Current Issue : April - June Volume : 2016 Issue Number : 2 Articles : 7 Articles
Transformerless photovoltaic (PV) power system is very promising due to its low cost, small size, and high efficiency. One of its most\nimportant issues is how to prevent the common mode leakage current. In order to solve the problem, a new inverter is proposed in\nthis paper.The system common mode model is established, and the four operation modes of the inverter are analyzed. It reveals that\nthe common mode voltage can be kept constant, and consequently the leakage current can be suppressed. Finally, the experimental\ntests are conducted.The experimental results verify the effectiveness of the proposed solution....
This study intends to fabricate a small-size capacitive wireless transmission device. As to the design of electrode plates,\nthe active electrode is designed in two ways, through row array and column array, and the area of an electrode plate is\nlimited to below 20.25 cm2. Moreover, the passive electrode of row-array electrode plates is designed in three ways: general\nrow array, window array, and rhombus array. As seen from the results of circuit simulation, the transmission efficiency\nof the capacitive wireless transmission device is as high as 0.7. In the actual circuit experiment, the electrode plate\nin the window-array design has the highest efficiency at 51%. In addition, the electrode plates in the window array and\nthose in other arrays have higher stability and transmission efficiency. In the rotational angle dislocation experiment, the\nunit area current amount of the column-array electrode plates in the high coupling region is also smaller than that of the\nwindow-array electrode plates. However, the performance of column-array electrode plates reaches higher stability in\nthe angle dislocation experiment, and its anti-angle dislocation is obviously higher than that of the electrode plates\ndesigned in the other three row arrays. Moreover, when the area of the column-array electrode plates is 22.25 cm2, the\nhighest transmission distance is 22.5 mm....
Imbalanced supercapacitor was constructed by using various ratio of activated carbon (AC) of positive to negative electrode. The\nelectrochemical behavior of imbalanced supercapacitor was investigated using 1.0Mspiro-(1,1')-bipyrrolidinium tetrafluoroborate\nelectrolyte in propylene carbonate. The results showed that there are some factors that influenced the imbalanced supercapacitor\nwith different AC ratio of positive to negative electrode, the utilization of AC, electrode potential distribution, and life cycle.The\nimbalanced supercapacitor with an AC weight ratio of 80 : 120 of positive to negative electrode has an average potential distribution\nin each electrode, and it revealed the best electrochemical performance: specific capacitor was 39.6 Fââ?¹â?¦gâË?â??1,while the charge-discharge\nefficiency was 97.2% after 2000 life cycle tests....
Maximally flat low pass microstrip filter was designed and simulated in this research. The filter was designed at 1 GHz and its lumped parameter model was simulated in ansoft designer SV. The same filter was designed using microstrip technology taking substrate which was having dielectric constant 2.2. The microstrip line model was simulated in Ansoft designer SV and HFSS. The simulated results were compared and it showed good agreement between them....
For several years now, electric vehicles (EVs) have been expected to become widely available in\nthe micro-mobility field. However, the insufficiency of such vehicles� battery-charging and discharging\nperformance has limited their practical use. A hybrid energy storage system, which\ncomprises a capacitor and battery, is a promising solution to this problem; however, to apply\nmodel-based designs, which are indispensable to embedded systems, such as the electronic control\nunits used in EVs, a simple and accurate capacitor model is required. Within this framework, a\nlithium-ion capacitor (LIC) model is proposed, and its charging and discharging performances are\nevaluated against an actual LIC. The model corresponds accurately to the actual LIC, and the results\nindicate that the proposed LIC model will work well when used with Model-Based Design\n(MBD)....
A new scalable unidirectional error detecting code is discussed. Operations used in Scalable Error Detection Code (SEDC) and key terms are defined. SEDC are then defined and encoding methods are explained. Finally, decoding and error detection method is discussed and an example is provided to clarify the encoding, decoding and error detection methods. It is proved that in the context of electronic circuits, SEDC is efficient in terms of area, latency and fault coverage....
Additive and low-temperature printing processes enable the integration of diverse electronic\ndevices, both power-supplying and power-consuming, on flexible substrates at low cost. Production\nof a complete electronic system from these devices, however, often requires power electronics to\nconvert between the various operating voltages of the devices. Passive componentsââ?¬â?inductors,\ncapacitors, and resistorsââ?¬â?perform functions such as filtering, short-term energy storage, and\nvoltage measurement, which are vital in power electronics and many other applications. In this\npaper, we present screen-printed inductors, capacitors, resistors and an RLC circuit on flexible plastic\nsubstrates, and report on the design process for minimization of inductor series resistance that\nenables their use in power electronics. Printed inductors and resistors are then incorporated into a\nstep-up voltage regulator circuit. Organic light-emitting diodes and a flexible lithium ion battery are\nfabricated and the voltage regulator is used to power the diodes from the battery, demonstrating\nthe potential of printed passive components to replace conventional surface-mount components in a\nDC-DC converter application....
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