Photo-patternable high-k ZrOx dielectrics prepared using zirconium acrylate for low-voltage-operating organic complementary inverters

Solution-processed dielectric materials with a high dielectric constant (k) have attracted considerable attention due to their potential applications in low-voltage-operating organic field-effect transistors (OFETs) for realizing large-area and low-power electronic devices. In terms of device commercialization, the patterning of each film component via a facile route is an important issue. In this study, we introduce a photo-patternable precursor, zirconium acrylate (ZrA), to fabricate photo-patterned high-k zirconium oxide (ZrO_x) dielectric layers with UV light. Solution-processed ZrA films were effectively micro-patterned with UV exposure and developing, and transitioned to ZrO_x through a sol-gel reaction during deep-UV annealing. The UV-assisted and ∼10 nm-thick ZrO_x dielectric films exhibited a high capacitance (917.13 nF/cm² at 1 KHz) and low leakage current density (10⁻⁷ A/cm² at 1.94 MV/cm). Those films could be utilized as gate dielectric layers of OFETs after surface modification with ultrathin cyclic olefin copolymer layers. Finally, we successfully fabricated organic complementary inverters exhibiting hysteresis-free operation and high voltage gains of over 42 at low voltages of ≤3 V.     

A New Approach to H-Infinity Control for Grid-Connected Inverters in Photovoltaic Generation Systems

Abstract

The present study investigates the stability problem of the grid-connected inverters (GCIs) for possible variations in grid impedance. A new type of H∞ control method is proposed for the current control loop of inverters, where the third weighting function is determined using the game theory. The proposed method is applied to the GCI in a photovoltaic system and its response to variations in grid impedance is investigated. Computer simulations conducted for comparison of H∞ and PI controller indicate the effectiveness of the proposed control algorithm. Simulation results also show that the proposed algorithm significantly outperforms the PI controller under the conditions of varying grid impedance.     

Defect-Engineered Atomically Thin MoS2 Homogeneous Electronics for Logic Inverters

Ultrathin molybdenum disulfide (MoS₂) presents ideal properties for building next-generation atomically thin circuitry. However, it is difficult to construct logic units of MoS₂ monolayer using traditional silicon-based doping schemes, such as atomic substitution and ion implantation, as they cause lattice disruption and doping instability. An accurate and feasible electronic structure modulation strategy from defect engineering is proposed to construct homogeneous electronics for MoS₂ monolayer logic inverters. By utilizing the energy-matched electron induction of the solution process, numerous pure and lattice-stable monosulfur vacancies (V_monos) are introduced to modulate the electronic structure of monolayer MoS₂ via a shallow trapping effect. The resulting modulation effectively reduces the electronic concentration of MoS₂ and improves the work function by 100 meV. Under modulation of V_monos, an atomically thin homogenous monolayer MoS₂ logic inverter with a voltage gain of 4 is successfully constructed. A brand-new and practical design route of defect modulation for 2D-based circuit development is provided.     

单相SPWM逆变电源的一种新型控制策略研究

深入研究了单相SPWM逆变电源的一种新型控制策略———重复控制,并在M atlab/S imu link软件环境下进行了仿真。仿真结果表明:该控制方法能够很好地抑制谐波,具有很好的鲁棒性。     

一种具有恒定能量回馈的吸收电路

本文给出一种具有恒定能量加馈的无源吸收电路,它适合高功率逆变器工作。     

印刷生产线的智能控制

本文介绍了薄膜印刷生产线的基本组成，用ＰＬＣ及变频器实施控制的基本原理，并介绍了有关控制方法。     

变频恒压供水PLC控制系统的设计

为实现恒压供水,采用可编程序控制器（PLC）为主控器,变频器为执行机构,完成变频恒压供水系统的硬件和软件的设计。实现管网压力的准确采集,自动调节某台水泵的转速和多台水泵的投入及退出,使管网主干管出口端的压力基本保持在一定的范围内。供水控制系统投入运行后,各项指标达到了设计要求,满足居民和工业用水的需要。     

智能节能控制型木业分锯机的研制

福建威驰机械制造有限公司研制开发第一代＂节能高效超薄分锯机＂,其采用双轴双锯系统,且不分材质情况均采用高速恒速切削,链输送电机采用恒速输送木料,当材质特硬时,特别是遇到结疤时,电机将出现堵转现象,这样既降低效率、增加损耗,又影响电机寿命,严重时烧毁电机。利用PLC、变频器等器件对系统进行更新设计,可实现根据材质的性质决定链输送电机的输送速度,提高效率,降低能耗,延长电机寿命,从而实现智能化控制,安全性能大大提高。     

基于LCL滤波器优化的微电网多逆变器稳定运行控制系统

为了有效控制逆变器谐振现象,保障逆变器稳定运行,设计基于LCL滤波器优化的微电网多逆变器稳定运行控制系统。依据LCL多逆变器拓扑结构,创建LCL滤波器三相微电网多逆变器的状态空间数学模型。依据该数学模型,分析滤波器的谐振特性,采用2个互相独立的单相逆变器实现对平衡三相LCL逆变器中谐振控制,利用单相LCL逆变器完成控制策略研究;利用被动阻尼策略,通过电容支路串、并联阻尼法对LCL滤波器的逆变器进行振荡控制优化;利用主动阻尼策略,在不添加其他传感器和控制闭环的条件下,运用2对零极点使闭环系统中全部的主导极点都在垂直平面单位圆中,抑制LCL滤波器谐振问题,以实现系统稳定运行控制优化。实验表明,该方法通过主动阻尼和被动阻尼控制策略对LCL滤波器进行优化,能够确保微电网多逆变器的母线电压以及暂态波形的稳定,控制效果好。