MXenes have been demonstrated as a potential candidate in the field of photovoltaics and energy storage owing to their high transmittance, metallic conductivity tunable work function.

In existing research on cluster head selection schemes in the Internet of Vehicles (IoV), designing a stable structure poses significant challenge. Choosing centrally-located that can respond rapidly is crucial for meeting various requirements. To address aforementioned challenges, this paper introduces machine learning-based IoV scheme (HSCS). We introduce new metric termed N-cycle Average Virtual Cluster Delay (XTn) appropriate selection. accommodate high dynamism vehicles, learning model...

Reduced power processing is a new trend to improve the conversion efficiency of light-emitting diode (LED) driver systems. Based on concept, LED architecture proposed in this article, which requires fewer semiconductors compared with prior works, leading potential lower cost and higher efficiency. A ac/dc topology derived accordingly based achieve constant output current unity factor significant energy storage reduction 100-/120-Hz buffer. Through split shared inductor, required magnetic...

Recent developments of fast-charging power delivery protocols are driving ac–dc adapters to 100-W ranges. Conventional solutions in this range employing a two-stage topology and big twice-line frequency buffer capacitor generally costly bulky. This article presents patent-pending modulation method for an active-clamp flyback converter, allowing single-stage adapter design with reduced capacitance requirements higher efficiency. is achieved by exploiting the inherent energy storage capability...

To mitigate the bulky and heavy twice-line frequency power buffer in single-phase power-factor-correction (PFC) rectifiers while maintaining a lower cost, active-power-decoupling integrated active clamp flyback (iACF) PFC rectifier is recently proposed literature. The solution inherits all benefits of conventional ACF converters such as low component count, leakage energy recycling, soft-switching being able to reduce size system without hardware modifications. However, existing modulation...

As a technology that makes power transfer more flexible, wireless (WPT) has become hot research topic in recent years. However, most of the existing studies are based on DC–DC WPT system. If applied to AC loads, traditional system usually contains multiple energy conversion stages, which lead low transmission efficiency and therefore higher costs. Besides, necessary large electrolytic capacitors make unreliable bulky. The goal this study is design reliable efficient featuring constant...

Conventional two-stage power factor correction (PFC) architecture based on a boost PFC front end and an isolated dc–dc back is increasingly challenged by the recent trend toward higher density efficiency. One key reason for challenge difficulty of increasing operating frequency stage. This article presents new star that allows stage to operate efficiently at while maintaining performance second stage, leading high-power-density high-efficiency ac–dc converter design across universal input....

Light‐emitting‐diode (LED) drivers are required to maintain the power quality of both AC input and DC output side. The regulation prevents adverse impacts on grid maintains nominal operating condition LEDs. Without significant filtering, from a single‐phase source can result in low‐frequency flickers that raise health issues. This study proposes LED driver topology achieve low harmonics at side flicker‐free operation drive A novel ripple‐cancelling scheme is developed minimise redundant...

Deep trench junction termination employing variable-K (VK) dielectric for high voltage devices is proposed and studied. The device features 3 layers trench. bottom of the low-K (LK2), which used to sustain most reverse bias voltage. top high-K (HK), forces electric displacement lines via HK in instead silicon drift layer. middle layer also (LK1), transmits part LK2. A new field (E-field) peak introduced region next interface between LK1 LK2 results a more uniform E-field, compared with...

An appearance defect online inspection system of mesh fabric has been developed based on machine vision. The mean filter method is adopted to eliminate noise. adaptive threshold brightness presented the effects uneven illumination and separate foreground background. By analyzing texture characteristics features fabric, identification proposed. results have shown when speed reaches 60m/min, recognition rate can reach 95% or more meet automation requirements enterprises quite well.

Two-stage power factor correction (PFC) architecture, consisting of a boost PFC front end and an isolated dc–dc converter, is widely used in ac–dc applications. However, the loses zero-voltage-switching (ZVS) under high-line conditions, limiting its practical switching frequency. Consequently, relatively large inductor electromagnetic interference (EMI) filters are needed two-stage leading to lower density design. This article proposes stacked-switch architecture that allows all switches...

