Making ferrite transformers for my 500V x 6MHz power supply?
Posted: Mon Oct 04, 2010 4:02 pm
{Not sure if this is for the RF, HV or digital forums!!}
I have built (a year or two ago) a high frequency PSU that can put out a few x100V square wave to a few MHz. It took me about 6 mths to research which components worked sufficiently well to actually do this, then another 9 to build it. Anyhow, I will put up all the details of it here quite soon when I start posting up, in earnest, some of the detail of the experimental work I've been up to.
Here is an example of the output, running ~400 V x 2 MHz into a load [25W bulbs]:
At this precise moment it is in a bit of a 're-fit', hence me asking this question now: The original intention was to run this PSU output on top of an up-to ~5kV DC potential. What I would ideally like is to have the flexibility to 'convert' this output into a bigger voltage output, but still square wave.
I have no knowledge of achieving such a feat of electronics but the way I see it is that if I feed this into a sufficiently sized ferrite core then as the current switches 'on' then the core will begin to magnetise and as it does so will generate a respective potential across the secondary for as long as the core is ramping up in saturation. Once switched off, the magnetic current will die off (how quick would it do that?!?) I'm looking for 1 to 3 MHz range so I guess it is likely not a big core that could accomplish this as there won't be that much energy actually flowing in each pulse [dunno, just guessing...].
Well, there it is. How do I 'transform' the output you see above into the same output waveform but with a higher peak voltage?
I have built (a year or two ago) a high frequency PSU that can put out a few x100V square wave to a few MHz. It took me about 6 mths to research which components worked sufficiently well to actually do this, then another 9 to build it. Anyhow, I will put up all the details of it here quite soon when I start posting up, in earnest, some of the detail of the experimental work I've been up to.
Here is an example of the output, running ~400 V x 2 MHz into a load [25W bulbs]:
At this precise moment it is in a bit of a 're-fit', hence me asking this question now: The original intention was to run this PSU output on top of an up-to ~5kV DC potential. What I would ideally like is to have the flexibility to 'convert' this output into a bigger voltage output, but still square wave.
I have no knowledge of achieving such a feat of electronics but the way I see it is that if I feed this into a sufficiently sized ferrite core then as the current switches 'on' then the core will begin to magnetise and as it does so will generate a respective potential across the secondary for as long as the core is ramping up in saturation. Once switched off, the magnetic current will die off (how quick would it do that?!?) I'm looking for 1 to 3 MHz range so I guess it is likely not a big core that could accomplish this as there won't be that much energy actually flowing in each pulse [dunno, just guessing...].
Well, there it is. How do I 'transform' the output you see above into the same output waveform but with a higher peak voltage?