High step‐up dc‐dc converter based on the differential connection of basic converters and switched‐capacitor cells

• Published in: International journal of circuit theory and applications Vol. 49; no. 8; pp. 2555 - 2577
• Main Authors: Andrade, Jessika M., Coelho, Roberto F., Lazzarin, Telles B.
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01.08.2021
• Subjects: Basic converters; Capacitors; differential connection; Energy conversion efficiency; high gain step‐up dc‐dc converters; positive group converter; single‐phase converter; switched‐capacitor cells; Voltage converters (DC to DC); Voltage gain
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.3003

Summary This paper proposes a differential connection between the conventional boost and the mirrored SEPIC converters and the combination of them using switched‐capacitor cells. The integration results in a single stage power structure that provides high‐voltage gain and high efficiency. The article approaches a detailed static‐dynamic analysis and a comparison in relation to other structures presented in the literature. In addition, to corroborate the theoretical analysis and the operation stages of the proposed converter, a 200 W prototype, with a switching frequency at 50 kHz, an output voltage from 300 to 400 V and an input voltage of 20 V, is evaluated. An efficiency peak of 96.78% was reached at 100 W. This paper proposes a differential connection between the conventional boost and the mirrored SEPIC converters and the combination of them using switched‐capacitor cells. The integration results in a single‐stage power structure that provides high‐voltage gain and high efficiency. The article approaches a detailed static‐dynamic analysis and a comparison in relation to other structures presented in the literature. In addition, to corroborate the theoretical analysis and the operation stages of the proposed converter, a 200 W prototype is evaluated.