High power devices in wide bandgap semiconductors

Silicon carbide (SiC) semiconductor devices for high power applications are now commercially available as discrete devices. Recently Schottky diodes are offered by both USA and Europe based companies. Active switching devices such as bipolar junction transistors (BJTs), field effect transistors (JFETs and MOSFETs) are now reaching the market. The interest is rapidly growing for these devices in high power and high temperature applications. The main advantages of wide bandgap semiconductors are their very hi...     

一种新型板载式IGBT驱动器设计

设计了一个基于2SC0108T的新型板载式IGBT驱动器.该驱动器具有直接模式和半桥模式、工作模式可选、驱动信号硬件互锁、硬件死区时间可调、IGBT过流及直通短路保护、驱动电源过欠压监控、IGBT模块温度监测和易于安装的特点.设计了相应的前级驱动电路、后级功率驱动电路、温度调理电路和故障报警电路等,进行了相关参数的计算...     

Multi-objective voltage and frequency regulation in autonomous microgrids using Pareto-based Big Bang-Big Crunch algorithm

Voltage and frequency regulation is one of the most vital issues in autonomous microgrids to ensure an acceptable electric power quality supply to customers. In this paper, a real-time control structure including power, voltage, and current control loops is proposed for microgrid inverters to restore voltage and frequency of the system after the initiation and load changes. The Proportional-Integral (PI) gains of the voltage controller are optimized in a real-time basis after a perturbation in the microgrid to have a fast and smooth response and a more stable system. The current controller produces Space Vector Pulse Width Modulation command signals to be fed into the three-leg inverter. The multi-objective optimization problem has objective functions of voltage overshoot/undershoot, rise time, settling time, and Integral Time Absolute Error (ITAE). The modified Multi-Objective Hybrid Big Bang-Bing Crunch (MOHBB-BC) algorithm is employed as one of efficient evolutionary algorithms in order to solve the optimization problem. The MOHBB-BC method obtains a set of Pareto optimal solutions; a fuzzy decision maker is used to pick up the most preferred Pareto solution as the final solution of the problem. Results from testing the control strategy on a case study are discussed and compared with previous works; according to them, the proposed method is able to obtain dynamic PI regulator gains to have a more appropriate response.     

两种工作电源的设计与实现

给出了直流稳压电源和逆变电源的设计方案。直流稳压电源具有两路±1 5 V,两路±1 2 V,两路±5 V和一路1.25～37V连续可调七路输出,每路输出电流最大可达1.5A;逆变电源输出功率可达250VA。经测试,这两种电源输出精确,稳定性好,是一种理想的实验室或家用电源。     

基于PLC变频控制系统在反渗透海水淡化装置中的应用

介绍了以西门子S72400为核心的变频控制系统在反渗透海水淡化装置中的应用,给出了控制系统的工作原理、硬件集成和软件设计方法。     

SIMATIC S7-300在测温取样系统中的应用

阐述了测温取样系统在钢厂生产应用的重要性。重点介绍测温取样系统的电气控制主要功能，基本结构及配置。并给出系统应用实例，介绍系统的控制实现过程。该系统是PLC和变频器成功的组合运用，取得了很好的效果。     

PLC和变频器在空压机节能改造中的应用

针对空压机能耗大，噪音火，自动化程度低等缺点，提出利用可编程控制器和变频器实现对螺杆式空压机的节能改造方案。实验结果表明，该方案自动化程度高，节能效果明显，具有很大的实用价值。     

无刷直流电机调速系统中的电子换向器

介绍了8098单片机控制的脉宽调制（PWM）电子换向器在无刷直流电机调速系统中的应用。主要介绍了绝缘门双极晶体管（IGBT）逆变器的触发电路和驱动电路。本设计结构简单、经济并具实用性。     

用LabWindows/CVI实现多台变频器的网络控制

利用美国NI公司的LabWindows／CVI虚拟测控软件具有的超强实时数据采集和处理能力及丰富的罔形界面的GUI设计功能，进一步开发了变频器的通信控制，为实现变频器等通用设备特定的控制算法、控制模式（如多级分布式控制）、数据处理格式等新的工业控制形式和内容提供了有力支持。     

公共直流母线系统在钢管生产线上的应用

介绍了公共直流母线系统在钢管生产线上的应用。并对多传动装置的各种结构配置方案的优缺点进行了比较和描述。