| ??? 11/25/04 16:25 Read: times |
#81945 - It is for power control. Responding to: ???'s previous message |
Dear Oleg,
Thanks for your post, may I ask - what is the task you do it for? Are you really need with voltage regulator (I doubt that because your code does not provide it as it is), or do you need just with power regilator? In last case you need not with control these angles. Just fire thyristor for some periods and do not do it in rest ones. For example, take 100 periods as full regulator cycle and then shitch thyristor on for 70 periods and off for 30 ones. It gives you 70% of power over a load. Oleg, The application is basically resistance welding control, In this case the thyristor is fired at appropriate angles to get desired welding current. Thus it is a sort of power control. The thyristor is not continuously fired. It depends upon application welding can last from 1 half cycle to several thousand cycles. The main concern in this application is very precise and symmetrical firing of both half cycles, if firing is assymetrical it causes cummulative transformer saturation. Thanks & Regards, Prahlad Purohit. |
