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So I've made an isolated EDM power supply, consisting of a boost converter to get the 100v-360v ionizing pulse, and a buck converter to get the 30v-80v working voltage. The pulse widths can be set from about 10us to 80us or more. Anyway I'm on revision 2, trying to get all three major parts on the same microcontroller (boost, buck, ouput control), partly to solve some noise issues using individually tracked micros talking over a 3 wire protocol. Who would have guessed a spark gap, and a bang-bang buck converter would create a noisy environment? So I'm kind of tired of STM32F1 and 8 bit AVRs. The STM32F103 can definitely handle the task but is kind of a bitch to get USB serial working with baremetal and I hate the vendor libs, but if there was a micro that had a decently cheap dev board and maybe some unicorn horn that would be awesome.

So I've made an isolated EDM power supply, consisting of a boost converter to get the 100v-360v ionizing pulse, and a buck converter to get the 30v-80v working voltage. The pulse widths can be set from about 10us to 80us or more. Anyway I'm on revision 2, trying to get all three major parts on the same microcontroller (boost, buck, ouput control), partly to solve some noise issues using individually tracked micros talking over a 3 wire protocol. Who would have guessed a spark gap, and a bang-bang buck converter would create a noisy environment? So I'm kind of tired of STM32F1 and 8 bit AVRs. The STM32F103 can definitely handle the task but is kind of a bitch to get USB serial working with baremetal and I hate the vendor libs, but if there was a micro that had a decently cheap dev board and maybe some unicorn horn that would be awesome.

(post is archived)

[–] [deleted] • 3 pts

The only thingI can say is "you're dealing with pretty complicated shit there, man".

Good luck, keep us informed.

[–] • 2 pts

You need some smoothing caps.

[–] • 0 pt

That's true. Do you know where to get some low ESR, high ripple capable, and cheap caps? I'm tempted to try making my own when faced with Digikey pricing.

[–] • 1 pt

It is really hard to find good caps these days, even from a single company in the same batch you can see +/- 50uf variance and added or decreased ripple. It has gotten to the point where I test them on a multimeter before I put them in the euro drawer where they go and about 1/3 get binned.