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Ripple compensation of a single-phase rectifier by two-quadrant chopper and auxiliary capacitor |
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| Authors: | Hisaichi Irie Nobuyuki Takemoto Takeshi Yamashita |
| Affiliation: | 1. Osaka Electro-Communication University
Hisaichi Irie joined Sharp Co. after graduating from Osaka Prefectural University in March 1960. He also has a Dr. of Eng. degree. He joined Osaka Prefectural University as an Assistant in 1964 and was promoted to Associate Professor. He moved to Osaka Electro-Communication University in 1990 as a full Professor. He is interested in the semiconducting power converter circuit and motor drive. He is a member of the Society of Instrumentation and Automatic Control Engineers of Japan;2. Power Electronics Research Association;3. and IEEE.;4. Osaka Electro-Communication University Nobuyuki Takemoto was appointed an Assistant at Osaka Electro-Communication University after obtaining a Bachelor's degree from there in March 1967. He was promoted to Lecturer in 1976. He is interested in power electronics and motor drive and control. He is a member of Japan Robotics Society;5. Japan ME Society;6. Institute of System Control and Information;7. and Power Electronics Research Association.;8. Hankyu Railway Co. Takeshi Yamashita joined Hankyu Railway Co. after obtaining a Master's degree from Osaka Prefectural University in March 1990. |
| Abstract: | The single-phase converter or rectifier always has a voltage ripple in the output dc voltage because the instantaneous power of the single-phase ac line varies on the double frequency of the line. To obtain a smooth dc voltage, an energy-storing element is necessary. The smoothing capacitor is used to reduce the ripple voltage in the dc output. Usually, it has much larger capacitance than that needed to absorb the ripple energy. This paper discusses the required capacitance to absorb the ripple energy, and represents a ripple-compensation circuit with a small auxiliary capacitor controlled by a 2-quadrant chopper connected in parallel to the smoothing capacitor. The appended capacitor works under large ripple voltage and efficiently absorbs the ripple energy. The ripple-compensation circuit works as an equivalent capacitor with a large capacitance. |
| Keywords: | Two-quadrant chopper voltage integral control method single-phase rectifier smoothing capacitor |