Patent ID: 8570134

Claim:
A transformer, comprising: a bobbin part including a plurality of bobbins, each including a pipe shaped body part having a though-hole formed in an inner portion thereof, a flange part vertically protruding outwardly from both ends of the body part, and external connection terminals protruding from one side of a lower flange part formed at a lower end of the body part; a core disposed in the through-hole of the bobbin to thereby form a magnetic path; and a coil part including coils each wound around the plurality of bobbins, wherein: the bobbin part includes an inner bobbin and an outer bobbin, and the inner bobbin is coupled to the outer bobbin such that the external connection terminals of the inner bobbin and the external connection terminals of the outer bobbin are opposed to each other, each of the plurality of bobbins includes a terminal connection part protruding downwardly from one side of the lower flange part and having a plurality of external connection terminals connected thereto, and the external connection terminals of the inner bobbin are connected to the terminal connection part of the inner bobbin along an outer peripheral edge of the lower flange part of the inner bobbin.