Achieving High Efficiency Across Load in a 2-Stage 140 W Flyback USB PD 3.1 Compact Notebook Adapter
Conference: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/06/2025 - 05/08/2025 at Nürnberg, Germany
doi:10.30420/566541277
Proceedings: PCIM Conference 2025
Pages: Language: englishTyp: PDF
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Authors:
Manango, Mark Gerald; Saturno, Donnie Rey
Abstract:
Flyback converters are widely used for their simplicity and cost-effectiveness. However, when output power exceeds 100 W, meeting regulatory efficiency requirements for light to full load can be difficult. The primary sources of efficiency losses are switching losses in the primary power switch and conduction losses, particularly due to hard switching. This paper explores methods to reduce switching and conduction losses through component selection and how transformer leakage inductance can improve efficiency. Also, optimizing Zero Voltage Switching (ZVS) at different load points and the use of external circuits to minimize power dissipation at light loads will be explored.