high frequency transformer

Abstract

The invention discloses a high-frequency transformer which comprises a framework, a primary winding, a secondary winding and a main magnetic core. The framework comprises two main magnetic core accommodating portions, the outer walls of the two main magnetic core accommodating portions are a primary winding portion and a secondary winding portion respectively, and the primary winding portion and the secondary winding portion are respectively wound on the two main magnetic core accommodating portions. The main magnetic core comprises two winding magnetic posts, and the winding magnetic posts are respectively located in the two main magnetic core accommodating portions. The high-frequency transformer further comprises a flux leakage core, and the flux leakage core is parallel to the two winding magnetic posts. By arranging the flux leakage core, an effect is produced on magnetic force lines in the primary winding, the secondary winding and the main magnetic core in the high-frequency transformer to form a bypass magnetic path, and accordingly leakage inductance is increased. When a resonant type power supply is produced, an additional independent inductor is not needed, production processes are decreased, and wire arrangement complexity is reduced.

Description

technical field [0001] The invention relates to the field of transformers, in particular to transformers used in high-frequency electronic circuits. Background technique [0002] In the application of high-frequency switching power supply, especially in the resonant conversion topology, it is necessary to use a resonant inductor and a transformer. There are two commonly used design methods: [0003] 1. Using traditional transformers and independent resonant inductors will complicate the structure of the power supply, increase the volume, complicate the wiring of the PCB board, and cause large electromagnetic interference. Lead to low product efficiency, large volume, and high cost. [0004] 2. Simply integrate the resonant inductor into the transformer, and use it as a resonant inductor by increasing the leakage inductance of the transformer. Usually by changing the distance between the primary and secondary windings to change the leakage inductance of the transformer to ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a high-frequency transformer with a combined resonant inductance (leakage inductance), which can solve the problems that the existing resonant power supply needs to add an independent inductance, complex design, and large volume

It can also solve the existing problem of increasing the leakage inductance by increasing the distance between the primary and secondary windings, which is difficult to meet the needs of the application.

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