Power supply units (PSUs) are essential components of electronic devices, including power adapters, server power supplies, communication power supplies, network security power supplies, industrial control power supplies, and power battery chargers. Regardless of whether these products are used intermittently, cyclically, or for 24/7 systems, quality and reliability are crucial. In response to the trend of energy saving and carbon reduction, global regulations on power consumption and energy efficiency for power supplies are becoming increasingly stringent. For instance, the EU’s CoC V5 and the US’s DoE Tier 6 energy efficiency standards have raised requirements for power supply efficiency and standby power consumption. These regulations not only drive technological innovation in the power supply industry but also promote the development of high-efficiency and energy-saving power supply products.