EMI Filter Design
You said can you help me design filter to remove the switching frequency harmonics from H50-500 /B/Y 24V to 500V DCDC Converter from American Power Design You said wont i be needing any common mode filter? Gemini said You are absolutely correct to be thinking about that. While Differential Mode (DM) filtering handles the ripple between the power lines, Common Mode (CM) noise is almost always present in high-frequency switching converters, especially those handling high voltage differences like the 500V output on the H50-500. Common mode noise stems from rapid voltage changes ( d t d v ) acting on parasitic capacitances between the switching components and the chassis ground. Why You Need a Common Mode Filter Without a CM filter, that 100 kHz noise (and its harmonics) can radiate from the output cables, interfering with nearby electronics or preventing you from passing EMI regulations (like FCC or CISPR). Designing the Filter For this application, I recommend a two-stage approach: 1...