Author_Institution :
Inf. Technol. & Electron. Res. Inst., TUBITAK Bilten, Ankara, Turkey
Abstract :
The analysis, design, and implementation of an active clamped ZVS forward converter equipped with a soft-switched synchronous rectifier (ACFC-SR), proposed for high-efficiency low output voltage DC-DC converter applications, is presented. The converter efficiency is maximised due to soft switching of the main, active clamp, synchronous rectifier, and freewheeling MOSFET switches. The operating principles of the ACFC-SR are analysed in detail, and the converter performance is compared with that of alternative forward converter schemes employed in low output voltage DC-DC converters, in view of their power conversion efficiency. Experimental results are presented for a 50 W ACFC-SR converter with a DC input voltage of 48 V, an output voltage of 5 V, and operating at a switching frequency of 120 kHz. In general, good agreement is observed between the theoretical and experimental results.
Keywords :
AC-DC power convertors; DC-DC power convertors; field effect transistor switches; power MOSFET; power semiconductor switches; rectifying circuits; switching convertors; 120 kHz; 48 V; 5 V; 50 W; active clamped ZVS forward converter; freewheeling MOSFET switches; high-efficiency low output voltage DC-DC converter; operating principles; power conversion efficiency; soft switching; soft-switched synchronous rectifier; switching frequency;
