| 摘要 |
PURPOSE:To accurately control without shortening the interval time of controlling in a time division manner by applying a firing pulse at the nearest firing time to the calculated firing phase angle, and correcting the firing angle to be calculated next with the error value. CONSTITUTION:After an AC voltage zero is detected when the firing of a control rectifier 1 is controlled by a microprocessor in a time division control system, a current value is detected by a current transformer 6 and the firing position angle of the rectifier 1 is calculated by a deviation from a current setter 5. When the firing pulse is applied to the rectifier 1 by selecting the nearest firing time to the firing phase angle, the error value between the time when the firing pulse is actually applied and the calculated value of the firing phase angle before one is stored, the calculated value is corrected by the error value, and the firing pulse is output at the nearest firing time to the corrected firing phase angle calculated value. |
