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http://dx.doi.org/10.6113/JPE.2011.11.5.632

A Current-Fed Parallel Resonant Push-Pull Inverter with a New Cascaded Coil Flux Control for Induction Heating Applications  

Namadmalan, Alireza (Dept. of Electrical and Electronics Eng., Amirkabir University of Technology)
Moghani, Javad Shokrollahi (Dept. of Electrical and Electronics Eng., Amirkabir University of Technology)
Milimonfare, Jafar (Dept. of Electrical and Electronics Eng., Amirkabir University of Technology)
Publication Information
Journal of Power Electronics / v.11, no.5, 2011 , pp. 632-638 More about this Journal
Abstract
This paper presents a cascaded coil flux control based on a Current Source Parallel Resonant Push-Pull Inverter (CSPRPI) for Induction Heating (IH) applications. The most important problems associated with current source parallel resonant inverters are start-up problems and the variable response of IH systems under load variations. This paper proposes a simple cascaded control method to increase an IH system's robustness to load variations. The proposed IH has been analyzed in both the steady state and the transient state. Based on this method, the resonant frequency is tracked using Phase Locked Loop (PLL) circuits using a Multiplier Phase Detector (MPD) to achieve ZVS under the transient condition. A laboratory prototype was built with an operating frequency of 57-59 kHz and a rated power of 300 W. Simulation and experimental results verify the validity of the proposed power control method and the PLL dynamics.
Keywords
IH systems; Current Source Parallel Resonant Push-pull Inverter; cascaded control method; PLL Circuits;
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