| 摘要 |
PURPOSE:To prevent a malfunction due to the external noises, by using an optical fiber to a part of a transmission line which is close to a power converter to be controlled. CONSTITUTION:The control signal sent from a control board 1 which transmits a control signal from a remote place is sent to an electrooptic signal converting circuit 3 via a transmission line 2. The control signal converted into an optical signal by the circuit 3 is sent to an optical-electric signal converting circuit 5 via an optical fiber 4 having length of <=1/10 transmission line 2 to be converted into an electric signal and then controls a power converter 6 to be controlled. According to this invention, the effect of external noises is sufficiently reduced to ensure the stable control by using an optical fiber to the transmission line which is set immediately before the converter 6. |
