grizedale
Advanced Member level 3
godfreyl..........
Though FvM has said that the diode (if used at all) should be across R1, not where i've put it in the immediately above thread.
Where do you think the diode would be best put?...........
By the way, i do not know of a reason to include C6, so im leaving it out.
...All i am interested in is getting a decent trigger pulse and not overvoltaging any components due to broken inductive current
FvM
...so are you saying that the SCR can be turned off when the current is negative in it?
..I would have thought the reverse recovery time in an SCR was enormous?
BT168G is an SCR
**broken link removed**
...Page 5 of the datasheet says it takes 100us to turn off
In the actual circuit , we are using a thyristor, and the trigger circuitry stopped working after about 3 minutes, and i noticed that the resistor that connects up to the rail (R1) was a virtual open circuit.
....i then rep[laced this resistor, replaced the thyristor, replaced the trigger transformer, and put a diode from the trigger transformer up to the rail, and its worked ok since then.
My only worry, as i said, is that the trigger transformer had been sabotaged by our contractors......i am not sure......
..
Though FvM has said that the diode (if used at all) should be across R1, not where i've put it in the immediately above thread.
Where do you think the diode would be best put?...........
By the way, i do not know of a reason to include C6, so im leaving it out.
...All i am interested in is getting a decent trigger pulse and not overvoltaging any components due to broken inductive current
FvM
...so are you saying that the SCR can be turned off when the current is negative in it?
..I would have thought the reverse recovery time in an SCR was enormous?
BT168G is an SCR
**broken link removed**
...Page 5 of the datasheet says it takes 100us to turn off
In the actual circuit , we are using a thyristor, and the trigger circuitry stopped working after about 3 minutes, and i noticed that the resistor that connects up to the rail (R1) was a virtual open circuit.
....i then rep[laced this resistor, replaced the thyristor, replaced the trigger transformer, and put a diode from the trigger transformer up to the rail, and its worked ok since then.
My only worry, as i said, is that the trigger transformer had been sabotaged by our contractors......i am not sure......
Last edited:
