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Hello goldsmith,
i tried with the simple circuit below to experiment with the GTO thyristor BT-157 , to be able to see its triggering characteristics before going any further..
.
I have tried 2 ways to turn it on/off both failed..
First way
i used 2 PIC16F871 microcontrollers, one was...
Hello,
Its been sometime now that i am trying to figure out an efficient way to turn on and off a GTO thyristor but i cannot find a solution,
i ve searched the net a lot but i couldnt find any information regarding the triggering of a GTO.
I know that it requires a positive pulse to its gate...
Thank you all for your replies,
I have tried and added 3 capacitors in parallel of 4,7μf (biggest i found in market) so i would say that the problem is elsewhere..
From what you people said here and watching how my circuit reacts it seems that indeed the problem has to be with the GATE...
Godfreyl,
I have tried also with the resistors as in the picture you proposed but the result was the same.. SCR's fail to turn OFF when their respective SCR turns ON.
Any other ideas would be appreciated
Hello FvM,
I trigger the thyristors using PIC1f871.. After i saw that the result was not what i should expect,
i tried triggering first SCR1 and SCR4 .. i remove the pulses and thyristors SCR1 and SCR4 stay on as expected.
then i send pulses to SCR2 and SCR3 and it seems the circuit short...
Godfreyl,
after i looked more closely your solution i failed to understand why this would help..
Can you explain how it should work please?
The thyristors should TURN OFF while the capacitors discharge .. If i put the resistors there dont i cancel out the job of diodes in the topology ?
Hello,
am trying to implement the topology below to invert from dc to ac..i am using thyristors to do that,but it seems i am not getting the results that i should.
when i trigger SCR1 and SCR4 respectivily everything seems fine , capacitors are being charged with the correct polarity
Also when...
So trying to make a dc to ac three phase inverter using GTO's was a bad choice for my final year project .. I already spent so much time to learn how thyristors work and i will end up using IGBT's :¬.
Having so high currents and also be able to produce negative and positive pulses is a bit...
After experimenting a bit(I am a University student) with BT157 fast gate turn off thyristor i found out that i could turn the thyristor on
with around 45mA at the gate. But after the pulse is removed the thyristor will turn off instanteniously..
I read about Latching current and i understand...
Hello i have been trying to find a GTO thyristor with a sensitive gate but i couldnt find any..
The lowest(that i found) latching current that the gate needs to operate as a GTO thyristor was 0.75A, otherwise below latching level
the device behaves like a transistor with a gain dependent on...
Is it possible to make PIC16F88 work on lower DC level?
Meaning on the ground Reference having -5V and for positive supply 0V?
If yes how should i connect it to achieve that?
Thank you
I am gonna try this ..
Any more ideas? Using op-amp in inverting mode will not make it work ? By my small experience it doesn't but i could be doing something wrong..
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