Re: Win's next 10kV project, a 1us ramp

On 7 Jan 2006 10:16:12 -0800, Winfield Hill
<Winfield_member@xxxxxxxxxxx> wrote:

>Robert Baer wrote...
>>
>> I think i suggested a flyback transformer.
>> Adjusting the supply voltage on the inductor (primary) can
>> adjust the slope / slew rate; maybe to 1% without too much
>> trouble and the amplitude can be controlled by the gated
>> time - again (perhaps) within 1%. One can easily have
>> multiple kV insulation between primary and secondary (ies).
>> And multiple drivers are not that big of a deal either.
>
> I like the constant-current into a capacitive load that a
> flyback coil / transformer can deliver. If the transformer
> has a 10:1 step-up ratio I could use 1kV MOSFETs to switch
> 5 to 10A on the primary... But I keep worrying about the
> transformer's leakage inductance. If the secondary + load
> was say 60pF total, then that'd have to be less than 17uH
> for a say 5MHz bandwidth. Hmm, 17uH doesn't look so hard.

A coax transmission-line transformer is easy to make and has pretty
much zero leakage. I'd just be concerned about getting enough core to
support your longer sweeps without saturating. Sometimes people drive
the core the other way before or after each shot to demagnetize (or
reverse magnetize) it and double the available volt-amps.

Hey, could you drive your electrode with a really high voltage sine
wave and use the sorta linear middle region? Synchronize your particle
beam shots (or whatever you're doing) with the sines. That would be a
simple resonant hv oscillator, dead simple.

Or use the first swing of a damped sinewave?

John



.

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