The automotive industry has changed drastically in recent years. Advancements in technology paired with tighter federal fuel and emissions regulations have resulted in the need to place more electrical systems into vehicles. This in turn places a greater emphasis on keeping the Electromagnetic Interference (EMI) of these systems from interfering with each other through radiated and conducted emissions, as well as crosstalk between the multitudes of on-board systems.
Ethernet’s success in the marketplace is undeniable, and market-driven standardization has been instrumental in its success. It’s a cycle of synergistic innovation and market growth that has been spinning for decades. Ethernet has become entwined with almost every pattern and process of every-day life around the world. Whether a personal computer (PC) has a direct connection to a router or an indirect connection through a “Wi-Fi®” access point, it is highly likely that Ethernet is providing the connection to the Internet.
Industry standards play a major role in providing meaningful metrics and common procedures that allow various manufacturers, customers, and suppliers to communicate from facility to facility around the world. Standards are increasingly important in our global economy.
This article deals with improving EMC measuring methods that are used during the development of automobiles in the field of interference emissions. Development-stage investigations are normally performed with measuring systems that have actually been conceived for vehicle component tests. EMC measuring methods that are tailored to the development stage, however, are much better suited for this task since they help save time and costs. One such measuring method is presented here as a practical example.
The equipment should have passed the emissions scan. It should not be susceptible to this noise. The filter analysis said this was not a problem. The case should be an excellent shield. Why doesn’t this pass?
There are two statements I have heard about electromagnetic interference which are both related and true: EMC is the science and engineering of things that are typically not on the schematic , and EMI is often caused by issues of geometry . The first statement speaks to the issues of parasitics, or cross coupling of energy due to magnetic induction or capacitance. The second says that the parasitics can be controlled or reduced if the proper routings and separations are maintained, and that once a degree of understanding about these coupling mechanisms is understood the control of them can be obtained.
China is becoming the largest consumer market in the world. Electronic equipment especially high-tech devices are most popular in China. An attractive market, yes, but are you prepared to enter this vast marketplace? Like any country in the world, China has its own regulations for electronic equipment. China Compulsory Certification (CCC) is the most widespread certification you need to overcome.
What does “certification” mean to you? What is the value of becoming “certified?” The answer to this question has to include an answer to another question, “what is being certified?” In the electrostatic control arena, the world’s premier organization for education and standards development is the EOS/ESD Association, Inc.
Considering EMC techniques during the design phase will minimize EMC problems and avoid disasters uncovered at EMC test time. At this time, the remedial measures are usually very painful.
In the typical case, where the electronic equipment is contained within a single enclosure, enclosure shielding along with cable filtering or shielding are commonly employed to meet EMC requirements.