EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Yansi on April 21, 2022, 10:51:58 pm
-
Hello,
for a project I need a 1kV regulated DC supply, that could deliver at least 5mA, better 10mA output current. For good repeatability of results, I would like to avoid winding diy transformers, so was looking into an option of repurposing a common CFL tube inverter transformers.
These do have specs quite similar as to what I need, as the secondary voltage is usually specified in the range of like 1000 - 2000Vrms, so 1000Vdc after a rectifier would be definitely no problem. Power-wise, these transformers seems to also fit, as they usually are rated in the range of like 6 - 15W or sort of.
However, I am having trouble finding a source of these transformers, where I could get a transformer including a full datasheet. (currently not in a mood of reverse engineering random Aliexpress transformers).
How many pcs do I need? Say 10-20, likely not more.
The only such transformer available in stock I could find with a spec sheet is this SGE2685-1G from Microsemi (or made for Microsemi? Datasheet attached[attachurl=1]), which seems to be a spare for a LMT3210 TV set. These are available on Aliexpress. But just 7W, I would like to see bit more than that.
Any ideas, where to look for these transformers, where one could locate a specsheet for them? Found some listed on Digikey (Coiltronics CTX410809-R), however 0 stock, deprecated, not manufactured. Or what other options of transformer to repurpose do I have for this task?
Thanks for ideas.
Y
-
A simple flyback transformer would do the job, especially in that power range. CFL transformers are semiresonant and tend to be specifically to match the characteristics of the tube they are driving.
-
CCFL inverters are more easily available in module form (https://mouser.com/c/optoelectronics/backlighting-components/el-ccfl-inverters-accessories/?function=CCFL%20Inverter). Also a lot of people have used them in the past for kV range power supplies.
Of course CFL inverters are easily available from CFL ;)
-
That part seems rather small, with the #46 wire. Voltage should be about right.
How about multipliers, could use a say 20W flyback in reverse? 12V in, 240V out, quadrupled or so.
Tim