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Hard- and Soft-Switched

T33.3 - A 30-60V Input 6V Output Regulated Resonant SC Converter with Unified Hard-Soft Switching Control Achieving 100A and 1339W/in³ for High-Performance Computing

Thursday, March 26, 2026
11:00 AM - 11:20 AM CT
Location: 214A
For high-performance computing XPUs, the 48 V intermediate bus converter (IBC) architecture has emerged as the industry standard, fueled by the surging power needs of data centers. A regulated resonant switched-capacitor (R²SC) converter is presented, supporting a 30–60 V input and achieving a 48-to-6 V conversion ratio for next-generation intermediate bus converters (IBC). Bulky high-voltage DC decaps are eliminated through accurate frequency alignment enabling zero-current switching (ZCS). A unified hard–soft switching control (UHSC) autonomously tracks optimal ZCS timing across wide input and load ranges, reducing decoupling capacitance while preserving regulation. Prototypes deliver 6 V at 100 A with 95.6 % efficiency and 1339 W/in³ power density. The proposed design combines wide-range operation, high efficiency, and compact form factor, making it well-suited for high-performance computing (HPC) power delivery.