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Registered Member #2539
Joined: Sat Dec 12 2009, 07:51PM
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Posts: 4
Is it feasible to connect the rectified output of multiple flybacks in series for higher voltages/currents (versus a single ac flyback with voltage multiplier & associated losses)? Assuming the usual precautions for HV insulation/separation, etc.. In this application, the flybacks are identical designs, and the primaries are driven from a single source to assure that the transformers are switched in-phase.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Posts: 1546
Would the DC from one be outputted as + and the other as - , with the low sides connected together? Sometimes the rectifier sticks in TV flybacks is imbedded with the tranny poting.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Unlikely as I'd expect the secondary at the higher voltage to flash-over, the eht terminal is designed for eht, the other end isn't (look at the space from eht return to other pins - surface tracking)
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
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Posts: 374
you'll have to immerse the transformer in epoxy resin and evacuate the pot to remove the air. before doing so, build a decoupling transformer (e.g. break a toroid core in two halves, put them into a silicone tube and close the ring again using a cable tie. use 0.6mm-1.0mm wire and leave >1cm insulation path. I hope this will work with silicone, otherwise just use polystyrol or PMMA for insulation. You're doing this to be able to tie the negative HV winding terminal to one of the primary tabs.
Otherwise it may work but some of my transformers failed after some time due to internal breakdown to the other windings or the core itself
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
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Posts: 1039
I have put 3 flybacks in series, and also done 3 flybacks in parallel. all 3 where the same exact model flyback, and i never had any problems with it...I only used a 555 and single mosfet driver, so i didnt get the best of it, but it still made 5" arcs... For series i did as you'd expect. HV output to bottom of flyback, and so forth. My flybacks never had any arc issues even at the bottom, so i didnt use any oil or epoxy. However, some of my other flyback models did arc, as they were designed crappy. (30kv ones) and the ones that DIDNT arc over, are 45KV.
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DC Output Flybacks in Series
