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Technical Dialogue

Hard- and Soft-Switched

D04.12 - Dimensional Parasitics Absorption in Capacitively-Isolated Ćuk Converter for Medium-Voltage High Step-Down Converters

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
This paper presents the capacitively-isolated ´Cuk converter (CI´CC) as a high step-down solution for modular medium-voltage converter. The CI´CC effectively absorbs parasitics, enabling seamless integration into input-series output-parallel (ISOP) architectures, with solid-state transformers (SSTs) as a notable example. It fully utilizes the dielectric for both insulation and energy transfer, thereby supplanting transformer-based cells in SSTs. Additionally, this work demonstrates a reduction in the size of the blocking capacitor required for zero-voltage switching (ZVS) in the converter stage. The proposed topology’s effectiveness is validated using a custom-packaged 2 kV-to-400 V, 50 kW co-axial modular converter operating at 100 kHz, featuring a power density of 8 MW/m3.