Reduction of Conducted Emissions in DC/DC Converters with FPGA-based Random Modulation

IEEE Electromagn. Compat. Mag.

Smoleński

et al. 2022

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This paper demonstrates that using conventional frequency scanning methods for the evaluation of conducted electromagnetic interference generated by DC/DC converters can give misleading results when pseudo-random modulation is used as part of the converter control scheme. The paper therefore proposes that the resolution bandwidth of the super heterodyne EMI test receiver used for measurements and the dwell time should be adjusted to match the control parameters of the random modulation scheme. The use of different values for resolution bandwidth and dwell time is demonstrated and measurements for random and fixed modulation schemes are compared.

Section: Frequency Modulated Dc/dc Convertersmentioning

confidence: 99%

Section: A Pseudo-random Modulationmentioning

confidence: 99%

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Impact of Pseudo-Random Modulation on Measured Conducted EMI

Peña-Quintal

IEEE Electromagn. Compat. Mag.

Smoleński

et al. 2022

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“…Hence, the setup provides controlling the switching signal based on pulse width modulation (PWM) [9], [10].…”

Section: Experimental Setup Descriptionmentioning

confidence: 99%

Low-Frequency Envelope of DC/DC Converters due Differences in the Control Hardware Features

Sayed

2021 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)

Madi

et al. 2021

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In conjunction with concerns about electromagnetic compatibility (EMC), the low-frequency envelope provided by the frequency beat produced from the aggregation of harmonics generated by multiple power electronic converters. The lowfrequency envelope becomes worrisome as the variations in the amplitude of electromagnetic interference (EMI) in the time domain, can influence the performance of the EMI detectors, e.g., average detector (AV). Therefore, this paper addresses the lowfrequency envelope provided by the frequency beat, using two DC/DC converters controlled by two different controllers: PXI-7854R and Atmega328P. The practical setup and EMI measurements are discussed in the EMC framework.

“…In addition, related to its application in a smart grid, its EMI is expected not to interfere with data communication. Thus, the design of PWM signals should consider how to minimize the effect of EMI, one of which is by using a random modulation technique (RanM) [3]- [5]. In this technique, the frequency switching (fsw) is shifted randomly in the frequency spectrum over time in the range of ±Δf [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Nonlinear ARX System Identification Technique on Modeling Crosstalk

Sudrajat

Wibisono

2022 IEEE International Symposium on Electromagnetic Compatibility &Amp; Signal/Power Integrity (EMCSI)

et al. 2022

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Estimating crosstalk appropriately is very important in the process of mitigating electromagnetic interference. This study evaluates a black-box modeling technique named nonlinear autoregressive with exogenous inputs (NARX) on crosstalk modeling application, especially crosstalk due to random pulse width modulation. The model is developed using the input and output data from the measurement as regressor inputs. For validation, the mean squared error of this model is calculated by comparing the model output with the real measurement output. For evaluation, the model performance also was compared to a Spice-based SACAMOS model. Although less flexible than the Spice model, NARX model can represent the signal on the victim cable well with a small mean squared error value.