Design and development of a fractional-turn transformer for high power density LLC resonant converters
Journal
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Pages
335-342
Date Issued
2021
Author(s)
Abstract
This study proposes a 48 V - 6 V isolated direct current DC-DC converter using an LLC series resonant converter with wide bandgap GaN components under a 1-MHz switching frequency. A loss analysis was performed on different primary circuit structures for the converter, and a full-bridge structure was selected. In addition, a quarter-turn planar transformer structure was adopted. With the voltage conversion ratio of 8:1 unchanged, the adopted transformer required fewer primary and secondary winding turns, with lower alternating current copper losses, compared with an average transformer. The study also explored and optimized parallel arrangements of transformer windings, adopted parametric design of transformer dimensions, and determined the optimal balance between core losses and copper losses in a limited circuit area. The magnetic simulation software Ansys Maxwell was used to verify the magnetic flux distribution of the quarter-turn planar transformer. An experiment confirmed that the proposed LLC series resonant converter has a switching frequency, input voltage, output voltage, output power, power density, and peak efficiency of 1 MHz, 48 V, 6 V, 900 W, 63 W/cm3, and 98.2%, respectively. ? 2021 IEEE.
Event(s)
36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Subjects
48 V voltage regulation module
Fractional-turn transformer
GaN
High power density
Computer software
Copper
DC-DC converters
Gallium nitride
Power electronics
Transformer windings
Voltage regulators
Wide band gap semiconductors
Winding
Copper loss
Design and Development
High-power-density
LLC resonant converter
Planar transformer
Series resonant converters
Voltage output
Voltage regulation modules
III-V semiconductors
SDGs
Type
conference paper