某社保(终端/便民/访客)服务器终端EMC整改案例分析

介绍了某社保(终端/便民/访客)服务器终端在电子产品电磁兼容认证中经常遇见的辐射骚扰和传导骚扰测试项目,重点从PCB板级电路EMC设计方面进行测试不合格原因分析,并给出整改对策。并由此案例引出电子产品电磁兼容设计时的注意事项,以图能给电子产品设计工程师提供参考,使其能以较高概率一次性通过EMC认证。     

电源线传导干扰诊断和整改方法研究

本文介绍了电源线传导干扰的基本概念和特点,根据差模/共模干扰原理,提出了几种差模/共模干扰诊断方法。在此基础上,结合滤波器原理,对差模/共模干扰各自的整改方法进行了分析。最后列举了实际整改案例,验证了相关方法。     

使用不同钢锅对电磁炉传导测试结果影响的实证研究

在IEC 61000-3-2:2020中,对于电磁炉谐波电流测试要求使用平底钢锅作为负载锅测试,而在CISPR 14-1:2020中,对于电磁炉传导骚扰测试要求使用搪瓷钢锅作为负载锅测试.本文将就电磁炉传导骚扰测试中,使用平底钢锅和搪瓷钢锅为负载对测试结果是否存在显著差异进行实证研究,并依据实证研究结果进一步对CISP...     

标准动态

<正>《电动汽车传导充电互操作性标准》征求意见终稿发布2017年《电动汽车传导充电互操作性标准》征求意见终稿已经发布,电动汽车及充电桩行业即将具备一个详细的测试标准。在这个测试标准的监督下电动汽车与充电桩的兼容匹配性将会大大提高。1)测试系统组成标准中首先提及了交流充电桩测试系统的组成,主     

整车辐射抗扰问题排查及整改分析

本文通过对按照GB 34660-2017《道路车辆电磁兼容性要求和试验方法》进行整车辐射抗扰测试出现仪表闪屏的典型案例分析,系统的介绍了骚扰源定位、传播路径确认、问题整改及验证的全过程,给出了辐射抗扰问题排查分析及整改的基本思路。     

汽车电子电器EMC标准差异的研究——IS07637-2:2011与IS07637-2:2004

本文着重介绍了《道路车辆——由传导和耦合引起的电骚扰:沿电源线的电瞬态传导》IS0 7637-2:2011与ISO7637-2:2004的差异,对测试布置要求,瞬态脉冲抗扰度的测试等级,瞬态脉冲发射的限值等方面都进行了深入的研究.     

舰船电控柜类产品的电磁兼容整改措施

随着舰船装备上电磁环境的日益复杂化,电控柜类产品安装前一般都需依据相关标准进行电磁兼容测试。屏蔽、滤波和接地是电磁兼容测试后整改最常用到的三种方法,本文针对这三种方法分别阐述了具体有效的整改措施。     

基于某型电子机柜的电磁兼容CE101整改方法研究

本文以某型电子机柜电磁兼容CE101测试项超标为例,介绍了常用的CE101整改方法以及电源滤波器的选型建议,供大家参考。     

电源适配器输出端口骚扰电压测量方法

电源适配器的直流输出端口骚扰电压过高会造成笔记本计算机电信端口传导骚扰电压测试不合格,但是标准中缺乏直流输出端口骚扰电压的测量方法。设计了一种电源适配器直流输出端口传导骚扰电压测量方法,在不需要配置笔记本计算机的环境下使用电源适配器单体模拟电信端口测试,其测量结果可以用于预测电源适配器在笔记本电脑电信端口产生的共模传导骚扰电压。经实际实验结果,用此方法测得的直流输出端口骚扰电压谱线与搭配笔记本计算机后的电信端口骚扰谱线有很好的对应性。     

AMT控制器传导电磁敏感度研究

AMT控制器作为汽车控制系统中的核心部件，极易受到电磁干扰，并导致传输信号误码率增高、传输中断、甚至传输错误指令。结合GJB151B-2013对军用设备和分系统电磁发射和敏感度要求与测量，进行CS101、CS106、CS114、CS115和CS116五项电磁兼容性指标测试。测试结果证明，AMT控制器抗电磁传导干扰能力满足敏感度判据要求，AMT控制器设计具有很好的抗电磁传导干扰能力。     

羧酸盐型双子表面活性剂的合成及性能研究

以月桂酰氯、乙二胺与丁二酸酐为原料合成了一种羧酸盐型双子(gemini)表面活性剂。采用IR、1 HNMR对中间产物和目标产物进行结构表征,并考察了合成所得羧酸盐型gemini表面活性剂的表面活性。结果表明:合成产物即为目标产物。合成产物的临界胶束浓度为0.027mmol/L,比普通单链表面活性剂低2～3个数量级,表面张力最低可降至29.5mN/m。     

与电信端口相关的电磁兼容干扰和防护设计

本文针对和电信端口相关的常见的电磁兼容检测项目,分析不合格的原因,并给出整改措施.同时,给出电信端口的电磁兼容干扰抑制,和电磁兼容防护设计方法.最后,给出一个实际应用当中的电路图,对本文中提到的方法加以总结和说明.     

