Development of an integrated CAD tool for switching power supplydesign with EMC performance evaluation

A computer-aided tool for the design of switching power supplies integrating a layout editor, autorouter, component library builder and EMI simulator is presented. The software takes on a modular approach and develops the printed circuit board (PCB) layout with emphasis on electromagnetic compatibility (EMC). The prediction of interference level is achieved by SPICE simulation with suitable model assignments of EMI sources, components, and PCB tracks. An offline forward power converter is built and measured to verify the simulated result. Finally, a performance index is introduced to act as an indicator for the EMC performance of a given PCB layout     

固态继电器PCB稳态电磁辐射的仿真分析及优化

基于固态继电器印刷线路板(PCB)体积小、布线紧密和电磁辐射发射较强,采用Ansofi软件建立了含有控制电路、主回路的固态继电器PCB上连线的仿真模型.计算了处于稳态下的固态继电器PCB的电磁辐射发射电平,得到该电平与PCB布线方式、环路面积的对应关系.通过PCB布线方式、环路面积优化,降低了PCB电磁辐射发射电平,提高了电磁兼容性.     

电子仪器PCB设计中EMC技术的应用

以数码录音机设计为例,介绍应用PROTEL99SE软件进行PCB布板设计的方法,对PCB设计中的电磁兼容性、信号完整性和电源完整性、热设计以及静电放电防护等技术问题进行论述。通过对应用EM78860微处理器、DL16521数字信号处理器进行数码设备设计过程的介绍,给出电子仪器产品PCB设计的优化建议。     

大功率电源控制器EMC设计

描述了大功率电源控制器EMC设计的一般原则,并从器件选择、PCB设计、工艺设计、机壳屏蔽、功率器件EMC等多方面进行了EMC详细设计。采取接地、布局、布线、屏蔽、滤波等多项措施进行综合治理,提高电源控制器的EMC性能,达到预期效果。     

通过串音预测实现PCB的电磁兼容性设计

对PCB串音进行分析 ,归纳出影响串音的因素 ,以便在PCB设计中能够采取针对性措施 ,从而有效地降低串音和EMI水平。主要从PCB地线面结构布局方面考虑串音问题 ,通过分析不同地线面结构对串音大小的影响 ,得出部分满足电磁兼容性的PCB设计原则。     

开关电源的电磁兼容设计

本文就开关电源EMI特点，开关电源的EMC设计中软开关技术在开关电源中的应用、开关电源的EMI抑制技术、印刷线路板元件布置和布线的计算机辅助设计等问题，进行了系统、简明、扼要地分析和讨论。     

延时继电器电磁辐射干扰分析

针对电磁继电器在动作时产生的辐射干扰会影响延时电路,采用Ansoft HFSS建立了含有电磁继电器和延时电路PCB的仿真模型,计算了在电磁继电器动作时PCB上主要走线上的感应电压,分析了感应电压对延时时间等参数的影响,评估了电磁继电器机壳对整体电磁兼容性能的影响。该研究成果对提高延时继电器的EMC及可靠性具有一定的意义。     

变频器EMC设计及典型试验方法研究

变频器以其节能显著,保护功能完善,调速性能好,使用维护方便等优点,占据了交流电机调速的主导地位.在推广应用中,工业现场的电磁干扰(EMI)问题日益突出,直接影响到变频器的稳定运行.对此,根据变频器的电气电路结构,详细分析了变频器主回路、控制回路、驱动电源电路、PCB板、接地方式等设计中改善电磁兼容性(EMC)的问题;探讨了变频器设计中解决EMC若干措施及验证设计的典型试验方法.提供了具体试验案例分析,具有很好的实用参考价值.     

A novel course on microwave monolithic integrated circuit design, theory, and characterization

A novel course conducted for the past three years at the National University of Singapore is described. The course design projects introduce students to microwave monolithic integrated circuit (MMIC) component and subsystem design and expose them to modern computer-aided design (CAD) tools, industry standard test equipment, and procedures. In addition, since the proposed topics are industry-collaborated research projects, students gain new enthusiasm for the circuit design and directly see the importance and relevance in the engineering field. In contrast to the available MMIC courses conducted in the other universities or organizations, these students are given the complete freedom to implement the hardware within a fixed time frame. Implementation of these MMIC circuitries using external foundries, such as United Monolithic Semi-conductor (UMS), Philips Microwave Limeil (PML), and Triquint, has proven to be highly motivational and educational and, eventually, has led to increased enrollments in other higher level electromagnetic and microwave circuit modules.     

