Transformer used for reducing electromagnetic interference influence and applicable power switching circuit thereof

Abstract

The invention relates to a transformer used for reducing electromagnetic interference influence and an applicable power switching circuit thereof. The transformer at least comprises a winding base, amagnetic core group partially penetrating the winding base, a first primary winding wound on the winding base and composed of a first winding part and a second winding part, a secondary winding woundon the first primary winding, and a first screening element arranged between the first primary winding and the secondary winding to be used for preventing the electromagnetic interference of the firstprimary winding from being conducted to the secondary winding, wherein the electromagnetic interference of the first winding part is larger than that of the second winding part; the first winding part of the first primary winding is arranged near the magnetic core group so as to screen the electromagnetic interference of the first winding part by the magnetic core group; the second winding part is wound on the first winding part and is adjacent to the secondary winding so as to increase the electromagnetic coupling efficiency of the first primary winding and the secondary winding. The invention can reduce the influence the electromagnetic interference to the transformer, thereby enabling the transformer to reduce leakage inductance, and therefore, the converting efficiency is improved.

Description

technical field [0001] The invention relates to a transformer, in particular to a transformer for reducing the influence of electromagnetic interference and a suitable power conversion circuit thereof. Background technique [0002] Transformers are electronic components often used in various electrical equipment. see figure 1 , which is a structural schematic diagram of a known transformer. Such as figure 1 As shown, the transformer 1 mainly includes a magnetic core assembly 11 , a bobbin base 12 , a primary winding 13 and a secondary winding (not shown). Wherein, the primary winding 13 and the secondary winding are sandwich wound in the winding area of ​​the winding base 12, that is, the primary winding 13 is divided into two parts and the secondary winding is covered therein. , and two adjacent positions of the primary winding 13 and the secondary winding are insulated and separated from each other by tape. The magnetic core group 11 is usually an EE type magnetic cor...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a transformer for reducing the influence of electromagnetic interference and its applicable power conversion circuit, to solve the problem that the primary winding is repeatedly switched due to the switching element when the known transformer is applied to the power conversion circuit and is electrically connected to the switching element The generated electromagnetic interference will affect the electromagnetic coupling rate between it and the secondary winding, which will reduce the operating efficiency of the transformer

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