8 kW Induction Cooktop Teardown

Teardown of a 8 kW induction cooktop, supplied from 2 single phase mains and neutral. Modular construction with two inverter modules and changeable coils. To get a full explanation on Quasi-Resonant induction heaters, check out my teardown and hacking videos on the IKEA Tillredda induction stoves.

Induction Heater Coils

The induction stove coils are almost all identical and the differences in the size of each cooking zone is purely done in software or configuration on the PCB. Coils are made from litz wire in insulating foam and heat reflecting materials. This is to avoid heat from the pan heating up the coils, which struggle enough with heat from skin effect losses and proximity effect.

Induction heater inverter

The 8 kW induction stove inverters are two separate modules which each has two cooking zones. Each module has a common input, noise filter and bridge rectifier. Each cooking zone and induction coils is connected to separate half-bridge inverters which uses 4 uF of DC bus capacitance and two 0.68 uF / 800 VDC 50 kHz resonant capacitors.

8 kW Induction Cooktop Parts

First the input bridge rectifier is a Chinese brand model D25XB60, which is a 25 A at 600 V rectifier diode. Secondly the IGBT is a Toshiba GT60J323 in a TO-3P package. The IGBT is rated for 33 A continues current at 600 V or 120 A pulsed current. To learn more about power electronics and discuss high voltage and high current experiments, visit the High Voltage Forum.

Thirdly the controller that is used on all printed circuit boards is a ST Microelectronics ST72325 8 bit microcontroller. This had built in Flash/ROM, ADC, timer, SPI, SCI and I2C interface. All the controllers are therefor most likely communicating over I2C and not CANBus as mentioned in the video.

4 thoughts on “8 kW Induction Cooktop Teardown”

  1. I just found this site. Really good stuff man. I hope you’re still at it. Not much left in the way of individual experimentation and knowledge especially in this field. Hope you’re well. Keep it up, brother.

    Cheers

  2. Hi Jay

    Thank you very much for the kinds words, it is encouraging to know there are readers 🙂

    I am still at it and continues to write about my projects and make Youtube videos 🙂

    Kind regards
    Mads

  3. I found this site by looking for info on these induction cookers. I’m not that good at electrical stuff, but got an idea if I could use this cooker with broken top as a heater for rusty bolts. I did some experiments and it just has too much electronics and safety and throws me various errors, mostly that there is no cookware. Any idea if I can bypass smart electronics and use same coils or connect special coils and make it work to heat bolts? Or just tear it down to basic components and solder some basic inductor?

    Thanks! 🙂

  4. Hi Giedrius

    You are better off looking for a ZVS induction heater for bolts, a cooker needs pan detection to avoid over-current situations where it will burn itself to the ground 🙂

    Kind regards
    Mads

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