一种具有宽负载范围、自驱动同步整流和零纹波输出电流的全软开关半交错超高压降比变换器

In industrial dc-dc power conversion applications, achieving high efficiency and small size in converters is crucial. To address these issues, this article introduces a novel semiinterleaved non-isolated topology by employing coupled inductors and a valley-fill structure. This method ensures continuous output current with zero-ripple, which reduces the size of the output filter. Additionally, by implementing soft switching techniques, the converter can operate at higher frequencies and accommodate a wide range of load variations. The utilization of a pulse frequency modulation (PFM) controller sustains zero-voltage switching (ZVS) and improves the conversion ratio by changing frequency. Also, self-driven synchronous rectifiers (SRs) turn ON and OFF under ZVS circumstances, and valley-fill diodes turn OFF under zero-current switching (ZCS) conditions, thereby lowering switching, diode, and reverse recovery losses, ultimately enhancing converter efficiency. A 300-V to 24-V/12-A prototype of the proposed converter is implemented to verify the performance and the theoretical analysis which results in efficiency higher than 97% from full load to light load.