What are the 11 basic principles that should be followed in EMC design?
When designing electronic circuits, many engineers focus only on functionality and overlook electromagnetic compatibility (EMC). This can lead to unwanted interference and failure to meet sensitivity requirements. To ensure proper EMC performance, several key considerations must be taken into account during the design phase.
Component selection plays a crucial role in achieving good EMC. The electromagnetic characteristics of basic components often determine how well a circuit or device meets EMC standards. When choosing components, it's important to consider their out-of-band performance and how they are assembled. In many cases, the way components are laid out on the board—such as lead length and proximity—can significantly affect electromagnetic behavior.
Here are the 11 key guidelines for effective EMC design:
(1) At high frequencies, prefer feedthrough or pedestal capacitors with low lead inductance over traditional leaded capacitors for filtering;
(2) If leaded capacitors are necessary, account for the impact of lead inductance on filtering efficiency;
(3) Avoid aluminum electrolytic capacitors in applications with large ripple or transient voltages, as they may experience temporary dielectric breakdown. Instead, use solid capacitors;
(4) Use resistors with minimal parasitic inductance and capacitance, especially for ultra-high frequency applications. Chip resistors are ideal for such cases;
(5) Avoid single-section filters at low frequencies due to high parasitic inductance and capacitance. Instead, use multi-section filters made from smaller inductors to improve insertion loss;
(6) Be mindful of core inductor saturation, particularly when dealing with high-level pulses. Saturation can reduce inductance and weaken filter performance;
(7) Whenever possible, use shielded relays and ground the shield casing to minimize interference;
(8) Choose input transformers that are well-shielded and isolated to prevent noise coupling;
(9) For sensitive circuits, use power transformers with electrostatic shielding, and ensure the shield is grounded;
(10) Always use shielded cables for internal signal connections to prevent crosstalk and coupling between signals;
(11) Use connectors with enough pins to properly connect all shields to their respective grounding points, ensuring effective shielding performance.
By following these principles, designers can significantly improve the electromagnetic compatibility of their products, reducing interference and ensuring reliable operation in real-world environments.
Radiators in this case are manufactured with Stainless steel (SS304, SS316 and SS316L).
These radiators are manufactured with both 1mm CRCA sheet and 1.2 mm CRCA sheet as required and centre distance varying from 600 mm to 4000 mm. Stainless steel radiators can be offered with and without paint.
Through the method, the stainless steel plate type radiator for the transformer is simple in structure, free of complex treatment process on the surface of the radiator, not prone to oxidizing and corroding, long in service life, and high in welding strength.
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