| 摘要 |
PURPOSE:To obtain a stable DC current by correcting the displacement of a firing phase angle due to the impedance of a converting transformer by a firing angle correcting circuit. CONSTITUTION:The voltage signal of a synchronous power source obtained from a 3-phase AC power source 1 via a PT2 is inputted to a firing angle correcting circuit 9. ON the other hand, the phase of the voltage signal obtained by the PT2 is corrected in response to the current signal obtained by CT8 by the correcting circuit 9 by considering the impedance of a converting transformer 3, and inputted to a phase controller 6. Thus, high control accuracy can be obtained, and stable DC current can be obtained. |
