EMI Noise Separation Method for Three-Phase WBG Inverters With Low Sensitivity to Parasitic Parameters

2018 ◽  
Vol 33 (6) ◽  
pp. 4589-4593 ◽  
Author(s):  
Yu Zhang ◽  
Yanjun Shi ◽  
Hui Li
Keyword(s):  
Separation Method ◽  
Three Phase ◽  
Parasitic Parameters ◽  
Low Sensitivity

scholarly journals Low sensitivity of three-phase bone scintigraphy for the diagnosis of repetitive strain injury

2006 ◽  
Vol 124 (3) ◽  
pp. 145-149 ◽  
Author(s):  
Bárbara Juarez Amorim ◽  
Elba Cristina Sá de Camargo Etchebehere ◽  
Graciella Dalla Torre ◽  
Mariana da Cunha Lopes de Lima ◽  
Allan de Oliveira Santos ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Bone Scintigraphy ◽  
Visual Analysis ◽  
Clinical Signs ◽  
Repetitive Strain Injury ◽  
Control Group ◽  
Upper Limbs ◽  
Three Phase ◽  
Repetitive Strain ◽  
Low Sensitivity

CONTEXT AND OBJECTIVE: The diagnosis of repetitive strain injury (RSI) is subjective and solely based on clinical signs and physical examination. The aim of this paper was to assess the usefulness of three-phase bone scintigraphy (TPBS) in diagnosing RSI. DESIGN AND SETTING: Prospective study at the Division of Nuclear Medicine, Department of Radiology, School of Medical Sciences, Universidade Estadual de Campinas (Unicamp). METHODS: Seventy-three patients (mean age 31.2 years; 47 males) with clinical suspicion of RSI in the upper limbs were studied. A total of 127 joints with suspicion of RSI were studied. The shoulders, elbows and wrists were analyzed semi-quantitatively, using the shafts of the humeri and ulnae as references. The results were compared with a control group of 40 normal individuals. The patients’ signs and symptoms were used as the "gold standard" for calculating the probabilities. RESULTS: From visual analysis, abnormalities were observed in the flow phase for four joints, in the blood pool phase for 11 joints and in the delayed images for 26 joints. Visual analysis of the joints of the control group did not show any abnormalities. Semi-quantitative analysis showed that most of the patients’ joint ratios were normal. The exceptions were the wrists of patients with left-sided RSI (p = 0.0216). However, the sensitivity (9%) and accuracy (41%) were very low. CONCLUSION: TPBS with semi-quantitative analysis has very low sensitivity and accuracy in the detection of RSI abnormalities in the upper limbs.

scholarly journals Research on Three Phase Signal Separation Method and Device for Live Detection of Circuit Breaker Contact Ablation Degree

2021 ◽  
Vol 2005 (1) ◽  
pp. 012081
Author(s):  
Chao Wang ◽  
Jianlong Wang ◽  
Dong Sun ◽  
Sichen Dong ◽  
Jie Yang ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Separation Method ◽  
Signal Separation ◽  
Three Phase ◽  
Phase Signal

Online Neofuzzy Neuron Flux Observer for Induction Motor Drives

2002 ◽  
Vol 6 (2) ◽  
pp. 84-92 ◽  
Author(s):  
Regis P. Landim ◽  
◽  
Francisco A. S. Neves ◽  
Selenio R. Silva ◽  
Walmir M. Caminhas** ◽  
...  
Keyword(s):  
Digital Simulation ◽  
Motor Drives ◽  
Flux Observer ◽  
Three Phase ◽  
Input Signals ◽  
Fuzzy Neural ◽  
Rotor Flux ◽  
One Step ◽  
Low Sensitivity ◽  
Wide Speed Range

This paper presents an algorithm for three-phase induction motors rotor flux observation based on a neofuzzy neuron (NFN) network with real-time training featuring quick accurate convergence, great adaptability to system dynamics, good performance over a wide speed range, and low sensitivity to parameter variations (rotor and mutual inductances and rotor resistance) and disturbances. The observer requires only rotor speed and stator current measurements as input signals and. its fuzzy-neural network does not need previous training. Convergence in one step is demonstrated and the influence of the learning rate on performance is analyzed. Both digital simulation and experimental results are presented and show the observer good overall performance.

scholarly journals Matrix Extraction of Parasitic Parameters and Suppression of Common-Mode Conducted Interference in a PMSG-IDOS Rectifier Module

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 206
Author(s):  
Jinfeng Liu ◽  
Chunjian Xia ◽  
Lantian Liu ◽  
Xudong Wang
Keyword(s):  
Extraction Method ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Synchronous Generator ◽  
Common Mode ◽  
Three Phase ◽  
The Matrix ◽  
Parasitic Parameters ◽  
Backward Control ◽  
The Common

The rectifier module is the key part of a permanent magnet synchronous generator integrated DC output system (PMSG-IDOS) with low-voltage and high-current. The high-speed switching device of the rectifier module is the main source of electromagnetic interference (EMI). In this paper, the matrix extraction method is proposed to establish an accurate conducted interference model, and a 3D crimped SiC MOSFET model is established via Ansoft Q3D simulation software. The matrix of the parasitic parameters between poles of the MOSFET is simulated to extract the accurate parasitic parameters. Furthermore, a high-precision conducted interference simulation model of the pulse width modulation (PWM) rectifier system is established. Then, the space vector pulse width modulation (SVPWM) jump-backward control strategy based on the three-phase four-leg structure is proposed to suppress the common-mode interference, and the comparison with other two methods is carried out based on this model. Finally, the experimental platform of a 5 V/1000 A synchronous generator with rectifier is constructed, and conducted interference is tested in accordance with the simulated results. It demonstrates the accuracy of the model with parasitic parameters based on the matrix extraction method. This paper provides a more simple and effective reference method for the prediction study of conducted interference in power converter systems. After comparing the simulation results with the experimental results, it is proven that the SVPWM jump-backward control strategy based on the three-phase four-leg structure can ensure the output balance of the bridge leg and allow the common-mode (CM) interference to reach the ideal state.

Design of Sensitive Photographic Materials for the High-Voltage Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 156-157
Author(s):  
Murray Vernon King ◽  
Donald F. Parsons
Keyword(s):  
Electron Microscope ◽  
Radiation Damage ◽  
High Voltage ◽  
Radiation Sensitivity ◽  
Fast Electrons ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Biological Studies ◽  
Low Sensitivity

Effective application of the high-voltage electron microscope to a wide variety of biological studies has been restricted by the radiation sensitivity of biological systems. The problem of radiation damage has been recognized as a serious factor influencing the amount of information attainable from biological specimens in electron microscopy at conventional voltages around 100 kV. The problem proves to be even more severe at higher voltages around 1 MV. In this range, the problem is the relatively low sensitivity of the existing recording media, which entails inordinately long exposures that give rise to severe radiation damage. This low sensitivity arises from the small linear energy transfer for fast electrons. Few developable grains are created in the emulsion per electron, while most of the energy of the electrons is wasted in the film base.

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