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LAN_403

Platinum

Sun Jul 03 2011, 11:02PM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Could I use a halogen transformer the same way a ZVS induction heater works?

If so how?

Thanks.

I bought another one, it is max 200W halogen 'former.

I'm also going to make a High current flyback core 'former.

The reason I asked this, is because I can run a flyback of a halogen transformer which is high freq. AC, I was wondering if I could somehow make it into a induction heater like the ZVS driver.

I've also took a flybak core out and rewound ot for high current, ahh it's fun.

Arcstarter

Mon Jul 04 2011, 01:34AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Well you are being a bit vague, but i assume you are asking if it could be used *as* an induction heater. The short answer is yes, but there are many things you will need to consider such as getting the work coil's impedance right. You will probably need a bunch of turns to ensure the impedance is high enough to keep the PSU from shutting down from overcurrent, so a stepdown transformer may be a good idea, so you can use less turns for the work coil.

Keep in mind 200w is not a whole lot of power, so don't expect anything too impressive. You could turn nails and stuff like that red, but nothing big.

Platinum

Mon Jul 04 2011, 01:44AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

I don't mind the power, as you said 200W will turn small nails red, this is my first one anyway. Thanks for the help.

How would I wire it up?

To not set off the short circuit, I could use a inductive ballast I suppose, that's what I normally use, then just add a work coil?

Arcstarter

Mon Jul 04 2011, 01:54AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Platinum wrote ...

I don't mind the power, as you said 200W will turn small nails red, this is my first one anyway. Thanks for the help.

How would I wire it up?

To not set off the short circuit, I could use a inductive ballast I suppose, that's what I normally use, then just add a work coil?

That would probably work. There are surely better ways of doing it, but like you said, this is your first one anyway

Oh, and since when have induction heaters been hv

Platinum

Mon Jul 04 2011, 02:16AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

So how do I wire it all up, I've made a schematic, it sucks I know, it's the first one I've ever done, and I ripped the ballasting transformer form some website and pasted it. Anyway.

Is this it?

GXHG1

Inducktion

Mon Jul 04 2011, 05:43AM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Arcstarter wrote ...

That would probably work. There are surely better ways of doing it, but like you said, this is your first one anyway

Oh, and since when have induction heaters been hv

What do you think vacuum tubes used? :P

Platinum

Mon Jul 04 2011, 05:59AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

So can someone tell me if that schematic is what I do?

Dr. ISOTOP

Mon Jul 04 2011, 07:37AM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

If the halogen supply is a fixed-frequency AC source, it'll be hard to tune the LC to the correct frequency. Induction heaters draw no current unless you are very closely in tune.
Also, they get
HOT
and I don't mean the work piece, I mean the work coil.
My big (CM400 bridge) induction heater's 1/4" tube work coil got hot enough to discolor during a 200W test (5A@40V in, 20:1 coupling transformer). At the work coil currents necessary to provide good performance, I^2R losses are tremendous.
For good performance you want a decent step-down ratio (twiddle the ratio until you draw an acceptable current at your input voltage. Attached is a rough schematic; pardon the disgustingness of the drawing.

Ash Small

Mon Jul 04 2011, 08:13AM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

bwang wrote ...

If the halogen supply is a fixed-frequency AC source, it'll be hard to tune the LC to the correct frequency. .

I suspect that the halogen transformer may output pulsed DC (as in SMPS) but I don't know.

I was going to give some advice on tuning (adding capacitors, etc) but without knowing the output waveform of the halogen transformer it's difficult to say what will work and what won't.

Platinum

Mon Jul 04 2011, 08:49AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Well the one I have I'm not sure the freq.

But nearly all of them run at some 35-40Khz.

So is it going to work or not?

Bwang what is the 20:1 coupling 'former?

I can use a flyback core for that, as I have a few, but will that work?

Also what capacitors do you mean?

Also Ash, it is AC, even the output stmaped on it says 11.4V High Freq. AC

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