Hi, are you sure that you do not need any R in serie with D2 and D3?
If you do not put any R, the turn off current can be very high to damage the internal driver circuit.
D2 and D3 are used to have two separated dynamics for turn-on and turn-off. However, in this case the turn-off dynamic is very very fast yielding also switch overvoltage when current flows.
I'm looking at Q1. Does its source terminal have a definite path to ground? Are you certain it turns on and off fully? Are you certain that it does not turn on unintentionally caused by very low voltage at node 2?
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Also, are your ground icons connected together?
I took a loot to the driver data-sheet. You cannot avoid to place a resistor in serie to D1 and D2. Driver can be damaged.
First of all, I would place a R, same value as the turn-on resistor.
2nd) place a load between the mid-point and DC-minus
Test the system and let me know.
Cheers
I took a loot to the driver data-sheet. You cannot avoid to place a resistor in serie to D1 and D2. Driver can be damaged.
First of all, I would place a R, same value as the turn-on resistor.
place a load between the mid-point and DC-minus
I made some changes and now the circuit is this: View attachment 126417
and the result output o osciloscope is: View attachment 126418
The output should be V+ and V- alternating, but isn't....
I connect all grounds , i think that Q1 isn't working
Ground is not necessarily meant to be the same point for all sections. Your righthand ground is now the node between the positive and negative supply. However this produces a short circuit.
It is important to create compatible ground references for each section. A section needs a definite ground reference for each signal going out from it. Trace the signals from your control section (this appears to be U1), and make sure each outgoing signal has a return path back to the control section.
Trace the current through your power section, and make sure each mosfet receives bias at correct volt level, at the same time its drain and source terminals are also at correct voltage. The schematic may look correct, but the volt levels may be unpredictable as the hardware is operating in a real circuit.
I was thinking, that maybe is the IGBT module that are crashed, how i can confirm if this is fine or not?
also it is very helpful to buffer the o/p of the 2110 when driving large devices...
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