This paper presents a novel control strategy to improve the performance of single-stage flyback inverters. Although the conventional hybrid operation of boundary conduction mode (BCM) and discontinuous conduction mode (DCM) is employed, the key innovation lies in the integration of quasi-resonant (QR) control based on a current prediction calculation method. This approach enables valley switching of the primary switches, reducing switching losses and enhancing efficiency without requiring additional power devices, current sensors, or auxiliary circuits. Furthermore, the method ensures that the magnetizing current starts at zero in every half cycle, thereby preventing low-frequency harmonic distortion in the output current. The effectiveness of the proposed control strategy is validated through experiments on a 500-W interleaved flyback microinverter.

Leia Mais: https://ieeexplore.ieee.org/abstract/document/11259846