Mini induction heater IRFP460 5 MHz
zilipoper, Tue Jul 24 2012, 03:15PMHi this is my Mini induction heater made in 20 minutes
without load, he does not consume power
he does not explode, when 50V strongly bask capacitors
scheme
Re: Mini induction heater IRFP460 5 MHz
Steve Conner, Tue Jul 24 2012, 05:06PM
очень хорошо! Thanks for posting the schematic
Steve Conner, Tue Jul 24 2012, 05:06PM
очень хорошо! Thanks for posting the schematic
Re: Mini induction heater IRFP460 5 MHz
zilipoper, Tue Jul 24 2012, 05:43PM
thank you
zilipoper, Tue Jul 24 2012, 05:43PM
thank you
Re: Mini induction heater IRFP460 5 MHz
Chip Fixes, Tue Jul 24 2012, 09:17PM
Ah this is awesome! What was your input voltage? and what's a good wire to use for the coil?
Chip Fixes, Tue Jul 24 2012, 09:17PM
Ah this is awesome! What was your input voltage? and what's a good wire to use for the coil?
Re: Mini induction heater IRFP460 5 MHz
Gabriel35, Tue Jul 24 2012, 11:14PM
How much power it can handle?
I mean, how much voltage is safe to put on "+U"?
Does the potentiometer controls the frequency?
Does it take feedback directly from the coil?
Interesting Schematic, i've never seen a so simple driver before...
Gabriel35, Tue Jul 24 2012, 11:14PM
How much power it can handle?
I mean, how much voltage is safe to put on "+U"?
Does the potentiometer controls the frequency?
Does it take feedback directly from the coil?
Interesting Schematic, i've never seen a so simple driver before...
Re: Mini induction heater IRFP460 5 MHz
kimbomba, Tue Jul 24 2012, 11:26PM
Very nice result. What is the voltage rating on the capacitors? Is D1 a zener? thanks for sharing.
kimbomba, Tue Jul 24 2012, 11:26PM
Very nice result. What is the voltage rating on the capacitors? Is D1 a zener? thanks for sharing.
Re: Mini induction heater IRFP460 5 MHz
zilipoper, Wed Jul 25 2012, 06:16AM
D1- zener. supply voltage I had 40-50V
The higher the voltage, the more heated coil and capacitors
zilipoper, Wed Jul 25 2012, 06:16AM
D1- zener. supply voltage I had 40-50V
The higher the voltage, the more heated coil and capacitors
Re: Mini induction heater IRFP460 5 MHz
Gabriel35, Wed Jul 25 2012, 04:24PM
How much voltage is safe to put on "+U"?
Does the potentiometer controls the frequency?
Does it take feedback directly from the coil?
Gabriel35, Wed Jul 25 2012, 04:24PM
How much voltage is safe to put on "+U"?
Does the potentiometer controls the frequency?
Does it take feedback directly from the coil?
Re: Mini induction heater IRFP460 5 MHz
kimbomba, Wed Jul 25 2012, 06:35PM
What is the type and voltage rating of you capacitors? how many turns you have for feedback?
kimbomba, Wed Jul 25 2012, 06:35PM
What is the type and voltage rating of you capacitors? how many turns you have for feedback?
Re: Mini induction heater IRFP460 5 MHz
Chip Fixes, Wed Jul 25 2012, 07:40PM
Will it at least melt solder with 24v? I just built one but I don't have a variac :P
Chip Fixes, Wed Jul 25 2012, 07:40PM
Will it at least melt solder with 24v? I just built one but I don't have a variac :P
Re: Mini induction heater IRFP460 5 MHz
Josh Campbell, Wed Jul 25 2012, 08:33PM
Cool. At 5MHz the depth of penetration (and thus the area where I2R heating takes place) will only be a few 10s of μm depending on the R of the work piece. You can really see that in the video too. The rod appears to be heated red hot but when removed it almost immediately cools because the internal temp was nowhere near the temp of the skin. Great demo!
Josh Campbell, Wed Jul 25 2012, 08:33PM
Cool. At 5MHz the depth of penetration (and thus the area where I2R heating takes place) will only be a few 10s of μm depending on the R of the work piece. You can really see that in the video too. The rod appears to be heated red hot but when removed it almost immediately cools because the internal temp was nowhere near the temp of the skin. Great demo!
Re: Mini induction heater IRFP460 5 MHz
Microwatt, Fri Jul 27 2012, 12:12AM
I think you should get some litz wire.
Microwatt, Fri Jul 27 2012, 12:12AM
I think you should get some litz wire.
