Dear Friends,

I am from a Charitable NGO feeding mid-day meals to school going children across India. We are working on a temperature controlled Induction heating cookwares like Cook top, boilers, Wok, brat pans etc., Basically on the concepts of Multi-zone induction wok — IGBT zone switching, PID temperature control, and zone-level wall temperature sensing. I have specific requirements like the below

• Mutual coupling between concentric coil zones — has anyone implemented DSP-based cross-talk cancellation on a dome coil?
• IR thermopile at 3–8mm range looking upward at a SS vessel base — emissivity calibration approach?
• PID tuning for a large thermal mass vessel — any practical experience with anti-windup strategies for induction heating?

Attaching few files for your reference. Kindly suggest some practical design implementations and any leads who can render technical support at India

Mod: created new thread, Link to old thread
https://forum.allaboutcircuits.com/...n-coil-with-pid-controller.122175/post-979439

 

PID tuning for a large thermal mass vessel — any practical experience with anti-windup strategies for induction heating?

Have you considered Fuzzy Logic control, which does not have a integrator that is subject to windup.
Fuzzy Logic also can generally handle non-linear and hysteresis system characteristics better than PID which your system is likely to have, as PID is predicated on the system having a linear response.
Here's a tutorial on Fuzzy Logic, if interested.

 

How precisely does the temperature actually need to be controlled?? I have been very successful holding an oil tank temperature within +-2 degrees for many hours. Since the oil was circulating thru tested items the heating method was forcing it thru an orifice, with a bypass valve for whan it was not heating. The temperature control logic was ON/OFF with a 5 second interval and one degree of hysteresis. So control was either on or off at five second intervals. It was a commercially available controller, standard product. We did use a solid state control relay and the triac on/off connection to the controller. The only analog part of the system was the thermocouple.