| 摘要 |
PURPOSE:To prevent an abnormal phenomenon by applying a delay time suitable for a clock signalto on-and-off signals of a control side, in case of bringing an AC power source to zero crossing control by using a thyristor, etc., and also to execute faithfully a command from a control part. CONSTITUTION:The first on-signal 7 of a pattern signal synchronizes with a clock signal 10 which a control part 5 is oscillating by a frequency of about two times of an AC power source 1, independently from the AC power source 1 in its inside, but the subsequent on-signal 8 is delayed by a T' time from the clock signal concerned and outputted to a gate input 6 of a zero crossing ignition equipment 2. Also, as for the next on-signal, the clock signal is delayed by a 2T' time. By adopting this system, when a switching time point of on and off signals outputted by the control part 5 has synchronized with a zero crossing ignition time of the zero crossing ignition equipment 2 somewhere, even if a mis- ignition of a mis-cutoff is generated once, the mis-ignition or the mis-cutoff is not generated continuously unless the frequeny of the AC power source 1 is varied extremely in one period of its sampling. |
