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• The U.S Department of Energy launched the PowerAmerica Institute under the initiative of “National Network of Manufacturing Institutes (NNMI)” to Accelerate Adoption Wide Band Gap (WBG) power devices • PowerAmerica started operations in 2015 with $140M funds over 5 years, and is managed by North Carolina State University in Raleigh, NC USA • PowerAmerica addresses gaps in technology to enable manufacturing...
Distributed generation in the power grid will result in considerable efficiency improvement and increase in reliability and stability of the grid. And DC microgrids have clear benefits such as higher reliability, higher efficiency, better compatibility with DC loads, expandability and etc., over their AC equivalent systems. Although DC microgrids have clear advantages over the AC microgrids, but there...
Solid-state transformers or so called flexible high-frequency (HF) distribution transformers are likely to become a more efficient inter-connection between medium voltage (MV) AC grids and low voltage (LV) DC grids which can eventually be connected to DC microgrids. This paper addresses the main challenges in order to implement this technology. High-Frequency Transformers (HFTs) are one of the key...
DC microgrids are gaining popularity due to the higher efficiency, reliability, lower costs and better compatibility with DC loads compared to their AC counterparts. Large-scale deployment of distributed renewable energy resources like solar in the microgrids, has to provide utilities and grid operators the capability to safely and reliably mitigate the impact of solar and loads intermittency on the...
TSV-Free Interposer (TFI) technology eliminates TSV fabrication and reduces manufacturing and material cost. Co-design modelling methodology is established for TFI technology with considering wafer process, package assembly and package/board level reliability and thermal performance to optimize structure design, wafer process, assembly process and material selection. Experimental results are used...
Cloud computing and virtualization go hand in hand and have provided unlimited opportunities for Information Technology (IT) to achieve dynamicity and flexibility in the provisioning of value based services to the cloud end users including large business enterprises. However one of the primary obstacles to widespread acceptance of the cloud are the complex issues of security and the consequent lack...
Cloud computing presents unlimited prospects for Information Technology (IT) industry and business enterprises alike. Rapid advancement brings a dark underbelly of new vulnerabilities and challenges unfolding with alarming regularity. Although cloud technology provides a ubiquitous environment facilitating business enterprises to conduct business across disparate locations, security effectiveness...
Overall performance of the voltage source converters (VSCs) has improved during the recent years. Improvement of the VSCs along with the attractive features of the VSC based high voltage direct current (HVDC) transmission systems over the thyristor based HVDC transmission systems make it possible to build multiterminal (MT) VSC HVDC transmission systems. However, the VSCs are vulnerable against dc...
For both power/ground and data carrying TSVs, TSV resistance is preferred to be as low as possible. Power/ground TSVs should exhibit larger TSV capacitance so that TSV can act as a decoupling capacitor while data TSVs should exhibit low TSV capacitance enabling larger data rates. Monolithic integration scheme employing the annular isolation ring to isolate the data and power/ground TSVs is proposed...
Liquid cooling for thermal management has been extensively applied in high power electronic systems. However, the use of pumps may introduce reliability and mechanical limitations such as vibration, noise, leakage, and considerable power consumption. It has been shown that temperature sensitive ferrofluids in the presence of temperature field and magnetic field gradients are able to produce a liquid...
The objective of this paper is to come up with a scalable modular hardware solution for real-time Face Recognition (FR) on large databases. Existing hardware solutions use algorithms with low recognition accuracy suitable for real-time response. In addition, database size for these solutions is limited by on-chip resources making them unsuitable for practical real-time applications. Due to high computational...
This paper presents two hardware architectures of bi-cubic convolution interpolation termed Parallelized Row Column Interpolation Architecture (PRCIA) and Serialized Row Column Interpolation Architecture (SRCIA) for real-time image scaling. These architectures factor in the challenges of high computational complexity, redundant computations and repeated memory accesses, which were otherwise not explicitly...
Increasing the electric power demand and restrictions in the power system expansion due to the high cost and environmental issues urge the utility companies to deploy the devices which will increase the level of the power to be transmitted on the existing transmission lines. Unified Power Flow Controller (UPFC) is the most versatile Flexible AC Transmission System (FACTS) devices which can be used...
One of the main limitations in using high voltage and medium voltage DC grids is the issues related to the current-limiting devices and circuit breakers. These devices should be able to handle large currents in the normal operation condition and block high DC currents in a few microseconds in the case of DC faults. Moreover, they are required to dissipate huge amounts of energy stored in the transmission...
The first stage in the structure of a three-phase solid state transformer (SST) is a medium voltage active rectifier. Due to its relatively high voltage operating conditions, this rectifier requires careful topology selection for empirical implementation. In this paper, different topologies of active rectifiers are studied as candidates for the first stage in SSTs. The selected topologies are narrowed...
Core region detection of handwritten cursive words is an important step towards their automatic recognition. Several preprocessing operations such as height normalization, slant estimation etc. Are often based on this core region. This is particularly useful for word recognition of major Indian scripts, which have large character sets. The main parts of majority of these characters belong to the core...
A new pitch detection scheme has been proposed based on the short-time autocorrelation function (ACF) and average magnitude difference function (AMDF). The performance of the proposed scheme has been evaluated, through simulation, in a complete speech analysis-synthesis system. For detection of pitch, local maxima of ACF and local minima of AMDF values are computed. To reduce computational complexity,...
A voltage-source converter-based static synchronous compensator (STATCOM) is used in transmission and distribution systems for the purpose of voltage regulation and reactive power compensation. In the transmission level, angle-controlled STATCOMs are of primary interest due to their high efficiency and excellent waveform quality. There is a considerable number of angle-controlled STATCOMs installed...
A 1 cm × 1 cm 4H-SiC N-IGBT exhibited a blocking voltage of 20.7 kV with a leakage current of 140 µA, which represents the highest blocking voltage reported from an MOS semiconductor power switching device to date. The device showed a VF of 6.4 V at an IC of 20 A, and a differential Ron,sp of 28 mΩ-cm2. Temperature insensitive on-state characteristics were demonstrated. Switching measurements with...
A methodology to predict the process e-test parameters corresponding to each die (even in regions of the die where e-test structures are not available) from die test measurements for analog/RF systems is developed. The methodology provides diagnosis of process variations with higher spatial resolution in volume manufacturing over other techniques due to the availability of manufacturing test data...
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