"Digital Control of Power Factor Corrected Power Supply" Olin Lathrop, Embed Inc http://www.embedinc.com/pfc/ This paper discusses new approaches to controlling power factor correcting switching power supplies, made possible by the availability of low cost 16 bit microcontrollers with substantially more processing power than the previous generation. Replacing analog control electronics with digital processing power allows for wholly new control schemes not possible before. The main focus of this paper is applying such techniques to power factor correction. It will be shown that feedback of the current is not required with the availability of divide and square root operations. Examples will be shown using a Microchip dsPIC 30F2010 microcontroller. Details of this particular implementation will be presented. This paper assumes you are familiar with electronics and have a basic understanding of switching power supplies, although a brief introduction to power factor correction is provided. ___________ Classic 20 page Power factor Correction paper. Detailed discussion of all aspects including the design of an IC to implement PFC. Old but amongst the best available papers for those wanting an good look at PFC principles. Unitrode Application Note U134 - UC3854 Controlled Power Factor Correction Circuit Design http://www.ti.com/lit/an/slua144/slua144.pdf This Application Note describes the concepts and design of a boost preregulator for power factor correction. This note covers the important specifications for power factor correction, the boost power circuit design and the UC3854 integrated circuit which controls the converter. A complete design procedure is given which includes the tradeoffs necessary in the process. This design procedure is directly applicable to the UC3854A/B as well as the UC3854. The recommendations in Unitrode Design Note DN-39 cover other areas of the circuit and, while not discussed here, must be considered in any design. This application note supersedes Application Note U- 125 "Power Factor Correction With the UC3854. _____________ Older: From: RussellMc Date: 8 November 2011 01:30 Subject: Fwd: [EE]:: Application Notes To: "Microcontroller discussion list - Public." SWITCHMODE=99 Power Supply Reference Manual ON Semiconductor Superb. ON Semiconductor SMPSRM/D Rev. 1, Sept-1999 _______________ Designing with the TL431. Excellent Means to use the capabilities of the TL431 to the full. Far more detailed explanations than are usually given. http://switchingpowermagazine.com/downloads/15%20Designing%20with%20the%20T= L431.pdf _______________________________________ November 2nd 2011 Some of these may require free registration. TI Motor solutions guide 17 pages 2H 2011 http://electronicdesign.com/portals/0/pdf/TI_MotorSolutionsGuide_oct2011.pd= f TI Analog Signal Chain Guide 137 pages Hours of fascinating reading, for some. 1Q 2011 http://electronicdesign.com/Portals/0/TI_AnalogSignalChainGuide_2011.pdf TI Audio Guide 44 pages http://electronicdesign.com/Portals/0/TI_Wp_AudioGuide_Aug2011.pdf --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .