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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Flybacks certainly work, they are the circuit of choice for flash capacitor charging for a reason ... low noise though they are not, and with a HV transformer they aren't going to be terribly efficient either in their standard single switch form with RCD snubber (too much leakage induction).
Also I don't see why the rectifiers would care about the negative voltage swing on the output ... they simply go into conduction and the secondary inductor takes the negative voltage (which will generate bugger all current on the timescale of the discharge, it's huge compared to the load). The bigger problem I see is the primary switch, if you use a MOSFET you don't want it's parasitic diode to get pulled into conduction due to transformer action (which would make the secondary induction drop like a brick). So either use an IGBT without an anti-parallel diode which can reverse block, or add a series diode (more losses).
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
I think I'm going to play around with the flyback design for now.
As for the transformer to use, I have a high voltage board for the back light of an LCD monitor. It has 12 small flyback looking transformers. Is flyback the topology used on these type of transformer? Could I put a few in series to increase the total voltage output without doing any damage? Thanks!
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Best regulation for 5.5kV power supply