Re: Mini induction heater IRFP460 5 MHz
2Spoons, Fri Jul 27 2012, 12:50AM
Simple. Elegant. Effective.
Bravo!
2Spoons, Fri Jul 27 2012, 12:50AM
Simple. Elegant. Effective.
Bravo!
Re: Mini induction heater IRFP460 5 MHz
hsieh, Sun Jul 29 2012, 12:13AM
I build it but it don't work.It short my power supply.Did I made any mistake?
hsieh, Sun Jul 29 2012, 12:13AM
I build it but it don't work.It short my power supply.Did I made any mistake?
Re: Mini induction heater IRFP460 5 MHz
zilipoper, Sun Jul 29 2012, 01:27AM
IT IS NECESSARY TO ACHIEVE BY MEANS OF THE RESONANCE OSCILLOGRAPH IN TWO CONTOURS
OR TO MAKE COMPLETELY AS AT ME
select capacitor a drain - the source, yet won't be a resonance
zilipoper, Sun Jul 29 2012, 01:27AM
IT IS NECESSARY TO ACHIEVE BY MEANS OF THE RESONANCE OSCILLOGRAPH IN TWO CONTOURS
OR TO MAKE COMPLETELY AS AT ME
select capacitor a drain - the source, yet won't be a resonance
Re: Mini induction heater IRFP460 5 MHz
Steve Ward, Sun Jul 29 2012, 06:09AM
I would not use a ceramic for the drain-source capacitor, mica or PP film (something rated for large AC voltages) would be best. The 10uF supply cap, however would probably work great as ceramic or PP film.
I think also, if you couple too strongly to a resistive load, you might lower the gain of the system so much that it will not oscillate. You should be able to prevent this by over-sizing the work coil compared to the work piece, or limiting how close the work piece is to the coil.
I might also look at putting a clamping diode (15V bi-directional TVS would be my choice) on the gate-source of the mosfet for protection. This should allow you to add more turns on the feedback winding without risk of blowing out the gate. I think the capacitive coupling should still be OK, even with the clamping diodes.
If you power it up and it just shorts the power supply, then turn the potentiometer all the way to zero, then turn on the supply, they try turning up the pot to start the thing oscillating.
Also, i see no reason you cannot lower the operating frequency by making the drain-source capacitor larger, or using more turns on your work coil (and feedback coil).
Steve Ward, Sun Jul 29 2012, 06:09AM
I would not use a ceramic for the drain-source capacitor, mica or PP film (something rated for large AC voltages) would be best. The 10uF supply cap, however would probably work great as ceramic or PP film.
I think also, if you couple too strongly to a resistive load, you might lower the gain of the system so much that it will not oscillate. You should be able to prevent this by over-sizing the work coil compared to the work piece, or limiting how close the work piece is to the coil.
I might also look at putting a clamping diode (15V bi-directional TVS would be my choice) on the gate-source of the mosfet for protection. This should allow you to add more turns on the feedback winding without risk of blowing out the gate. I think the capacitive coupling should still be OK, even with the clamping diodes.
If you power it up and it just shorts the power supply, then turn the potentiometer all the way to zero, then turn on the supply, they try turning up the pot to start the thing oscillating.
Also, i see no reason you cannot lower the operating frequency by making the drain-source capacitor larger, or using more turns on your work coil (and feedback coil).
Re: Mini induction heater IRFP460 5 MHz
hsieh, Sun Jul 29 2012, 07:33AM
My induction heater start working now.Something in my circuit is dead.I change it and it works.
But it is still very unstable.I have to slowly turn the potentiometer until oscillate .Sometimes I turn it off and power it up again,it don't oscillate and short my power supply.
I will try mica capacitor next time.
hsieh, Sun Jul 29 2012, 07:33AM
My induction heater start working now.Something in my circuit is dead.I change it and it works.
But it is still very unstable.I have to slowly turn the potentiometer until oscillate .Sometimes I turn it off and power it up again,it don't oscillate and short my power supply.
I will try mica capacitor next time.
Re: Mini induction heater IRFP460 5 MHz
zilipoper, Sun Aug 05 2012, 12:04AM
device according to the same scheme:-)
Single transistor class-E GENERATOR
Power supply 15V 1-5A
FREQUENCY 4mhz
zilipoper, Sun Aug 05 2012, 12:04AM
device according to the same scheme:-)
Single transistor class-E GENERATOR
Power supply 15V 1-5A
FREQUENCY 4mhz
Re: Mini induction heater IRFP460 5 MHz
Platinum, Sun Aug 05 2012, 03:22PM
Ahh I need a ZVS :(
Platinum, Sun Aug 05 2012, 03:22PM
Ahh I need a ZVS :(
Re: Mini induction heater IRFP460 5 MHz
Forty, Sun Aug 05 2012, 07:17PM
@platinum: this isn't a zvs. as far as i know it's more of an armstrong oscillator.
