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This paper investigates significant changes in the performance of switch-mode power supplies used in standard desktop PCs (PC-SMPS'), which might occur when a PC-SMPS transfers from high to low operating powers. Using the experimental results, it is shown that due to a partial discharging of dc link capacitor at low powers, the input ac current of tested PC-SMPS' loses its periodicity with supply...
Modern power semiconductor devices have low capacitances and can therefore achieve very fast switching transients under hard-switching conditions. However, these transients are often limited by parasitic elements, especially by the source inductance and the parasitic capacitances of the power semiconductor. These limitations cannot be compensated by conventional gate drivers. To overcome this, a novel...
This paper investigates the soft switching performance of a 1.2 kV half-bridge SiC MOSFET module, FCA150XB120 from Sanrex. The selected module has both MOSFET and diode integrated on a single chip. A single pulse control circuit is employed in a half-bridge series resonant inverter topology with a split dc-link and an LC load in order to emulate a real inverter operation. This results in a square...
Despite the rapid development of dye-sensitized solar cell since its early breakthrough by Graetzel in 1991, further development on the design and fabrication technique still constitutes a major challenge for this type of solar cell to reach the mass production and marketing level. Generally, the upscaling of dye-sensitized solar cell for daily utilizations necessitates the interconnection of multiple...
The energy crisis in the future will be a threat for human life. Many advancements of technology currently focus on creating something that perform better than its predecessor but consuming less power. Light-emitting diode (LED) lighting technology has been introduced as a breakthrough of technology which possesses big advantages rather than other lighting technologies. LED lighting technology is...
This paper presents and discusses the performance evaluation, monitoring and analysis of a Heating, Ventilation and Air Conditioning (HVAC) system in a residence in Saudi Arabia. The installed air conditioning (A/C) system operates in extreme and severe weather conditions. The local area is characterized by a high level of ambient temperature, high irradiation, high humidity and frequent dust storms...
Galvanic manufacture is very energy-intensive process. Therefore, even a small gain in efficiency can contribute to significant energy savings. The quality of the coating greatly depends on the power supply. This paper presents the results of developing and experimental tests of DC/DC converter prototype for electroplating installation. Proper preparation of the winding stack allows to lower losses...
For drive train efficiency optimization, an accurate but simple loss model of an interior permanent magnet synchronous machine (IPMSM) is proposed. In order to analyze different inverter topologies, switching frequencies and modulation techniques it is necessary that the loss model of the machine takes losses caused by harmonics into account. Considering harmonics and saturation effects, loss characteristics...
The charge pumps are used in many areas of electronic industry for generating higher (or negative) voltage than a power supply. Our article is focused on the development Dickson charge pump in discrete form. This charge pump was designed and realized on PCB. The key parameters were measured and verified with the parameters from simulation after fitting models of the used electronic components.
A Ka-band power amplifier (PA) in a differential cascode topology with active biasing is designed, implemented in a 0.25 μm SiGe BiCMOS technology, and characterized. The design presents low power consumption and high Power Added Efficiency (PAE). This PA presents an output power of 12.3 dBm at P1dB with 16.5% Power Added Efficiency (PAE). The PAE peak is 17.5 % and it is centered nearby the P1dB...
This paper presents the results of research into the application of an active battery switching system in the drivetrain of a prototype electric vehicle. The system's purpose is to increase the drivetrain's electrical efficiency especially in the partial-load range. Efficiency is increased using a switching unit that allows the vehicle's traction-battery circuitry to be changed during operation and...
In conventional data envelopment analysis (DEA) models, the efficiency scores of decision making units (DMUs) are usually evaluated in a special period of time where desirable and precise measures exist. Nevertheless, there are situations in the real world that the efficiency of systems should be evaluated in multiple periods of time when undesirable and imprecise measures present. To address this...
This paper investigates the operation of a bi-directional interleaved converter. The DC-DC converter can operate both as a buck and a boost converter as per operating requirements. Design methodology for the converter operating in either modes is presented in detail. Analysis on duty cycle limits, voltage conversion ratios and efficiency including non-idealities of the converter is presented. Extensive...
Alternating current inorganic powder electroluminescent (IPEL) devices possess many advantages including wide viewing angle, wide operating temperature range, and easily manufactured by using a screen printing process. This study developed an IPEL devices with low power consumption and high brightness on a transparent polyethylene terephthalate substrate by introducing a composite dielectric layer,...
Despite the consistent advances in visual features and other Content-Based Image Retrieval techniques, measuring the similarity among images is still a challenging task for effective image retrieval. In this scenario, similarity learning approaches capable of improving the effectiveness of retrieval in an unsupervised way are indispensable. A novel method, called Cartesian Product of Ranking References...
This paper presents an efficient and accurate method flow in USB2.0 high speed buffer tuning. The paper seeks to tackle the issue of lengthy development (pre- & post-silicon design) cycle on determining correct and optimized Analogue Front-End (AFE) buffer register settings for the extensive variation of topologies and wide electrical loss profile channels of USB2.0. A current process flow typically...
A wide range of modern low voltage power electronic (PE) devices feature sophisticated controls, which aim to improve device performance and ensure better regulation of grid-side ac currents. The implementation of these controls is expected to result in increased device efficiency, improved controllability, higher operating power factors and reduced harmonic emissions. The interactions of individual...
This paper presents a highly configurable DC/DC power supply fed by the popular USB port. It features buck and boost behavior with variable output voltage together with high efficiency by usage of the ZETA-topology. Furthermore smart power supply functions are implemented to control and monitor output values with a graphical user interface.
The paper presents an economic study concerning the replacement of HV/MV power transformers (TRs) according to the requirements recently introduced in the Commission Regulation EU n°548/2014 (Tier I and Tier II class transformers). Two case studies based on measured yearly load profiles of existing TRs, referring to two primary substations in a MV distribution network, have been carried out. A Monte...
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