A High Efficiency Integrated llc Resonant Transformer

Abstract

The invention discloses a high-efficiency integrated LLC resonant transformer. The transformer comprises a magnetic core 1, a framework 2, a magnetic layer of low magnetic permeability 3, a magnetic layer of low magnetic permeability 4, a primary winding 5, a secondary winding 6 and an air gap 7. The air gap 7 is located in the middle column of the magnetic core 1; the magnetic layer of low magnetic permeability 3 tightly wraps the middle column of the magnetic core 1; the primary winding winds around inside the inner layer; the secondary winding winds around the outer layer; the magnetic layer of low magnetic permeability 4 is located between the primary winding 5 and the secondary winding 6. The high-efficiency integrated LLC resonant transformer solves the defects that a traditional LLCresonant transformer is difficult to integrate in a high-power application and the efficiency is reduced, and is capable of not only integrating the resonant inductor and the excitation inductor required by the LLC resonant converter into the transformer, but also reducing the edge effect and the adjacent effect of the transformer, effectively improving the energy transfer efficiency of the transformer.

Description

technical field [0001] The invention relates to the field of power electronics technology and its application, in particular to a high-efficiency integrated transformer applied to an LLC resonant converter. Background technique [0002] As an excellent switching power supply topology with high efficiency, high power density and low EMI, the LLC resonant converter has attracted the attention of scholars and engineers, and has been widely used in communication power supplies, LED power supplies, and electric vehicle charging power supplies. application. LLC resonant transformer, as the core device in LLC resonant converter, is very important to the efficiency, power density and reliability of the circuit. The traditional LLC resonant transformer scheme generally adopts a double-slot skeleton, the primary winding and the secondary winding are respectively wound in two slots, isolated from each other, and there is a large leakage flux, which is used to realize the resonance of ...

AI Technical Summary

Problems solved by technology

The disadvantages of the traditional solution are: the magnetic field around the air gap will produce edge efficiency on the nearby windings or conductors, causing large losses; the double-slot structure causes the window length to be halved, the window utilization rate is reduced, and the number of turns of each layer of winding is reduced. The number of layers in the winding increases, so the proximity effect is significant and the AC resistance loss increases

These shortcomings are more obvious in high-power applications, resulting in difficulties in the magnetic integration of resonance parameters in high-power applications, and the reduction of transformer conversion efficiency, which weakens the advantages of high efficiency of LLC resonant converters.

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