Strategic Overview of High-Voltage SiC Power Device Development Aiming at Global Energy Savings

2014 ◽  
Vol 778-780 ◽  
pp. 1089-1095 ◽  
Author(s):  
Lin Cheng ◽  
John W. Palmour ◽  
Anant K. Agarwal ◽  
Scott T. Allen ◽  
Edward V. Brunt ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Energy Savings ◽  
System Size ◽  
Pulsed Power ◽  
Power Device ◽  
Current Status ◽  
Variable Speed ◽  
Device Development ◽  
Compact Pulsed Power

Advanced high-voltage (≥10 kV) silicon carbide (SiC) devices described in this paper have the potential to significantly impact the system size, weight, high-temperature reliability, and cost of modern variable-speed medium-voltage (MV) systems such as variable speed (VSD) drives for electric motors, integration of renewable energy including energy storage, micro-grids, traction control, and compact pulsed power systems. In this paper, we review the current status of the development of 10 kV-20 kV class power devices in SiC, including MOSFETs, JBS diodes, IGBTs, GTO thyristors, and PiN diodes at Cree. Advantages and weakness of each device are discussed and compared. A strategy for high-voltage SiC power device development is proposed.

scholarly journals Pulsed Power Applications for Protein Conformational Change and the Permeabilization of Agricultural Products

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6288
Author(s):  
Koichi Takaki ◽  
Katsuyuki Takahashi ◽  
Alexis Guionet ◽  
Takayuki Ohshima
Keyword(s):  
Power Systems ◽  
Conformational Change ◽  
Electric Fields ◽  
Food Processing ◽  
Cell Membranes ◽  
Pulsed Power ◽  
Agricultural Products ◽  
Activity Change ◽  
Protein Conformational Change ◽  
Compact Pulsed Power

Pulsed electric fields (PEFs), which are generated by pulsed power technologies, are being tested for their applicability in food processing through protein conformational change and the poration of cell membranes. In this article, enzyme activity change and the permeabilization of agricultural products using pulsed power technologies are reviewed as novel, nonthermal food processes. Compact pulsed power systems have been developed with repetitive operation and moderate output power for application in food processing. Firstly, the compact pulsed power systems for the enzyme activity change and permeabilization are outlined. Exposure to electric fields affects hydrogen bonds in the secondary and tertiary structures of proteins; as a result, the protein conformation is induced to be changed. The conformational change induces an activity change in enzymes such as α-amylase and peroxidase. Secondly, the conformational change in proteins and the induced protein functional change are reviewed. The permeabilization of agricultural products is caused through the poration of cell membranes by applying PEFs produced by pulsed discharges. The permeabilization of cell membranes can be used for the extraction of nutrients and health-promoting agents such as polyphenols and vitamins. The electrical poration can also be used as a pre-treatment for food drying and blanching processes. Finally, the permeabilization of cell membranes and its applications in food processing are reviewed.

scholarly journals Influence of Field Spacer Geometry on the Performance of a High Voltage Coaxial Type Transmission Line with Solid Dielectric Spacer in Vacuum

2017 ◽  
Vol 7 (3) ◽  
pp. 1605-1610
Author(s):  
A. P. Anagha ◽  
K. Sunitha
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
High Voltage ◽  
Electrical Breakdown ◽  
Pulsed Power ◽  
Peak Voltage ◽  
Surface Flashover ◽  
Pulse Distortion ◽  
Positive Angle ◽  
Microwave Sources

With the development of more powerful high power electromagnetic sources, the transmission of high voltage power particularly between pulsed power systems to huge power rated microwave sources in absence of electrical breakdown and pulse distortion has begun to become a vital issue. A high voltage coaxial type transmission line with 500 kV peak voltage in vacuum is proposed. A novel proposal of configuration bearing a positive angle of 45o with socket-type filed shaper is being discussed in this paper in a manner to improve surface flashover properties and also to decrease the distortion seen in the pulse shape. This type of transmission line provides high capability of hold off voltage. The electric field distribution of the coaxial geometry with different field shaper configurations and different spacer parameters are also investigated using COMSOL software.

scholarly journals A Method to design composite insulation structures based on reliability for pulsed power systems

2014 ◽  
Vol 32 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Liang Zhao ◽  
Jian-Cang Su ◽  
Xi-Bo Zhang ◽  
Ya-Feng Pan ◽  
Rui Li ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Applied Field ◽  
Statistical Distribution ◽  
Pulsed Power ◽  
Practical Design ◽  
The Common ◽  
Solid Liquid ◽  
Applied Fields ◽  
Weibull Statistical Distribution

AbstractA method to design the composite insulation structures in pulsed power systems is proposed in this paper. The theoretical bases for this method include the Weibull statistical distribution and the empirical insulation formula. A uniform formula to describe the reliability (R) for different insulation media such as solid, liquid, gas, vacuum, and vacuum surface is derived. The dependence curves of the normalized applied field onRare also obtained. These curves show that the normalized applied field decreases rapidly asRincreases but the declining rates corresponding to different insulation media are different. In addition, ifRis required to be higher than a given level, the normalized applied field should be smaller than a certain value. In practical design, the common range of the applied fields for different insulation media should be chosen to meet a global reliability requirement. In the end, the proposed method is demonstrated with a specific coaxial high-voltage vacuum insulator.

scholarly journals Energy balance aspect in KALI-30 GW high-voltage pulse power source

2014 ◽  
Vol 32 (4) ◽  
pp. 531-535 ◽  
Author(s):  
Archana Sharma ◽  
S. Mitra ◽  
Senthil K. Vishnu Sharma ◽  
Sandeep Singh ◽  
S.V. Tewari ◽  
...  
Keyword(s):  
Energy Balance ◽  
Power Systems ◽  
High Voltage ◽  
High Voltage Pulse ◽  
High Energy ◽  
Pulsed Power ◽  
Marx Generator ◽  
Voltage Level ◽  
Insulation Failure ◽  
Pulse Power Source

AbstractThis paper elaborates the effect of unmatched stored energy in high-voltage high-energy pulsed power systems. High-voltage insulation failure of KALI system is analyzed thoroughly for its occurrence. According to the simulations and analysis energy mismatch of MARX generator and Blumlein transmission line is found to be the most significant cause for high-voltage failure of the system. MARX generator and Blumlein of KALI are redesigned to attain better energy balance at same voltage level. Observations, simulation and analytical results are illustrated in the following sections.

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