The inductive cook tops I have come across appear to be PWM/HF for efficiency and induction performance.
Right now I am not touching induction heater/cooker but regular resistance based heater because it needs more power around 1-2.5KW
I am surprised there are no circuits for linear voltage control of mains AC.
I am not, everyone is using diac/triac, if they need a linear respond they to that by software.On the other hands, linear response is sometimes needed for instruments not for a stove.Just simple thermostat do the job with accuracy 1%
Well obviously they have no choice ) Me includingWhy there is such a problem controlling amplitude of AC ??