> I finished my HV PSU design and decided to share it as open-source hardware, > for anyone to use freely: > http://jan.rychter.com/high-voltage-power-supply-for-nixie-tube-projects
That's a nice bit of work, thank you for sharing it! I'll just offer one tip: when supporting multiple package variants and not wanting your schematic to look wonky, make a custom Eagle part that has a footprint with the package variants, and use that. A side advantage is that you don't have to try to overlap parts to get the arrangement you want, avoiding design rule check errors. > The supply generates up to 220V from a 12V input. In addition to that, it > also provides 2*Vout (so, up to 440V, for dekatrons), and two outputs for > powering digital logic: 5V and 3.3V. The primary HV boost circuit reaches 88% > efficiency when going from 12V to 185V at 55mA, with a 3% output ripple. Those are some useful parameters. That would also make a nice tube/CRT supply. The 5V output could be adjusted to 6.3V for heaters, and the doubler could be extended to a tripler (or more) for CRTs that want more voltage. The regulation, efficiency, and available current would all be less, but CRTs don't need much current. I really appreciate details like mounting holes! > The version I'm posting online is not perfect, but works quite well in a > number of my projects. I decided I'd rather publish it as it is now rather > than keep it locked forever. Good thinking. Now people can pick up where you left off and make their own improvements (and hopefully share them). > The design is based on the TPS40210 from Texas Instruments, as I've grown > tired of the MAX1771. I just couldn't get it to work reliably, didn't like > the pricing, didn't like the availability. Yeah, pretty much everything out there uses the 555, MAX1771, or MC34063. It's nice to see another approach! > Hope it helps someone, at least to understand boost converters better (I > certainly learned a lot while building this!). You mention some of the stuff you learned, and offer a nice writeup on CCM vs DCM, which I appreciate. I'd be intereseted if you care to share more details on loop stability or the parasitic ringing on the switching node and how to tame it with a snubber. Well done. John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/F3330D0A-E586-4B98-AB98-91D58C951134%40mac.com. For more options, visit https://groups.google.com/d/optout.
