![]() ![]() The major source of EMI in SMPS power supplies can be traced to their inherent design nature and switching characteristics. ![]() During product development, it is usually almost impossible to determine the impact of EMI on potential victims, as such, EMI control efforts are usually focused on minimizing emission sources (or reducing susceptibility), and eliminating/reducing coupling paths. Solving any EMI problem generally requires an understanding of the source of interference, the coupling path to other circuits (victims), and the nature of the victim whose performance is negatively affected. With more devices (potential EMI victims/source) being developed every day, overcoming EMI is becoming a major challenge for engineers and achieving electromagnetic compatibility (EMC) is becoming as important as getting the device to function correctly.įor today’s article, we will look at the nature and sources of EMI in SMPS, and examine some design techniques/approaches that can be used in mitigating them. However, beyond the complexity of their designs, SMPS presents a significant EMI generation threat due to the fast switching frequencies they employ, to attain the high efficiency for which they are known. They are characterized by high efficiency, small form factor, and low-power consumption, which has made them the power supply of choice for new electronic equipment/products, even though they are significantly more complex and difficult to design compared to used-to-be-popular Linear Power Supplies. Switch Mode Power supply is a generic term for AC-DC or DC-DC power sources that use circuits with fast switching actions for voltage transformation/Conversion (buck or boost). We will kick things off with minimizing EMI in Power supply units with a specific focus on Switch Mode Power Supplies. The article was followed by another one on Electro Magnetic Compatibility (EMC) which provided insights into the dangers of EMI and offered some context to how poor EMI consideration could negatively affect the market performance of a product, either due to regulation clampdowns or functionality failures.īoth articles contain broad tips for minimizing EMI (Outgoing or Incoming) in design, but over the next few articles, we will take a deeper dive and examine how to minimize EMI in certain functional units of your electronic product. In my previous article on EMI, we examined how the intentional/unintentional nature of EMI sources and how they affect the performance of other Electrical/Electronic devices (victims) around them. ![]()
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