EMC/EMI Filter Design with RB Common-Mode Chokes: Part 2
This application note presents a step-by-step method for designing EMC/EMI filters using Schaffner RB common-mode chokes. Using a 1.6 kW power supply example, it explains how to estimate differential-mode and common-mode noise, determine required attenuation, calculate filter corner frequencies, select suitable RB chokes, and size X and Y capacitors. The guide also covers leakage-current limits, capacitor selection, evaluation boards, and practical verification through CISPR 17 testing. Results show that theoretical calculations provide a strong starting point, while PCB layout, parasitic effects, and additional capacitors may be needed for optimal performance. Proper design accelerates compliance with EMC standards.
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