Ferudun GÖKÇEGÖZ, Erdem AKBOY, A. Hülya OBDAN

Analysis and Design of a Flyback Converter for Universal Input and Wide Load Ranges

Flyback converters exhibit the advantages of simple structure, low cost, small volume, isolation, and control simplicity. However, flyback converters demonstratedisadvantages like leakage inductance; hence, losses are incurred. Losses pertain to the requirement of an external cooling system and external costs. It also resultsin low efficiency and the use of flyback converters in low-power applications. The discontinuous conduction mode (DCM) is used for low-power applications toachieve efficiency. In flyback converters, the reverse recovery losses of the diode are eliminated with DCM. There are many applications of flyback converters inindustrial systems, such as led drivers, battery charge systems, telecommunication systems. In this study, analysis and design of a flyback converter for universalinput and wide load ranges was performed. The detailed theoretical analysis was conducted and verified with the implementation of a DCM flyback converterfor 85 V-265 V RMS AC input voltage, 12 Vo output, 100 kHz switching frequency, and 48 W output power. The overall efficiency of the proposed converter atfull load was measured as 81%. Additionally, external cooling systems were not required, which highlighted the development of a compact design with smallvolume and ease of application for an industrial system that requires the inclusion of more serial flyback converters.

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