Apparently these power supplies are hard to find. I may be slightly off the track here but we designed some a couple of years ago (up to 1000 Watts) using Microlinear Power Factor Regulator Chip ML 4812. It featured a boost buck configuration. We got efficiencies of up to 88 % using powdered iron (not ferrite chokes) material (we had 5% loss in boost and 5% lost in buck).
The boost segment corrects the power factor in that it forces the ac line current to track the supply voltage. The buck section is your normal regulator. Our power factor was almost 1 and THD was down to less than 2%. But, they were mainly intended for bulk fluorescent lighting application where the PFC/THD requirements are very stringent. In the lighting industry you couldn't sell something with a THD of say 90% and a Power Factor of 0.3 (I mean the plain Rectifier/ Electrolytic Capacitor/ Switching regulator types). And we did not have to do any fancy design, just followed the Application Note at the back of the Catalogue. Thermals were a bit of a problem though. Microlinear have (and this goes back to 1992) some prototyping kits too. Regards Arun Kaore EMC Engineer ADI Limited Systems Group Test & Evaluation Centre Forrester Road, St Marys NSW 2760 P O Box: 315, St Marys NSW 1790 Tel: 61 2 9673 8375 Fax: 61 2 9673 8321 Email: kao...@sg.adi-limited.com.au <mailto:kao...@sg.adi-limited.com.au> -----Original Message----- From: John Radomski [SMTP:john_radom...@inter-tel.com] <mailto:[SMTP:john_radom...@inter-tel.com]> Sent: Tuesday, August 17, 1999 12:34 PM To: emc-p...@majordomo.ieee.org <mailto:emc-p...@majordomo.ieee.org> Subject: PC Power Supply w/ PFC We are looking for a supplier of 300 Watt PS2, PC power supplies that have PFC (Power Correction Factor). Here is the spec: It must comply with: EN 60950 (safety approval required), EN 50082-1, EN 61000-3-2/3, CISPR 22 (or EN 55022). REQUIRED RATED INPUT: 220-240VAC, 50-60Hz, 3.5A (auto ranging power supplies with input ratings from 100VAC, are accepted) OUTPUT: +5VDC 30A; -5VDC 0.5A; +12VDC 12A; -12VDC 0.5A John Radomski Compliance Engineer Inter-Tel Integrated Systems, Chandler, Arizona, USA john_radom...@inter-tel.com <mailto:john_radom...@inter-tel.com> --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org <mailto:majord...@ieee.org> with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com <mailto:ed.pr...@cubic.com> , jim_bac...@monarch.com <mailto:jim_bac...@monarch.com> , ri...@sdd.hp.com <mailto:ri...@sdd.hp.com> , or roger.volgst...@compaq.com <mailto:roger.volgst...@compaq.com> (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org <mailto:majord...@ieee.org> with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com <mailto:ed.pr...@cubic.com> , jim_bac...@monarch.com <mailto:jim_bac...@monarch.com> , ri...@sdd.hp.com <mailto:ri...@sdd.hp.com> , or roger.volgst...@compaq.com <mailto:roger.volgst...@compaq.com> (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
