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《Journal of North China University of Technology》 1988-02
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A Study of Voltage Type Current Converter

Wang Yonglin(Department of Engineering)  
In this system an advanced inductance energy storage inverter with auxiliary SCR for current switching-over is used. This inverter is suitable for frequency converters with wide adjustable frequency range and large or medium power, Its characteristics are: small circular current, high switching-over efficiency and good load adaptability The key problem of SCR frequency converter is current switching- over. This paper has analyzed and discussed exhaustively the switch- ing-over process in the main circuit of the inverter. The energy stored in the switching capacitor is restored for next switching instead of being lost or fedback to the power source. Three-phase fully-controlled bridge circuit and capacitor filter are used in the main rectifier. If the D.C current goes beyond a given limit, the firing angle will shift back rapidly and the rectifier will turn into an inverter, so over-current protection and short circuit protection are achieved.
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1 Wang Yonglin (Department of Engineering);ON SWITCH-OVER OF INVERTERS[J];Journal of North China University of Technology;1990-03
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