直流リアクトルのない電流共振形DCリンクAC/ACコンバータ

抄録

High frequency resonant link converters which utilize soft-switching have been focused for the purpose of downsizing or high efficiency to drive AC power machinery. Such resonant link AC/AC converters are classified to four types, that is, whether they act in voltage resonant mode or current resonant mode, and whether they include DC link or AC link. Current resonant converter has the features that the system utilizes natural commutating devices such as thyristors and does not need electrolytic capacitor for DC link.
In this paper, we propose a new DC link circuit without DC bias inductor adding a thyristor to DC link converter. This circuit has many advantages. Because of no DC inductance, it is small-sized and light-weighted and there is no possibility of abrupt releasing of DC inductor energy by commutation failure.
Further the operating characteristics are explained and the criterion of sustained resonance and the determination of circuit parameters are derived. And applying these result to the experiment, output characteristics are attained.