一种可变门极电阻的大功率IGBT驱动

通过分析大功率IGBT寄生参数及主功率回路寄生参数对IGBT驱动的影响,提出了一种基于可变门板电阻的驱动电路,提高了驱动模块的产品兼容性,实现了驱动器对IGBT开关特性的精确控制,有效抑制开关过程中由于di/dt引起的电压尖峰.最后在Sabor中搭建了型号为FZ1500R33HE3的大功率IGBT的仿真模型,并进行仿真分析;通过搭建实物平台进行了双脉冲实验.仿真和实验结果表明,该驱动电路具有可行性.     

一种新型的IGBT短路保护电路的设计

提出了一种直接检测IGBT发生短路故障的方法,在详细分析IGBT短路检测原理的基础上给出了相应的IGBT短路保护电路。仿真及实验结果均证明该电路工作稳定可靠,能很好地对IGBT实施有效的保护。     

感应加热电源的IGBT驱动保护系统设计

为提高感应加热电源的绝缘栅双极型晶体管(IGBT)信号源与保护电路的稳定性,设计了应用于工业化低频大功率感应加热电源设备的IGBT驱动保护系统。系统整体采用复杂可编程逻辑器件(CPLD)+数字信号处理(DSP)协同工作方案,由低频正弦脉冲宽度调制(SPWM)技术控制,以脉冲变压器2ED300C17-S为IGBT保护电路的核心,设计了IGBT故障处理电路、退饱和检测电路与有源钳位电路等多种保护电路。对系统进行理论分析与Matlab/Simulink仿真,搭建了实物测试平台。试验结果表明,当工件加热到900℃时,逆变器输出功率参数与负载端功率参数达到大功率感应加热电源要求,且信号源输出稳定性高、保护电路响应时间快。该设计为相关工业化应用提供技术支持。     

一种IGBT集电极电压测量电路的设计

由于大功率IGBT开通和关断集-射电压具有跨度大的特点,现有的大功率IGBT驱动检测电路无法同时实现宽范围、高精度的测量.为此提出了一种新的IGBT集电极开通和关断电压集成的测量电路.该电路通过电阻分压网络实现IGBT关断电压的测量;利用驱动信号来控制电流源向高压隔离二极管注入微小电流使其导通,并对此二极管误差进行补偿,实现IGBT导通饱和压降的精确测量.仿真和试验验证了设计电路的正确性和有效性,可为高压大功率IGBT高性能驱动器的研制奠定基础.     

新型驱动与保护电路在级联逆变器中的应用研究

级联逆变器中功率单元的驱动及保护通常采用分立驱动器件构成H桥的驱动及保护电路,由于各器件参数很难保证完全一致,导致电路工作不理想,且需要多个独立供电的电源,增加了系统设计的复杂性。针对上述问题,文章采用一种新型驱动与保护电路TX-DA841HD设计了单元级联型高压逆变器模型。该电路可同时驱动4个大功率IGBT,能够监视每个IGBT的集电极电流,具有缓降栅压结合软关断技术的短路保护功能,能够有效地保护H桥及级联系统。实验结果验证了该电路的驱动及保护能力。     

IGBT的驱动和过流保护电路的研究

本文首先谈论了IGBT的驱动电路的基本要求和过流保护分析,然后运用IGBT集电极退饱和原理,提供了一个采用分立元件构成的IGBT驱动电路和过流保护电路.仿真和试验结果证明了所设计驱动电路的可行性.     

大功率IGBT驱动保护技术的现状与发展

本文介绍了大功率IGBT驱动保护电路的种类及功能,同时对IGBT驱动保护技术的发展方向进行了展望。     

望远镜用大功率智能开关电源控制系统设计

根据望远镜轴系驱动电源的特性设计了基于脉宽调制(PWM)控制芯片和IGBT模块的大功率智能开关电源。主电路拓扑为全桥逆变电路,次级为全波整流电路,并采用智能接口将开关电源与上位机直接相连,同时还有输出短路、过流、过温、过压和欠压保护电路,大大简化了系统的设计,提高了系统工作的可靠性。对控制环路进行了详细的分析和设计,开关电源的输出电压连续可调,可满足不同规格的望远镜轴系驱动电源的要求。最后通过实验验证了系统设计的有效性。     

基于2SC0108T的IGBT驱动器设计

针对IGBT驱动电路复杂且保护功能不尽完善的问题,设计了一个基于2SC0108T的即插即用型IGBT驱动器,以及相应的前级驱动电路、后级功率驱动电路和故障报警电路.该驱动器具有直接模式和半桥模式、驱动信号硬件互锁、硬件死区时间可调节、IGBT过流及短路保护、驱动电源过欠压监控和易于安装的特点.结合英飞凌EconoDUA...     

大功率IGBT模块并联均流特性研究

大功率IGBT并联运行能够承受更高的负载电流,但是大功率IGBT并联设计时需要考虑静、动态均流问题。PSpice仿真分析表明,影响静态均流的主要因素是IGBT模块的饱和导通压降和集电极、发射极引线的等值电阻;影响动态均流的主要因素涉及驱动电路、IGBT器件参数和主电路布局。提出了IGBT并联均流的措施,分析了IGBT并...     

