New DC Hybrid Filter for Attenuating Low-Frequency Ripple of AC-DC Power Converter

Abstract

In this article, a new DC hybrid power filter is proposed to attenuate the low–frequency ripple of AC-DC power converter. The proposed DC hybrid power filter is connected between the DC bus of AC-DC power converter and the load, and it composes of a passive power filter and a single-arm power converter. The passive power filter can reduce the voltage rating of single-arm power converter, and the operation of single-arm power converter generates a virtual harmonic resistor connected to the load in series. The DC hybrid power filter can suppress the twice-utility-frequency ripple for eliminating the use of electrolytic capacitor. The salient feature is that the control circuit of the proposed DC hybrid power filter is simplified because only a feedforward control is used. A hardware prototype is developed to validate the performance of the proposed DC hybrid power filter. The experimental results are as expected.

Keywords:

• hybrid power filter
• AC-DC power converter
• electrolytic capacitor

Additional information

Funding

The authors express their gratitude to ABLEREX Electronics Co. Ltd. for its financial support for this article.

Notes on contributors

Jinn-Chang Wu

Jinn-Chang Wu received the M.S., and Ph.D. degrees from the Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan in 1992 and 2000, respectively. Presently, he is a professor in the Department of Microelectronic Engineering, National Kaohsiung University of Science and Technology. He is a Member of the IEEE. His fields of interest are power electronic applications.

Hurng-Liahng Jou

Hurng-Liahng Jou received the B.S. degree from the Department of Electrical Engineering, Chung Yuan University, Jonglih, Taiwan, in 1982, and he also received the M.S., and Ph.D. degrees from the Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan, in 1984 and 1991, respectively. He is currently a Professor in the Department of Electrical Engineering, National Kaohsiung University of Science and Technology. He is a Member of the IEEE. His major interests are power electronics applications and power quality improvement technique.

Tse-Yu Lin

Tse-Yu Lin received the B.S., and M.S., degrees from the Department of Microelectronic Engineering, National Kaohsiung University of Science and Technology. His fields of interest are power electronic applications.