@zilipoper: very cool stuff you've made here. I think I'll try the circuit out myself. As mentioned by others, the skin depth of the induction heater might be low, but it still might be useful (soldering maybe?) How many turns do you recommend for the primary and feedback in both applications?
Forty, Sun Aug 05 2012, 07:17PM
@platinum: this isn't a zvs. as far as i know it's more of an armstrong oscillator.
@zilipoper: very cool stuff you've made here. I think I'll try the circuit out myself. As mentioned by others, the skin depth of the induction heater might be low, but it still might be useful (soldering maybe?) How many turns do you recommend for the primary and feedback in both applications?
Re: Mini induction heater IRFP460 5 MHz
klugesmith, Tue Aug 07 2012, 06:13PM
You can heat treat the wear surface of a gear, without distorting or making the core brittle.
Here's a video where the quench (rapid cooling) is by conduction to the core.
Here's one where they hose down the workpiece (and work coil).
[edit] Even better: a spectacular combination of both!
And induction heat for progressively bending steel pipe with 100 mm wall thickness.
To zilipoper: great work. You may inspire many first-time inductioneers. Maybe me.
klugesmith, Tue Aug 07 2012, 06:13PM
2bytes wrote ...
Cool. At 5MHz the depth of penetration (and thus the area where I2R heating takes place) will only be a few 10s of μm depending on the R of the work piece. You can really see that in the video too. The rod appears to be heated red hot but when removed it almost immediately cools because the internal temp was nowhere near the temp of the skin. Great demo!
That's the main feature of "induction hardening", which has been used in factories since the 1940s or earlier.Cool. At 5MHz the depth of penetration (and thus the area where I2R heating takes place) will only be a few 10s of μm depending on the R of the work piece. You can really see that in the video too. The rod appears to be heated red hot but when removed it almost immediately cools because the internal temp was nowhere near the temp of the skin. Great demo!
You can heat treat the wear surface of a gear, without distorting or making the core brittle.
Here's a video where the quench (rapid cooling) is by conduction to the core.
Here's one where they hose down the workpiece (and work coil).
[edit] Even better: a spectacular combination of both!
And induction heat for progressively bending steel pipe with 100 mm wall thickness.
To zilipoper: great work. You may inspire many first-time inductioneers. Maybe me.
Re: Mini induction heater IRFP460 5 MHz
Gabriel35, Thu Aug 09 2012, 02:27PM
Would be possible to melt steel with this heater using higher voltages like 120v?
Or the purpose is just surface heating (5Mhz)
Gabriel35, Thu Aug 09 2012, 02:27PM
Would be possible to melt steel with this heater using higher voltages like 120v?
Or the purpose is just surface heating (5Mhz)
Re: Mini induction heater IRFP460 5 MHz
Tigeris, Sun Aug 26 2012, 12:02AM
I have a very dumb question. The input voltage...is it AC or DC? Sorry for the noob questions
Tigeris, Sun Aug 26 2012, 12:02AM
I have a very dumb question. The input voltage...is it AC or DC? Sorry for the noob questions
Re: Mini induction heater IRFP460 5 MHz
haxor5354, Sun Aug 26 2012, 08:41PM
most definately DC lol
i just build this circuit, it was oscillating at 3.8Mhz with a 0.5nF silver mica cap going from drain to source (at first i used a ceramic cap and it got too hot so i swapped it)
takes about 50W on standby and 60W with a screw driver inside the coil
and the 10uF electrolytic cap was pretty hot to touch, scared that it might explode
haxor5354, Sun Aug 26 2012, 08:41PM
Tigeris wrote ...
I have a very dumb question. The input voltage...is it AC or DC? Sorry for the noob questions
I have a very dumb question. The input voltage...is it AC or DC? Sorry for the noob questions
most definately DC lol
i just build this circuit, it was oscillating at 3.8Mhz with a 0.5nF silver mica cap going from drain to source (at first i used a ceramic cap and it got too hot so i swapped it)
takes about 50W on standby and 60W with a screw driver inside the coil
and the 10uF electrolytic cap was pretty hot to touch, scared that it might explode
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