Conducted emission analysis of DC-DC converters and proper selection of pre-filtering stage

An Approach to Identify Noise-Source Parameters of DC–DC Converter and Predict Conducted Emissions With Different Loads

“…The unknown current source I Rx=10 s1 at each frequency is calculated by (5) and is shown in Fig. 8(a).…”

“…7, we can see that the identified noise source value decreases with increasing load value. With the consideration of interpolation accuracy and simplicity of calculation, we, therefore, propose the natural cubic spline interpolation method to approximate the I s1 without a parameter identification process as (5), where I Rx s1 is the unknown current source with load value R x [10]…”

“…Several studies have examined the load effect on conducted emissions [4], [5]. Kostov et al [4] investigated the conducted emissions from an SiC-based boost converter working under different conditions and found that the conducted emissions above 20 MHz increased with the load current.…”

“…This indicates that the load is not independent of the EMI for the converter, which needs to be considered in the EMI modeling process. Yousaf et al [5] suggested that the switching condition depends on load and investigated conducted emissions with various loads. They found that when the output load increased, the fundamental switching frequency and its harmonics were shifted to a higher frequency range because the internal operation condition changed with the load.…”

Investigating the EMC Performance of a Matrix Converter and Measures to Improve It

“…A converter is one of those equipment. Converters are used on board of ships for the conversion of power either from AC-AC, AC-DC, or DC-DC [2]. For this purpose, conventional and matrix converters have been used.…”