Power converter apparatus
AssigneeHitachi, Ltd.
InventorsSeiya Shima, Hiroaki Kuroha, Takeki Ando, Toshiaki Kurosawa, Hiromi Inaba, Yoshio Sakai
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Abstract
A power converter for power conversion between an a.c. system and a d.c. system includes a full-wave bridge circuit having GTO connected in at least one arm of the full-wave bridge circuit on the positive polarity side. During a conduction-enabled period of GTO which is determined by a firing phase angle, the GTO is so controlled as to perform current chopping operation by a pulse signal of a predetermined pulse width.
Claims15
A power converter apparatus for effecting power conversion between an a.c. system and a d.c. system by using a full-wave bridge circuit in which at least one arm is provided with controllable switch means capable of performing a current breaking function, comprising:
- phase angle control means for controlling phase angle of said switch means;
- pulse width control means for controlling width of pulse which causes said switch means to perform current chopping operation;
- and
- gate signal generating means for turning on and off said switch means with said chopping pulse of the controlled pulse width during a conduction-enabled period determined at least by said phase angle.
A power converter apparatus according to claim 13, wherein said full-wave bridge circuit is constituted by a three-phase full-wave bridge circuit, said gate signal generating means being adapted to turn on and off said switch means at a frequency which is at least six times as high as that of said a.c. system.
Dependencies are inferred from the claim text.