The Effect of Spread Spectrum Modulation for a Buck Converter Coupled with a Single Wired Communication Link

Peña-Quintal, Angel; Niewiadomski, Karol; Muneeswaran, V.; Greedy, Steve; Sumner, Mark; Thomas, David William

doi:10.1109/emc/si/pi/emceurope52599.2021.9559276

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Poor EMC in 2-150 kHz may compromise the functional aspects of communication links & smart metering. Moreover, the serial communication coupling may promote poor EMC in this frequency range as well [15].…”

Section: Spectral Aggregation (2-150 Khz)mentioning

confidence: 99%

Influence of Impedance Interaction & Comparability on Spectral Aggregation (2–150 kHz) in DC Grids

Khilnani

Peña-Quintal

Ballukja

et al. 2022

2022 International Symposium on Electromagnetic Compatibility – EMC Europe

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The reported higher levels of conducted emissions in DC grids in the 2-150 kHz range are caused by the spectral aggregations resulting from the converter's switching harmonics. The dominant influence for these spectral aggregates is the impedance correlation between the DC-link capacitor and the converters. This paper analyses the impedance interaction & comparability between the DC-link and the DC/DC converters at the point of common coupling in the DC grid. Simulations with four DC-link capacitors and forty parallel DC/DC converters are conducted, with full (non-linear) and equivalentsource (linear) models for comparison. The dBµV values for the first spectral aggregate decrease as the augmenting DCside impedance becomes comparable with the smaller DC-link impedance, lowering the electromagnetic interference in the DC grid. This understanding may provide insights into the DClink capacitor design from an electromagnetic compatibility perspective, and towards developing a framework for DC power quality standards in the 2-150 kHz range.

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Section: Spectral Aggregation (2-150 Khz)mentioning

confidence: 99%

Influence of Impedance Interaction & Comparability on Spectral Aggregation (2–150 kHz) in DC Grids

Khilnani

Peña-Quintal

Ballukja

et al. 2022

2022 International Symposium on Electromagnetic Compatibility – EMC Europe

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“…Therefore, assuming that the research literature indicated, in addition to what was highlighted above, that RanM can improve the switching frequency content of the converter input waveforms [139]. Furthermore, that evaluating the output harmonic voltage becomes essential since the PWM techniques determine the moments of switching actions.…”

Section: Emc-test Bench Systemmentioning

confidence: 99%

“…One of the most important things to consider when using RanM is to not make the voltages worse. The research in [139] presents an interesting investigation into the possible effects of adopting the RanM in a Buck Converter, analyzing both the output and input voltages of the Buck Converter in the time domain and in the frequency domain. To compare the impact of using RanM over DetM the RMS values were obtained in [139].…”

Section: Emc-test Bench Systemmentioning

confidence: 99%

“…Among the cases presented in [139], the input voltage when the converter works with DetM presented the RMS value of 141.80 V, on the other hand when the converter works with RanM the RMS value was 141.37 V. While for the output voltage, the RMS values obtained in this case were 69.90 V when DetM was used, while a value of 68.84 V was measured for RanM. Thus, the usage of the RanM did not impact excessively the RMS voltage value of the input and output of the converter when compared to the DetM technique, which is also corroborated by the simulations presented in [77].…”

Section: Emc-test Bench Systemmentioning

confidence: 99%

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Modulation Algorithms of Power Electronic Converters for Shaping of Conducted Interference

Loschi¹

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Remarkably, over the last few decades, the electromagnetic interference within 9 to 150 kHz was especially accentuated since the switching frequency of power electronic converters is still limited to several kHz. Thus, bringing up the debate on regulation. From the point of view of the electromagnetic interference noise shape, two cases represent the extremes of possibilities among the various possible converter control algorithms: the deterministic and pseudo-random modulation.Pseudo-random modulation has been considered a complementary methodology to achieve electromagnetic compatibility, jointly with the electromagnetic interference filters and improvements on the printed circuit board layouts. The pseudorandom modulation methodology has also been utilized as prior-art for the reduction of converter power losses while achieving a target control dynamics or system power density or cost, and/or to achieve a flattening of power efficiency curves as function of processed power, and to improve control dynamics in transient operations. Notwithstanding, the impact of pseudo-random modulation on measured conducted electromagnetic interference is still unclear for the low frequency range.For instance, evaluating any electromagnetic interference noise spreading approach is not apparent once it depends on several pseudo-random modulation parameters, dwell time and resolution bandwidth. The conventional super-heterodyne frequency band stepping EMI test receiver defines the dwell time and the resolution bandwidth. For this reason, historically, pseudo-random modulations have been questioned and accused of being a fraudulent way of passing regulations. Nonetheless, research has been presented over the last decades to support the electromagnetic interference noise spreading approach in practical situations, e.g., with power line communication systems.Thus, the research carried out and presented in this thesis, all in all, proposed pseudo-random modulation control algorithms with a random stream based on different methods. The National Instruments PXI with Field-Programmable Gate Array was used as a cyber-physical platform for fast prototyping. This engineering tool enables the necessary electromagnetic interference investigations. The detail Field-Programmable Gate Array implementation and benchmarking of each studied methods are given. Although pseudo-random modulation methods exist previously to this v VI SUMMARY thesis work, the main novelty of the proposed developments lies in the identification and selection of the most suited random stream method for the problem at hand, and its necessary modification for implementation in a fixed-point processor. In this way demonstrating that it is possible to develop new, dedicated converter control algorithms that allow shaping the spectrum of disturbances to meet standardization or technical requirements.Furthermore, once it has been found that the conventional EMC test based on frequency scanning might not be sufficient to evaluate pseudo-random modulated DC/DC converter appropri...

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Interference of Periodic and Spread-Spectrum-Modulated Waveforms with Analog and Digital Communications

Crovetti

Musolino

2022

IEEE Electromagn. Compat. Mag.

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The Effect of Spread Spectrum Modulation for a Buck Converter Coupled with a Single Wired Communication Link

Cited by 3 publications

References 10 publications

Influence of Impedance Interaction & Comparability on Spectral Aggregation (2–150 kHz) in DC Grids

Influence of Impedance Interaction & Comparability on Spectral Aggregation (2–150 kHz) in DC Grids

Modulation Algorithms of Power Electronic Converters for Shaping of Conducted Interference

Interference of Periodic and Spread-Spectrum-Modulated Waveforms with Analog and Digital Communications

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