The Basics of Conducted Emissions Testing for Switch-Mode Power Supply Designs
Switch-Mode Power Supply (SMPS) technology has enabled a high level of efficiency in power conversion for electronic devices. By switching a MOSFET at very fast frequencies, it is possible to convert AC/DC voltages and currents to another form. However, SMPS technology has drawbacks such as the generation of switching harmonics. Converter waveforms are not a pure sinusoid and, consequently, they can generate unwanted signals that are integer multiples of the fundamental switching frequency, which are also known as harmonics. The operating topology chosen and the switching patterns deployed will directly influence the magnitude of harmonics generated. This makes pre-compliance conducted emissions testing an essential step in SMPS design.
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