LTSpice model for a SiC MOSFET

Ask a daft (or incompletely-specified) question and you must expect an answer that seems daft to you.

Does the word "hyperbole" mean anything to you Bill? A search engine should help. I don't mean (x^2)/(a^2)-(y^2)/(b^2)=1

Bill has informed you that you are stupid. Apologize and be more respectful in the future.

Of course it does. As a rhetorical device it's inappropriate in this context, as anybody but a pretentious clown would know.

It isn't remotely necessary. It's not a word I use often, but it is part of my active vocabulary.

Only a clown like you would confuse a mathematical function with a rhetorical device.

He's obviously unwell.

From my web-site, on the Baxandall resonant inverter.

"The circuit is probably best known from Jim Williams’ series of application notes for Linear Technology, on high frequency inverters for driving cold cathode back-lights used in laptop computers (application notes AN45, AN49, AN51, AN55, AN61, AN65). Jim Williams describes the inverter as a current driven Royer inverter, referring back to the non-resonant inverter described by Bright, Pittman and George H. Royer in 1954 in a paper “Transistors as on-off switches in saturable core circuits” in Electrical Manufacturing. AN65 does include a reference to Peter Baxandall, but to his 1960 paper “Transistor Sine-Wave LC Oscillators” in the British Journal of the IEEE paper number 2978E which is cited in a discussion of root-mean-square power measurements.

Not in lap-top computers.

The Baxandall circuit was tolerably well known in the UK, where Peter Baxandall was almost famous. I've heard a story about Jim Williams getting Linear Technology reps to ask about such circuits, which might explain how he got hold of the circuit without knowing where it came from. Baxandalls paper was published in the UK in a publication that Americans didn't read.

Yes I think you're right so I'm going to leave it there.

The amount of information you have to spell in your question does depend on the sophistication of the target audience. Spell out too much and you get responses from people who don't know enough to be helpful.

John Larkin can be relied to come up with something unhelpful. He does work hard on burnishing his image.

Their charter used to include "Don't be evil" but that was deleted. Evil turned out to be more profitable.

Anybody who doesn't admire John Larkin as much as he feels he deserves to be admired is obviously defective - from his point of view - and John Larkin does like to think that they are unwell.

My medical acquaintances don't share his point of view.

In the short run, which is all they know about.

Cheers

Phil Hobbs

I think I'll rely on my doctor. She's got a medical degree, and does seem to know what she is talking about.

John Larkin's advice does tend to be unhelpful.

To be fair, they haven't been around for all that long, and the world wide web has made all sorts of data much more easily available than it was twenty years ago, and changed some aspects of society fairly drastically.

Google started off with a better than usual search engine, and it's expansion was driven by the way that people used it. It would have been nice if the expansion could have been planned with some long term aim in mind, but innovation tends to go in unexpected directions, and innovators do tend to favour developments that make them more money - if they don't some other innovator fills the gap.

I heard it was "Don't be evil - that's *our* business".

Sorry -- it is on page 440 of the X-chapters, not AOE3.

The reverse Marx generator doesn't need to go all the way down to 3.3V it could just increase the current and reduce voltage to the point where a conventional converter (such as a flyback) can be used without excessive voltage devices being used.

The Baxandall inverter looks as if it would work with sufficiently high voltage MOSFET, which clearly exist, even if Infineon is being slow to offer a Spice model to let me simulate it.

It's a pretty simple circuit, even if the component parts look to be on the expensive side - coping with even 1kV costs money.

Roughly 1W dissipation per mA , so if the current requirement isn't too high, that is probably the most straightforward system with very little to go wrong.

That's a lot of extra complication for very little improvement, the resistor still has to carry the full load current.

For a cult market you could use an 807 and tap the 3.3v off the cathode bias resistor. (or better still, rectify the heater supply and use a linear regulator but don't tell the customer).

Maybe a simple self oscillating two transistor half bridge as in CFL ballasts of a few decades ago?