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提出一种用于IoT设备的离线电源转换器，包含电容降压AC-DC整流器和全占空比输入串联双支路DC-DC转换器，实现了宽输入输出范围下的高效转换。通过全占空比操作将电压转换比降至D/2，有效减小了电容体积和器件电压应力，达到87.2%峰值效率、2.15W输出功率和1088mW/cm³功率密度。
Abstract This paper presents a 120V/230Vac to 5-to-12Vdc offline power converter consisting of a capacitor-drop AC-DC rectifier and a full-duty-cycle input-series dual-branch DC-DC converter for IoT devices. The proposed converter operates at full-duty-cycle with VCR of D/2 and reduces both the CREC volume and the voltage stress on components, while achieving high efficiency across a broad input and output voltage range. 87.2% peak efficiency, 2.15W output power, and 1088mW/cm3 power density are achieved. The rapid growth of Internet of Things (IoT) devices and sensors in smart home systems has increased the demand for efficient and compact offline power converters that transfer power from the AC mains to low DC voltages. Traditional offline power converters are typically implemented with isolated flyback [1] or forward [2] topologies, which require bulky transformers to step down the AC voltage (120/230VRMS), limiting the power density
Gang Liu1,2, Junmin Jiang2, Sijun Du3, Xun Liu1
Chinese University of Hong Kong, Shenzhen, China, 2Southern University of Science and Technology, Shenzhen, China, 3TU Delft, Delft, The Netherlands