Transformer with safety creepage distance

Abstract

The invention relates to a transformer provided with a safe creepage distance, comprising at least one E-shaped iron core (1). A cylinder-shaped coil bracket (2) made of insulation material is sleeved on a central column (11) of the iron core (1). A coil (3) is winded on the coil bracket (2). An insulation jacket (4) is respectively and oppositely arranged on two sides of the central column (11) of the E-shaped iron core (1). The insulation jacket (4) looks as an L shape from a side-glance, two sides and a bottom side of which are all provided with outer-raised sides (41) are respectively attached to corresponding side faces of a side column (12) and a bottom side (13) of the E-shaped iron core (1). Compared with the prior art, the length of the insulation jacket of the invention does notneed to be strictly matched with the length of the bottom side of the E-shaped iron core and the insulation jacket can just be positioned between the central column and the side column; and the necessary processing of a central through hole in the original components can be avoided, therefore, the structure of the insulation jacket can become simpler, and then not only materials can be conserved but a bulk manufacture can be realized more easily and an actual product qualified rate is largely raised.

Description

technical field [0001] The invention relates to a small transformer, in particular to a transformer with a safe creepage distance. Background technique [0002] A transformer is a static electrical device that transforms voltage or current between two or more windings at the same frequency by means of the principle of electromagnetic induction. Transformers are an indispensable component of various electronic products. At present, electronic products are becoming more and more lightweight and designed, so that the size of transformers is also required to be relatively reduced. In this way, the demand for small transformers is increasing day by day. Wherein, the small switching power supply transformer generally includes a coil support made of insulating material, a coil wound on the coil support and an iron core wrapped outside the coil. In safety standards, there is a safe creepage distance standard for transformers, that is, there is a certain creepage distance between th...

AI Technical Summary

Problems solved by technology

In this transformer, the insulating bush in the shape of "concave" needs to be adapted to the bottom and side columns of the E-shaped iron core due to the length of the bottom side and the distance between the two sides, and the outer side of the insulating bush The width of the flange determines the creepage distance of the transformer, and the central through hole of the insulating bush needs to match the central column of the E-shaped iron core for the central column to pass through. These factors make the insulating bushing The size and shape of the processing requirements are very precise. Originally, the size of the insulating bush is relatively small in the small transformer, so the production and processing requirements of the insulating bush have become very high. The actual product qualification rate is low, so it needs to be developed further improvement

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