Hello guys,

I am trying to build an induction heater but i am confused beacause whenever i find an article about it there is no source that says how i am supposed to pick the L or C for it.

I found that i can calculate the resonant frequency from the formula f=1/2π*sqrtLC but i don't know the frequency either.

So i was wondering if i just pick a frequency and from how many hz to how many hz and then calculate the L C or i have a big gap in my knowledge somewhere because i cannot understand how to find this.

Thanks for the help in advance.

 

What do you intend heating and how large/mass does it have? This is one criteria for picking the frequency

500W https://markobakula.wordpress.com/power-electronics/500w-royer-induction-heater/

 

Well just small metals and stuff like that for starters then i will go to something larger.

This guy is heating and melting stuff that i would too but i want to heat up even smaller ones.

Also i want to understand how to calculate this as well not just copy his work.

Thanks again.

 

What do you intend heating and how large/mass does it have? This is one criteria for picking the frequency

500W https://markobakula.wordpress.com/power-electronics/500w-royer-induction-heater/

Well just small metals and stuff like that for starters then i will go to something larger.

This guy is heating and melting stuff that i would too but i want to heat up even smaller ones.

Also i want to understand how to calculate this as well not just copy his work.

Thanks again.

 

Going by the industrial ones I have worked with went from large 70Kg iron plates using the mains frequency to silver solder joint for 14g steel using a single turn coil at 450Khz.
For different temperatures with the same coil, the power ON time is controlled to suit.

 

So it was depending on the duty cycle for the heat

 

So it was depending on the duty cycle for the heat

Most HF processes are just a question of setting the ON time to suit the operation.