Re: Active Power Factor Correction
In a message dated 98-11-30 12:58:20 EST, plaw...@west.net writes: Hello Colleagues, I have recently learned of a technology whereby harmonic disturbances may be reduced via APFC (Active Power Factor Correction). This is apparently a device that injects cancellation harmonics back onto the line under closed loop control. Is anyone able to point me to any resources where I can learn more? Hi, active power factor correction has several guises. The two I'm familier with are where a pre-switcher is used, and where active circuits null harmonics at the point where power enters to box. For Technique 1, I suggest you go to the Linear Tech site, they have devices specifically for this, I believe Cherry do too. I'm playing with a LT 1509CN at the moment, it's quite good. For Technique 2, the work I did was to reduce the weight in aircraft solid state power convertors back in 1986. It was never made commercially available, though I believe a company from Israel called Actil has a filter based on this concept. They are at www.actil.com. Best regards. Derek Walton. Owner L F Research EMC Design and Test Facility. NARTE Engineer 438. - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Active Power Factor Correction
This actually not an add on device but a caracteristic design in the front end of a power supply. If you can get a copy of some hold (2-4 years) Unitrode seminar handbook or Unitrode application notes for their ICs you will get some basic information about these. Also Microlinear web site is providing some info on the subject. -Original Message- From: POWELL, DOUG [SMTP:doug.pow...@aei.com] Sent: Wednesday, November 18, 1998 1:55 PM To: EMC-PSTC (E-mail) Subject: Active Power Factor Correction Hello Colleagues, I have recently learned of a technology whereby harmonic disturbances may be reduced via APFC (Active Power Factor Correction). This is apparently a device that injects cancellation harmonics back onto the line under closed loop control. Is anyone able to point me to any resources where I can learn more? === Doug Powell, Compliance Engineer Advanced Energy Industries, Inc. 1625 Sharp Point Drive m/s 2018 Fort Collins, Colorado 80525 USA Phone:970-407-6410 eFax: 970-407-5410 email:doug.pow...@aei.com (new address) === - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Active Power Factor Correction
Hi Doug. I have recently learned of a technology whereby harmonic disturbances may be reduced via APFC (Active Power Factor Correction). This is apparently a device that injects cancellation harmonics back onto the line under closed loop control. Is anyone able to point me to any resources where I can learn more? The ERA in Leatherhead, UK, was doing a lot of work with this stuf, and had a product. Tel:+44 (0) 1372 367030 Fax: +44 (0) 1372 374074 Email: i...@era.co.uk Sorry. I don't recall the chap running the group. Chris Dupres Surrey, UK. - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Active Power Factor Correction
Hi Doug: Active (as opposed to passive) power factor correction for electronic products is a high-frequency switching rectifier (ahead of the switching-mode power supply) which stores energy in an inductor rather than in a capacitor. The current waveform is in phase with the voltage waveform and is nearly sinusoidal (better than 95%). Therefore, the power factor is better than 0.9, and the harmonic currents are nearly zero. It does not inject cancellation harmonics back into the power line. I'm not sure if this is an answer to your inquiry. I've not heard of an APFC that is generic and corrects for any load. However, I have heard of a zig-zag transformer (for installations) that dissipates the harmonic current and effectively corrects harmonic-caused poor power factor. Best regards, Rich - Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 619 655 3329 16399 West Bernardo Drive FAX : +1 619 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com - - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Active Power Factor Correction
http://www.microlinear.com http://www.microlinear.com/toc.shtml : Table of content -Original Message- From: Sparacino,George [SMTP:sparaci...@andovercontrols.com] Sent: Thursday, November 19, 1998 1:11 PM To: Daniel Sicard; EMC-PSTC (E-mail) Subject: RE: Active Power Factor Correction Dan, do you have the web address for microlinear ? Thanks, George -Original Message- From: Daniel Sicard [SMTP:dsic...@positronfiber.com] Sent: Wednesday, November 18, 1998 9:12 PM To: EMC-PSTC (E-mail) Subject:RE: Active Power Factor Correction This actually not an add on device but a caracteristic design in the front end of a power supply. If you can get a copy of some hold (2-4 years) Unitrode seminar handbook or Unitrode application notes for their ICs you will get some basic information about these. Also Microlinear web site is providing some info on the subject. -Original Message- From: POWELL, DOUG [SMTP:doug.pow...@aei.com] Sent: Wednesday, November 18, 1998 1:55 PM To: EMC-PSTC (E-mail) Subject: Active Power Factor Correction Hello Colleagues, I have recently learned of a technology whereby harmonic disturbances may be reduced via APFC (Active Power Factor Correction). This is apparently a device that injects cancellation harmonics back onto the line under closed loop control. Is anyone able to point me to any resources where I can learn more? === Doug Powell, Compliance Engineer Advanced Energy Industries, Inc. 1625 Sharp Point Drive m/s 2018 Fort Collins, Colorado 80525 USA Phone:970-407-6410 eFax: 970-407-5410 email:doug.pow...@aei.com (new address) === - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Active Power Factor Correction
Hello Colleagues, I have recently learned of a technology whereby harmonic disturbances may be reduced via APFC (Active Power Factor Correction). This is apparently a device that injects cancellation harmonics back onto the line under closed loop control. Is anyone able to point me to any resources where I can learn more? === Doug Powell, Compliance Engineer Advanced Energy Industries, Inc. 1625 Sharp Point Drive m/s 2018 Fort Collins, Colorado 80525 USA Phone: 970-407-6410 eFax: 970-407-5410 email: doug.pow...@aei.com (new address) === - 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
