A 110V/230V 0.3W Offline Chip-Scale Power Supply with Integrated Active Zero-Crossing Buffer and Voltage-Interval-Based Dual-Mode Control

This paper presents an efficient and compact offline chip-scale power supply in 0.18μm high-voltage (HV) silicon-on-insulator (SOI) technology, suitable to supply IoT nodes, sensors, RF transceivers, LED strings, etc. from the 120/230V AC mains (Fig. 14.2.1). Main innovations include a voltage-interval-based dual-mode AC-DC conversion and an active zero-crossing buffer in the AC interface, which significantly reduces the size of the HV buffer capacitor
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and enables on-chip integration. The converter supports both AC-DC and DC-DC conversion with an input voltage range of 15 to 325V.