Study of EMI filter performance without LISN based on noise impedances

Li, Kang-Rong; See, Kye Yak; Fan, Fei

doi:10.1109/apemc.2017.7975439

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…In the literature, only the magnitude is usually considered, and in practical applications it is quite common to talk about high or low source impedance only. However, with emerging technologies such as active EMI filtering techniques [1]- [4], information on the phase of the SMPS internal impedance is becoming of critical importance. Indeed, design methodologies not accounting for both magnitude and phase of SMPS modal impedances could This work has been supported by Schaffner Group, Switzerland.…”

Section: Introductionmentioning

confidence: 99%

Novel Measurement Procedure for Switched-Mode Power Supply Modal Impedances

Mazzola

Grassi

Amaducci

2020

IEEE Trans. Electromagn. Compat.

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The measurement of modal impedances of switching-mode power supplies (SMPS) is of paramount importance in EMC applications, especially when designing EMI filters to suppress the conducted and radiated electromagnetic emissions is the target. A novel measurement technique which makes use of an impedance analyzer and a coupling transformer and allows extracting the complex value of common and differential mode noise-source impedance of a SMPS is proposed. The measurement procedure is first studied from the theoretical point of view, then experimentally validated with passive components, and eventually implemented in a CISPR-25 conducted emission test set-up to measure the magnitude and phase of modal impedances of an automotive SMPS under different operation conditions.

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Section: Introductionmentioning

confidence: 99%

Novel Measurement Procedure for Switched-Mode Power Supply Modal Impedances

Mazzola

Grassi

Amaducci

2020

IEEE Trans. Electromagn. Compat.

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“…The impedance investigation takes more and more importance in active filtering, where the filter might run to instability and act as a noise amplifier if the external impedances are not suitable for the chosen topology, [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

Measuring the Noise Impedances of Switched-Mode Power Supplies

Mazzola

Grassi

Amaducci

2019

2019 IEEE International Symposium on Electromagnetic Compatibility, Signal &Amp; Power Integrity (EMC+SIPI)

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In this paper, a novel approach to complex impedance measurement is proposed, using an Impedance Analyzer (IA) connected to the system under investigation through a transformer, which allows direct measurement of the magnitude and phase of the common mode (CM) and differential mode (DM) impedance of a Switched-Mode Power Supply (SMPS) during working conditions. The theoretical analysis of the measurement circuit both for CM and DM impedances is provided as the first step. Then, a fine calibration process is explained and validated with passive components. Eventually, the proposed method is exploited for experimental evaluation of the CM and DM noise impedances of an automotive SMPS in a test setup for conducted emission verification.

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“…Through a comprehensive literature review, existing online impedance measurement technique includes the resonance method [51], the inductive coupling approach [53], and the ABCD network approach [31,54]. In this section, these three approaches are reviewed, and their merits and shortcomings are discussed.…”

Section: Impedance Extraction Methodsmentioning

confidence: 99%

Common mode filter design for mitigation of bearing degradation in inverter-fed Motor drive systems

Fan¹

Self Cite

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Recent advancements in the insulated-gate bipolar transistor (IGBT) enable higher switching speeds in power electronics and have improved the power conversion efficiency significantly. Hence, pulse width modulated (PWM) variable frequency drives (VFDs) are widely used in modern control of electro-mechanical drive systems. On the other hand, higher switching frequencies cause the presence of high-frequency commonmode (CM) voltage, which results in unwanted CM current flows through the motor bearing and leads to premature motor bearing failures, such as frosting, fluting and pitting. SPWM Sinusoidal Pulse Width Modulation VFD Variable-frequency Drive VNA Vector Network Analyzer This thesis is organized as follows: This chapter provides the introduction, background and motivation of the thesis. Chapter 2 gives a review of the bearing degradation issues for inverter-fed motor drive systems and commonly adopted mitigation methods. The causes of bearing voltage and four types of bearing currents are described in detail for the readers to appreciate the

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Study of EMI filter performance without LISN based on noise impedances

Cited by 4 publications

References 4 publications

Novel Measurement Procedure for Switched-Mode Power Supply Modal Impedances

Novel Measurement Procedure for Switched-Mode Power Supply Modal Impedances

Measuring the Noise Impedances of Switched-Mode Power Supplies

Common mode filter design for mitigation of bearing degradation in inverter-fed Motor drive systems

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