| 摘要 |
PURPOSE: To optimize transfer delay of power supply by a thyristor with calculation of an approximate gate angle using a subroutine and calculating the fine amount of gate-angle adjustment with the other subroutines, immediately before the gating by the thyristor. CONSTITUTION: An added current value, outputted from an addition device 34 is electrically connected to a PI controller 40, and a gate ignition angle is calculated selectively, while being controlled by a program. The selection is performed with a sampling operation by a switch S2. Sampling operation is executed, while the switch S2 is in closed position and the PI controller 40 calculates the gate ignition angle of a thyristor to be ignited next. |
