SiC BJT的新型高速低损驱动电路设计

SiC BJT新型器件是IGBT器件的有力竞争对手,由于SiC BJT是电流型器件,设计适应于SiC BJT的电流型驱动电路非常重要。针对传统双电源阻容RC(resistance-capacitance)驱动电路的不足,设计了一种双电源阻性时序驱动电路。该驱动电路由开通支路、稳态支路和关断支路3个支路组成,通过延时电路产生不同的驱动信号,分别控制3个驱动支路。该结构可以解决传统RC驱动电路的占空比问题和驱动振荡问题,和传统RC驱动电路相比较,其驱动损耗减小很多。为了验证新驱动电路的优势,对两种驱动电路分别进行LTSPICE仿真,并制作了对应的驱动样板,仿真和实验结果验证了所提出方案的良好驱动性能。     

DC-DC变换器驱动电路综述

详细研究了光耦驱动电路、浮地自举驱动电路、正激式隔离变压器驱动电路以及电容耦合式隔离变压器驱动电路的工作原理。阐述了这几种驱动电路的优缺点及不同驱动电路的应用场合和应用时的注意事项,并通过实验进行理论验证。     

一种改进型隔离互补驱动电路

在有源箝位互补驱动的应用中,针对传统变压器隔离互补驱动电路难以加入死区的问题,提出一种改进型互补驱动电路。在驱动隔离变压器次级加入死区产生电路,通过调节死区产生电路的参数可设定死区时间。该驱动电路具有电路简单、可靠性好、成本低等优点,实验结果验证了该驱动电路的正确性和可行性。     

一种功率MOSFET半桥驱动电路设计

设计了一种用于MUPS装置的功率MOSFET半桥驱动电路,该电路基于TC4420芯片配合SG3525芯片作为驱动和控制模块,提高了逆变器驱动电路正常运行的稳定性。揭示了该MOSFET驱动电路的机理,设计计算了控制和驱动芯片外围电路及主要参数。并通过软件Saber搭建了该模块的仿真模型,仿真结果证明了该驱动电路的可行性。     

大功率晶体管基极驱动电路的改进

介绍了为直流电机ＰＷＭ调速系统而设计的大功率晶体管基极驱动电路。讨论了大功率晶体管对基极驱动电路的要求，提出了基本驱动电路和具有自动调节，自动保护功能的改进型驱动电路，并分析了该驱动电路的工作原理。     

高可靠性变频解耦隔离驱动电路的研究

驱动电路的合理设计对整机性能及可靠工作至关重要。文中介绍了双凸极永磁电机(简称DSPM M )功率驱动系统,得出系统对功率变换器驱动电路的设计要求,设计制作了驱动频率可变、解耦驱动、有关断反压的隔离驱动电路。通过驱动电路实验及系统联试证明了该驱动电路的正确性和可行性。     

多管并联SiC MOSFET驱动电路设计

分析了SiC MOSFET驱动电路的基本要求,并对驱动电路的结构、驱动电压的选取和可靠性设计等进行了重点研究,设计出一款简单实用的驱动电路,解决了多管并联的SiC MOSFET。驱动这一难题。另外,搭建了双脉冲实验电路对驱动电路进行了相关测试,分析确定了最佳门极电阻的参数和缓冲吸收电路。最后,将所设计驱动电路应用于50 kW/800 kHz的多管并联感应加热电源,进一步验证了所设计驱动电路适用于高频、大功率场合,具备一定的工业应用价值。     

基于EXB841的IGBT驱动与保护电路研究

本文叙述了绝缘栅双极型晶体管IGBT对驱动和保护电路的要求。并简要介绍了IGBT专用驱动芯片EXB841的驱动原理,进而针对EXB841典型IGBT驱动保护中存在的不足,提出了采用过流检测电路精确调整过流阈值,延迟电路识别虚假过流和过流锁定,采用外部成型电路提高负栅压和系统应用中及时的故障显示等改进方法。设计了相应的优化驱动电路,优化驱动电路在脉冲发生电源中得到应用。实际运行表明优化驱动电路克服了EXB841典型驱动的不足,改善了IGBT的驱动与保护性能,具有很好的实用性。     

基于光耦ACPL-339J的IGBT驱动电路设计

针对大功率IGBT对驱动和保护电路的要求,采用ACPL-339J智能IGBT门驱动光电耦合芯片设计了大功率IGBT的驱动电路,包括驱动信号整形电路、去饱和(DESAT)电路、门极驱动保护电路等。并且使用改进Push-Pull拓扑结构设计了高效简单的DC/DC隔离电源电路,计算了隔离变压器的设计参数。最后,通过双脉冲和短路实验验证了驱动电路的快速响应能力、安全性、稳定性。     

多电平变换器开关管的光纤隔离驱动保护电路

为解决开关器件在多电平高压功率变换器的驱动和保护问题,提出了一种光纤隔离的驱动保护电路。该电路与传统的驱动电路相比,隔离电压高,用光传递驱动信号不受电路的电磁干扰。电路在开关管过流时能识别是否真过流并实现驱动脉冲的慢关断,提高了电路安全性。实验结果证明,该电路正确可行。     

场控功率器件变频信号隔离式驱动电路应用

本文论述了适用于场控功率器件变频信号的隔离式驱动电路，包括光耦隔离式驱动电路和磁耦隔离式驱动电路。分析了这类驱动电路的结构原理、特点及应用接线，并给出了试验波形。这类驱动电路在AC／AC、DC／AC、AC／DC变换器中具有重要应用价值。     

