I read in !emc-pstc that Robert Wilson <[email protected]> wrote (in <3FF57405336C9B4C976A1819F860A2560F698D@xng_tirsys.TIRSYS.COM>) about 'Power Factor regulations.', on Tue, 30 Apr 2002:
>We will be starting the design of a relatively simple, off-line >switchmode power supply that will be used to power an LED Luminaire (for >lighting up the outside of buildings). A power supply will be used to >drive each of the 3 colours independently (for dynamic colour changing). >It will be designed for universal 120/230 Volt input, with an adjustable >20 to 28 Volt DC output. Power output will be 40 Watts maximum. As >mentioned, 3 of these power supplies will be used in each Luminaire. > >My question is: what (if any) power factor requirements are we required >to meet, both for North America and for the EU. My first thought was >that there are no specific power factor requirements since ordinary >computer power supplies have no PFC correction whatsoever (at least not >the ones normally available here in North America). But I recall a year >or two ago, a conversation with Jim Eichner (one of the inhabitants of >this group) where he mentioned there were impending EU power factor >requirements. > >Can anyone shed any light on what PF requirements exist at this power >level? Although it could be argued otherwise, your product is 'lighting equipment' in the context of IEC/EN61000-3-2, and the Class C limits apply. You have a choice at present of using the 1995 edition of the EN with all its amendments OR the 2000 edition. The differences in respect of Class C are subtle, so choose carefully. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
