Conference paper
Analysis and modeling of integrated magnetics for LLC resonant converters
Shunt-inserted transformers are widely used to obtain high leakage inductance. This paper investigates this method in depth to make it applicable to integrate resonant inductor for the LLC resonant converters. The analysis and model of magnetizing inductance and leakage inductance for shunt-inserted planar transformers with and without air gaps are presented.
Magnetic shunt permeability and thickness significantly affect the magnetizing inductance and leakage inductance. Air gaps in traditional transformers only have a slight influence on the leakage inductance. However, air gaps in shunt-inserted planar transformers can provide a significant difference.
The way to obtain the desirable magnetizing and leakage inductance value for LLC resonant converters is simplified by the creation of air gaps together with a magnetic shunt. The calculation and relation are validated by finite element analysis (FEA) simulations and experimental measurements. AC resistances for the shunt-inserted planar transformers are discussed and three transformers with the same magnetizing inductance are selected for comparison.
The results indicate that the magnetic shunt can in some extent minimize fringing effects.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2017 |
| Pages: | 834-839 |
| Proceedings: | IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society |
| ISBN: | 1538611260 , 1538611279 , 1538611287 , 9781538611265 , 9781538611272 and 9781538611289 |
| Types: | Conference paper |
| DOI: | 10.1109/IECON.2017.8216144 |
Air gaps Inductance LLC LLC resonant converters air gap air gaps finite element analysis integrated magnetics leakage inductance magnetic shunt magnetic shunt permeability magnetizing inductance power inductors resonant inductor resonant power convertors shunt-inserted planar transformers transformer transformer windings