经纬仪伺服系统功率开关电源及控制系统设计

针对经纬仪伺服系统的直流电动机的特性设计了采用脉宽调制（PWM）控制芯片和集成功率模块（IPM）的功率开关电源,主电路拓扑为全桥变换电路,功率转换器件采用集成功率模块,简化了设计,同时还有输出短路、过流、过温以及欠压保护功能,大大提高其工作可靠性,并对控制电路和保护电路进行丁设计,其输出电压连续可调。可满足不同规格的直流力矩电动机电压要求l最后通过实验验证了系统设计的有效性。     

工矿电机车牵引新型IGBT斩波器

介绍一种新型工矿电机车斩波调速器。斩波器用门极可控的ＩＧＢＴ做为开关器件,省去了可控硅斩波器的强迫换流电路。用单片机实现了斩波器的控制。文章还介绍了斩波调速系统所采取的电流保护策略。     

Understanding retiming through maximum average-delay cycles

A synchronous circuit built of functional elements and registers is a simple implementation of the semisystolic model of computation that can be used to design parallel algorithms. Retiming is a well-known technique that transforms a given circuit into a faster circuit by relocating its registers. We give tight bounds on the minimum clock period that can be achieved by retiming a synchronous circuit. These bounds are expressed in terms of the maximum delay-to-register ratio of the cycles in the circuit graph and the maximum propagation delayd _max of the circuit components. Our bounds do not depend on the size of the circuit, and they are of theoretical as well as practical interest. They characterize exactly the minimum clock period that can be achieved by retiming a unit-delay circuit, and they lead to more efficient algorithms for several important problems related to retiming. Specifically, we give anO(V ^1/2 E IgV) algorithm for minimum clock-period retiming of unit-delay circuitry. For non-unit-delay circuitry, we describe anO(VE Igd _max ) algorithm for minimum clock-period retiming. We also describe anO(V ^1/2 E lg²(Vd _max ) algorithm for retiming with clock period that does not exceed the minimum by more thand _max — 1. Finally, we give anO(E Igd _max ) algorithm for minimum clock-period pipelining of combinational circuitry.This research was supported in part by the Defense Advanced Research Projects Agency under Contract N00014-87-K-0825.     

一种静电除尘脉冲电源及控制系统设计

针对常用的静电除尘电源在处理高比阻粉尘和超细粉尘时暴露出来的问题,设计了一种静电除尘用脉冲电源及控制系统,介绍了脉冲产生的谐振原理并给出了详细的计算公式。脉冲电源的控制系统是在DSP+FPGA联合控制的基础上,加上电源采样保护电路,确保电源的安全运行,重点设计了脉冲回路采样保护电路的脉冲一次侧过零过流电路,同时设计了一种DSP与FPGA组合控制的IGBT开关控制逻辑。     

On the delay margin of dead-time compensators

Dead-time compensators (DTCs) are frequently regarded as being excessively sensitive to uncertainty in the loop delay. Yet this claim is based mostly on empirical studies rather than on any rigorous analysis. In particular, despite existing literature on calculating the delay margin, μ _d, there appears to be no study of the underlying reasons of such a sensitivity. In this paper we address the latter issue. By applying Nyquist criterion arguments, we demonstrate that substantial deterioration of μ _d is caused by the crossover proliferation phenomenon, which, in turn, may be triggered by the use of DTC, especially when aggressive control strategies are used. We also show that crossover proliferation may give rise to the discontinuity of μ_d as a function of system parameters. We argue that the sensitivity of DTCs to delay uncertainty shows mainly through these discontinuity points, so that the robustness can be improved if the discontinuities are avoided.     

Optimal controls for stochastic systems with singular noise

Stochastic control systems of the form dx₁ = f(t, x, u_t)dt + g(t, x)db_t (0 t 1), with g singular and general cost, are discussed. It is shown that there is an optimal relaxed control u that depends on the past of x and the driving process b. Nonstandard methods are used.     

矿用变频器功率器件选型及其驱动保护设计

分析了煤矿井下设备对变频器功率器件IGBT的需求和在IGBT选型时需要考虑的电气参数,介绍了基于2SD315模块的IGBT驱动保护电路的设计。实际应用表明,采用文中介绍的方法选用的IGBT和设计的驱动保护电路后,变频器运行稳定,IGBT驱动有效,保护完善。     

A note on embeddings among folded hypercubes,even graphs and odd graphs

In this short note, we establish topological relationships among the folded hypercube FQ _n , the even graph E _k and the odd graphs O _d via embedding. Such embeddings are measured via dilation.     

Switching performances of static induction thyristor with buried-gate structure

The switching characteristics of SITh are not only determined by the conductance modulation in channel between the gate regions,but also affected by the external gate driving circuit.The physical mechanism and behavior of switching process are studied deeply based on the fabrication practice of SITh.The dependence of switching performances of SITh on material,geometric structure and technological parameters are analytically discussed by using two-dimensional dynamical model firstly proposed in this paper.A series of optimum matching technological approaches have been developed for improving the switching characteristics of SITh.A versatile testing circuit is designed to get more accurate switching parameters and more stable switching-off process with lower power consumptions.The switching times ton and toff are reduced from 0.2μs and 1.2μs to 0.08μs and 1.0μs,respectively,and the dynamic dv/dt value of more than 1000 V/μs at switching-off is obtained.