Power density and sample temperature control for microwave heating system

The aim of this paper is firstly to describe the design and implementation of a dual-closed loop control technology for microwave heating system. A fast feedback control strategy was proposed for the microwave power density control loop. Moreover, a bang-bang control strategy and a velocity form of PID algorithm were utilized for the sample temperature control loop. Further, several experimentations were carried out, experiment results show that the output microwave power is reasonable exact to the set point, and the PID algorithm resulted in the best sample temperature control compared to the bang-bang strategy.