Design and analysis of series resonant converter for 30kW industrial magnetron

This paper deals with the design and analysis of 42 kW (14 kV, 3 A) high voltage power supply for 30 kW industrial magnetron. The developed high voltage power supply was designed based on the series resonant converter discontinuous conduction mode (DCM) to takes advantage of the superior arc protection because of their current source characteristic. The detail design procedure for resonant tank and high voltage transformer with respect to the input and output specifications is described based on the basic analysis of DCM series resonant converter. A comparative study with theoretical equations, simulation and experimental results was given. It provides the output voltage and current characteristics with variable switching frequency and verifies the advantage of this topology such as the function of arc protection without any additional protection circuit and high efficiency because of the zero current or zero voltage switching. Also, the developed power supply was tested with 30 kW magnetron and the results prove the reliability and robustness of proposed scheme.