Inverse polarity multilevel Class-DE resonant converter

In this paper, a family of inverse polarity multilevel Class-DE resonant converter with the on-time fixed modulation method is proposed. The proposed inverse polarity multilevel Class-DE resonant converter can convert the positive voltage to negative voltage with the uniform transistor voltage stresses and the uniform diode voltage stresses. Besides, the proposed converter realizes the high active switch utilization. Other strengths of the proposed converter with the on-time fixed modulation method are full output voltage regulation, limited switching frequency range and soft switching of the transistors and diodes. The operation principle and the performance of the proposed converter with the on-time fixed modulation method is explored extensively. Moreover, comparisons among the different methods are carried out to show the superiority of the on-time fixed modulation method. The validity of the theoretical analysis is confirmed by the experimental results.