Digital Control Of Switching Power Supply - Power Factor Correction Stage.pdf

文档介绍：Digital Control of Switching Power Supply
- Power Factor Correction Stage

Sangsun Kim and Dr. P. Enjeti

Power Electronics and Power Quality Laboratory
Department of Electrical Engineering
Texas A&M University
College Station, TX – 77843-3128
Tel: [phone]
Fax: [phone]
Email: ******@

Abstract: Industry standard for the control of switch mode power supply (SMPS) systems has been
analog control. Now with the advent of high speed, lower cost digital signal processing (DSP) ICs,
digital control there has been an increased interest in digital control of SMPS. The Power
Electronics & Power Quality Laboratory of Texas A&M University is currently exploring several
implementation aspects of digital control of power factor correction (PFC) stage of SMPS. Two low
cost digital controllers: TMS320LF2407 and ST52x420 are evaluated for implementing PFC
function. Simulation and experimental results are shown to demonstrate PFC control of SMPS to
meet IEC 1000-3 harmonic limits.


I. Introduction
Worldwide, the markets of internal and external switch mode ac/dc power supply (SMPS) have
been growing at a faster rate for several applications such munications, computers,
instrumentation, Industrial controls, and military/aerospace area [1, 2]. According to resent
estimates, the world wide SMPS market share for power supplies (puter, cellular
phone, modem, and munication equipment) is expected to increase from about $20 billion
in 2000 to $56 billion by 2005, for pound annual growth rate %. The majority of the
present day SMPS employ analog control and are undergoing slow evolution. On the other hand,
enabling technologies such as digital signal processors (DSP), integrated semiconductors,
ics, improved ponents, and cooling technologies are fast evolving. Tomorrow’s
SMPS is expected to be highly efficient, with near unity power factor, DSP control, 10W per cubic
inch, and 400+A in t