Suppression: An important step towards series production
At Mooser, the suppression of electronic components has been an integral part of the portfolio for decades. Use this unique know-how to start with us at an early stage in the direction of series production.
Developed an electrical or electronic component, built the first prototype, tested it and then discovered EMC problems: what now? We will get your project back on track with professional and rapid troubleshooting.
Elimination is a holistic process
The sooner the better
When it comes to interference suppression, it’s the same as with medical check-ups: the earlier, the better. Ideally, you bring your electronic components to our laboratories as an A or B sample for EMC testing. Then the electromagnetic compatibility will be optimized much more effectively and, above all, more cheaply than in later development phases.
Because the top guiding principle for electromagnetic compatibility is: EMC cannot be tested in the system, it must be developed and designed into the system right from the start. An EMC development in the vehicle is time-consuming and uneconomical, since EMC measurements in the finished vehicle are only possible shortly before SOP. In the event of problems, there is almost no time for subsequent developments.
Well-known measurement technology is the basis for successful interference suppression
In principle, interference suppression measurements are comparable to the usual qualification measurements and we also take place in the same measuring chambers. They are based on the same standards and limit values that the OEMs specify for qualification measurements of their components. The common interference frequencies that radiate from the components or impair them are measured. If they are above the limit values, we eliminate interference from the component until all relevant parameters are below the limit values at the end.
Step by step to trouble-free components
The first step is your call as soon as you discover EMC problems with your electronic component to be developed. Then we will make you a fair offer and carry out an initial measurement on your test item as an inventory. Based on these first characteristic values as well as the layout data and circuit diagrams of your component, we identify problem areas and define remedial measures.
For example, we localize sources of interference on circuit boards and then suppress them professionally, for example by changing the wiring, more precisely fitting electronic components, filters or modifying the circuit board layout or the circuit. We carry out this work with a high level of craftsmanship using a soldering iron. The test specimen is then measured again. Depending on the result, the point of interference is processed again or the next source of interference is optimized. As soon as the provisional layout meets all the requirements for the EMC measurements, we hand it over to the customer, who builds a modified, new component on this basis.
Our interference suppression process offers tangible advantages
This manual approach has the advantage that we can check the effectiveness of every change immediately afterwards. This saves time and quickly brings a valid result. Secondly, with the provisional new layout, our customers receive a literally “graspable” blueprint for the optimized component, which they can then replicate 1:1. The design of the modified component is best left in the hands of the customer, since he knows best about his sourcing specifications and design guidelines.
Proven interference suppression process for all voltage levels
Our interference suppression process, which has grown and been optimized over decades, has proven itself just as well with low-voltage components with 12 and 24 volts as with high-voltage components. However, with high-voltage components one naturally has to reckon with a greater potential for interference, which tends to be coupled into the low-voltage range, for example in the inverter. This is why our comprehensive fault clearance know-how and problem-solving skills are particularly in demand at the interfaces between the voltage levels.
The greatest challenge for the suppressor is usually the localization of the EMC interference. Certain “basics” are indispensable for this demanding task. The Mooser employee must have a very good understanding of the connections between the electronics and the various physical effects, and he must be able to “read” the circuits and layouts, in other words, be able to see all of their characteristics and possible problem areas at a glance. This specialist knowledge cannot be learned at school, it is acquired over years or even decades in everyday work through “learning by doing”.
Fault clearance is a service with a future
With the “interference suppression” service, we support customers who have a certain level of EMC competence but perhaps do not have that in-depth knowledge of interference suppression. Our market success over the past decades with several hundred successfully completed interference suppression projects shows that you as a customer value this service very much. As always, with a fault clearance order, contact is made via your personal project supervisor, who will support you from the beginning to the end of our cooperation. Internally at Mooser, he also regulates the professional and rapid fault clearance of your electronic components.
Future trends such as drives electrified with high-voltage technology (increased EMC interference potential) and automated driving (sensitive and safety-relevant functions) open up a new field of conflict. Through professional interference suppression of electrical or electronic components in the early development phase, we work together with you to ensure that this conflict of objectives does not arise in the first place.
Frequently asked Questions
Electrical or electronic components can emit EMC interference and their function can be impaired by external EMC interference. This is why standards and guidelines regulate that all of these components fall below the limit values for interference emissions and must be robust against external EMC interference. If these limit values are not met during EMC measurements, the components must be redesigned. The process of design changes and accompanying control measurements until all limit values are met is called interference suppression.
The top guiding principle for electromagnetic compatibility is: EMC cannot be checked into the system, it must be developed and designed into the system right from the start. The EMC development of the components in the vehicle is time-consuming and uneconomical, since EMC measurements in the finished vehicle are only possible shortly before SOP. In the event of problems, there is almost no time left for troubleshooting and modifying the components. In addition, the test item has to be removed from the vehicle and reinstalled later, which is time-consuming. This leads to a lot of time and a blockage of valuable test bench capacities. For this reason, Mooser recommends troubleshooting electronic components as early as the A or B sample phase, because changes are then technically easier to implement and therefore more cost-effective, and are largely uncritical in terms of time.
A specialist in interference suppression must have a very good understanding of the relationships between electronics and the various physical effects, and he must be able to “read” circuits and layouts, i.e. be able to see all of their characteristics and possible problem areas at a glance. In addition, there is a good feeling for promising modifications and their technically sound implementation. This comprehensive profile of requirements can only be learned to a limited extent in vocational training; most of the skills can only be acquired in day-to-day work through “learning by doing”.
For four decades, Mooser has seen itself as a problem solver with a comprehensive portfolio. We support our customers in all aspects of electromagnetic compatibility – from the test preparation to the actual EMC measurements in our high-performance test chambers and the discussion of the results to recommendations for further component development. We accompany all these processes with a high level of craftsmanship and technical competence. For example, we develop many of our measuring cabins ourselves and carry out the measurements ourselves. Thanks to our well-trained and continuously trained employees, we were also able to build up the suppression of electronic components as an important part of our broad-based corporate philosophy.
