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Registered Member #57473
Joined: Sat Oct 03 2015, 03:21PM
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Posts: 11
Hey I have built SSTC: - NE555 interrupter - 74HC14 with antenna - TC4452/TC4451 MOSFET drivers - GDT - IRFP460 halfbridge (10 ohm gate resistor)
I didn't started it with mains 230V power because I'm not sure if MOSFETs are correctly driven. Driver schematic: Power section schematic:
And here is how the gate drive waveforms looks like when connected to 50V power supply (I've tried also 30 and 70 and they are similiar):
The SSTC is working but it is not okay according to: My question is: is my gate driving waveform correct (and now, how to improve it)? I havent tried connecting my SSTC to mains because I don't have much MOSFETs and I don't want to blow them.
Without scale information it's hard to tell but they don't look bad at all. No intense ringing, no major linear region forays or nonsense other than -maybe- a slightly slow rise time. You could try reducing the gate resistor value, as the higher the frequency of drive the more current is required to charge/discharge the gates quickly enough. It certainly doesn't look bad though.
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Strange gate drive waveform in my SSTC?
