—

WellCircuits offers professional EMC design services! Our EMC team comprises experts from renowned enterprises and research institutions, bringing extensive experience and advanced technology to the table. We specialize in analyzing schematic diagrams, single-board construction, and high-speed signal simulation for SI PCB layouts. Through strategic measures such as meticulous component selection, we ensure comprehensive resolution of EMC issues for your products. Feel free to contact us for inquiries!

**Why is EMC Design Necessary for Products?**

EMC design is essential to meet product functionality requirements, reduce debugging time, and ensure compliance with electromagnetic compatibility standards. This ensures that your product does not cause electromagnetic interference with other equipment in the system.

**What Aspects Does Our EMC Design Cover?**

Our EMC design services encompass circuit design (including device selection), PCB layout, shielding structures, signal and power line filtering, and circuit grounding design, among others.

—

This revision maintains the original content while enhancing clarity and professionalism, ensuring it effectively communicates the services offered by WellCircuits.

Basic Principles of EMC Design:

Electronic circuit designers often prioritize the functionality of their products over electromagnetic compatibility (EMC). Consequently, while achieving the desired product function, they inadvertently generate significant electromagnetic emissions and susceptibility issues. To address these challenges, EMC design for electronic circuits should encompass the following considerations:

1. **Component Selection:** The electromagnetic characteristics of fundamental circuit components largely determine the EMC performance of functional units and final equipment. Key selection criteria for appropriate electromagnetic components include bandwidth characteristics and assembly techniques. EMC success often hinges on component response characteristics well beyond the fundamental frequency. Circuit assembly, such as lead length, significantly influences out-of-band response and coupling between circuit components.

2. **Specific Guidelines:**

– At higher frequencies, filtering using through-hole capacitors or low lead inductance support capacitors is preferred over leaded capacitors.

– When leaded capacitors are necessary, consider the impact of lead inductance on filtering effectiveness.

– Circuits with high ripple or transient voltages should employ solid capacitors due to the risk of temporary dielectric breakdown in aluminum electrolytic capacitors.

– Use resistors with minimal parasitic inductance and capacitance; chip resistors are suitable for the UHF band.

– Large inductors exhibit significant parasitic capacitance; to enhance low-frequency insertion loss, opt for multi-section filters composed of several smaller inductors rather than single-section filters.

– When using core inductors, consider saturation characteristics carefully, particularly in high-level pulse scenarios that can reduce inductance and filter insertion loss.

– Utilize shielded relays and ground their shielding shells.

– Select effective shielding and isolate input transformers.

– Ensure power transformers for sensitive circuits feature electrostatic shielding, with grounded shielding and transformer shells.

– Employ shielded cables for interconnecting signal wires within equipment to prevent disturbance coupling.

– Use plug bases with adequate pins to connect each shield separately.

These principles serve as foundational steps in achieving robust EMC design for electronic circuits, mitigating electromagnetic interference and ensuring compliance with sensitivity requirements.