Latest Development of Transformer Parasitic Parameters and Lossless Inductive Snubber-Assisted ZCS-PFM DC-DC Converter For Microwave Power Generation

The conventional series-resonant power frequency modulated DC-DC converter with a high-frequency high-voltage transformer link designed for driving the magnetron of microwave ovens has the problem of the hard switching commutation at turn-on and turn-off of the active power switching devices due to the influence of the magnetizing current of the high-frequency transformer. This paper presents a novel prototype of high-frequency transformer parasitic parameters with a lossless inductive snubber and a series resonant capacitor assisted series-resonant zero current switching pulse frequency modulated DC-DC power converter, which is designed for industrial use of high power magnetron for microwave ovens. In order to implement a complete and efficient soft switching commutation, the performance of the new converter topology is practically confirmed and evaluated in the prototype of power microwave generator from a practical point of view