Abstract
This paper analyzes and develops a multi-variable & multi-constraint design optimization approach with the goal of minimizing power losses in a 2 MHz LLC resonant converter for next-generation data center applications. For a thorough co-design of a multi-MHz resonant converter, intricately curated performance constraints and associated design-based trade-offs are presented. In addition, accurate characterization, and parametric minimization of the AC resistance by optimal selection of transformer winding configuration, while achieving a controllable leakage flux for the resonant inductor integration into the high frequency planar transformer (HFPT) thereby reducing the effective winding losses by 6%. An all-GaN based 700 W, high power density (6.2 W/cm3) experimental proof-of-concept was built for a conversion from a variable input bus voltage (380-420 V) to 12 V stiff output at a resonant frequency of 2 MHz. The results portrayed a steady state peak efficiency of 95.65%, with an improvement of 2.2% over the state-of-the-art (SOA) operable at MHz frequency.
Original language | English (US) |
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Pages (from-to) | 259-272 |
Number of pages | 14 |
Journal | CPSS Transactions on Power Electronics and Applications |
Volume | 7 |
Issue number | 3 |
DOIs | |
State | Published - Sep 1 2022 |
Externally published | Yes |
Keywords
- Datacenters
- LLC resonant converter
- gallium nitride (GaN)
- loss minization
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Renewable Energy, Sustainability and the Environment
- Control and Systems Engineering