,But It's not protected from output sparks.
what is the exact source and nature of the output sparks?
This is the usual H-bridge circuit.Why did you place a reverse diode across the gate resistor will it not make your turn turn OFF very fast ? It will increase your dv/dt substantially and reduce the short circuit
withstanding capacity.
Yes,of course.Filter consists of 3.3uH + 2.2 uF as datasheet.Does your setup include the output filter shown in the "original circuit"?
I think You are right.So I placed bidirectional 350V TVS at h-bridge output and maybe it suppress TV and solve problem but I don't test it in practice.voltage transient brought up by discharging the output filter capacitor.
I don't think so.Please tell me that does placing zener diode for high side mosfets't gate cause a problem?
Results in about 60 kHz cut-off frequency, makes no sense. 3.3 uH means that output shorts cause very fast MOSFET current rise, little chance for overcurrent protections to act before the transistors are damaged.Filter consists of 3.3uH + 2.2 uF as datasheet.
The small core suggests an inductor without air gap, saturated at higher output current and thus not limiting di/dt during short circuit.I made 3.3mH with 33*29 EI ferrite.
Fuse is far too slow to protect gate driver.This circuit employ fuse and zener(Maybe it could be called FD circuit!) to protect LO and HO pin of driver.
Actually fuse does not protect mosfet.Fuse is far too slow to protect gate driver.
What is the designed output power level (at the input and also at the output)? The inductor at the output is apparently not doing its job.
Is it possible to reduce the capacitor value at the output? - just a wild guess!!
I see those voktage peaks as the main problem that kill your Mosfets..
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