please help me to find the best way to fire up SCR in this circuit, but without pulse transformer. Optoisolators can be used. Signal to turn on SCR will be from MCU.
Resistors represents internal resistance of generator and transformer.
please help me to find the best way to fire up SCR in this circuit, but without pulse transformer. Optoisolators can be used. Signal to turn on SCR will be from MCU.
Resistors represents internal resistance of generator and transformer.
You can always use an optocoupler (see attached drawing), but for this application you have to select one with Vceo>60V ..
Here are some examples (4pin DIP): TLP521, TLP621, CNY17, ILD615 ..
Regards,
IanP
Pulse transformers used in firing thyristors is usually 1:1 turn ratio. Is it necessary to use high voltage (60V) to trigger thyristor? I use +24VDC on primary and it works well. You just need a power of only about 2.5-3V@300mA at G-K to do the job.
Best regards,
Kieennx.