Abstract
This paper shows a high-power resonant converter applied to an induction steel-melting furnace. Resonant DC-DC converters are increasingly used in applications that require high-power density and high-efficiency. At the same time, a control system for the series-resonant converter is introduced in order to reduce the switching power losses. The main advantage of resonant converters is their soft-switching which solves the problem of high-frequency operation. The resonant load topology is also studied and applied. In this way, zero-voltage switching (ZVS) is achieved in the H-bridge converter. This control algorithm aims to achieve its optimum operating point. In this case, the operating frequency in the resonant converter can vary over a wide range during the melting cycle in the induction furnace. The resonant converter has variable frequency control and phase-shift modulation so that the LLC resonant tank can operate at the resonance point in the load. Matlab-Simulink has been the software used to develop the high-power resonant converter, as well as to support the previous analysis. The simulation results obtained are shown in the paper.
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