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This paper presents a comparison of conducted EMI performance of Si and SiC MOSFETs in a CCM PFC boost converter that is designed to meet CE102 of MIL-STD- 461F. EMI performance comparison is based on MOSFET of the PFC converter. That is, the power switch of the converter is the only parameter that is changed during tests. The boost diode is kept the same during the tests and the type of the boost...
The high frequency high voltage (HFHV) transformer is one of the biggest contributors for conducted electromagnetic interference (EMI) emission of switching power supply. The transformer technologies for reducing conducted EMI emission focus on the shielding and changing the winding structures. However, for suppressing conducted EMI, the suppression capability of shielding is limited; current methods...
Electromagnetic interference (EMI) is a critical problem for pulsed magnet system, especially for those sophisticated measuring sensors used in synchrotron accelerator. The purpose of this paper is to estimate and reduce the conductive and radiated EMI from a kicker magnet and its power supply. A line impedance stabilization network system was implemented to measure the EMI spectrum of the kicker...
This paper presents a theoretical treatment of common-mode (CM) and differential-mode (DM) interaction that is known to exist in switch-mode converter systems. This analysis demonstrates that one important metric for evaluating this interaction (displacement currents through the module baseplate) can be quantitatively predicted through theoretical analysis of two types of asymmetry in the converter...
Randomized modulation schemes are often employed in single-phase switched-mode DC-DC converters, but they generally have a high output ripple noise voltage, and are yet to find applications in low-harmonics low-noise multi-phase converters. The modulation scheme of these multi-phase converters is usually the conventional Pulse Width Modulation scheme (PWM) that exhibit undesirable high switching-frequency...
The performance of the electromagnetic interference (EMI) filter under the condition without the Une impedance stabilization network (LISN) are revealed and analyzed from the perspective of the common mode (CM) and differential mode (DM) impedances of the switched-mode power supply (SMPS), AC mains, and LISN. The in-circuit CM and DM impedances of the SMPS, AC mains, and LISN are extracted with an...
In recent years, photovoltaic (PV) systems have been widely used for power generation and renewable energy. However, a lot of electromagnetic interferences (EMI), which will influence the normal performance and operation of other electrical devices, have been generated seriously by the PV converter, especially the conducted EMI noises from 9kHz to 30MHz. To mitigate the conducted EMI noises, the topology...
A complete test for conducted EMI from the direct current fed (DC-fed) alternating current (AC) motor drive system in an electric vehicle (EV) under load conditions is set up to analyze the conducted voltage and current of high voltage DC cables in a frequency range of 150 kHz–108 MHz at 500rpm and 2500rpm with 50Nm load torque of the EV motor with space vector pulse width-modulation (SVPWM) control...
Electromagnetic interference (EMI) is a concern for modern day wide bandgap (WBG) power electronic modules due to the increasing demand for fast and high frequency switching. In this paper, EMI issues due to parasitic ringing at turn-on and turn-off of silicon carbide (SiC) power devices are investigated. To illustrate the need for parasitic optimization to reduce EMI at turn-on and turn-off, wire...
As the switching frequency of switching power supply increases, its size become smaller and smaller. This phenomenon results in serious electromagnetic interference (EMI) problem. General passive EMI filter cannot meet the demand of size, weight, power losses and filter performance at the same time. Digital Active EMI Filters (DAEF) is a good choice, for it implement EMI suppression using digital...
This paper proposes a modeling methodology for the prediction of conducted EMI in the context of multi-physics optimizations. The study of the well-known DC-DC buck converter is chosen as illustration to validate this procedure. A bottom-up approach is used to model the entire structure. The modeling of switching cell, passive elements and also Printed Circuit Board (PCB) is presented. Models validation...
According to the software approaches for conducted EMI separation based on independent component analysis (ICA), this paper presents a simple method using signal statistics to eliminate the inherent indeterminacy of permutation, phase and amplitude of the separated sources. The premise of the study is that a line impedance stabilization network (LISN) is used as the conducted interference testing...
Common mode (CM) and differential mode (DM) conducted emissions without the line impedance stabilization network (LISN) is investigated from the perspective of CM and DM impedances. Using a switched-mode power supply (SMPS) as an equipment under test (EUT), the in-circuit CM and DM impedances of the actual measurement setup with and without LISN are extracted so that the deviation of conducted emission...
In power electronics system, high frequency range CM noise suppression is a great challenge on the issue of conducted EMI. People may think that a perfect EMI filter with little self parasitics and mutual parasitics would suppress HF noise well. However, it will be shown that the practice story is different. In this paper, besides the parasitics in EMI filter, some other factors which increase the...
Digital high-frequency arc welding inverter is widely used in welding areas because of its many advantages such as high efficiency, small size, easy to control etc. However, with the development of high frequency of the switching, the conducted EMI generated by arc welding inverter becomes increasingly serious, especially common mode conducted EMI. Based on Digital Active EMI Filter (DAEF) controller,...
This paper presents an analysis and comparison of boundary conduction mode (BCM) and continuous conduction mode (CCM) in single phase power factor correction (PFC) applications. The comparison is based on double pulse tester (DPT) characterization results of state-of-the-art superjunction devices in the 600V range. The measured switching energy is used to evaluate the devices performance in a conventional...
To demonstrate the impact of the line impedance stabilization network (LISN) on conducted electromagnetic interference (EMI) measurement, an in-circuit impedance extraction method based on inductive coupling approach is developed to extract the common mode (CM) and the differential mode (DM) noise impedances of AC mains, LISN, and switched-mode power supply (SMPS) under operating condition. By treating...
The conducted EMI simulation plays an important part in the SMPS in the product design. The analysis of common mode noise is much more complex than differential mode noise. The CE simulation accuracy depends on the accuracy of CM mode noise. CM noises are determined by the electric coupling between the voltage jump point and the ground. Traditional the CM models of the electric coupling between the...
This work presents a study of the influence of different gate driver circuits on the switching behavior of SiC MOSFET devices used in a buck converter. The paper is based on several tests performed to determine the switching times and switching losses, using different reverse bias VGS voltage levels and different passive RCD (Resistance Capacitor Diode) circuits to interface the driver to the SiC...
This paper investigates the relevant issues for experimental characterization of conducted EMI resulting from three-phase power electronics system. Terminal model is used to describe the EMI behavior. The theoretical analysis and equivalent terminal model for three-phase power electronics system are conducted and proposed respectively. The measurement setup which fulfills the requirement of parameter...
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