As switching power supplies become ubiquitous in modern electronics – from EV chargers and industrial controls to consumer appliances and communication hardware, managing Electromagnetic Interference (EMI) has never been more critical.

Our latest white paper Common Mode Chokes for AC Line Voltages ≥ 80V, breaks down exactly how Common Mode Chokes work as the frontline defence against high-frequency noise in mains-powered equipment, and why choosing the right one for your application matters more than you might think.

One key insight from the paper: not all winding structures are created equal. The choice between sectional and bifilar winding has a direct impact on isolation voltage, interwinding capacitance, and differential-mode attenuation, and getting it wrong in a high-voltage design can mean failed EMC certification or compromised safety.

The white paper covers the physics behind CMC behaviour, a practical comparison of winding topologies for 80–265Vac applications, and a view of Ole Wolff’s product series – including options for high-power, low-power, and custom nanocrystalline core designs.

To find out which CMC topology is right for your next design, download the full white paper here.