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I am no expert but wouldn't a ferrite core without an air-gap saturate and cause things to go pop.
If you are referring to the gdt that depends on how much power is pumped in to it you may be able to use a smaller version with smaller mosfets but it sounds interesting it would in theory stop the fets from latching up at high current and exploding but don't take my word for it
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Interesting replies, thanks.
I realise it would have to run in a manner that doesn't saturate the core, but that's fairly easy to overcome.
I also realise it would present problems with any kind of feedback to adjust or control frequency, which some of the TC bridge circuits seem to contain.
I was thinking about it from a point of view of having no IC's to worry about.
I had thought about using an astable multivibrator, but then this occurred to me.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
This contraption actually worked at ~200 kHz driving a Tesla coil, the output from the coil was very bad though, possibly because of insufficient coupling. But the waveforms were as they should be.
I guess you could get it to work well at "flyback" frequencies.
PS. Driving gates with sine wave from the "zvs" circuit output isn't really good.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dr. Dark Current wrote ...
This contraption actually worked at ~200 kHz driving a Tesla coil, the output from the coil was very bad though, possibly because of insufficient coupling. But the waveforms were as they should be.
I guess you could get it to work well at "flyback" frequencies.
This was the first idea I had, but then I thought it might be simpler to use the ZVS circuit as a GDT driver.
Dr. Dark Current wrote ...
PS. Driving gates with sine wave from the "zvs" circuit output isn't really good.
Are there not ways of 'shaping' the sine wave output to approxomate a square wave? or is this impossible with the Mazilli circuit?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You can make the ferroresonant version of the ZVS, using an ungapped core and omitting the resonant capacitor and DC link choke. That gives you a square wave from the outset. I've seen an iron-cored version of this used to generate gate drive at 60Hz for a power inverter.
The easiest way of getting gate drive is using a TL494 and a couple of gate driver chips.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Steve Conner wrote ...
You can make the ferroresonant version of the ZVS, using an ungapped core and omitting the resonant capacitor and DC link choke. That gives you a square wave from the outset. I've seen an iron-cored version of this used to generate gate drive at 60Hz for a power inverter.
I rather suspected ferro-resonance would be the solution to this. I don't suppose you have a link to a schematic, Steve?
The circuit that Dr DC linked to looks looks something else though, don't you think?
Steve Conner wrote ...
The easiest way of getting gate drive is using a TL494 and a couple of gate driver chips.
The circuit that Dr DC linked to looks looks something else though, don't you think?
I will probably get some TL494's though, but that ZVS fuul bridge schematic is a work of art, no IC's at all.
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Stupid idea, or feasible? Full Bridge Mazilli ZVS
