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[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - EMI Analysis of a High Power Silicon Carbide Two-level Inverter
摘要： Successive generations of aircraft demand more electrical energy as pneumatic and hydraulic systems are replaced with electrical components. The more electric aircraft (MEA) transformation aims to improve fuel economy, increase reliability, and lower operating costs. To fully enjoy the benefits of an additional improvements in the power density of the electrical distribution system are required. Silicon carbide (SiC) devices have many advantages over their silicon (Si) counterparts that can lead to improvements in the power density. However, their characteristically switching speeds can result in higher levels of electromagnetic interference (EMI). This research compares the performance of two high power three phase inverters; one is built from SiC MOSFETs and the other from Si IGBTs. The efficiency and conducted EMI are measured at a DC bus of 540 V and an output power exceeding 25 kW.
关键词： Silicon Carbide,Electromagnetic Interference (EMI),More Electric Aircraft
更新于2025-09-23 15:23:52
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[IEEE 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Barcelona, Spain (2019.9.2-2019.9.6)] 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Propagation of Laser-Driven Electromagnetic Pulses in Laser Target Areas
摘要： During high intense laser target interaction a strong electromagnetic pulse (EMP) is generated which can potentially disturb the well performing of the experiment. The electromagnetic interference (EMI) due to the EMP not only affects devices present in the vacuum chamber but also in the target area where it may compromise the performance or operation of electronics and device controllers. In this work we report the measurements of EMP inside the laser target area at Centro de Laseres Pulsados (CLPU) during high intense laser-target interaction experiments. The experimental results show how the amplitude and spectrum of the EMP in the target area is different from the one inside the target chamber (TC). At last Finite element method (FEM) simulation results are shown and compared with experimental results.
关键词： laser-plasma interaction,Electromagnetic interference (EMI),High Intense laser,Electromagnetic Pulse (EMP),Finite Element Method (FEM) simulations
更新于2025-09-16 10:30:52
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[IEEE 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Barcelona, Spain (2019.9.2-2019.9.6)] 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Evaluation of Electromagnetic Noise Radiated from Tube-type LED Lamps and Its Effect on Wireless Medical Telemetry Systems
摘要： Light-emitting diode (LED) lamps have been widely introduced in the healthcare field. On the other hand, electromagnetic interference with wireless medical telemetry systems by switched-mode power supplies built in LED lamps has been a serious problem. We have investigated electromagnetic noise radiated from bulb-type LED lamps and its effect on wireless medical telemetry systems. In this study, we focus on tube-type LED lamps and investigated the statistical characteristics of electromagnetic noise radiated from them. Additionally, the critical reception of wireless medical telemetry systems subjected to interference by tube-type LED lamp installation was investigated.
关键词： light-emitting diode (LED),Gaussian approximation,receiver sensitivity,switched-mode power supply,wireless medical telemetry system,impulsive noise,electromagnetic interference (EMI)
更新于2025-09-16 10:30:52
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Analysis and Modeling of Conducted EMI From an AC–DC Power Supply in LED TV up to 1 MHz
摘要： Critical conduction mode (CRM) boost power factor correction (PFC) converter is widely used in ac–dc power supplies to achieve high power factor. The switching frequency varies in a half-line cycle. In this article, both the differential-mode (DM) and common-mode (CM) electromagnetic interference (EMI) noises below 1 MHz from the ac–dc power supply in a LED TV are analyzed and modeled. The power supply consists of two parts: CRM boost PFC converter and LLC resonant converter. The conducted EMI noise and noise source voltages are measured in the time domain and then converted to the frequency domain via short-time fast Fourier transform (STFFT). Through the joint time-frequency analysis using STFFT, the drain-to-source voltage of the power MOSFET in the PFC converter is identified as the dominant noise source of both CM and DM EMI below 1 MHz from the power supply. The EMI current path changes during different periods of a cycle of the line voltage. During most time of a cycle, two diodes of the bridge rectifier are forward biased, and the bridge rectifier can be treated as short circuit. The current paths of DM and CM EMI are explained and modeled by a linear equivalent circuit model. Three parasitic capacitances need to be considered to model the CM EMI noise in this device under test. From the circuit model, transfer functions relating DM and CM EMI spectra to noise source voltage spectrum are obtained. The conducted EMI spectra is predicted by multiplying the spectrum of noise source voltage by the transfer functions. The prediction matches with measurement. The effects of parasitic capacitances on CM EMI noise are analyzed by simulation and then validated by measurement. The analysis can help with EMI design to reduce the CM EMI.
关键词： conducted emissions (CE),differential mode (DM),Common mode (CM),electromagnetic interference (EMI),switched-mode power supply (SMPS),critical conduction mode (CRM),power factor correction (PFC)
更新于2025-09-12 10:27:22
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Common Mode Noise Reduction of 3-level Active Neutral Point Clamped Inverters with Uncertain Parasitic Capacitance of Photovoltaic Panels
摘要： SiC devices can upgrade the inverter performance to a new level by its potentially more than 10 times higher switching speed compared to its Si counterpart. Whereas, the high switching frequency and dv/dt, di/dt worsen the electromagnetic interference (EMI). Reduction of the common mode (CM) noise of the non-isolated photovoltaic (PV) inverters are addressed by many researchers through adding filters or balancing the circuit. However, most methods rely on the certainty of the parasitics in the system in advance. It is usually not practical for a PV inverter because the parasitic capacitance of PV panels that are to be installed in plants varies from case to case and further can be seriously affected by the damp environment. This paper proposes a practical way to reduce the CM noise of the 3-level (3L) active neutral point clamped (ANPC) inverters with uncertain parasitic capacitance of PV panels. Firstly, the CM model of ANPC inverters with all parasitic capacitances is established. Next, most existing hardware-based reduction methods of the CM noise are summarized based on a unified mathematical model and further compared with each other. After the comparison, a practical method is proposed to reduce the CM noise of the ANPC inverter with uncertain parasitic capacitances, which just adds little volume and cost to the whole system. Finally, the simulation and experiments are conducted to validate the proposed method.
关键词： EMI elimination,common mode (CM),active neutral point clamped (ANPC) topology,electromagnetic interference (EMI),Uncertain parasitic capacitance
更新于2025-09-11 14:15:04