Author Topic: More induction heating  (Read 9667 times)

Offline Alberto

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Re: More induction heating
« Reply #60 on: March 16, 2023, 12:04:01 PM »
Fuuuuuudge....


First of all, thank you again both of you for the advice, I knew it was a good idea to ask here before conecting it.

 I´ll use it only to heat getters, maybe 30 seconds long, i don´t know if that infromation matters.

The capacitors are linked with 2,5mm diameter copper wire. Removing all of them and resoldering in other support would be a PITA because now the legs are too short. I´m not sure if I have understood well, but a possible solution would be conct the ends of the bus in the other side?



I mean, close the llops and connect the induction coil to A and B? With no too much wire to stay close?

« Last Edit: March 16, 2023, 10:48:57 PM by Alberto »

Offline klugesmith

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Re: More induction heating
« Reply #61 on: March 16, 2023, 07:32:14 PM »
>> I mean, close the loops and connect the induction coil to A and B? With no too much wire to stay close?

Yes, as Dave said.   That gets you most of the possible improvement, with very little work.

Offline Alberto

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Re: More induction heating
« Reply #62 on: March 17, 2023, 11:14:10 PM »
Thank you for your answer. Ok, I link the loops and the heater works, but cant get red hot the loop of titanium wire...




veeeery disappointing, until I tried spot welding the loop, and now is HOT AS HELL BABY!!! The problem was the loop of titanium has to have a good conection in the joint.

If any of you are ever in the south of Spain and need something induction heated, or a beer, you can count with me!

The mosfets or the chockes don´t get any warm. The 100ohm resistors are 5wats (ceramic) and get hot. The capacitors and the bus a little bit hot. But the coil gets veeeery hot. First I connect the 19volts power supply and then I set the main power supply at 34 volts and when I connet it the voltage drops to 20 volts and drain 11 amps. Now I´ll try with different coils, maybe with copper tubing. If I´m right, the high frequency produces skin effect and doesn´t matter very much if the tube is hollow right?




Offline Alberto

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Re: More induction heating
« Reply #63 on: March 20, 2023, 12:02:52 AM »
Hi again. Reading the message of the guy of the video, his induction heater drains 7 amps at 35votls. What could be the reason for mi draining 11 amps at 20 volts?

Offline Alberto

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Re: More induction heating
« Reply #64 on: March 24, 2023, 08:51:48 PM »
Quote
I mean, of course the bigger the capacity the better but I don´t know how much it would be a acceptable value
For your induction heating application with separate gate supply, no filter capacitor is probably best choice.  Induction coil current will go up and down at 2x line frequency.  That is the way induction cook-tops work.  I had a 1kW ZVS oscillator that ran that way too, with rectified line voltage and no filter cap.

With the switching power supply it seems work well, gets very hot, but worked,

But I think this heater doesn´t like pulsating DC. I tried with a rewonded MOT. 30 turns of 1,5mm2 wire to get 22 volts after the full brigge rettifier and after 2 seconds started to drain 40 amps (i´m not sure, I disconected quickly, but I think I saw 41 amps) and noww one of the mosfet is dead.




Offline davekni

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Re: More induction heating
« Reply #65 on: March 24, 2023, 10:33:26 PM »
Quote
But I think this heater doesn´t like pulsating DC. I tried with a rewonded MOT. 30 turns of 1,5mm2 wire to get 22 volts after the full brigge rettifier and after 2 seconds started to drain 40 amps (i´m not sure, I disconected quickly, but I think I saw 41 amps) and noww one of the mosfet is dead.
That's disappointing.  With gate supply on first, I didn't expect any issues.  Only possibility that comes to mind is that a loose connection caused the ZVS circuit to suddenly drop power, causing a voltage spike across transformer inductance.  Sounds like switching supply is safer route.
Did the spot weld of the titanium wire loop break?  That's another possibility for sudden drop in power.  Just removing the loop by hand should be plenty slow to avoid any issue.
Presuming you noticed my previous caution that power needs to be switched on the secondary 22V side, not on line power.  Any turn-off of line power to transformer while ZVS is connected to secondary would produce a likely-damaging voltage spike.  (Of course, after current went to 40A, damage was presumably already done, so it didn't matter where power was switched off then.  Only matters for any previous switching using the transformer.)
David Knierim

Offline Alberto

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Re: More induction heating
« Reply #66 on: March 24, 2023, 10:48:08 PM »
Quote
But I think this heater doesn´t like pulsating DC. I tried with a rewonded MOT. 30 turns of 1,5mm2 wire to get 22 volts after the full brigge rettifier and after 2 seconds started to drain 40 amps (i´m not sure, I disconected quickly, but I think I saw 41 amps) and noww one of the mosfet is dead.
That's disappointing.  With gate supply on first, I didn't expect any issues.  Only possibility that comes to mind is that a loose connection caused the ZVS circuit to suddenly drop power, causing a voltage spike across transformer inductance.  Sounds like switching supply is safer route.
Did the spot weld of the titanium wire loop break?  That's another possibility for sudden drop in power.  Just removing the loop by hand should be plenty slow to avoid any issue.
Presuming you noticed my previous caution that power needs to be switched on the secondary 22V side, not on line power.  Any turn-off of line power to transformer while ZVS is connected to secondary would produce a likely-damaging voltage spike.  (Of course, after current went to 40A, damage was presumably already done, so it didn't matter where power was switched off then.  Only matters for any previous switching using the transformer.)

