Estimating the Radiated Emissions from Cables Attached to a Switching Power Supply in a MIL-STD 461 Test
Common-mode currents on cables attached to a switching power supply generate radiated emissions which may interfere with near-by components. A relatively simple equivalent circuit model is developed to predict the radiated emissions measured in a MIL-STD-461 or RTCA/DO-160 test. The intent of this model is to provide an estimate of emissions that allows the designer to better understand the mechanisms behind emissions issues and to rapidly predict the impact of changes to the system, like adding filtering, changing components, or modifying cable connections. The model represents cables connected to the power supply as transmission lines, represents coupling from the cables to the antenna using lumped capacitors, and represents the balun in the antenna using a transformer. The simulated results match the measured results well. This simple SPICE model allows EMI issues to be investigated early in the design of switched mode power supplies.
G. Li et al., "Estimating the Radiated Emissions from Cables Attached to a Switching Power Supply in a MIL-STD 461 Test," Proceedings of the 2013 IEEE International Symposium on Electromagnetic Compatibility (2013, Denver, CO), pp. 626-631, Institute of Electrical and Electronics Engineers (IEEE), Aug 2013.
The definitive version is available at https://doi.org/10.1109/ISEMC.2013.6670487
2013 IEEE International Symposium on Electromagnetic Compatibility (2013: Aug. 5-9, Denver, CO)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Biconical Antenna; EMI Modelling; MIL-STD 461D; Radiated Emissions; Switched Mode Power Supplies
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Article - Conference proceedings
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01 Aug 2013