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4hv.org :: Forums :: High Voltage
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SMPS Flyback question

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Sulaiman
Sat Jun 16 2012, 05:59PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Since neither you nor I know the halogen transformer frequency
or the inductance of your primary on the flyback transformer
I can't give a definite answer,

If 0.68 uF is what you have, use it,
before you make a 'good' primary
try 8,7,6,5,4... turns with the 0.68 uF capacitor, see if there is a 'sweet spot'
the capacitor should be in parallel with (across)
the flyback primary and halogen transformer output

If the halogen transformer can survive, a series-resonant arrangement
would probably get the most power output
with the capacitor in series with the flyback primary,
if the resonant frequency matches the halogen transformer output frequency
you will get the most power throughput
you may also destroy your flyback secondary due to over-voltage. ;)
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zippotix
Sat Jun 16 2012, 07:41PM
zippotix Registered Member #5208 Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
Something like this? Link2
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Sulaiman
Sat Jun 16 2012, 10:33PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Yes,
Exactly like that.
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Dr. Dark Current
Sun Jun 17 2012, 01:12PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The capacitor in *parallel* to the halogen transformer output will most likely kill it. The output is a square wave and you know what a capacitor supplied with a square wave voltage does.
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Ash Small
Sun Jun 17 2012, 01:18PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Platinum has quite a bit of experience with this setup, but he has managed to destroy several halogen transformers. He has some old threads with huge arcs somewhere.

EDIT: found a link to one of his threads on the subject:

Link2

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zippotix
Sun Jun 17 2012, 05:29PM
zippotix Registered Member #5208 Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
So it's a bad idea to connect cap to it? Ash Small, I saw those videos, thanks. The output of the halogen transformer is AC, I thought it's sinusoidal?
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zippotix
Sun Jun 17 2012, 05:50PM
zippotix Registered Member #5208 Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
By the way, which zener should I buy for ZVS? I think 12V should do? And 10k resistor, should it be of any specific type? Or just normal 10k 1W one?
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Dri0m
Mon Jun 18 2012, 05:40AM
Dri0m Registered Member #4497 Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62
zippotix wrote ...

By the way, which zener should I buy for ZVS? I think 12V should do? And 10k resistor, should it be of any specific type? Or just normal 10k 1W one?

some people says that ZVS with 12V ZD doesn't work (neither to me), buy both 12V and 15V and try it. The 10k resistor can be any 1W one
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zippotix
Mon Jun 18 2012, 11:26AM
zippotix Registered Member #5208 Joined: Thu Jun 07 2012, 06:12PM
Location:
Posts: 86
Dri0m,I have this zener diode, it's not typical straight design but I've been told it works the same Link2 I have only 0,25W 10k resistor, it's too weak? By the way, 0.68uF is the same as 680nF, right?
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Dri0m
Mon Jun 18 2012, 04:19PM
Dri0m Registered Member #4497 Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62
zippotix wrote ...

Dri0m,I have this zener diode, it's not typical straight design but I've been told it works the same Link2 I have only 0,25W 10k resistor, it's too weak? By the way, 0.68uF is the same as 680nF, right?

that diode looks old. 0.25W resistor will probably heat, but not overheat, so it should work

...and yes... but capacity is not critical, i'm personally using 4uF cap, higher capacity = higher power, but 680nF is good
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