The Climate Value of Cycling

The reduction of CO₂ emissions constitutes one of the largest challenges of the current era. Sustainable transportation, and especially cycling, can contribute to the mitigation of CO₂ emissions since cycling possesses an intrinsic zero‐emission value. Few studies have been conducted that appraise the CO₂ reduction potential of cycling. Opportunity costs enable the estimation of avoided CO₂ emissions resulting from bicycle trips. The methodology developed in this research allows the attribution of a climate value to cycling by substituting bicycle trips with their most likely alternative transportation modes and calculating the resulting additional CO₂ emissions. The methodology uses data on the current modal shares of cycling mobility, the competition of cycling with other transportation modes, and CO₂ emission factors to calculate the climate value of cycling. When it is assumed that the avoided CO₂ emissions of cycling mobility could be traded on financial carbon markets, the climate value of cycling represents a monetary value. Application of the methodology to the case of Bogotá, Colombia — a city with a current bicycle modal share of 3.3% on a total of 10 million daily trips — results in a climate value of cycling of 55,115 tons of CO₂ per year, corresponding to an economic value of between 1 and 7 million US dollars when traded on the carbon market.     

A new health and environmental regulatory and risk scoring index

Products or product lines (portfolio items) are often ranked and classified according to their market growth and profitability potentials. Such ranking does not typically address the potential for posing health and environmental risks, nor does it formally consider the current or future regulatory climate or the customer/consumer perception of the product. This article describes a product screening procedure—Health and Environmental Regulatory (HER) Index—that addresses all of the above issues in a qualitative to semiquantitative manner. For each of the eight products addressed during the development of this procedure, we reviewed three subsystems along the product life cycle—manufacturing, distribution, and the customer/consumer. We posed a series of questions and qualitatively scored each one based on relationships among portfolio items and overall corporate, industry, and regulatory benchmarks. Using these results, we developed a product score or index. The multidisciplinary project team provided expert input and a reality check on the results. We have found the HER Index to be a potentially important tool for product risk ranking and priority setting for environmental, health, and safety resource allocation and of significant use in Responsible Care product stewardship.     

The rise of ingredient disclosure: The California and New York experience

In the recent past, two important states—California and New York—have launched extensive and precedent‐setting ingredient disclosure laws regarding cleaning products with the clear goal of prompting the deselection of certain chemical substances and forcing product reformulation. Industry prefers to refer to this trend as “ingredient communication,” a goal we can all agree is desirable. By whatever name, these state measures will have a significant impact on ingredient disclosure trends across product lines, likely well beyond their stated application to cleaning products. These state laws are summarized below, followed by a discussion of their similarities, key differences, and their implications.     

Stabilising secondary materials markets

This paper argues that ‘secondary materials’ — waste products — are now an integral part of the global commodities problem. It analyses the background to attempts being made in several advanced economies to intervene in secondary materials markets. The forms of intervention are exact analogues of those that have been tried, or are being considered, and centre on buffer-stock schemes which aim to stabilise prices. In turn, stabilised markets have been thought to be a prerequisite for increasing the long-run supply of secondary materials. The paper casts doubt on the usefulness of such schemes for a selected product — waste paper — and presents a simulation exercise for the existence of a buffer-stock scheme.     

居民低碳消费行为及碳排放驱动因素的实证分析——基于杭州地区的调查

人为碳排放在碳减排中发挥着独特的作用,而实现低碳消费方式是促进碳减排的重要途径.基于杭州地区常住居民的调查数据,对样本居民的交通消费、生活能源消费和消费习惯等三个方面进行了行为比较,测算了居民的生活性能源碳排放量,并通过构建计量模型分析了居民碳排放的影响因素.其中,居民收入水平、最近一周是否使用过一次性产品、地域因素等对居民碳排放有着显著影响.以此为基础,提出了引导居民转变传统消费模式,提升低碳消费意识等政策依据.     

工业治污运营的新模式——系统化合同减排模式

分析了目前国内工业废水治理的现状及传统工业治污模式的弊端,对工业治污专业运营的新方式—系统化合同减排模式进行了探讨,指出该系统化合同减排模式是工业治污切实可行的途径,积极推行之,必将有力促进政府、金融机构、排污企业和治污企业形成合力,各施其职、各负其责,可进一步推进工业治污的技术创新,降低治污成本,使工业污染治理取得事半功倍的效果。     

An environment-friendly engine selection methodology for aerial vehicles

Emitted exhaust gases from aircraft are an issue of concern from an environmental perspective. Many research studies have been conducted aiming to reduce aircraft emissions in the hope of preventing any further increase in climate change and global warming. Within this scope, the present study intends to present a methodology for an optimum gas turbine engine selection with regard to emitted exhaust gases. The methodology focuses on five different turbofan engines which constitute the power unit of a commonly used passenger aircraft. At the end of the study, it is considered to be impossible to achieve a minimum exhaust emission for each gas. For this reason, it is considered to be better to optimize the engine with the aim of reducing nitrogen oxide emissions or other exhaust emissions.