| 摘要 |
PURPOSE:To enhance the reliability and accuracy of a thyristor by separating the thyristor voltage and a gate voltage and monitoring them at the ground voltage side. CONSTITUTION:A voltage which is divided from a thyristor voltage is applied through a logic element 31 to a light emitting diode 7 during the period that the thyristor 1 conducts upon reception of a gate voltage GP. When a gate voltage GP is applied to the thyristor 1, the thyristor 1 is conducted, the gate voltage GP is applied through the element 31 to the diode 7. A light signal from the diode 7 is transmitted through a light transmission line 11 to a photoreceptor diode 12. The output of the diode 12 is inputted through an amplifier 13 to logic product elements 33, 34, which respectively produce outputs corresponding to the gate and thyristor voltages, which are applied to a gate signal monitor 36 and a photoreceptor 14. |
