| ??? 01/06/05 04:16 Read: times |
#84433 - More thought Responding to: ???'s previous message |
Dear Russell,
The critical time is the firing time - once it's triggered, it doesn't care if you keep on kicking it. Yes, you're right in case of DC voltage is applied to the SCRs. However, in my application the AC is applied and SCRs are used to rectify. The AC line is 60Hz, so I have to constanly monitor the phase, load current, detect zero crossing, filter out the noise on the line... etc. This is a Current regulation application . what is not so critical is when you stop sending pulses to the thyristor Again, in this case the load is inductor, and voltage is AC at 60Hz. Thus after rectifying the ripple will be 120Hz and the output voltage is not pure DC, so I have to take care of reverse current when I stop sending firing pulses out to SCRs, otherwise the SCRs, transformer have to handle alot of stress of reverse current. Plus if I don't, the reverse current in the inductive load will takes sometimes to decay; therefore, slow down the control (consider "dead time". I'm glad that you interested in my post. Please keep sharing. Have a good one. Regard, T.L |
| Topic | Author | Date |
| Optimizing ISR | 01/01/70 00:00 | |
| Delay loop inside ISR=no-no | 01/01/70 00:00 | |
| Delay in ISR | 01/01/70 00:00 | |
| re-sched ISR | 01/01/70 00:00 | |
| Timing ISR | 01/01/70 00:00 | |
| ISR | 01/01/70 00:00 | |
| More thoughts | 01/01/70 00:00 | |
| More thought | 01/01/70 00:00 | |
| how about a PCA | 01/01/70 00:00 | |
how about a PCA | 01/01/70 00:00 |