Abstract
Induction heating is one of the most effective methods of energy conversion from the electrical to thermal form, used in diverse industrial processes. In this paper the resonance generators for induction heating are considered for which the equivalent load resistance has a strong impact on the ability of the system to use optimally the potentially available power. The equivalent load resistance varies, depending on the type of induction heating system (IHS) and during the heating process itself. This paper presents an induction heat generator in which an L-LC resonance system (called the LLC system) plays an active role in energy matching. The LLC resonance system is analyzed from the point of view of both the functional dependencies describing the influence of frequency on the load resistance transformation, and the impact of the LLC setup on the sensitivity of the generator to changes in the charge resistance caused by heating. The procedure for initial selection of the resonance system parameters is presented. We also consider the possibility of automatic correction by the generator of the LLC system parameters, in order to limit the effect of changes in the IHS parameters on the degree of source–load energy matching. We describe cascade power control algorithms based on the use of Field Programmable Gate Array (FPGA) systems, which enable the optimal control of energy matching. Our study is based on theoretical considerations, numerical simulations, and experimental verification using a 30 kW model.
Highlights
Resonant inverters are currently the dominant group of power sources in industrial induction heating technologies
A typical topology for resonant voltage inverters used in induction heating systems (IHS) is based on a second order LC series resonant system, in which the IHS is an essential part of the inductance and resistance of the resonance circuit
One of the weaknesses of the use of induction heating technology, being an important form of energy conversion in industrial processes, is its low ability to adapt to different types of heated charges
Summary
Resonant inverters are currently the dominant group of power sources in industrial induction heating technologies. 2, the LLC resonance system is and LIHS inductance values (static matching for “cold” charges), and matching during the heating analyzed from the point of view of functional relationships describing the influence of frequency process (dynamic matching). Frequency should be close to the resonance can be obtained by changing the value of series inductance This applies to both f r,d and s order to assure an optimal energy conversion. This was embedded by the Application Programming Interface (API) in our own program, to modify the operating parameters of the resonance inverter in cooperation with various types of resonance systems In this way, source–load cooperation was analyzed in the case of a ferromagnetic steel charge heated in a cylindrical IHS (Figure 5). 2.2 possible, if it2.0can be carried out in a controlled manner, taking into account the change in series the inductance value L1.8 s
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