Soft switching AC/DC/AC converter with current freewheeling circuit

Author

Woo, Byeong O. ; Cho, Gyu H.

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

fYear

1991

fDate

24-27 Jun 1991

Firstpage

31

Lastpage

38

Abstract

The modified DC-link (MDCL) converter generating sinusoidal output voltage solved the drawbacks of soft switching converters, such as high voltage stresses of devices and/or many device counts. However, it also has problems such as the high peak device current and a wide variation of switching cycle interval. An improved soft-switching AC/DC/AC converter based on a high-frequency link is proposed to solve these problems. By introducing a current freewheeling circuit, it separates the main power flow from the resonating circuit during the commutation interval. As a result, the peak current is limited to around the link current and the switching cycle interval is controllable. Furthermore, the VA ratings of the devices are considerably reduced. Therefore, this converter combines the desired features of the MDCL converter with its improvements

Keywords

power convertors; switching; VA ratings; commutation interval; current freewheeling circuit; link current; modified DC-link convertor; peak current; resonating circuit; sinusoidal output voltage; soft-switching AC/DC/AC converter; switching cycle interval; Analog-digital conversion; Circuit topology; Pulse width modulation inverters; Resonance; Stress; Switches; Switching circuits; Switching converters; Switching frequency; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1991. PESC '91 Record., 22nd Annual IEEE

Conference_Location

Cambridge, MA

Print_ISBN

0-7803-0090-4

Type

conf

DOI

10.1109/PESC.1991.162648

Filename

162648