| 摘要 |
PROBLEM TO BE SOLVED: To automatically adjust the other trigger timing to the optimum timing depending on one trigger condition, when a couple of switching means having self-holding function are connected to provide a problem (for example, a power supply being terminated) if these are turned on at the some time. SOLUTION: When a DC power supply 1 terminated in thyristors 2, 3, for example, are simultaneously turned on, 'a current detecting means 4 for outputting a current detection signal by detecting the main current of thyristor 2', 'a trigger means 5 for operating on the basis of the current detecting signal to output a trigger signal to the thyristor 3 when the main current becomes lower than a predetermined value', an on/off detecting means (transistor 6 or the like) for the on/off detecting signal by detecting on/off condition of the thyristor 2' are operated based on such an on/off detecting signal. Moreover, 'a trigger signal input rejecting means (transistor 6 or the like) for rejecting input of trigger signal to the thyristor 3 while the thyristor 2 is on' is also provided. |
