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Based on the change of the productive and energetic matrix of Ecuador, that consist in the substitution of liquid gas coming from black oil for electricity to cook food and water heating for human use in residential areas, a prototype Toroidal Coil (TC) for a water heater Magnetic Induction (MI) is presented in this article.
Electric vehicles are an efficient alternative to gasoline-fuelled vehicles, but suffer from limited cruising range and long battery charging time. Wireless power transfer is among the solutions for these problems. By using it, the control of the power converters is essential for achieving high efficiency and desired power to the load at any time. Simultaneous regulation of both power and efficiency...
The aim of this work is to improve the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) using composite films consisting of titanium oxide (TiO2) nanoparticles and multiwalled carbon nanotubes (MWCNTs). A transmission electron microscope (TEM) was used to confirm the dispersion of carbon nanotubes (CNTs) in TiO2. Composite photoanode-based solar cells were characterized by UV–Visible...
When a DC voltage source supplies energy to an electric load, it can operate either for maximum power transfer and low efficiency (50%), or with an acceptable efficiency with less power transferred. In this paper an analytic expression is developed and used to quantify this trade off. Moreover, this expression is validated by an experimental circuit demonstrator.
Dynamic data structures in software applications have been shown to have a large impact on system performance. In this paper, we explore energy saving opportunities of interface-based dynamic data structures. Our results suggest that opportunities do exist in the C5 Collection, at least 16.95% and up to 97.50%. We propose an architecture for building adaptive green data structures by applying machine...
This paper introduces the power-density and temperature induced issues in the modern on-chip systems. In particular, the emerging Dark Silicon problem is discussed along with critical research challenges. Afterwards, an overview of key research efforts and concepts is presented that leverage dark silicon for performance and reliability optimization. In case temperature constraints are violated, an...
This paper aims to improve the problems of the power of cloud computing servers used in data centers. First, we analyze the problem of power consumption of server in the cloud data center and extract the important power parameters. The second, we propose a new DC power sharing server architecture for solving the problem. Then we propose the server level DC power sharing scheme and extended to the...
For over a century, since the invention of the telephone, the telephone network has relied on DC Power and has used DC battery reserve to provide “continuous dial tone”, even during commercial power outages. The debate between proponents of George Westinghouse's AC and Thomas Edison's DC commercial power distribution schemes has raged just about as long as the telephone has existed. The debate over...
In the field of wireless power transfer technologies, the improvement of transmission efficiency is one of the critical issues. It is important to understand how much power loss is imposed in which areas of a wireless power transfer system in the development phase. Since the transmission characteristics change according to ambient conditions, a measuring instrument capable of observing electric power...
This paper analyzes and designs inductive coupling power delivery (ICPD) system for 3-D stacked chips in SMIC 65-nm CMOS process. Two shapes of inductors, the rectangular and the octagonal inductor, are compared. Fully customized octagonal inductors with 500 μm diameter are optimized to improve power delivery efficiency. An octagonal inductor based ICPD consisting transmitter and receiver circuit...
This paper presents CMOS VCO circuit, as a part of Automatic Dependent Surveillance-Broadcast (ADS-B) transmitter, operating at 978 MHz, delivers highest output power with highest efficiency ever reported to the best of authors' knowledge. The 0.738 mm × 0.606 mm VCO chip fabricated using 0.18 um CMOS technology, exhibits the differential peak output power of 2.54 dBm at 1 GHz, with the frequency...
In the field of wireless power transfer technologies, the improvement of transmission efficiency is one of the critical issues. It is important to understand how much power loss is imposed in which areas of a wireless power transfer system in the development phase. Since the transmission characteristics change according to ambient conditions, a measuring instrument capable of observing electric power...
Optimizing the power-performance tradeoff of a software system is challenging as the design space is large and live data is difficult to obtain. As a result, many power reduction techniques are based on power models which may not represent the full complexity of the system being analyzed. In this paper, in contrast, we propose a process for performing a tradeoff analysis using live power/performance...
This paper focuses on wireless transfer power system based on Witricity technology, for resonant magnetic coupling and overviews the modeling of the coreless transformer used in the wireless system. An outline of a practical method is developed to calculate the system characteristic. An iterative process is carried out in order to find the parameter that optimizes the efficiency while minimizing the...
The performances and the results of the qualification plan of the new high power GaN HEMT process GH25-10 are summarized in this paper. This technology would be the first ¼ gate length process qualified in Europe on 4” SiC substrate and will be fully open in foundry mode mid of 2014. It addresses applications up to 20 GHz with state of the art figure of merits in term of power density, gain, efficiency...
In this paper, we propose a control strategy for a wind turbine that employs a hydrostatic transmission system for transmitting power from the wind turbine rotor via hydraulic transmission line to a ground level generator. Wind turbine power curve tracking is achieved by controlling the hydraulic pump volumetric displacement and, at the other end of the hydraulic line, the hydraulic motor volumetric...
In this paper, a linear model for intrinsic power and efficiency in Radio-Frequency Switched-Capacitor Power Amplifiers (SCPA) is presented. Given a target output power and frequency of operation this model enables sizing the output stage inverter for maximum efficiency by means of back-of-the-envelope equations. The model is validated by SpectreRF simulations for a low-power CMOS 28nm technology...
The paper discuses an important construction aspects of resonant wireless power transfer (WPT) system for small portable devices. It focuses mainly on key electrical parameters of the systems resonant linkage and its proper construction shape. All presented theoretical presumptions are consequently verified by detailed measurement.
This paper presents a highly efficient power-redundant system for rack mount servers by changing the power backplane of the server main board. The proposed system does not need an additional redundant power supply for supporting power redundancy by sharing power at each rack mount server. In addition, the proposed power sharing architecture can provide more power efficiency than the existing rack...
From the electron motion equations and Maxwell equations, the coaxial gyrotron beam -wave coupling equations are derived and the coaxial gyrotron self-consistent theory of large-signal model is established. Using codes MATLAB, A set of codes is developed and the 170GHz, 1.7MW coaxial gyrotron beam- wave interaction is simulated. Based on self-consistent theory, the field profile, phase and efficiency...
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