Transformer and power supply device using same

Abstract

The present invention relates to a transformer and a power supply device using same, the transformer being capable of reducing the occurrence of defects due to a core shrinkage phenomenon during a curing process of a bonding liquid. The transformer according to the present invention may comprise: a core part including an upper core and a lower core which are coupled to face each other; and a bobbin which is at least partially disposed between the upper core and the lower core, wherein the upper core and the lower core comprises: a body part in the form of a flat plate; and a plurality of legs formed by protrusion parts protruding from the body part in a thickness direction and extending along one axial direction, and the protrusion parts form a predetermined proportional relationship with the body part and have different thicknesses, so that the thicknesses of the protrusion parts and rear surfaces of the upper core and the lower core can be designed at an optimal ratio, and thus the occurrence of a warpage phenomenon of the cores can be prevented during a curing process after bonding and during operation.

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