Current Status of SiC Power Switching Devices: Diodes & GTOs

1999 ◽  
Vol 572 ◽  
Author(s):  
S. Seshadri ◽  
A. K. Agarwall ◽  
W. B. Hall ◽  
S. S. Mani ◽  
M. F. MacMillan ◽  
...  
Keyword(s):  
High Temperature ◽  
Pulse Width ◽  
Current Status ◽  
Process Technology ◽  
Power Switching ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
First Time ◽  
Made In ◽  
Switching Devices

ABSTRACTThe progress that has been made in SiC diodes and GTOs is reviewed. A 100 A/1000 V SiC pi- n diode package, the highest current rating reported for any SiC device, a 69 A conduction/ 11 A turn-off of a SiC GTO and MTOTM, as well as the first all-SiC, 3 phase Pulse Width Modulated (PWM) inverter are reported, herein, for the first time. The inverter achieves voltage controlled turn off with a high temperature capable, hybrid SiC JFET. Material and process technology issues that will need to be addressed before device commercialization can be realized are discussed.

scholarly journals Modified SHE for Grid Connection.pdf

2019 ◽  
Author(s):  
Subhendu Bikash Santra
Keyword(s):  
Pulse Width ◽  
Single Phase ◽  
Mixed Model ◽  
Theoretical Concept ◽  
Multiple Solution ◽  
Voltage Source ◽  
Numerical Techniques ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Laboratory Prototype

<div>This paper presents an improved selective harmonics elimination technique for PV assisted single phase</div><div>grid-tied pulse width modulated (PWM) voltage source</div><div>inverter (VSI). The switching angles are determined offline</div><div>through numerical techniques and stored in microcontroller</div><div>memory as a function of modulation index md for online</div><div>application. For multiple solution, the solution which leads to</div><div>lower change of switching angles (α) from the previous md, is considered for storing in the processor memory. This leads to less no. of sections for the processor when a piecewise mixed model is considered for storing the entire switching angle curve. This technique is well suited for limiting voltage THD in two level grid connected VSI with L-C filter. The verification of theoretical concept is done in laboratory prototype of PV (500 W) connected to grid-tied PWM inverter. The control environment is realized in embedded FPGA interfaced national instrument hardware.</div>

SiC Power Electronic Devices, MOSFETs and Rectifiers

1999 ◽  
Vol 572 ◽  
Author(s):  
J. A. Cooper ◽  
S-H. Ryu ◽  
Y. LI ◽  
M. Matin ◽  
J. Spitz ◽  
...  
Keyword(s):  
Material Science ◽  
Materials Science ◽  
Electronic Devices ◽  
Commercial Production ◽  
Significant Fraction ◽  
Current Status ◽  
Power Electronic ◽  
Power Switching ◽  
Figures Of Merit ◽  
Switching Devices

ABSTRACTSiC power switching devices have demonstrated performance figures of merit far beyond the silicon theoretical limits, but much work remains before commercial production will be feasible. A significant fraction of the remaining work centers on materials science issues. This paper reviews the current status of unipolar power switching devices in SiC and identifies the major technological and material science barriers that need to be overcome.

scholarly journals Simulation and modeling of high voltage DC to AC PWM inverter for electrostatic generator

2018 ◽  
Vol 189 ◽  
pp. 11010
Author(s):  
S. M. A. Motakabber ◽  
M. Wahidur Rahman ◽  
Muhammad Ibn Ibrahimy
Keyword(s):  
High Voltage ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Cost Effective ◽  
Modern Technology ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Electrostatic Generator ◽  
Lc Filter

This paper proposes a single-phase DC to AC inverter for ESG (electrostatic generators) that may be used in the household’s application. The electrostatic generators were developed a while ago and remained abandoned for a long time. Now, as the modern technology advanced, it’s time to utilize the ESG to power generation. A pulse width modulation (PWM) based high voltage DC to AC inverter is a suitable system for converting the EGS high electrostatic DC voltage into standard 50Hz, 220V(rms) AC. The PWM technique is used to control the inverter switches to create a pulse width modulated bi-phase square wave signal. A lowpass LC filter has been utilized to remove the higher harmonic frequencies and which is capable to reduce the total harmonic distortion (THD) around 3.5%. The proposed model showed the overall system performance in terms of efficiency is 95%. To use ESG, this inverter is an easy and cost-effective electrical device. From the result, it is observed that the output voltage of the proposed inverter is greatly improved compared to the other inverter circuits.

scholarly journals Modified SHE for Grid Connection.pdf

2019 ◽  
Author(s):  
Subhendu Bikash Santra
Keyword(s):  
Pulse Width ◽  
Single Phase ◽  
Mixed Model ◽  
Theoretical Concept ◽  
Multiple Solution ◽  
Voltage Source ◽  
Numerical Techniques ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Laboratory Prototype

<div>This paper presents an improved selective harmonics elimination technique for PV assisted single phase</div><div>grid-tied pulse width modulated (PWM) voltage source</div><div>inverter (VSI). The switching angles are determined offline</div><div>through numerical techniques and stored in microcontroller</div><div>memory as a function of modulation index md for online</div><div>application. For multiple solution, the solution which leads to</div><div>lower change of switching angles (α) from the previous md, is considered for storing in the processor memory. This leads to less no. of sections for the processor when a piecewise mixed model is considered for storing the entire switching angle curve. This technique is well suited for limiting voltage THD in two level grid connected VSI with L-C filter. The verification of theoretical concept is done in laboratory prototype of PV (500 W) connected to grid-tied PWM inverter. The control environment is realized in embedded FPGA interfaced national instrument hardware.</div>

