Hi Everybody,
As you know, thyristor are a bistable switch and are unable to switch off once on, unless the external circuit forced the ANODE current to go down to zero.
I really wonder, what if, for example a thyristor is conducting 10A from anode to cathode, then my external gate circuit forced the cathode current to zero (by making the gate voltage go negative related to cathode, all the 10A flowing into the anode now flow out of the GATE, and none flow out of cathode) for some time higher than the commutated turn off time, then could the thyristor turn off? In short, is there any possible commutation mode of the thyristor, except making the anode current to go to zero?
If we consider the following equivalent circuit, then we can see it is possible
If all the current is taken from the NPN transistor by the gate circuit, then after some time it will recover and then we stop the gate current and the anode current too.
However, if we consider the real physical structure of the thyristor, then? Any master please help me out.
I added a picture to demonstrate what I mean
Simulation link: http://www.falstad.com/circuit/circ....4+0+2+11+3 o+14+1+0+4099+1280+25.6+1+2+14+3
Really long link, how to add spoiler?
Thanks in advance
As you know, thyristor are a bistable switch and are unable to switch off once on, unless the external circuit forced the ANODE current to go down to zero.
I really wonder, what if, for example a thyristor is conducting 10A from anode to cathode, then my external gate circuit forced the cathode current to zero (by making the gate voltage go negative related to cathode, all the 10A flowing into the anode now flow out of the GATE, and none flow out of cathode) for some time higher than the commutated turn off time, then could the thyristor turn off? In short, is there any possible commutation mode of the thyristor, except making the anode current to go to zero?
If we consider the following equivalent circuit, then we can see it is possible
If all the current is taken from the NPN transistor by the gate circuit, then after some time it will recover and then we stop the gate current and the anode current too.
However, if we consider the real physical structure of the thyristor, then? Any master please help me out.
I added a picture to demonstrate what I mean
Simulation link: http://www.falstad.com/circuit/circ....4+0+2+11+3 o+14+1+0+4099+1280+25.6+1+2+14+3
Really long link, how to add spoiler?
Thanks in advance