| 摘要 |
A switching circuit whose current-to-voltage characteristic across a first terminal and a second terminal is a bidirectional and symmetrical breakdown characteristic, and arranged especially so that said breakdown voltage will vary in accordance with the variation of voltage applied to a controlling terminal. Said switching circuit, in case it is used as a trigger circuit for controlling the firing angle of a bidirectional thyristor, unfailingly performs actuation of the bidirectional thyristor without being much affected by such factors as the fluctuations of the power supply frequency and the power supply voltage.
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