| 摘要 |
PURPOSE:To enhance the reliability and to lengthen the lifetime of a thyristor converter by monitoring the number of open defect light emitting elements or equivalently a current and a voltage. CONSTITUTION:The first light emitting elements 2, 2 are connected in series, and the second light emitting elements 3, 3 and nonlinear elements 4, 4 are connected in parallel with the elements 2, 2. An optical signal from the element 2 is normally used as a gate signal, and, when the first element 2 is open, an optical signal from the second element 3 is used as a gate signal. A monitoring circuit 16 is provided, thereby monitoring the number of open defect elements 2. |
