Presentation Description: Efficiency at both full and light load has become important for power supplies. The European Commission ErP Ecodesign Directive mandates that power devices in “off mode” or “standby” mode must not consume more than 0.5 W, with this limit dropping to 0.3W by 2027. For notebook adapters, "standby" and "off" modes don't necessarily mean zero output load. Application specifications may require power consumption to stay within 300 mW and 500 mW for 150 mW and 250 mW load conditions respectively, even at 20 V or 28 V output. This necessitates optimizing designs not just for full and no-load conditions, but also for “tiny load” and light load scenarios. This paper examines loss distribution across the different power conversion stages and explores the design optimization options that can enhance light load efficiency in AC-DC power converters.
