Transformer and assembly method thereof

Abstract

The invention provides a transformer, which comprises a magnetic core, a primary power winding, a secondary power winding and a shielding winding, wherein the magnetic core comprises an upper magneticcore and a lower magnetic core; a wrapping post of the upper magnetic core is matched with the wrapping post of the lower magnetic core in a manner of position correspondence to form a magnetic coreshaft column; each magnetic core shaft column is sleeved with the primary power winding, the secondary power winding and the shielding winding; the shielding winding comprises a primary shielding winding and a secondary shielding winding; and the primary shielding winding and the secondary shielding winding are stacked up and down and the spacing distance is h. According to the transformer, a lowresistance return channel is provided for primary noise coupled to a secondary side through adding the shielding winding and replacing a crossover Y capacitor to solve the problem of EMC; the cost andthe volume of the transformer can be reduced; and a hidden danger of leakage current is avoided.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to a transformer and a manufacturing method thereof. Background technique [0002] With the rapid development of mobile Internet and terminal technology, the popularity of portable electronic products including communication terminals and wearable devices. People's requirements for the miniaturization, cost and safety of adapters for charging portable electronic products are also getting higher and higher. [0003] Most adapters use flyback converters to realize ACDC conversion. The transformer is one of the key components of the converter; however, the current applied transformers are mainly traditional wire-wound transformers, which are large in size, not conducive to miniaturization, and have complex internal structures and high processing costs. [0004] The parasitic parameters between the windings of traditional wire-wound transformers are large and difficult to control...

AI Technical Summary

Problems solved by technology

[0005] However, the technical solution of introducing Y capacitors to solve the EMC problem has the following disadvantages: the imported Y capacitors are large in size and occupy a large space, which is not conducive to the miniaturization of the adapter; The cost of the Y capacitor is higher, which increases the cost of the adapter;

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