PELS 1997 Prize Paper Awards

Input Filter Design for Multiple-Module DC Power Systems

Martin Florez-Lizarraga was born in Nogales Sonora, Mexico. He obtained the B.S. degree in electrical and computer engineering in 1986 and the M.S. degree in ECE in 1991, both from the University of Arizona. He is currently a Product Development Engineer at International Power Systems, a division of C&D Corporation.

Arthur F. Witulski obtained the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Colorado, Boulder, in 1981, 1986, and 1988, respectively. He has worked as a Design Engineer and Product Engineer at a major manufacturer in the area of power supply design for large magnetic data storage subsystems. He is currently an Associate Professor at the University of Arizona in the Department of Electrical and Computer Engineering.

Abstract: When multiple dc/dc converters are operated from a dc bus with a nonzero source impedance, undesirable interactions can occur between an individual regulator and the input impedance of the other regulators on the bus. Consequently, criteria for input filter design in the presence of a significant source impedance are developed, which, when used in conjunction with already-known input filter criteria, permit the input filter to be designed so that each regulator operates reliably. Proper filter design tends to decouple the negative regulator impedances from the bus, leaving only the passive input filter impedances to affect the other converters. These filter impedances appear in parallel with the source impedance and reduce the overall source impedance. Hence the use of multiple modules on the same bus actually improves the performance of the individual regulators. An example, the buck current mode controlled converter, is examined in detail. Extensive experimental evidence is presented to verify the analytical results.

Nonlinear-Carrier Control for High-Power-Factor Boost Rectifier

Dragana Maksimovic was born in Belgrade, Yugoslavia, on July 15, 1961. He received the B.S. and M.S. degrees in electrical engineering from the University of Belgrade, Yugoslavia, and the Ph.D. degree from the California Institute of Technology, Pasadena, in 1984, 1986, and 1989, respectively. From 1989 to 1992, he was with the University of Belgrade, Yugoslavia. Since 1992, he has been an Assistant Professor in the Department of Electrical and Computer Engineering at the University of Colorado, Boulder.

Yungtaek Jang was born in Seoul, Korea. He received the B.S. degree from Yonsei University, Seoul, Korea, in 1982, and the M.S. and Ph.D. degrees from the University of Colorado, Boulder, in 1991 and 1995, respectively, all in electrical engineering. From 1982 to 1988, he was a Design Engineer at Hyundai Engineering Co., Seoul. Since 1995, he has been a Research Engineer at Advanced Energy Industries Inc. in Fort Collins, CO.

Robert W. Erickson was born in Santa Monica, CA, on August 3, 1956. He received the B.S., M.S., and Ph.D. degrees from the California Institute of Technology in 1978, 1980, and 1983, respectively. He is presently an Associate Professor in the Department of Electrical and Computer Engineering at the University of Colorado, Boulder.

Abstract: Novel nonlinear-carrier (NLC) controllers are proposed for high-power-factor boost rectifiers. In the NLC controllers, the switch duty ratio is determined by comparing a signal derived from the main switch current with a periodic, nonlinear carrier waveform. As a result, the average input current follows the input line voltage. The technique is suitable for boost converters operating in the continuous conduction mode. Input voltage sensing, the error amplifier in the current-shaping loop, and the multiplier/divider circuitry in the voltage feedback loop are eliminated. The current-shaping is based on switch (as opposed to inductor) current sensing. The NLC controllers offer comparable or improved performance over existing schemes, and are well suited for simple integrated-circuit implementation. Experimental verification on a 240 W rectifier is described.

Fu-Yuan Shih was born in Taipei, Taiwan, in 1968. He received the B.S. degree from Tamkang University, Tamsui, Taiwan, and the M.S. degree from National Taiwan University, Taipei, Taiwan, in 1990 and 1992, respectively, both in electrical engineering. He is currently working toward the Ph.D. degree at National Taiwan University.

Dan Y. Chen received the B.S. degree from National Chiao-Tung University, Taiwan, and the Ph.D. degree from Duke University, Durham, NC, both in electrical engineering, in 1969 and 1975, respectively. From 1975 to 1979 he was employed as a member of the research staff at the General Electrical Research and Development Center, Schenectady, NY. Since 1979 he was been on the faculty of the Department of Electrical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, where he is Professor.

Yan-Pei Wu was born in Tainan, Taiwan, in 1932. He received the B.S. degree in electrical engineering from National Taiwan University, the M.S. degree in electronic engineering from National Chiao-Tang University, Shin-Chu, Taiwan, and the Ph.D. degree in electrical engineering from the University of Washington, Seattle, in 1955, 1960, and 1973, respectively. From 1957 to 1961, he was an Engineer with the Telecommunication Organization, Taiwan. In 1962 he joined the faculty of the Department of Electrical Engineering, National Taiwan University, where he is Professor.

Yie-Tone Chen was born in Taiwan in 1965. He received the B.S., M.S., and Ph.D. degrees in electrical engineering from National Taiwan University, Taipei. In 1993 he joined the faculty of the Department of Electrical Engineering. National Yunlin Institute of Technology, where he is now Associate Professor.

Abstract: Abstract: A procedure for designing ac line EMI filters is presented. This procedure is based on the analysis of conducted EMI problems and the use of a noise separator. Design examples are given, and results are experimentally verified.