Psychological Resilience Provides No Independent Protection From Suicidal Risk

Crisis ◽  
2016 ◽  
Vol 37 (2) ◽  
pp. 130-139 ◽  
Author(s):  
Danica W. Y. Liu ◽  
A. Kate Fairweather-Schmidt ◽  
Richard Burns ◽  
Rachel M. Roberts ◽  
Kaarin J. Anstey
Keyword(s):  
Risk Factors ◽  
Well Being ◽  
Current Status ◽  
Psychological Resilience ◽  
Cross Sectional ◽  
Life Project ◽  
Resilience Factors ◽  
First Time

Abstract. Background: Little is known about the role of resilience in the likelihood of suicidal ideation (SI) over time. Aims: We examined the association between resilience and SI in a young-adult cohort over 4 years. Our objectives were to determine whether resilience was associated with SI at follow-up or, conversely, whether SI was associated with lowered resilience at follow-up. Method: Participants were selected from the Personality and Total Health (PATH) Through Life Project from Canberra and Queanbeyan, Australia, aged 28–32 years at the first time point and 32–36 at the second. Multinomial, linear, and binary regression analyses explored the association between resilience and SI over two time points. Models were adjusted for suicidality risk factors. Results: While unadjusted analyses identified associations between resilience and SI, these effects were fully explained by the inclusion of other suicidality risk factors. Conclusion: Despite strong cross-sectional associations, resilience and SI appear to be unrelated in a longitudinal context, once risk/resilience factors are controlled for. As independent indicators of psychological well-being, suicidality and resilience are essential if current status is to be captured. However, the addition of other factors (e.g., support, mastery) makes this association tenuous. Consequently, resilience per se may not be protective of SI.

PERSPECTIVE DEVELOPMENT OF WORLD PRODUCTION OF FEEDS FOR AQUACULTURE: ALTERNATIVE SOURCES OF RAW MATERIALS

2017 ◽  
pp. 67-78
Author(s):  
Lina Yurievna Lagutkina
Keyword(s):  
Raw Materials ◽  
Limiting Factors ◽  
Current Status ◽  
Feed Production ◽  
The World ◽  
Market Trends ◽  
Alternative Sources ◽  
World Industry ◽  
First Time ◽  
A Current

The author of the article discloses the prospects of development of the world feed production for aquaculture based on the analysis of key innovative technological and market trends. The author specifies that shortage, high cost, low ecological compatibility of traditional raw materials - fish flour - are among major limiting factors in the development of production of feeds for aquaculture. This fact, in turn, limits sustainable development of aquaculture both in Russia, and in the world in general. The article presents the overview of a current status of the world industry of feed production in aquaculture, where the regional situation is studied, as well. For the first time, there is given the outlook of innovative technologies in feed production based on the alternative sources of protein (on the example of projects of leading aquabiotechnological companies) which will determine industry’s objectives for the mid-term perspective.

Mosses and lichens of Shokalsky Island (Kara Sea, Yamal-Nenets Autonomous Area)

2020 ◽  
Vol 54 (2) ◽  
pp. 497-513 ◽  
Author(s):  
L. N. Beldiman ◽  
I. N. Urbanavichene ◽  
V. E. Fedosov ◽  
E. Yu. Kuzmina
Keyword(s):  
Plant Communities ◽  
Species Distribution ◽  
Arctic Tundra ◽  
Kara Sea ◽  
Lichenicolous Fungi ◽  
South West ◽  
West Part ◽  
First Time ◽  
Nenets Autonomous ◽  
Made In

We studied in detail a moss-lichen component of Shokalsky Island vegetation for the first time and identified 79 species of mosses and 54 species and 2 subspecies of lichens and lichenicolous fungi. All species of mosses and 23 species and 2 subspecies of lichens and lichenicolous fungi are recorded for the first time for the island. The study is based on collections made in South West part of the island, in arctic tundra. We also explored the participation of the mosses and lichens in the main types of plant communities and the species distribution in 10 ecotopes. The paper describes the noteworthy findings (Abrothallus parmeliarum, Aongstroemia longipes, Arthonia peltigerea, Caloplaca caesiorufella, Catillaria stereocaulorum, Ceratodon heterophyllus, Lecanora leptacinella, Sphagnum concinnum, S. olafii) and features of bryo- and lichenoflora of Shokalsky Island.

MULTIMET (N-155)

Alloy Digest ◽  
1961 ◽  
Vol 10 (12) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Age Hardening ◽  
Nickel Chromium ◽  
Cobalt Nickel ◽  
Temperature Performance ◽  
High Oxidation ◽  
Scaling Resistance ◽  
Made In

Abstract MULTIMET alloy is cobalt-nickel-chromium-iron austenitic alloy having high oxidation and scaling resistance along with good high-temperature properties. It tends to work harden but does not respond significantly to age-hardening. It is made in a wrought grade (0.08-0.16% carbon) and a casting grade (0.20% max. carbon). This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-28. Producer or source: Haynes Stellite Company. Originally published May 1955, revised December 1961.

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