Abstract
Induction heating provides contactless, energy-efficient, accurate, and fast heating of electrically conductive materials. Due to its advantages, IH is increasingly used in different fields such as industry, medicine, and the household sector. High-frequency transistor converters for the induction heating system are often based on series-resonant inverters. This paper analyzes a phase-shift-controlled voltage-source series-resonant inverter for induction heating systems. Mathematical analysis was performed in order to obtain the expressions that describe the output current of the phase-shift-controlled series-resonant inverter in the steady-state mode. Based on the analysis and the obtained expressions of the output current, analytical expressions of the dead-time between the transistors’ control signals of the SRI are obtained. The analytical expressions for determining the value of the dead-time are obtained for two cases:
 1) zero value of the phase-shift;
 2) the phase shift is greater than zero.
 To verify the obtained analytical expressions of the output current, validation was performed in the MATLAB/Simulink environment by comparing the peak current values.
 The verification showed the high accuracy of the obtained expressions, the deviation between the calculated and simulated values of the peak current is less than 0.1 %. The made simplifications of the dead-time expressions also were verified by calculation, the deviation between the calculated values of the drain-to-source voltage at the end of the commutation and the expected value is no more than 3.6 %. The SRI prototype has been designed and implemented in order to validate the analytical and simulation results
Highlights
The use of voltage-source series-resonant inverters (SRIs) as power supplies for induction heating systems is a very cost-effective solution since regulation of the output current or po wer of the SRI is possible by the SRI itself with using various control methods
This paper presents a mathematical analysis of a phase-shift-controlled series-resonant inverter (PSC-SRI) for induction heating systems
Simulation and calculation results To investigate the validity of the equations obtained by the mathematical analysis in this paper, the applied output voltage of the PSC-SRI to the series-resonant circuit is simulated in MATLAB/Simulink environment
Summary
The use of voltage-source series-resonant inverters (SRIs) as power supplies for induction heating systems is a very cost-effective solution since regulation of the output current or po wer of the SRI is possible by the SRI itself with using various control methods. To achieve high efficiency of the SRI and control over a wide power range, it is sensible to use control methods that can provide zero-voltage switching (ZVS) and/or zero-current switching (ZCS). The PDM control method is widely applied, usually when the SRI load quality factor is high. The reduction in fluctuation achieved is not significant or there is a dc component at the SRI output voltage Another approach to reducing fluctuations is using a converter with a modular topology [16, 17] or an extended topology [18].
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