Hi, 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
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. I designed it because I couldn't find anything that would make sense for my Nixie projects. There are plenty of tiny power supply modules available on eBay, but most of them end up being impractical: no 3.3V (for my microcontroller) and 5V (for my 74141 nixie drivers), no mounting holes, no >400V output for powering dekatrons. Some supplies make a token gesture towards practicality by sticking a 7805 on the same board, but you quickly find out that the current draw of 6x74141 is enough to require a large heat sink on a 12V-powered 7805 (one 74141 consumes 12.5mA!). This means that instead of a single-board power supply you end up routing your input power all over the place, implementing your power supply in several places. 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. 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. Hope it helps someone, at least to understand boost converters better (I certainly learned a lot while building this!). --J. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/57C4EEA4-A8CA-4FEF-9F69-877A7B0739B4%40gmail.com. For more options, visit https://groups.google.com/d/optout.
