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My name's Paul and this is my first post on these forums. I'm a DIY electronics hobbyist (mostly audio stuff and guitar effects). I have some experience with HV circuits (made a few flyback drivers, nothing fancy) and got my interest piqued by SSTC's lately.
As most electronics shops close to me don't have any gate driver IC's available I decided to make do with logic and transistors and did this quickie dirty schematic and would like a second opinion. (Yes I took some 'inspiration' in previous work by many posters of these forums, wealth of information here!) I tried to use least amount of parts that is possible and came up with a full bridge GDT driver that uses: 4 transistors, 1 hex Schmitt inverter, 1 quad NAND and 1 D flip-flop.
The schematic:
What the simulator says it is doing: Blue trace is 'feedback', red trace is 'enable' (from interrupter), green trace is current through R1 'simulating' the GDT primary.
I think that I need to add some short autostart pulse from enable input too, so it then feedbacks and self-sustains. And possibly the bridge should use logic level mosfets so it has full voltage swing instead of just being push-pull emitter followers.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Paul Very good BUT Normal gate drive circuits include adjustable dead time ie time when neither output is active. This is done because it takes time for big FETs and IGBTs to stop conducting. If one fet is still conducting during turn off when the other in the bridge is turned on you have shoot through which tends to let the smoke out of your output devices
Paul Very good BUT Normal gate drive circuits include adjustable dead time ie time when neither output is active. This is done because it takes time for big FETs and IGBTs to stop conducting. If one fet is still conducting during turn off when the other in the bridge is turned on you have shoot through which tends to let the smoke out of your output devices
Well I didn't take that into account, ain't no power electronics buff. This complicates matters, simplest idea I have would be a XOR gate and RC high-pass. Like this:
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[First Post] Question about a SSTC driver
