Design and Performance of the Voltage Control Loop in Induction Heating Systems with L-LC Resonant Inverters
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
In the induction heating systems1 with voltage source inverter and resonant L-LC load, different ways to control the power transferred to the heated piece are possible. This paper takes into consideration separate control loops for the inverter frequency and the power flow and the focus is on the solution to regulate the inductor current through the inverter input voltage. A transfer functions based approach is adopted in the design of the control system. The types of controllers considered for the inverter input voltage control are proportional integral derivative and then proportional integral. The controllers tuning is achieved by using the Modulus Optimum criterion in Kessler variant. It is pointed out that the controller’s parameters in both variants do not depend on the inverter load. The performances of the control system for both voltage controllers were tested and validated by simulation under the Matlab- Simulink environment by using real parameters of induction coils and heated pipes from a leading Romanian manufacturer. The results prove the very good behavior of the designed control loop with proportional integral derivative controller when both step and ramp input signal are applied. On the other hand, the performances obtained with a proportional integral controller are significantly weaker.
Authors and Affiliations
Mihaela Popescu, Alexandru Bitoleanu, Eugen Subtirelu
Keywords
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