Integrated LLC transformer

Abstract

The invention provides an integrated LLC transformer. The integrated LLC transformer comprises a primary coil, a secondary coil, a framework and a magnetic core, the framework comprises a magnetic core channel, and the magnetic core is arranged in the magnetic core channel. The integrated LLC transformer is characterized in that the primary coil comprises a first part coil, a second part coil anda connection part coil, the connection part coil is connected with the first part coil and the second part coil separately, and a first containing part, a second containing part and a third containingpart are arranged at the exterior of the magnetic core channel; a first insulation part and a second insulation part are further arranged at the exterior of the magnetic core channel, the first insulation part is located between the first containing part and the second containing part, and the second insulation part is located between the second containing part and the third containing part; thefirst part coil is arranged on the first containing part, the second part coil is arranged on the third containing part, and the secondary coil is arranged on the second containing part. The integrated LLC transformer has the advantages that the magnitude of leakage inductance can be adjusted, and the stability is good.

Description

technical field [0001] The present invention relates to the field of transformers, in particular to integrated LLC transformers. Background technique [0002] In order to facilitate the resonance debugging and stability of the entire power supply, a general resonance circuit is added with a resonance inductor and capacitor to adjust the resonance circuit. see figure 1 , the existing LLC resonant transformer includes a resonant circuit 4, the resonant circuit 4 includes a capacitor C1, a resonant inductor L1 and a transformer 6, the capacitor C1 is connected in series with the resonant inductor L1, and the resonant inductor L1 is connected in series with the transformer 6, through the capacitor C1, the resonant inductor L1 and The resonance between the inductances in the transformer 6 forms a resonant circuit 4 for frequency adjustment to achieve a constant output voltage. However, this will make the structure of the power supply complicated, the volume increased, the elect...

AI Technical Summary

Problems solved by technology

However, due to the large resonance inductance required for resonance, the leakage inductance of the transformer is often very small. Usually, the distance between the primary coil and the secondary coil is increased, so that the coupling coefficient between the primary coil and the secondary coil becomes smaller, achieving an increase. The purpose of large leakage inductance, but this will often make the volume of the transformer larger and the magnetic coupling capability poor

[0004] The existing technology also has a solution to increase the leakage inductance of the transformer by adding a magnetic core between the primary coil and the secondary coil. For example, the Chinese invention patent application CN201610995019.3 discloses a method by adding a A leakage magnetic core forms a side branch magnetic flux, thereby increasing the leakage inductance, but the leakage inductance is not easy to adjust in this way

Images