Thanks for your answer.  Yes I connect first the secondary and later the primary to the 220 AC.  Maybe that was the problem

I hardly had time to out a piece of iron to try the heater when I see the rise of current
« Last Edit: March 24, 2023, 11:13:20 PM by Alberto »

Offline davekni

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Re: More induction heating
« Reply #67 on: March 24, 2023, 11:31:44 PM »
Quote
Yes I connect first the secondary and later the primary to the 220 AC.  Maybe that was the problem
Unless there was contact-bounce in the switch, turn-on shouldn't be an issue.  Only turn-off on the 220VAC primary side is problematic.  Whatever the cause, sounds like switching supply is safer.  (Or enough filter capacitance after rectifier to absorb any transient energy, say >=5000uF.)  So far my AC line powered ZVS oscillator hasn't died.  However, it runs directly on rectified 120VAC.  No transformer except utility transformer feeding my neighborhood.
David Knierim

Offline Alberto

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Re: More induction heating
« Reply #68 on: March 25, 2023, 01:53:15 AM »
Ok ok I'll try whith some capacitors to filter.

Thank you

Offline petespaco

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Re: More induction heating
« Reply #69 on: March 25, 2023, 03:48:26 AM »
Regarding the addition of some filter capacitors-
  I have four 8600uf 60 volt electrolytic capacitors wired in parallel with 10 gauge wire that I can easily apply to the rectified output (up to 48 volts) of various transformer secondaries.  I use them if I think ripple is too much for whatever project I am working on.  Not necessarily very scientific, but it seems to work.   One thing to consider is the inrush current needed to charge them up upon power up.  So far I haven't had any issues, though.

Offline Alberto

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Re: More induction heating
« Reply #70 on: March 25, 2023, 04:16:55 AM »
Thank you. Since they are cheap and the shop sell minimum 10 caps I'll go for 10 50v 4700uf in parallel

Offline klugesmith

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Re: More induction heating
« Reply #71 on: March 25, 2023, 03:44:17 PM »
>> One thing to consider is the inrush current needed to charge them up upon power up.  So far I haven't had any issues, though.

In Alberto's case, using a rewound MOT, leaving core shunts in would ease the inrush current.

Offline Alberto

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Re: More induction heating
« Reply #72 on: March 25, 2023, 07:57:37 PM »
Thanks for your answer. Yes I have kept the shunts

Offline Alberto

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Re: More induction heating
« Reply #73 on: March 27, 2023, 03:56:19 AM »
>> One thing to consider is the inrush current needed to charge them up upon power up.  So far I haven't had any issues, though.

In Alberto's case, using a rewound MOT, leaving core shunts in would ease the inrush current.
.

How much could be that current? Since the transformer could deliver 41 amps maybe I'll need a bigger rectifier (the actual ones is rated for 25 amps)

Offline Alberto

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Re: More induction heating
« Reply #74 on: April 01, 2023, 07:19:22 PM »
Regarding the addition of some filter capacitors-
  I have four 8600uf 60 volt electrolytic capacitors wired in parallel with 10 gauge wire that I can easily apply to the rectified output (up to 48 volts) of various transformer secondaries.  I use them if I think ripple is too much for whatever project I am working on.  Not necessarily very scientific, but it seems to work.   One thing to consider is the inrush current needed to charge them up upon power up.  So far I haven't had any issues, though.

I have bought 20 2200 uf 63V capacitors to attach in pararllel. Should I have any precautions? or it doesnt matter the way I make since is low voltage and DC

Thank you

Offline davekni

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Re: More induction heating
« Reply #75 on: April 01, 2023, 10:47:37 PM »
Quote
I have bought 20 2200 uf 63V capacitors to attach in pararllel. Should I have any precautions? or it doesnt matter the way I make since is low voltage and DC
Can't think of any issues or critical requirements for line-frequency filtering.  And your 25A rectifier should have plenty-high inrush current specification.
David Knierim

Offline Alberto

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Re: More induction heating
« Reply #76 on: April 02, 2023, 11:21:22 AM »
Thank you!

Offline romy

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Re: More induction heating
« Reply #77 on: April 04, 2023, 02:45:45 PM »
this and this:

/>
/>
i wonder if your heater could drive such concentrators.

Offline Alberto

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Re: More induction heating
« Reply #78 on: April 04, 2023, 11:02:25 PM »
this and this:

/>
/>
i wonder if your heater could drive such concentrators.

Very interesting!!

So with the piece of ferrite you can concentrate the induction effect. I have no idea.

I´ll made some experiments but with others cheap induction heaters. Thank you!

Offline romy

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Re: More induction heating
« Reply #79 on: April 07, 2023, 07:21:26 AM »
i reread the thread and got lost a little. so you made your own cirquit using a separate 19vdc gate supply and were running it on 35vac (from transformer) and a rectifier? and then when you lowered the drive to 22v (rewound) the thing failed?

High Voltage Forum

Re: More induction heating
« Reply #79 on: April 07, 2023, 07:21:26 AM »

 


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post Re: Anyone had success using analogue/digital HV panel meters?
[Beginners]
MRMILSTAR
January 26, 2024, 04:28:38 PM
post Re: Anyone had success using analogue/digital HV panel meters?
[Beginners]
Luca c.
January 26, 2024, 03:34:10 PM
post Re: Anyone had success using analogue/digital HV panel meters?
[Beginners]
FPS
January 26, 2024, 11:49:48 AM
post Re: Anyone had success using analogue/digital HV panel meters?
[Beginners]
TizianoBll
January 26, 2024, 11:04:37 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
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