My .02cents on this thread:
Jason, we are all electronics hobbyists to various degrees and we all
love to show off our latest projects in this group. Firstly, don't be
discouraged on that count.
However, like very few things in this world, this group is nearly
unilaterally biased towards using the TaylorEdge supplies. This is
because they have very high output power, very low minimum voltage
requirements, are physically very small, and are very cheap. Most people
seem to perceive this as a "solved problem".. Myself personally, I've
never used one of his supplies.. and have only once used an off the
shelf nixie supply, so I'm not your target customer. The point I'm
rambling towards is that this seems to be a classic case of designing a
solution for a need that doesn't seem to exist. Engineers fall into this
trap literally _all the time_, and it really is one of the first rules
of engineering: talk to the customer first and let the customer define
the requirements. Designing a switching supply is a great exercise, one
that I heartily encourage. Far too many people are content to just buy
something off the shelf instead of learning how to do it themselves.
Hats off to you for designing your own switching supply, but I fear that
you have indeed created a solution for a non-problem.
-Adam
On 4/5/2011 12:21 PM, jason greskoviak wrote:
Michael,
You are correct. i have my enable going to a mpsa42 that is providing
ground to a mpsa92. the hv output goes through the a92. I am using an
IPD60R380C6 650v mosfet with a Id of 30A and a 100uH inductor. past
that i have a RS1GFS Diode and 2 .47uf 400 volt caps in parallel. The
voltage input is the only downside. I can't go down to 2v.
Jason
On Apr 5, 1:40 pm, "M.J.Sangster"<[email protected]> wrote:
I'm guessing he's using the 34063 for regulation, perhaps the HV
transistors are cutting the output voltage? Jason?
I use a 34063 circuit on my Nixie clocks, and get anywhere from 60-82%
efficiency depending on component selection. The max output would
depend on rating of the inductor, hv capacitor, switching Mosfet, and
trace sizes. I find the 34063 makes a good solid hv power supply.
I do need a 2 - 4v input capability for some of my upcoming projects,
and I know the 34063 can't do it. I will use the Taylor supplies for
those designs.
- Michael Sangster
www.coldwarcreations.com
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