In recent years, interest in natural energy has grown response to increased concern for the environment. Many kinds of inverter circuits and their control schemes photovoltaic (PV) power generation systems have been studied. A conventional system employs a PV array which many modules are connected series obtain sufficient dc input voltage generating ac utility line from an circuit. However, total generated is sometimes decreased remarkably when only few partially covered by shadows, thereby...

This paper focuses on a shunt active filter based the detection of harmonic voltages at point installation. The objective is to attenuate propagation resulting from series/parallel resonance between capacitors for power factor correction and line inductors in distribution line. acts as low resistor external circuit frequencies, it installed end bus line, just like 50 /spl Omega/ terminator terminal signal transmission Therefore, function referred "harmonic termination" this paper....

A general-purpose clocked gate driver integrated circuit (IC) to generate an arbitrary waveform is proposed provide a universal platform for fine-grained optimization handling various power transistors. The fabricated IC with 0.18 μm Bipolar-CMOS-DMOS process has 63 P-type MOS (PMOS) and N-type (NMOS) transistors on chip whose activation patterns are controlled by 6-bit digital signals 40 ns time step control. In the 500 V switching measurements manual optimization, reduces overshoot 25%...

This paper deals with a curious phenomenon referred to as the "whack-a-mole" that may occur in long-distance distribution feeder having many capacitors for power-factor correction. The idea of whack-a-mole is installation an active or passive filter on makes voltage harmonics increase some buses, whereas it decrease other especially at point installation. distributed-parameter representation applied simplified feeder, thus making possible perform analysis whack-a-mole. As result, this yields...

In recent years, interest in natural energy has grown because of increased environmental concerns. Many kinds inverter circuits and their control schemes for photovoltaic (PV) power generation systems have been studied. a conventional system, the PV array which many modules are connected series is used to obtain sufficient DC-bus voltage generating an AC utility line from circuit. However, total sometimes decreased remarkably when few partially covered by shadows, thereby decreasing its...

The reaction of La 1‐ x Ca MnO 3 ( = 0, 0.1, 0.2) with ZrO 2 ‐8 mol% Y O (YSZ) has been investigated at temperatures ranging from 1300° to 1425°C in air. Substitution for LaMnO depresses the reactivity YSZ. A layer Zr 7 is formed /YSZ interface after an induction period, and its formation accelerated when phase porous. proceeds by unidirectional diffusion La, Mn, and/or ions, mainly Mn into coefficients ions YSZ, which are estimated using a /single‐crystal YSZ couple, much lower than that...

This paper addresses a transformerless shunt hybrid filter integrated into three-phase diode rectifier. The consists of passive tuned to the seventh-harmonic frequency, and small-rated active based on voltage-source pulsewidth modulation converter. validity system design is confirmed by experimental results obtained from 400-V, 15-kW laboratory system. show that plays an essential role in reducing supply harmonic currents. total distortion current gets less than 5%. Moreover, provides...

This paper presents a single-phase grid connected inverter with power decoupling circuit. In the inverter, it is well known that pulsation twice frequency contained in input power. conventional electrolytic capacitors large capacitance have been used order to smooth DC voltage. However, lifetime of those shortened by frequency. The authors studied active method reduce pulsating on bus line, this enables transfer ripple energy appeared into small film capacitor additional Hence, extension can...

Two types of 4H-silicon carbide (SiC) MOSFETs are proposed in this paper. One is the novel designed V-groove trench MOSFET that utilizes 4H-SiC (0-33-8) face for channel region. The MOS interface using shows extremely low state density (Dit) 3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> eV xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> , which causes high mobility 80 V...

The requirements for peripheral circuits of power converters are becoming more restrictive due to the enhancement Si-based devices and practical use SiC device. In design modern high-speed switching converters, stray inductances capacitances both in device package gate drive circuit addition those main converter must be considered. these situations, driving technique represents key technology ability devices, as there limitations reduce capacitances. So far, several active control methods...

We present a new device called common-mode impedance stabilizing (CMISD), which is applied to the output of inverters installed in railroad vehicles. The proposed used evaluation disturbance voltage conductive emissions; its purpose stabilize (CM) (150 ± 20 Ω) 100 kHz ‒ 10 MHz frequency range, corresponds operating frequencies signaling devices "balises." balises are on tracks and for communication between trains wayside systems, electromagnetic compatibility rolling stock severe problem. In...

Abstract To enhance isolation in gate-drive circuits for multilevel inverters, we proposed transversal piezoelectric boundary acoustic wave (PBAW) filters to replace previously used surface filters. First, investigated PBAW simple and easy-to-fabricate SiO 2 /Au/LiNbO 3 structure. Calculations demonstrated that reducing number of electrode pairs enhances propagation characteristics; however, this structure does not effectively mitigate signal degradation. Therefore, /Ta O 5 structure,...

Due to the advance of information technologies, a large number electronic products such as personal computers have been connected power distribution systems in commercial buildings. Hence, voltage distortion on utility outlets and excessive neutral current lines arisen lead serious problems system. Two control methods related compensation characteristics series active filter conductor are presented this paper. The distinct functions proposed mitigation third-harmonic three-phase four-wire...

Field studies were conducted on the growth, breeding cycle and recruitment of two ocypodid crabs Scopimera globosa De Haan Ilyoplax pusillus Haan, in estuary ofWaka River (34°l0'N 135°10'E).The sexual behaviors observed from April through August S. May I. pusillus.The ovigerous females found those September, being most abundant June both species.The newly settled juveniles species, showing occurrence intensive settlement July to August.The sites almost coincided with adult habitat species.In...

Recently, with research and development of SiC power devices, 1.2 kV MOSFETs have become commercially available. The parasitic parameters, such as output capacitance, in each device are not identical, because they depend on the structure material properties. Therefore, voltage sharing turn-off operations under series-connection conditions devices may be affected. This paper proposes a balancing method for series-connected using digital control circuits. To compensate unbalance conditions,...

Recently, high-speed switching circuits using SiC and GaN power devices have been developed for next-generation electronics applied to actual traction systems in Japan. Stray inductance caused by the wiring structures between dc capacitors is one of most critical parameters that influences circuits. This paper presents a design procedure acceptable stray based on scaling method. It should be noted designed not minimization but optimization, also shown as an absolute value [H] percentage [%]....

A gate driving for power devices is a key technology to further improve switching characteristics. With the help of digital driver IC, behavior can be enhanced even under high-speed switching. In this paper, an evaluation platform determining optimal pattern active drive control proposed inverter circuit. high speed optimization system built up search advantageous that reduces total loss two in circuit and constrains surge voltage simultaneously. The online demonstrates its feasibility...

Abstract We propose a Y configuration power router as unit cell to easily construct delivery system that can meet many types of user requirements. The controls the direction and magnitude flows between three ports regardless DC or AC. constructed prototype three‐way isolated DC/DC converter is core router. electrical insulation assures safety reliability for network systems. then tested operation flow control. experimental results revealed our methodology based on governing equation was...

Some species of the genus Metaplax belonging to family Grapsidae have occasionally been reported perform waving display that is a characteristic behavior in Ocypodidae but uncommon grapsids. The morphology and life styles are also quite similar those ocypodid Macrophthalmus. To examine whether ecological morphological similarities between Macrophthalmus based on convergent evolution or their common evolutionary history, 841-bp nucleotide sequences from 16S mitochondrial ribosomal RNA gene 19...