...and thus you might not comply. Has the new A14 been given a DOP and DOW? I haven't seen it yet. Normally, when new requirements are published there is a DOW for existing requirements. Isn't it typically about 4 years? If you've been gearing up to meet the existing EN61000-3-2 how could you be expected to have this rug pulled out from under you on and immediate basis?
Regards, Glenn Lesmeister Product Regulatory Compliance Compaq Computer Corp. Tel: 281-514-5163 20555 SH 249, MS60607 Fax: 281-514-8029 Houston, TX 77070-2698 Pgr: 713-786-4930 glenn.lesmeis...@compaq.com "I am empowered to do what makes sense!" -----Original Message----- From: plaw...@west.net [mailto:plaw...@west.net] Sent: Tuesday, December 12, 2000 10:58 AM To: EMC-PSTC Subject: Re: Passive PFC (original post by lfresea...@aol.com) When systems are tested using these techniques, make sure the latest version of EN61000-3-2 is used, incorporating Ammendment 14. Previously, simple techniques could be used to modify the input current waveform, and distort it outside the 'special waveform' envelope shown in figure 1 of the standard. This enabled you to use the less-stringent Class A limits. With the incorporation of Ammendment 14, there is no evaluation of the input current waveform to determine the test limit. The application alone will determine the test limit used. ---- Patrick Lawler plaw...@west.net On Tue, 12 Dec 2000 10:03:50 +1100, Jon Keeble <j.kee...@fairlightesp.com.au> wrote: >You may be interested in a paper > >Power Factor Correction for AC-DC Converters with Cost Effective Inductive >Filtering > >by > >W.Wölfle Convertec Ltd., Wexford, IRELAND >W.G.Hurley National University of Ireland Galway, IRELAND >S.Arnold Enserb Bordeaux, FRANCE > >To quote the conclusion: > >This paper presents a new, simple and cost effective solution >for the power factor correction of the input current of a >switch mode power supply, which meets the IEC limits on >harmonic distortion. A sloped air-gap inductor, which adapts >its inductance values to the input current conditions of the >power supply, is used to shape the current to comply with the >limits for harmonic distortions as defined in EN61000-3-2. > >It is shown that using a classical inductor design, the filter >inductor is too bulky, whereas the volume of the sloped air-gap >choke is as small as the switching transformer of the >power (e.g.100 kHz) supply. In fact, the volume required is >not bigger then that required for an active PFC circuit, but at >a fraction of the cost. > >The .pdf is too large to post, but I'll mail a copy to the first ten >callers ... > >Seasonal Greetings > >----------------------------- >Jon Keeble >Fairlight >Hardware Engineering Manager >8977 9931 >j.kee...@fairlightesp.com.au ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
