Vacon 100 HVAC专用变频器

Vacon 100 HVAC产品非常易于操作。一般日常的基本功能可以简单地通过时尚的图形用户界面直接操作,更多的应用功能可以通过Vacon标准的程序工具来实现。该产品符合新的抗干扰标准IEC／EN61000—3—12的要求。     

面向100-800W电源系统应用的双相交错PFC控制器UCC28061

德州仪器在UCC28060基础上推出的UCC28061转换模式双相交错功率因数校正控制IC，在100～800W的大屏幕液晶电视、个人电脑、家用音频设备及LED路灯等的电源系统中应用，可以完全满足IEC1000—3—2、EN61000—3—2等标准对工频谐波电流的限制要求，并能降低电源系统陈本和能耗，符合轻载效率标准。     

25W离线式可调光恒流LED驱动器模块

由工频市电供电的离线式恒流LED驱动电路的发展趋势是集成化、模块化、小型化、轻量化及高性能和可靠性。 在IEC1000—3—2等标准中,只对25W以上的C类（即照明）设备的工频输入电流谐波规定了限制要求。后来的标准,如IEC61000—3—2和欧盟EN61000—3—2等,对25W及25W以下的照明电路的工频输入谐波电流也进行考核。因此,离线式AC—DC恒流LED照明电源应满足IEC61000—3—2谐波电流限制要求（例如三次谐波≤29．7％,五次谐波≤10％等）。与此同时,离线式LED照明电源还要满足能源之星固态照明在商业环境下功率因数不低于0．9的要求,在电磁干扰方面满足EN55015B和EN55022B的限制,并且要具有高能效。     

电源与调节器件

GlobTek公司医用桌面交换式电源供应器GlobTek公司发布了100W到120W的桌面电源系列,一个平台的输出电压范围从3.3V到48V,步长为0.1V。桌面式电源供应器系列封装在抗冲击的聚碳酸酯机箱中。该产品系列的特点有:低纹波单倍/双倍/三倍调节输出可达120W,以及具有内置保护的遥控感测。该产品输入为100V AC到250V AC的通用输入,满足UL/Demko/CCC/C-Tick牋60601-1的安全要求,并且符合EMI/RFI的规范和EMC指示,CE认证,可以用于接地及不接地设备。功率因数校正(PFC)可以作为标配,遵守EN61000-3-2和EN61000-3-3。可根据用户设计定制。…     

ESD保护电路的设计

静电放电(ESD)会给电子产品带来致命的危害,它不仅会降低产品的可靠性、增加维修成本,而且不符合欧洲共同体规定的EN61000-4-2标准,产品就不能够在欧洲销售。所以,电子设备制造商通常会在电路设计的初期就考虑ESD保护问题。本文将讨论ESD保护电路的各种方法。     

远方推出频率达1MHz的快速群脉冲发生器

远方公司自主研发生产的EMS61000-4A快速群脉冲发生器日前通过鉴定，该仪器完全符合IEC61000-4-4：2004、EN61000-4-4以及GB／T17626．4-1998的要求，它产生的瞬变脉冲群具有极短的上升时间，最高频率可达1MHz。     

外部干扰的抑制(六)

6.4电压波动与闪烁的发射6.4.1电压波动与闪烁的起因本节内容主要针对采用230 V/400 V交流供电的设备,此类设备通常需满足相关EMC标准(EN 61000-3-3与EN 61000-3-11)关于工作电流小于75 A的设备电压波动与闪烁发射要求,这些要求也适用于各种电压的交流与直流电源。如图6AU所示,配电网络中总会存在一(上接2012年第1期75页)     

EN 61000-6-1标准升级

通过与 EN 61000-6-1:2001的比较,介绍最新的欧盟电磁抗扰度通用标准 EN 61000-6-1:2007,指出相关电磁抗扰度测试项目和测试规格的更新,为电子产品出口企业和 EMC 测试实验室提供参考。     

0USB 2．0接口专用ESD保护IC

USBLC6—2P6（SOT-666）和USBLC6—2SC6（SOT-23）的典型电容为2．5pF，能够确保480-Mb／s数据传输速率的USB2．0信号没有任何失真，它们的防静电放电防护电压达到IEC61000—4—2第4级15kV标准。两款产品者具有极低的线路到地线电容，符合IEC61000—4—2第4级放电保护标准，集成Vcc保护单元。USBLC6最大漏电流仅为1μA，占板面积仅为2．9mm^2；     

基于iw2202控制IC的单级PFC数字开关电源

<正> 基于 iw2202数字控制器 IC 的开关电源是一种单级PFC 拓朴结构,即 PFC 级和 PWM 级共用一个控制器和一个功率开关,完全可以满足 IEC1000-3-2、EN61000-3-2/IEC61000-3-2等谐波限制标准要求,并能使电路元件数量节省60%。     

IEC 61000-3-2的修订

通过比较IEC 61000-3-2:2001和IEC 61000-3-2:2005内容上的异同,指出两个标准因引用IEC 61000-4-7不同版本,造成其内容差异较大,就主要差异内容进行了分析和说明,并给出了试验论据。     

