Thanks.Here is the isolation.
I don't like the circuit.
1)R1, 1k turns off IGBT2. But it will not pull to ground. It stops working at the turn on voltage of LED2. (1.5 volts)
2)MCU1 probably can not pull up hard on IO13. It can pull down better.
3)ISO & Q1 = Darlington which is not known for speed. It turns off slowly! What is the PWM frequency?
4)Why not use a Schottky diode for IGBT1?
View attachment 240052
Just as a side note the "picture" is a schematic or drawing and Q1 is a BJT NPN Transistor and not a triode. The BJT Transistor is a solid state device and a triode vacuum tube or valve is not. Terminology is sort of important.The picture attached shown a IGBT driver circuit got online, which used a 6N136, drive a Triode and then drive the IGBT.
If the Controller and Controlled parts share the same power supply, you cannot get Isolation in spite of the Opto coupler.Hi,
The picture attached shown a IGBT driver circuit got online, which used a 6N136, drive a Triode and then drive the IGBT.
It is clear that the circuit used common ground, my question is can the circuit achieve isolation somehow? and how to modify it better?
View attachment 240047
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by Jake Hertz