impedance matching, PDN low resonance, differential signal design, multi-conductor system on ground, and technical shielding and grounding.
Professor Kim Jin-guk said in his presentation, “There is a need to reduce conductive EMI noise radiated through power lines connected to the grid, such as systems that require charging and discharging with high current or products with high power consumption such as industrial air conditioners.” He added that EMI countermeasures not only exceed the standards, but also suppression through passive filters inevitably faces many challenges.
Conventional passive EMI filters consume a lot of power.As the cross-sectional area of the wire increases, the size of the choke increases inefficiently. In addition, large chokes are prone to magnetic saturation and are vulnerable to heat generation problems. The material solution to this problem is a choke with rare earth elements added, but this is only a solution with a trade-off relationship as it increases the unit price.
Professor Kim said, “As power electronics devices develop tremendously and the area of advanced converters based on SiC and GaN becomes extremely small, EMI filters tend to be overlooked during the design process.” He added that active EMI filters are currently attracting attention for their advantages such as low cost, light weight, and low heat generation.
However, commercialization has been slow so far due to lack of verification of reliability issues such as durability of components in surges. Recently, as the trend toward high power consumption intensifies, the need for active EMI filters is rapidly increasing, and it is reported that research to solve reliability issues is gaining momentum.