GaN: A Reliable Future in Power Conversion: Dramatic performance improvements at a lower cost

2015 ◽  
Vol 2 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Alex Lidow ◽  
Johan Strydom ◽  
Robert Strittmatter ◽  
Chunhua Zhou
Keyword(s):  
Lower Cost ◽  
Power Conversion ◽  
Performance Improvements ◽  
Dramatic Performance

Commercialization of High 600V GaN-on-Silicon Power Devices

2014 ◽  
Vol 778-780 ◽  
pp. 1174-1179 ◽  
Author(s):  
Primit Parikh ◽  
Yi Feng Wu ◽  
Li Kun Shen
Keyword(s):  
Power Systems ◽  
Energy Use ◽  
Lower Cost ◽  
Power Conversion ◽  
Electricity Consumption ◽  
Reducing Power ◽  
Electrical Energy ◽  
Performance Limits ◽  
Power Devices ◽  
Silicon Power Devices

With power conversion losses endemic in all areas of electricity consumption, broadlycategorized into motion control (accounting for around 50% of total electrical energy use), lighting,air conditioning, and information technology, consumers, governments and utilities are finding waysto achieve higher efficiency. Manufacturers of data servers, telecom systems, solar power invertersand drives for motor control are focused on reducing power conversion losses while simultaneouslyshrinking the size of power systems. Although silicon has historically been the base device materialused by the power conversion industry, it is rapidly reaching its physical performance limits. GaNsemiconductors solutions reduce power conversion loss by over 50% in a significantly smaller formfactor and at a lower cost, when device design, fabrication technology and application design areholistically combined to deliver superior end products.

scholarly journals A Switched Quasi-Z-Source Inverter with Continuous Input Currents

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1390 ◽  
Author(s):  
Jing Yuan ◽  
Yongheng Yang ◽  
Frede Blaabjerg
Keyword(s):  
Lower Cost ◽  
Renewable Energy Sources ◽  
Power Conversion ◽  
Experimental Tests ◽  
Superior Performance ◽  
Passive Components ◽  
Prior Art ◽  
Voltage Stress ◽  
Power Switches ◽  
Continuous Input

Impedance source converters as single-stage power conversion alternatives can boost and regulate the output voltages of renewable energy sources. Nevertheless, they, also known as Z-source inverters (ZSIs), still suffer from limited voltage gains and higher stresses across the components. To tackle such issues, extra diodes, passive components, and active switches can be utilized in the basic ZSIs. In this paper, a modified switched-quasi-Z-source inverter (S-qZSI) is proposed, which features continuous input currents and high boosting capability to boost output voltage by minor modifications of a prior-art topology. Furthermore, the voltage stress of the active switches is reduced, which contributes to a lower cost. The operation principles are discussed comprehensively. The performance of the proposed ZSI in terms of conversion ratio, voltage gain, and stresses on the power switches and capacitors is benchmarked with selected ZSIs. Finally, simulations and experimental tests substantiate the theoretical analysis and superior performance.

scholarly journals Robustness against read committed for transaction templates

2021 ◽  
Vol 14 (11) ◽  
pp. 2141-2153
Author(s):  
Brecht Vandevoort ◽  
Bas Ketsman ◽  
Christoph Koch ◽  
Frank Neven
Keyword(s):  
Experimental Evidence ◽  
Lower Cost ◽  
Database Systems ◽  
Robustness Testing ◽  
Performance Improvements

The isolation level Multiversion Read Committed (RC), offered by many database systems, is known to trade consistency for increased transaction throughput. Sometimes, transaction workloads can be safely executed under RC obtaining the perfect isolation of serializability at the lower cost of RC. To identify such cases, we introduce an expressive model of transaction programs to better reason about the serializability of transactional workloads. We develop tractable algorithms to decide whether any possible schedule of a workload executed under RC is serializable (referred to as the robustness problem). Our approach yields robust subsets that are larger than those identified by previous methods. We provide experimental evidence that workloads that are robust against RC can be evaluated faster under RC compared to stronger isolation levels. We discuss techniques for making workloads robust against RC by promoting selective read operations to updates. Depending on the scenario, the performance improvements can be considerable. Robustness testing and safely executing transactions under the lower isolation level RC can therefore provide a direct way to increase transaction throughput without changing DBMS internals.

Morphometric analysis of cellular interactions with the endothelium during the development of arterial lesions using Scanning Electron Microscopy and digital image analysis

1987 ◽  
Vol 45 ◽  
pp. 918-919
Author(s):  
M.E. Rosenfeld ◽  
C. Karboski ◽  
M.F. Prescott ◽  
P. Goodwin ◽  
R. Ross
Keyword(s):  
Electron Microscopy ◽  
Image Analysis ◽  
Quantitative Data ◽  
Digital Image Analysis ◽  
Lower Cost ◽  
Matched Control ◽  
Digital Analysis ◽  
Cellular Interactions ◽  
Arterial Lesions ◽  
Scanning Electron

Previous research documenting the chronology of the cellular interactions that occur on or below the surface of the endothelium during the initiation and progression of arterial lesions, primarily consisted of descriptive studies. The recent development of lower cost image analysis hardware and software has facilitated the collection of high resolution quantitative data from microscopic images. In this report we present preliminary quantitative data on the sequence of cellular interactions that occur on the endothelium during the initiation of atherosclerosis or vasculitis utilizing digital analysis of images obtained directly from the scanning electron microscope. Segments of both atherosclerotic and normal arteries were obtained from either diet-induced or endogenously (WHHL) hypercholesterolemic rabbits following 1-4 months duration of hypercholesterolemia and age matched control rabbits. Vasculitis was induced in rats following placement of an endotoxin soaked thread adjacent to the adventitial surface of arteries.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

A privileged ternary blend enabling non-fullerene organic photovoltaics with over 14% efficiency

2020 ◽  
Vol 8 (43) ◽  
pp. 15135-15141
Author(s):  
Jing Yan ◽  
Yuan-Qiu-Qiang Yi ◽  
Jianqi Zhang ◽  
Huanran Feng ◽  
Yanfeng Ma ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Power Conversion ◽  
Ternary Blend ◽  
Conversion Efficiencies

Two non-fullerene small molecule acceptors, NT-4F and NT-4Cl, were designed and synthesized. Power conversion efficiencies of 11.44% and 14.55% were achieved for NT-4Cl-based binary and ternary devices, respectively.

Global Restructuring, Knowledge and Learning

2004 ◽  
pp. 66-76
Author(s):  
E. Hershberg
Keyword(s):  
Economic Growth ◽  
Developing Countries ◽  
Political Institutions ◽  
Lower Cost ◽  
International Competitiveness ◽  
Value Chains ◽  
Global Competitiveness ◽  
Global Restructuring ◽  
Intensive Exploitation ◽  
High Road

The influence of globalization on international competitiveness is considered in the article. Two strategies of economic growth are pointed out: the low road, that is producing more at lower cost and lower wages, with increasingly intensive exploitation of labor and environment, and the high road, that is upgrading capabilities in order to produce better basing on knowledge. Restrictions for developing countries trying to reach global competitiveness are formulated. Special attention is paid to the concept of upgrading and opportunities of joining transnational value chains. The importance of learning and forming social and political institutions for successful upgrading of the economy is stressed.

Sign in / Sign up

Export Citation Format

Share Document