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payloadde 18th April 2012 07:54 PM

2nd Xfmr with Flyback Converter
I have a flyback converter with the following properties:

- input 230V off line
- output +15V (0.6A) / -12V (0.3A) / +200V (0.05A)
- actual power approx. 25W
- power capacity appr. 75W

Now I need an additional 200V (0.05A) output in the same box.

The catch:
it`s got to be completely isolated from the other HV output.

The question is:
- can I connect a second flyback xfmr in parallel to the existing xfmr`s primary ?

- there should be enough headroom concerning rectifier, switching Mosfet, prim.cap., etc

- regulation of the 2nd HV output necessary ? simple shunt reg. or none at all ? since load is pretty constant and not critical.

- any unpleasant surprises to be expected ?

payloadde 18th April 2012 08:24 PM

additional question:
- can I leave unused windings on a flyback converter open / unconnected ?
provided that the main ones are loaded and regulated ?

darkfenriz 21st April 2012 10:13 AM

Is that current mode or voltage mode converter?
The perfect solution would be to add just another HV secondary, which would not need any further regulation

payloadde 24th April 2012 12:06 AM

current mode
no way to add additional winding
just looking for a quick add-on solution w/o building a new xfmr
tried it anyway - no serious things happened other than the other secondary voltages dropped somewhat and the additional voltage didn't go over 90V which is only half of what I need.
I think that could have been expected ...

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