Input: 500VDC - 2,000VDC Output: 12VDC isolated to 5KV rating (50-100watts) Looking for sources of this type of product. Can be open frame, or fully sealed and enclosed. Prefer North American companies only (USA/CANADA). ~Thanks!
Terry schrieb:
Hello,
12 V DC output is no problem, 5 kV isolaton voltage is possible, 50 to 100 W output is also possible.But 500VDC - 2,000VDC input really is a problem for converters build with transistors and ICs, with 80 to 350 VDC it would be possible. Up to
570 V DC might be possible too.Bye
You are looking at a custom design. You are still within the realm of Flyback at 100watts. Perhaps a high voltage Igbt or 3 1500v mosfets in series would do the job. I'm sure there are a few clever engineers here that could get the job done.
regards, Bob
A similar issue was discussed just a month or two ago how to design power supplies with input voltage about 1 kV DC. Look through the googlegroups archive, there might be some pointer to readily available boxes.
You might also find suitable products from companies supplying the electric train, tram or trolley bus industry. Of course, these products are not cheap, since they are designed for the corresponding standards and quite small production volumes.
It's not that hard but there is no demand so it isn't done. Unless you have a need for huge volume then it will be very expensive.
Flyback is out of the question because of the high voltage pulse due to the leakage inductance.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Depends on what is considered expensive. A couple of thousand $ should get the OP somewhere.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Of course not. Who said a flyback has to have leakage inductance?
Hint: isolation.
In fact, that requirement 100w, 500V-2kV to 12V and 5kV isolation is pretty easy.
If the OP don't find anything of the shelf he can contact me.
-- Thanks, Fred.
AFAIK every transformer has a bit of leakage inductance which will kick a HV pulse back into the switch. This is wat limits the use of the flyback topology.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Not if he needs to get approvals it wont or if he needs to properly test it.
"Nico Coesel" a écrit dans le message de news: snipped-for-privacy@news.kpn.nl...
Of course, but who said you need a transformer?
-- Thanks, Fred.
How many do you need? It would probably have to be a custom design.
John
Is there a battery or some energy on the 12V output side to get it going or does it have to start up from the high input voltage ??
Could maybe use a vacuum toob I suppose rather than a semiconductor switch.
Maybe these guys have done this, but they are usually going from low v input to high v as the output.
boB
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