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    External AC-DC Adapters

    D01.4 - A new system to reduce standby losses in compact GaN-based digital adapter

    Thursday, March 26, 2026
    12:00 PM - 1:45 PM CT
    Location: Poster 1
    The continuous increase in grid-connected electronic apparatus has made the reduction of standby power consumption mandatory. While achieving low power consumption in electronic systems with analog controllers it relatively straightforward, standby power in digitally controlled systems suffers from higher circuit complexity. The advantages of digital systems are in the advanced control techniques that can often improve the conversion efficiency of a system. This paper presents two methods and related circuits to reduce standby power in a digitally controlled ac-dc converter. The converter consists of a totem-pole ac-dc Power Factor Corrector and a dc-dc resonant LLC stage. Both stages are controlled by a single microcontroller. Test results demonstrate the effectiveness of the proposed method with standby losses below 150 mW, meeting the CoC V5 Tier 2 (2019/1782) standard in digital adapters.