DIY Induction Heater Builds and References

[Piteer]

I used an esp32 that I programmed so I could set the target temperature over bluetooth. Then I connected a 36v 15a mosfet to that so I could power on and off the induction heater according to the current temperature. Worked very well until I blew a power supply because I made my coil of less wraps to increase the power.

I'd like to make something like this but reliable, it's proving to be quite difficult to make a reliable ZVS circuit. Some other guy on another forum says it will never work reliably unless we move to very advanced circuits, I'm not entirely convinced it can't be done but I'll probably be paying an engineer to make it more robust so I can use it in a product I'm working on.

I made 3 Induction heater Prototype with IR Temp control, the first is tested for 6 months and still running, now i testing No 3 and so far it work. I used Arduino and a Optocoupler for turn on the Gate 12V supply for the Chinese heater. The HalfPint got too hot so i changed to the original IH. Still have some Program fail but it work !


https://ibb.co/Jwn9pCC7

20250121_224202 hosted at ImgBB

Image 20250121_224202 hosted in ImgBB

ibb.co

 

[Gomaruana]

I made 3 Induction heater Prototype with IR Temp control, the first is tested for 6 months and still running, now i testing No 3 and so far it work. I used Arduino and a Optocoupler for turn on the Gate 12V supply for the Chinese heater. The HalfPint got too hot so i changed to the original IH. Still have some Program fail but it work !


https://ibb.co/Jwn9pCC7

20250121_224202 hosted at ImgBB

Image 20250121_224202 hosted in ImgBB

ibb.co

Very cool! Reminds me of my build, I should look if I still have some images from it. I'm was using it to heat up a full sized ballvape, so that's why it broke down in the end. I did use one for about half a year or something but that prototype had a bit less metal mass to heat.

 

[waungus]

Having a bit of trouble.. I'm following the guide on page 13, but I think I have a different version of the board. It still has a third contact pad and I can't see a ground trace between the mosfets. Is there another guide for this version of the board? I'd appreciate any guidance. here's an imgur link with a picture of my board

https://imgur.com/a/8suJONL

 

[waungus]

Having a bit of trouble.. I'm following the guide on page 13, but I think I have a different version of the board. It still has a third contact pad and I can't see a ground trace between the mosfets. Is there another guide for this version of the board? I'd appreciate any guidance. here's an imgur link with a picture of my board

https://imgur.com/a/8suJONL

I went ahead with some steps and think I might understand it a bit more now... is this diagram I drew up correct?

What purpose does the magnetic wire loop on the other side serve? I'm confused because to me it seems like that's there if you don't want to add a switch, but if you're not adding a switch whats the point of cutting the trace? Is it there if you cut the board and the trace on the bottom is unaccessible?

Also with this board, where would I connect the negative?

https://imgur.com/a/4a5Ur6p

 

[Mr_Hodag]

Is their a build/how-to guide for a temperature controlled induction heater?