DIY 6kw induction heater with delayed lock loop(DLL)and pulse density modulation control

this is another series resonant induction heater ,current limiting and power control is done with pulse density modulation algorithms, for tracking the resonant frequency, for the first time it use a delayed lock loop(DLL) instead of commonly used PLL ,the main advantage of using DLL is its very short locking time that increases the reliability of the switching devices ,as shown in this video the heater can withstand and track very fast changes on the resonant circuit,like shorting the work coil and beacuse of using pulse density modulation , there's no hard switching at any point and we can choose low rated components:
IGBTs:4X fgh40n60smd on full bridge toplogy
maximum output: 6KW single phase
frequency range:30-100khz
maximum output current:800A
can withstand short circuit of work coil and noneloade situation continuesly

[@thefox4852]

Excelente proyecto 😸

[@mertsenay3105]

Can you share the circuit diagram of the PDM Controlled induction heater? it works perfectly. I also designed PLL controlled 100khz induction heater circuit but controlled the power using UCC3895 phase shifting Full Bridge integrated circuit. However, I could not solve the snubbar problem. I also used a second method by checking the dc bus current and voltage of the Full Bridge inverter circuit. You used a different transportation method. It caught my attention. Thank you.🙂

[@MOJTABASHOMAL]

Can you explain more about your snubber problem?

[@naeemansar3524]

Can u semd me schematic

[@sandeeps7979]

Hello sir which microcontroller used ,and did u use CT to measure zcd and pll .

[@MOJTABASHOMAL]

Hi,its not microcontroller based,its fully analog,and yes i used some CT s for feedback and measurements

[@herel6408]

Can u semd me schematic