EMC/EMI Filter Design with RB Common-Mode Chokes: Part 1
This application note explains the design and application of Schaffner RB common-mode (CM) chokes for EMC/EMI filtering in power electronics. RB chokes support DC, single-phase, and three-phase systems and help reduce conducted electromagnetic interference while maintaining low losses and high power density. Available in low- and high-inductance versions, they balance noise attenuation, saturation tolerance, and current capability. The document discusses filter topology, common-mode and differential-mode noise suppression, mounting options, saturation limits, inductance behavior, and impedance characteristics. Ferrite-core RB chokes provide effective attenuation across typical conducted-emission frequencies, often matching or exceeding nanocrystalline chokes while offering higher saturation limits and lower losses.
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