Automatic Current Sharing of Paralleled Windings for LLC Resonant Converter With Secondary-Side Resonant Inductors
- Resource Type
- Periodical
- Authors
- Liu, Y.; Wu, H.; Wang, Y.; Ji, G.; Zhang, Z.
- Source
- IEEE Transactions on Power Electronics IEEE Trans. Power Electron. Power Electronics, IEEE Transactions on. 38(11):13594-13598 Nov, 2023
- Subject
- Power, Energy and Industry Applications
Aerospace
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
General Topics for Engineers
Nuclear Engineering
Signal Processing and Analysis
Transportation
Inductors
Transformers
Magnetic resonance
Windings
Magnetic separation
Magnetic flux
Resonant converters
Current balance
high frequency
magnetic integration
resonant converter
- Language
- ISSN
- 0885-8993
1941-0107
The current sharing issue of paralleled secondary windings of the transformer is a major concern of LLC resonant converters. Matrix transformers solve this issue by connecting primary windings in series and secondary windings in parallel, but the volume and loss of magnetic cores increase dramatically. This letter proposes a modified LLC resonant converter, which can achieve automatic current sharing of secondary windings by distributing the resonant inductor to each secondary winding. Theoretical analysis indicates that the current balance of each paralleled secondary winding only depends on the inductance of distributed resonant inductors, whereas the tolerance of resonant inductors can be guaranteed easily in practice. An experimental prototype is built and tested to verify the effectiveness of the proposed method.