IEC61000-3-12标准的分析与应用

为限制非线性负荷向电网发射的谐波电流，截止目前，共计颁布了两个关于谐波电流限制的国际标准，即IEC61000—3-2：2000和IEC61000—3—12：2005。为了更好地理解这两个标准，本文对这两个标准进行了详细比较，包括基本概念、适用范围等方面，熏点描述和分析了后者中新增的一些概念和物理意义，为了标准的理解与具体应用打下基础。针对单相低压交流电源供电的家用柜机变频空调的谐波电流抑制问题，为了适合IEC61000—3—12：2005，给出了两种输入功率6．6kW的单相完全有源模拟和数字PFC的具体设计和谐波电流测试结果。     

Helpful hints to select a power-factor-correction solution for low- and medium-power single-phase power supplies

This work presents a review of power-factor-correction (PFC) circuits for low- and medium-power single-phase power supplies. The main idea is not just to show the state of the art of this topic but to select the most interesting topologies for each application depending on the power level, the input voltage range, and the output voltage. Since IEC 61000-3-2 regulations came into force, many new topologies have been presented trying to obtain a cost-effective solution to reduce the input current harmonic content. Each one of them has its application range due to the inherent characteristics of the topology. Obviously, not every converter is useful for the same application. This is especially perceptible in PFC circuits due to the large amount of different solutions. Hence, this paper tries to show the most appropriate topologies for each application, being the input power and the IEC 61000-3-2 Class some of the main parameters to select it. The scope of the paper is focused on single-phase power supplies belonging to IEC 61000-3-2 Class A and Class D with an input power level below 4 kW.     

Regulating mains pollution

The latest additions to the EMC Directives, EN 61000-3-2 and EN 61000-3-3 (effective from 1 January 2001), are aimed at limiting the growing problem of equipment-generated distortion on electricity supply networks. For the present, the standards are targeted solely at equipment manufacturers; however in time they will also affect regional electricity supply companies and electricity consumers. A related measure, UK Engineering Recommendation G5/4, which also became effective on 1 January 2001 addressed the more general issue of allowable harmonic limits on electricity distribution networks. The author outlines the provisions of these new standards, designed to limit harmonic distortions in the electricity supply network     

用IEC 61000-4-20评定GTEM cell场均匀性的研究

介绍了IEC61000-4-20对场均匀性的规定,并采用此标准附录B推荐的两种场均匀性评判准则对GTEM cell均匀区的场均匀性进行了评定,发现采用两种不同的评判准则时,GTEM cell场均匀性的符合性评定可能会获得不同的结论。对产生不同结论的原因进行了分析,并提出了建议。     

用功率因数校正器(PFC)抑制电流谐波(1)

本文讨论了用功率因数校正器(PFC)抑制电流谐波和需要满足的标准GB17625.1-2003(IEC-61000-3-2).还讨论了如何用各种PFC技术满足此标准.     

Current programmed control of a single-phase two-switch buck-boost power factor correction circuit

This paper presents a new current programmed control (CPC) technique for a cascaded two-switch buck-boost converter suitable as a low-cost power factor correction (PFC) rectifier in a variable speed motor drive. This new CPC technique, which is an extension of the conventional CPC method, enables the variable output dc voltage, and is therefore suitable in a pulse amplitude modulated (PAM) motor drive or as a universal input-power supply. The CPC method is very simple and requires only a constant-current reference without any changes in the transition between boost and buck operating mode, and the line current is practically unaffected by the topology-mode shift. Simulations and experimental results verify the presented control technique. Compliance with IEC-61000-3-2 class A is achieved. The experimental setup is based on a commercial CPC integrated circuit (IC) for dc-dc converters. This new control technique enables a simple low-cost control circuit for the two-switch buck-boost converter, which complies with IEC-61000-3-2, and the PFC circuit has inherent in-rush and overcurrent protection.     

Testing times for analogue products

The test requirements of the second edition of the European generic immunity standard for residential, commercial and light industry environments (EN50082-1: 1997), differ substantially from those of the first edition (EN50082-1: 1992). In the first edition, the frequency range for radiated immunity testing was 27 MHz to 500 MHz. The second edition extends the frequency range to cover 150 kHz to 80 MHz (for conducted immunity) and 80 MHz to 1000 MHz (for radiated immunity). It also specifies that all RF tests feature amplitude modulation with 1 kHz at a depth of 80% in accordance with EN 61000-4-3 (radiated) and EN 61000-4-6 (conducted). Many product types that formerly complied with the radiated immunity test requirements are failing to comply with the amplitude modulation tests specified in the new edition. As a consequence, wise design engineers will want to re-examine their existing product designs, while reflecting carefully on specific areas on their new product development projects. The author offers guidance and advice for the concerned design engineer     

Single-stage AC-to-DC converter with self-driven synchronous rectification that complies with EN61000-3-2 regulations

When low output voltage and EN61000-3-2 compliance are put together, not too many options can be used, especially if the power range is between 300-600 W. This paper presents one of the best solutions to comply with both specifications at the same time: the use of a single-stage topology to comply with the low-frequency harmonic limits combined with a half-bridge converter with complementary control, which is a very good option to obtain low output voltages with high efficiency.