Alternative Inverter for Induction Heater

Discussion in 'General Electronics Chat' started by ajrenzetti, Dec 22, 2010.

  1. ajrenzetti

    Thread Starter Member

    Dec 20, 2010
    Its been a while now since ive decided to make an induction heater. I have had no success whatsoever using a half-bridge inverter. the mosfets,igbts, and even transisters never seemed to turn on when they were fed the signal and connected to the source, even when i used mosfet drivers and induction heater schematics submitted by others who have gotten it to work.

    I was wondering, since induction heaters use inverting sine waves in the work coil, if instead of using a half bridge or full bridge inverter, if i were to make the inverter from this circuit: The only difference would be adding a DC blocking capacitor at the output and making the op-amp from high power transistors like in this design:

    I also took a look at the circuits on this web page:

    Would these circuits work as an alternative to the half bridge inverter used in induction heating?
  2. jaangalab

    New Member

    Mar 28, 2010
    hi frnds if u want make it u shoud need a circuit
    1st driver with CL, FEEDBACK etc and high power igbt or mosfet
    and tell me what pupose u want it
  3. marshallf3

    Well-Known Member

    Jul 26, 2010
  4. Adjuster

    Well-Known Member

    Dec 26, 2010
    Operational amplifiers are low-power linear circuits which have little in common with the sort of high power system you require. Scaling up an op-amp is not a sensible approach to this problem.

    You would probably be better advised to investigate why you have had no success with circuits which other people have used. Are you sure that you really have obtained valid tested designs?
  5. ajrenzetti

    Thread Starter Member

    Dec 20, 2010
    they have all been valid designs. but ive recently come accross the zvs induction heater design, and it seems to work if i connect it to a dc-dc converter and not directly from my power supply.