故障类型及换位方式对同杆双回线回路间耦合影响的研究

从理论上分析了不同换位方式对两回路间耦合的影响，建立了同杆双回线路研究模型，用EMTP方法计算了一回停运检修时运行回路在正常和故障情况下对检修回路的耦合电压与电流，结果表明换位方式是双回线回路间耦合的决定因素；当带电回路发生故障时，停运检修回路应采取严格的安全保护措施，还提出了实际操作中的几点注意事项。     

智能变电站二次系统物理回路建模方法及设计实现

智能变电站二次系统逻辑回路遵循IEC 61850建模,而物理回路的设计仍采用图纸表达,不利于智能变电站信息化技术的发展。借鉴逻辑回路的建模思路,提出二次系统物理回路的建模方法。设计了基于虚实解耦理念的物理回路模型配置流程;给出了物理回路模型的语法语义;实现了基于物理回路模型的完整工程应用解决方案,包括物理回路配置工具、物理回路可视化工具。关键的是采用虚实对应技术,实现了物理回路和逻辑回路的关联。填补了二次光缆和网络结构的模型配置空白,便于设计工具和厂站级系统导入和导出物理回路配置,扩展了物理回路模型的应用空间。     

Positive‐real property of passive fractional circuits in W‐domain

Fractional circuits have attracted extensive attention of scholars and researchers for their superior performance and potential applications. Fractional circuits constitute a new challenge for the analysis and synthesis methods of traditional circuits theory. Passivity is the fundamental property of traditional circuits (integer order electric circuits). As is known to all, passivity is equivalent to positive realness in traditional linear circuits. However, this equivalence is broken down by introducing fractional elements into electrical networks in s‐domain. To address this issue, on the basis of s‐W transformation, we study the passive criteria of fractional circuits with rational order elements in this paper. Definitions of positive‐real (matrix) function in W‐domain are given, and the equivalence conditions of positive realness are derived. In addition, a conclusion is proposed in which the immittance (matrix) function of passive fractional circuits with rational order elements is positive real in W‐domain. The applications of passive criteria in circuit synthesis are shown.     

Novel dual auxiliary circuits for ZVT-PWM converters

Novel active auxiliary circuits that allow the power switch in single-switch, pulse-width-modulated (PWM) converters to operate with zero-voltage switching (ZVS) are proposed in this paper. The main feature of these circuits is that the auxiliary switch can operate with a zero-current switching turn-on and turn-off without increasing the peak current stresses of the main switch. In this paper, the operation of active auxiliary circuits in general is reviewed, and a systematic method for synthesizing auxiliary circuits belonging to the new family is presented and demonstrated with several examples. Several new auxiliary circuits are presented, and the operation of one of the new circuits is briefly explained. A general set of guidelines for the design of auxiliary circuits belonging to the new family is presented. The feasibility of the new family of circuits is confirmed by experimental results obtained from a 500W, 100 kHz zero-voltage-transition (ZVT)?PWM boost converter prototype implemented with an example auxiliary circuit.     

A design of MOSFET‐C impedance simulation circuits based on a GIC

This paper proposes a systematic design method of MOSFET‐C impedance simulation circuits based on a generalized immittance converter (GIC). The design method can realize inductance simulation circuits, capacitance multipliers and frequency‐dependent negative resistances (FDNRs) only by MOSFETs, capacitors and two operational amplifiers. Although MOSFETs are used instead of passive resistors, the realized impedance simulation circuits have good linearity since the nonlinearity caused by MOSFETs are cancelled out. The proposed design method derives three inductance simulation circuits, five capacitance multipliers and two FDNRs systematically from a GIC. All of them are summarized in this paper. As an example, inductance simulation circuits are designed by using the proposed design method. The inductance simulation circuits are applied to a filter realization and validity of the design method is confirmed by HSPICE simulations. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

变电所二次回路设计中的注意事项

变电所的二次回路是变电所二次系统的重要组成部分,各种继电保护、自动控制装置离开二次回路就不能正常工作。该文根据现场工作的经历,总结了几个影响二次设备安全运行典型事例的教训。从回路设计的角度分析了二次回路设计对二次设备安全运行的影响,提出了一些优化二次回路设计、提高二次回路安全性的具体措施。     

基于DSP的三相交-交变频器控制系统

研究了基于DSP的三相交 -交变频控制系统 ,并设计了相应的零电流检测电路 ,同步信号检测电路和I/O扩展电路。实验结果表明该方案是可行、正确的     

电压型逆变电路控制方法的分析

介绍了逆变电路的几种控制方法,通过对电压型逆变电路全桥和半桥结构进行对比,分析了两种逆变电路的原理和特点,为逆变电路的实际应用提供了理论依据。     

High output impedance CMQOs using DVCCs and grounded components

In this paper a new circuit topology for realizing second‐order current‐mode quadrature oscillator is proposed. Three additional circuits are further derived from it, thus resulting in four distinct circuits. Each circuit employs three differential voltage current conveyors and all grounded passive components, ideal for IC implementation. All the circuits possess high output impedance. The circuits exhibit non‐interactive frequency control and low THD. The effects of non‐idealities are also analyzed. PSPICE simulations using 0.5 µCMOS parameters confirm the validity and practical utility of the proposed circuits. Copyright © 2010 John Wiley & Sons, Ltd.