Induction coil resonance frequency

Discussion in 'General Electronics Chat' started by gpatel, Feb 2, 2009.

  1. gpatel

    Thread Starter New Member

    Feb 2, 2009
    Hi all friends,

    I am currently making a project of Induction Heater using IGBT, and for that I want to know:

    How to find out the resonant frequency of the Induction Work Coil?

    Any measuring device? any Formula or suggestions please.

    Thank you.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    If you have the inductance of the coil, the impedance is calculated by: Xl = 2∏fl, where f is the frequency and l the inductance.

    You have to have another reactive, a capacitor, to get resonance. The circuit is resonant when Xc = Xl. Xc = 1/2∏fl.
  3. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    Yeah....what He said. :)

    I'm not sure the configuration your circuit will be...some induction heaters have a separate resonator coil (much higher inductance) across which a small portion the work coil is TAPPED. This was standard practice with the old Triode heaters, of course things might be different these days.

    If the circuit uses a tapped work coil, the capacitance thereof is usually fact the work coil is not resonant at all.