Performance Enhancement in Cyclo Inverter Based Induction Heating System Using Hysteresis Controller

Induction heating is a popular non-contact method for
thermal processing, valued for its rapid response, uniform heat
distribution, and accurate controllability. Improving the dynamic
behavior of IH systems particularly with respect to time-domain
characteristics, it requires the implementation of effective
feedback control strategies. This paper presents a comparative
study of two feedback controllers namely, a conventional
Proportional-Integral (PI) controller and a PI controller
integrated with a hysteresis control mechanism for an IH setup
powered by a multi-output cyclo-inverter. The proposed control
models are developed and simulated using the
MATLAB/Simulink environment. Key performance parameters
such as output current ripple and steady-state error are evaluated
under varying input conditions. Results indicate that the PI with
hysteresis controller significantly outperforms the conventional PI
controller, reducing the current ripple from 0.7 A to 0.1 A and
achieving a statistical significance level of 0.937. The performance
evaluation, conducted using SPSS software with seven samples in
each group and a statistical power set at 0.95, validates the
enhancement in dynamic response. A 100W experimental
prototype of the IH system is also developed and tested using both
controllers. The experimental results closely match the simulation
findings, demonstrating the efficiency of the suggested control
approach. The objective of this study is to improve the dynamic
response and precision control of an induction heating system
powered by a multi-output cyclo-inverter, through the
implementation of a hybrid PI-hysteresis feedback controller.