LTSpice model for a SiC MOSFET

I've been posting here for more than twenty years. So has John Larkin. It isn't an environment where gracious responses count for much.

The transistor was invented in the 1950's. Decades ago is closer to the mark. And if I can buy a 1.7kV SiC MOSFET, why would I bother to stack two transistors?

Sure. John Larkin can't be bothered to design special purpose transformers, or get then made, but you want to remind us that that it is still an option.

The classic Baxandall transformer usually has two base drive windings. You tend to need a coil former with lots of pins for its transformer.

That started me wondering how long I have been posting here. I checked back and my first <sci.electronic.design> post was 20 years and 4 months ago.

The usual Baxandall circuit does generate a peak voltage that's 1.67 times the supply voltage. Non-resonant switchers tend to generate switching spikes that go even higher.

I've played with them at the design stage from time to time. I've never been all that happy with what they've offered.

Here is Baxandall's original paper - I put a copy on my website more than ten years ago.

I'm fairly sure that power source is on the small side. Safe limiting is unlikely to be an issue.

It's a more complicated circuit than John Larkin likes to play with.

It's got a special purpose transformer, the feed inductor and two switching transistors. In theory you have to add a capacitor across the transformer to create the resonant tank, but for the application I'm talking about it may be difficult to wind the transformer with a low enough parallel capacitance to get the sort of resonant frequency I'd like to see.

That's not a lot of components.

It's not the sort of component that a search engine will find for you.

A manufacturer and a part number would be helpful.

So post an LTSpice simulation - an .asc file rather than some screen shot. That way we can run the simulation for long enough to see that it really does settle down, rather than just looking okay at some point during start-up.

That's a lot of words but doesn't describe anything that takes a small direct current at high voltage and turns it into larger current at a low voltage.

"connected to a rectifier system" does suggest that you can envisage rectifier system that might do the trick but what is being asked for is its dual, an inverter system.

Of course you can. LTSpice was designed for less sophisticated users

Search engines aren't a challenge. I've been using them since they were invented. Giving them right character string to find the result I need can be a challenge.

LOL sane people would have known what I meant without needing to point that out Bill. In any case there was no transistor capable of doing horizontal deflection and EHT for a 20 or more inch CRT before the late 60s. My Father was never without a spare PL36.

The Art of Engineering #3 (I think) - describes a "Reverse Marx Generator" that does exactly that (charging caps in series and discharging in parallel). It uses diodes as the switching element.

It doesn't matter how complex your circuits are, since they will never be built.

Sane people don't say "centuries" when they mean "decades".

So what.

You do like to think that. The last time that I went to the trouble and expense of getting something built, it let us find another low-level noise source which made it useless in the intended application.

I can afford that kind of minor extravagance, but I do try to avoid it.

The forward diode drop is inconsequential at 1kV, but inconvenient at

I've got AOE3. It's index doesn't point to any "reverse Marx generator". Google search throws up links, but nothing useful.

The classic Marx generator uses spark gaps as its switches. I have used them myself (to start a xenon arc lamp), but they wouldn't be useful here.

The original post didn't say that it was a direct current source. My comment "Depending on supply frequency and required output current." would have given you a clue that I was assuming an A.C. source.

I don't see anything 'saved' before 2004, here.

Wasn't there some kind of bleed-over into Google Groups?

RL

I have an archive on my machine going back to about 2000, when I first started using Usenet. Google was just a useful new search engine at that time, not the ubiquitous, intrusive, data-devouring monster it has since grown into.

Ran across similar circuits, used to power CCFL lamps on canal boats and caravans in the UK, off 6V and 12V accumulators.

In NA, they tended to go straight for a 120VAC inverter buss and COTS hardware.

RL

Google groups copied everything and retained it, until the spam started flooding in. The old stuff is still available there, and I just found an old post of mine dated 1996-08-27