Active power factor correction provides an added benefit of a wide range "universal" input for voltage and for frequency. Ralph McDiarmid, AScT Xantrex Technology Inc.
________________________________ From: [email protected] [mailto:[email protected]] Sent: Mon 5/25/2009 7:28 PM To: Ralph McDiarmid; [email protected]; BrianKunde Subject: RE: 120V mains voltage distortion I vaguely recall something about early switcher power supplies and the need for power factor control - PFC, in the '80's and the requirement was supposed to be out of Japan. They were putting in LOTS of computers by thousands in big office buildings that were supplied by few (one?) big transformer. The current pulses were full of harmonics and the results were not interesting to the facilities folks that handled those transformers, because they owned those transformers, not the power company. Spangler, "A Power Factor Corrected, MOSFET Multiple Output, Flyback Switching Supply", PCI, Oct. 1985 Proceedings, pp. 19-32 Barabas, "Simplified Control Algorithm for Active Power <http://www.patentstorm.us/patents/5134355.html#> Factor Correction", PCI, Oct. 1985 Proceedings, pp. 1-9 Hadley, "Power Factor Correction Using a Preregulating Boost Converter <http://www.patentstorm.us/patents/5134355.html#> ", PCI, Oct. 1988 Proceedings, pp. 94-100 "Advance Information ML4812 Power Factor Controller", Micro Linear, Jun. 1989 Sum, "Power Factor and its Effect on Power Quality", Power Conversion, Oct. 1989, Proceedings, pp. 74-87 Nalbant and Klein, "Design of a 1 KW Power Factor Correction Circuit", Power Conversion, Oct. 1989, Proceedings, pp. 121-134 Mammano and Neidorff, "Improving Input Power Factor-a New Active Controller Simplifies the Task", Power Conversion, Oct. 1989, Proceedings, pp. 100-109 Neufield, "Control IC for Near Unity Power Factor in SMPS", Power Conversion,! Oct. 1989, Proceedings, pp. 110-119 Herfurth, "Application Note: TDA 4814-Integrated Circuit for Sinusoidal Line Current Consumption", Siemens Components Mar., 1986, pp. 103-107 Dixon, "High Power Factor Preregulators for Off-Line Power Supplies", High Power Factor Preregulators, Unitrode Corporation <http://www.patentstorm.us/patents/5134355.html#> , Dec. 1990 - Bill Indecision may or may not be the problem. --- On Fri, 5/22/09, Kunde, Brian <[email protected]> wrote: From: Kunde, Brian <[email protected]> Subject: RE: 120V mains voltage distortion To: "Ralph McDiarmid" <[email protected]>, [email protected] Date: Friday, May 22, 2009, 1:22 PM I believe it was spearheaded by the utility companies so they did not have to spend the money to adapt to the changing power needs of technology. -----Original Message----- From: [email protected] <http://us.mc0 g.mail.yahoo.com/mc/[email protected]> [mailto:[email protected] <http://us.mc01g.mail.yahoo.com/mc/[email protected]> ] On Behalf Of Ralph McDiarmid Sent: Friday, May 22, 2009 1:16 PM To: [email protected] <http:/ us.mc01g.mail.yahoo.com/mc/[email protected]> Subject: RE: 120V mains voltage distortion Why did the members of the EU decide that harmonic currents needed to be controlled for appliances? I can see doing so might reduce the need to oversize the low-voltage distribution infrastructure to accommodate the increase in Apparent Power demand. Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc -----Original Message----- From: [email protected] <http://us.mc0 g.mail.yahoo.com/mc/[email protected]> [mailto:[email protected] <http://us.mc01g.mail.yahoo.com/mc/[email protected]> ] On Behalf Of John Woodgate Sent: Friday, May 22, 2009 5:03 AM To: [email protected] <http:/ us.mc01g.mail.yahoo.com/mc/[email protected]> Subject: Re: 120V mains voltage distortion In message <275330ee7cbb894ab8775ffdee4bc85b3d10695...@na-exmsg-c118.redmond.corp.mi <http://us.mc01g.mail.yahoo.com/mc/comp se?to=275330EE7CBB894AB8775FFDEE4BC85B3 [email protected]> crosoft.com>, dated Thu, 21 May 2009, Ted Eckert <[email protected] <http://us.m 01g.mail.yahoo.com/mc/[email protected]> > writes: >Distortion may not be just on the 120 V lines. I previously worked in >a building where the variable frequency drives (VFDs) for the >building?s cooling system were causing significant distortion on the >277/480 V lines. There was enough distortion that it carried through >to the 120/208 V system through the step-down transformers. The result >was that even on the lower voltage system, two of the three phases >showed flat topped sine waves. But the US sees no need to control harmonic currents to the extent given in IEC/EN 61000-3-2. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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