山形大学紀要(工学) 第11巻 第1号(1970)257-267

角形ヒステリシス磁心を用いたサイリスタ用
全波形点弧制御回路

尾山 茂




A Full-Wave Type Firing Circuit with Squre
Loop Cores for the Thyristor

Shigeru OYAMA

Author has reported on a firing circuit for the thyristor (SCR) amplifier of which the controlcharacteristic is not affected by the supply voltage variation. The firing circuit is composed of a saturable reactor and a magnetic amplifier. In case of half-wave type, good results are experimentally obtained. In case of full-wave type, however, the reset flux change is affected by the supply voltage variation when the resistance of control circuit of the magnetic amplifier is small. In order to prevent its effect, it is necessary to use a series or parallel compensating circuit in the control circuit.
This paper offers a new firing circuit of full-wave type. This circuit is composed of a saturable reactor and an auxiliary thyristor and is different from a usual circuit of full-wave type.
The circuit is simple in construction and smaller than the usual circuit of full-wave type, and it has a special merit that a pair elements with identical characteristics do not need to be prepared.
This paper describes the principle of performance and the criteria of circuit design, and shows the experimental results of the firing circuit designed according to the criteria. The appropriateness of the design is also discussed.



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