大功率变频器的拓朴结构及其谐波抑制技术

本文对目前大功率变频器的主流拓扑结构及网侧输入电流和逆变器输出电流的谐波抑制技术进行了分析和介绍。     

浅谈矩阵变换技术在电梯应用中的难点

本文主要介绍了在电梯中应用一种新型的交-交变频技术-矩阵变频技术，它可实现电梯的能量回馈，既降低了产品的成本又节约了能源，并对应用中的难点作出分析，总结一些应用的经验和心得。     

高压大功率变频器在油田注水站的应用

本文通过对胜利油田注水站应用高压大功率变频调速节能技术的原理及效果分析，揭示了油田注水系统应用变频实施节能改造的巨大潜力。     

Ultrasensitive low power-consuming strain sensor based on complementary inverter composed of organic p- and n-channels

The use of low-strain sensors based on complementary inverters for the detection of tensile strain has been verified. Complementary inverter-type gauge circuits are comprised of a strain-sensitive bendable C₂₆H₁₆N₂(heptazole)-based organic field-effect transistor (OFET) and a relatively strain-insensitive N,N′-ditridecyl-perylene-3,4:9,10-tetracarboxylic diimide−C13(PTCDI-C13)-based one, as p- and n-channels, respectively. This study complementary circuit showed a voltage gain of more than 10 and a relatively low static current (below 0.2 nA) at a supplied voltage of 5 V, without strain application. Using the elastic and reversible response to the tensile strain in the heptazole p-channel, the complementary inverter-type gauge circuit enabled us to achieve a high gauge factor of 90% and to measure an extremely low strain level of 0.02% under subnanowatt power dissipation conditions during the strain-sensing operation. This ultrasensitive and low power-consuming strain gauge could be highly beneficial for portable and large-area strain sensors, one of the most critical components of mobile applications.     

正弦波输出的单相逆变电源设计

逆变电源是将直流电能转变成交流电能的变流装置,是太阳能、风力等新能源发电系统中的重要设备.本文主要介绍了正弦波逆变电源的主电路设计、单片机数字控制系统设计等内容.主电路包含单相全桥逆变电路、升压变压器和LC滤波电路等,数字控制选用dsPIC30F2010 PIC单片机产生SPWM波形,经IR2110芯片驱动MOS管,再经全桥逆变和LC低通滤波电路,最终输出正弦波交流电压.依据设计方案制作了实验样机,实验结果证实样机能输出纯净的正弦波电压,能够满足设计指标要求.     

重复控制在IGBT逆变电源中的应用

为了有效解决由非线性负载和死区等因素引起的输出波形畸变问题,提高稳态控制精度,研究并实现了基于重复控制算法的单相逆变电源。研究工作主要集中在建立单相逆变电源的数学模型和状态方程;分析重复控制器的基础理论和稳定性,详细讨论周期延时环节、超前环节、补偿环节的陷波器、二阶低通滤波器等各组成部分的设计方案,总结出工程实用的重复控制器设计步骤;利用MATLAB/Simulink进行建模和仿真分析;对控制系统的核心算法使用基于模型的设计方法,直接生成C代码;最终在3KVA的单相IGBT逆变电源实验样机上进行算法验证。实验结果表明该方案的有效性和可行性。     

MISO current mode bi-quadratic filter employing high performance inverting second generation current conveyor circuit

This paper presents static and dynamic studies of a new CMOS realization for the inverting second generation current conveyor circuit (ICCII). The proposed design offers enhanced functionalities compared to ICCII circuits previously presented in the literature. It is characterized by a rail to rail dynamic range with high accuracy, a low parasitic resistor at terminal X (1.6 Ω) and low power consumption (0.31 mW) with wide current mode (3.32 GHz) and voltage mode (3.9 GHz) bandwidths.Furthermore, a new MISO current mode bi-quadratic filter based on using ICCII circuits as active elements is proposed. This filter can realize all standard filter responses without changing the circuit topology. It is characterized by active and passive sensitivities less than unity and an adjustment independently between pole frequency and quality factor. The operating frequency limit of this filter is about 0.8 GHz with 0.674 mW power consumption.The proposed current conveyor circuits and bi-quadratic filter are tested by TSPICE using CMOS 0.18 µm TSMC technology with ±0.8 V supply voltage to verify the theoretical results.     

超级电容城市轨道列车能量管理系统研究

结合超级电容特性与城市轨道交通列车以其站间距离短频繁加速、启动、制动高负荷大功率运行的特点,给出超级电容等效电路及SOC测量方法,提出超级电容城市轨道列车能量管理方法。利用DC/DC逆变器buck模式与boost模式转换实现车辆总线电压在加速、制动时趋于稳定,能量转移控制过程加入系统通讯故障自处理部分,消弱了高压强电磁环境干扰影响。     

变频器在高层民用建筑给水泵房中的应用

随着城市用地的紧张,小区高层建筑越来越多,高层建筑的给水设计就愈加显得重要。给水一旦失去控制,必然给居民的生活和工作带来很大的麻烦,甚至造成财产损失。因此,必须严格按照国家规范规程做好民用建筑给水泵房的供电及电气控制设计工作。