Synthesis tools help teach systems concepts in VLSI design

The VLSI project class at Princeton University has been redesigned, using modern logic and layout synthesis tools, to emphasize system design issues. The design methodology taught in the class allows students to build larger designs; it also allows them to learn, by redesign, how to trade off layout, circuit, logic, and architectural design problems. Two synthesis tools were developed (based on the Oct tool set from UC Berkeley) to generate standard cell layouts: one which takes as input finite-state machine transition tables; and one which generates netlists using C programs. The author describes; what is important for students to learn in a VLSI design class; the design methodology developed to teach this curriculum through a design project; and the CAD tools used to support this design methodology     

开关电源印制电路板的设计

本文从电路板基材、布局和布线、焊盘等方面介绍了开关电源印制电路板的设计方法,对电磁兼容设计有一定的作用。     

开关电源PCB电磁兼容特性的仿真分析及其改进

随着开关电源工作频率不断提高,电磁干扰问题也变得日益严重,结合LLC半桥谐振开关电源的设计实例,首先分析了高频传导干扰对PCB电磁兼容性的影响。在EMC分析中,使用Cadence SPB 16.3与Ansoft Designer 6.1相结合的方法,基于场的原理,建立PCB仿真模型,分析LLC半桥谐振开关电源PCB的电磁兼容特性。其次,根据电磁场近场分布图,对PCB的布局布线加以改进,提高了PCB的电磁兼容特性。最后,仿真结果表明其电磁场强度有较大幅度减小,同时进一步验证了设计阶段中针对PCB改进的合理性。     

ZX系列变流装置EMC结构设计及安装相关问题分析

国家标准对电气产品电磁兼容性的要求有明确的定义,因而在电气产品设计安装过程中需要同步将EMC相关要求纳入考量范围。总结了相关EMC基本原理与现有设计方法,针对现有ZX产品系统构造特点,进行屏蔽材料属性的分析与计算并完成材料的选择和产品主要部件结构布局的分析与优化,并对产品实际安装中遇到的问题进行了分析与总结。完成了ZX系列产品EMC整体结构改进,为相关电气产品的EMC设计提供了参考和依据。     

智能电器控制板EMC仿真与优化

为了尽早地在产品设计阶段解决电磁兼容问题,设计师需要进行基于理论分析和协作设计的EMC仿真。本文采用Ansoft SIwave软件,仿真分析了PCB中高频谐波干扰对智能电器控制板电磁兼容性产生的影响。最后,基于仿真结果对PCB的设计进行了优化。经实验证明,控制板的EMC问题得到了有效的解决。     

中压开关柜在线监测系统硬件抗电磁干扰技术研究

从在线监测系统的电源、信号传输、PCB布局分区、布线等方面入手,介绍了提高在线监测系统抗电磁干扰的方法。实验证明,采用该方法设计的在线监测系统,抗电磁干扰性能得到较大提高,已经通过了国家高压电器质量监督检验中心电磁兼容性严酷度等级3级标准的试验。     

Practical issues in high speed PCB design

Current high-speed PCB (printed circuit board) designs need extra care due to the frequency of operation and reduced rise time signals. We present the main issues and parameters that a PCB designer has to consider and analyze before a board layout is created. First order approximation equations for various parameters are presented, based on the geometry of the PCB traces. Some useful design practices are also mentioned. As the speed of operation increases, the variables that are neglected in the lower frequency/higher rise time situation become more significant. Such parameters increase the complexity of the design. Three-dimensional analysis becomes a must to calculate and model interconnects accurately. This is where field solvers and the role of the signal integrity engineer come into play.     

电力电子装置电磁兼容研究最新进展

随着电磁兼容法规在海内外的普遍实施,电磁兼容问题在电力电子领域受到了越来越多的关注.本文回顾了国内外最近几年对电力电子装置电磁兼容/电磁干扰问题的研究进展,所涉及的内容包括功率变流器的电磁干扰建模及抑制技术、电机传动的电磁干扰建模及抑制技术、EMI滤波器的寄生效应、PCB优化布局以及EMI的电磁计算技术等.最后讨论了电力电子装置电磁兼容技术的发展趋势.     

双绞线电磁干扰防护研究

水下自航器紧凑而狭小的结构要求其内部大量的线缆成束敷设,这使得线缆串扰问题成为其系统电磁兼容性设计一个关键考虑因素,双绞线凭借其良好的电磁兼容(EMC)特性在水下自航器中被广泛采用。基于线缆串扰的传输线模型,对比分析了单线与双绞线的抗干扰特性,并重点对双绞线端接不同负载下的抗干扰能力进行了仿真与试验研究。试验结果表明双绞线端接负载对其抗干扰能力有比较明显的影响,实际电磁兼容工程设计中必须予以考虑。研究结果可用于指导水下自航器中线缆布局的电磁兼容性优化设计。     

去耦电容在PCB板设计中的应用

在PCB板设计中应充分考虑电磁兼容方面的问题，合理地使用去耦电容在PCB板防止电磁干扰中具有重要作用，本文就去耦电容的容量及其具体应用作了较为全面、详细地叙述,同时还介绍了增强去耦电容效果的一些实用方法。     

雷达电磁兼容设计与测试

雷达工作的电磁环境非常恶劣,电磁兼容是雷达性能.分析了雷达自身的特点和电磁防护的困难,从系统布局、电磁屏蔽、接地、滤波等方面综合考虑设计,解决了雷达系统的电磁兼容问题.测试实验验证了设计的有效性,对其他雷达的电磁兼容设计也具有参考价值.