Shunt-inserted transformers are widely used toobtain high leakage inductance. This paper investigates thismethod in depth to make it applicable to integrate resonantinductor for the LLC resonant converters. The analysis andmodel of magnetizing inductance and leakage inductance forshunt-inserted planar transformers with and without air gaps arepresented. Magnetic shunt permeability and thicknesssignificantly affect the magnetizing inductance and leakageinductance. Air gaps in traditional transformers only have aslight influence on the leakage inductance. However, air gaps inshunt-inserted planar transformers can provide a significantdifference. The way to obtain the desirable magnetizing andleakage inductance value for LLC resonant converters issimplified by the creation of air gaps together with a magneticshunt. The calculation and relation are validated by finiteelement analysis (FEA) simulations and experimentalmeasurements. AC resistances for the shunt-inserted planartransformers are discussed and three transformers with the samemagnetizing inductance are selected for comparison. The resultsindicate that the magnetic shunt can in some extent minimizefringing effects.
|Title of host publication||Proceedings of the 43rd Annual Conference of the IEEE Industrial Electronics Society (IECON 2017)|
|Publication status||Published - 2017|
|Event||43rd Annual Conference of the IEEE Industrial Electronics Society - China National Convention Center, Beijing, China|
Duration: 29 Oct 2017 → 1 Nov 2017
|Conference||43rd Annual Conference of the IEEE Industrial Electronics Society|
|Location||China National Convention Center|
|Period||29/10/2017 → 01/11/2017|