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4hv.org :: Forums :: High Voltage
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Single Op Amp Resonant Flyback Driver

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anuragbakshi
Fri Feb 25 2011, 12:11AM Print
anuragbakshi Registered Member #3707 Joined: Tue Feb 22 2011, 02:54PM
Location:
Posts: 5
I have recently fond while experimenting a very simple way to drive a flyback using resonance.

WARNING: The windings have to be in phase (wound the same direction).
1298592676 3707 FT0 Flyback Driver
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Patrick
Fri Feb 25 2011, 12:26AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
maybe there should be some hysterisis on that op-amp, and maybe its vulnerable to EMI/RFI or destruction due to other inductive effects?
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anuragbakshi
Fri Feb 25 2011, 03:19AM
anuragbakshi Registered Member #3707 Joined: Tue Feb 22 2011, 02:54PM
Location:
Posts: 5
I have not tested this yet so I am not sure of the effects. I have only tested it on a circuit simulator. I plan to try it this weekend.
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anuragbakshi
Fri Feb 25 2011, 03:20AM
anuragbakshi Registered Member #3707 Joined: Tue Feb 22 2011, 02:54PM
Location:
Posts: 5
Also, there is meant to be a capacitor in parallel with the primary.
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william L
Fri Feb 25 2011, 10:12AM
william L Registered Member #3093 Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
I went through and did some testing in a circuit simulator app, this circuit on it's own will not work. however, I have added only 1 capacitor and 2 resistors, and it works perfectly. (it even switches at 0 current, as far as i can tell) I'll post the schematic tomorrow.
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Antonio
Fri Feb 25 2011, 01:15PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The operational amplifier is being used as a comparator. A fast comparator would work better. The winding connected to the input must be grounded somewhere for bias. To add some protection circuits is a good idea.
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cedric
Fri Feb 25 2011, 03:23PM
cedric Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143
some mosfet drivers have very robust input and can be use as op amp.
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anuragbakshi
Fri Feb 25 2011, 10:43PM
anuragbakshi Registered Member #3707 Joined: Tue Feb 22 2011, 02:54PM
Location:
Posts: 5
here it is revised in my circuit simulator.
1298673798 3707 FT109533 Untitled
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Inducktion
Fri Feb 25 2011, 11:20PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I made it better. Half bridge now. ^^
Link2

enjoy!
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anuragbakshi
Fri Feb 25 2011, 11:29PM
anuragbakshi Registered Member #3707 Joined: Tue Feb 22 2011, 02:54PM
Location:
Posts: 5
to induktion
It is not better because the mosfets are switching at the same time. It is just higher power. An alternative is to put 2 mosfets in parallel or get a bigger mosfet.
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