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

Winfield Hill wrote:

> Sven Wilhelmsson wrote...
>>
>> Winfield Hill wrote:
>>
>>> Now I'm challenged with a creating a moderately-precise (5%),
>>> programmable, fairly-fast 10kV ramp, of 1 to 50us in duration.
>>> It's floating on 3kV. The 1us-long, 3kV to 13kV ramp spec is
>>> tough, but may have a relaxed 5%-precision spec, provided it's
>>> repeatable. :-)
>>
>> I did a similar thing a few years ago, however softer specs.
>> My approach was a stack of transformers driven in parallell
>> by mosfet power transistors.
>> The transformers were made of toroid ferrite cores. Wound by
>> hand with about 300 (at secondary) turns each.
>> What about doing it with ten of them and 500 turns each ;-)
>
> I've designed and made lots of fast high-voltage transformers
> over the years, and this is a possibility. But one serious
> problem is high-voltage transformers with good insulation tend
> to have high leakage inductance, which could kill my ability to
> create an accurate ramp waveform. So I'm not considering that
> approach seriously right now. But thanks for the suggestion.
>

Thats exactly why I used a _stack_ of toroid ferrites.
Each of them does not need internal HV-insulation, and toroids have low
leakage inductance. The primary can be an insulated rod through all the
toroids. Thats the HV-insulation.
But, as indicated above, the cost of handwork can be high.
/Sven



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