Products are being delivered with higher switching frequencies, including ICs with frequency-spread spectrum and highly integrated power modules.Ĭonsider the advantages and disadvantages of a higher or lower switching frequency when creating your design. Packaging, efficiency, and costs drive the development of switching regulators. The direct field coupling is determined by the distance, design, and heights of the components (e.g. the switching regulator) are important, as the switching creates E and H fields. Decisions made in this stage can result in later problems that can only be solved through extensive efforts in redesigning the layout or conducting additional EMC measurements.įor example, the initial positions of plugs and function groups on the board (e.g. Mechanical designs require great attention be paid to EMC. The housing is based on cost structure, weight, and thermal concept. PCB size and connector positions for the cables are usually pre-defined by mechanical limitations. Concept and Technology for a EMC Testing Plan Requirements should be tracked throughout the process, especially for purchased parts. Companies who work with external suppliers and multiple customers should document all mutually understood requirements in the EMC test plan. Defining operation modes during testing is as important as the test set-up (grounding, wiring harness, load box, and software configurations). This document should allow an engineer to run their tests without additional documents and background knowledge. This plan is a working document to be updated during the first phase of the development, and acting as a central document for the testing and documentation phase of the project.Ī good EMC test plan defines and documents all relevant information about the equipment under test (EUT). While there is no guarantee that all limits and test levels will be met when the module is interconnected, defining requirements in advance significantly reduces this risk.Ī unique testing plan should be integrated into the development schedule. e-boosters, e-trains, onboard chargers) work in parallel.ĮMC testing planning process also benefits other industries, where products consist of subassemblies - some of which are not even developed in-house. Strict compliance with these requirements ensures that communication services (broadcast and mobile) and high-power electronics (e.g. Nearly every car manufacturer has their own EMC requirements with higher test levels and lower emission limits. However, meeting the legal requirements is not enough. Limits and test levels have become standardized, and risk assessments can be made based on component measurements alone. The automobile industry spent years defining the requirements for electronic components and subassemblies. On top of various EMC regulations, international standards and national standards must be met (see Figure 2).Īn example of this is the automobile industry, where the complexity of vehicle development involves additional requirements that ensures appropriate component interactions. Depending on the product and industry, different requirements must be fulfilled. A schedule ensures everyone involved knows the goals and requirements to sell a product to the end customer. With a clearly-structured EMC testing development process, these issues are easily avoided (see Figure 1).įigure 1: Structured EMC Testing Development Process Requirements and Testing Planīegin with the EMC testing project schedule. MPS’s goal is to offer technical support to customers and prepare them for future technical challenges. This intense pressure to deliver quickly often leads to EMC issues that only come to light during a project’s final phase. Because of this, compromises must often be made. You cannot see, hear or feel electromagnetic waves, which makes it difficult to determine influencing factors and structures.Įngineers today face roadblocks of greater complexity, as smaller package sizes often conflict with the economic goal of reducing cost and development time. However, few topics are as difficult to grasp as EMC. EMC Testing At A GlanceĮMC is the ability for electrical equipment to function properly in its electromagnetic environment without introducing intolerable disturbances to other equipment. These unexpected changes can result in shifted schedules, increased development costs, and external post-testing costs. In-house testing results are rarely as good as expected, and additional obstacles may arise during development. Lattice Semiconductor Reference DesignsĮlectromagnetic compatibility (EMC) testing can prove difficult for developers and project managers. Switching Converters and Controllers AECQ Grade.BLDC Pre Drivers and Integrated Solutions.Digital Isolators with Integrated Power.Multi Phase Controllers & Intelli-Phase.
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