Critical conduction mode (CRM) boost power factor correction (PFC) front end is one of the most popular solutions to universal ac–dc applications below 300 W for its simplicity and high efficiency. However, density largely limited by need a relatively bulky inductor buffer capacitor. This article introduces new PFC that enables simultaneous size reduction both capacitor achieving zero-voltage-switching all switches active buffering. A 100-W input prototype built, measuring 96.7% peak...

In this paper, we investigate how to apply the nonorthogonal multiple access (NOMA) technique into UAVassisted relay networks, and optimize system parameters further improve network performance. Specifically, incorporate NOMA with decode-and-forward (DF) protocol, where destinations can receive signals of source simultaneously via NOMA. Theoretical analysis demonstrates that proposed NOMA-DF-relay protocol is superior traditional orthogonal (OMA) based DF-relay in terms data rate. To fully...

In the analysis of power system small signal stability, state-space equation which is based on comprehensive consideration synchronous generator, automatic excitation system, prime mover and its speed control stabilizer, often high dimension. This makes it difficult for researchers to analyze all state variables in dynamic process. The modal perturbation theory employed present study can not only reduce order original model computational efforts but also obtain changes variables. Afterwards,...

Accurate accommodation evaluation is important for the development planning of wind power. However, it difficult to obtain detailed time-sequence data power output during stage and typical method be applied, so necessary research capacity based on limited resource probabilistic; characteristic data. This paper proposed a functional minimization model which took maximum as target probability production simulation practical algorithm heuristic; method. only needed distribution information...

Light-emitting diodes (LED) are regarded as the ideal replacement for traditional lighting sources. With increasing utilization, accumulating power capacity brings input quality into concern. A LED driver is required to maintain good minimal impact on grid. Single-stage an effective solution low-cost and low-power application. SIN SIN^2 current references recently proposed single-stage driver. In this paper, a novel reference based electric model of further improve compared with references....

Abstract In recent years, the basic business of power distribution production, such as automation, consumption information collection and load control, distributed supply so on, is growing rapidly, demand for terminal communication access increasing. Based on analysis research technology, this paper proposes a heterogeneous network combination scheme which integrates multiple technologies to solve problems limitation existing technology side. Heterogeneous networking realizes integration...

2T-2MTJ STT-MRAM suffers from the intrinsic stochastic switching behaviors of MTJ, “source degeneration” and leakage current problem its access transistors, which could cause erroneous operations including write error hold error. To mitigate those operations, Dynamic Voltage Threshold based High NMOS (HVT-nDTMOS) is used as transistors to increase writing reducing current. Simulation results show that optimized design reduces rate by about 13.3% 0.062‰ reduction in for each memory cell on...

Compared to the conventional active clamp flyback (ACF) converter, power decoupling integrated ACF (iACF) converter has recently been proposed due its capabilities of simultaneous realization output voltage regulation, input current shaping, as well buffer capacitor reduction. This article aims make a comparative study different control strategies for iACF regarding efficiency, total harmonics distortion (THD), complexity, and dynamic responses aspects. The operating principles are first...

State-of-the-art bridgeless power factor correction (PFC) rectifiers commonly face challenges, such as hard-switching losses in continuous conduction mode (CCM) and high magnetic critical (CRM) or other soft-switched modes. These limitations restrict the efficiency density of these use for USB-PD applications. This article presents a novel two-stage converter that achieves soft-switching CCM front-end PFC rectifier while maintaining advantageous features second-stage DC-DC converter....

With the improvement of capacity largescale wind power grid and single turbine, problem perturbation stability in is getting more significant. A mathematical model has been deduced from dynamic characteristics which can be used analysis doubly-fed units, including shafting model, pitch angle machine model. The proposed Model Equivalents Method based on optimal linear combination theory, reduce original order system. This method also demonstrate accuracy equivalent according to goodness fit...