| 摘要 |
PURPOSE:To simplify the organization of a driving circuit, by feeding OFF-gate current and backward bias voltage to a GTO thyristor with a set of a DC power source and a switching element. CONSTITUTION:When a semiconductor switch 2 is closed at the time of zero hour, then the primary side current I1 and the secondary side current I2 of the I1 multiplied by (a), namely, the OFF-gate current of a GTO thyristor 7 get to flow to be increased, and after that, when the connection between the cathodes of the GTO thyristor 7 is counter-recovered, then the both current I1 and I2 get to be reduced. After that, the secondary side current I2 comes to zero, and the primary side current I1 comes to a constant value, and by the constant current, backward bias voltage is applied between the gate cathodes of the GTO thyristor 7. As the result, OFF-gate current and backward bias voltage can be fed through the same DC power source.
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