SLIM MAGNETIC COUPLING DEVICE WITH STABLE WITHSTANDING VOLTAGE CHARACTERISTICS

A magnetic coupling device according to an embodiment of the present invention comprises: a first bobbin including an upper surface, a lower surface facing the upper surface, and an outer surface disposed between the upper surface and the lower surface, a groove portion which is disposed on the inner side of the outer surface and is concave from the upper surface toward the lower surface, and a first terminal portion and a second terminal portion which are disposed on the outer surface and spaced apart from each other in a first direction; a second bobbin disposed on the groove portion and accommodating a magnetic substance core; and a first coil and a second coil which are wound on the second bobbin and spaced apart from each other in the first direction, wherein the first coil includes a first winding portion wound on the second bobbin, and a first extension portion extending from the first winding portion onto the outer surface of the first bobbin and coupled to the first terminal portion, and the second coil includes a second winding portion wound on the second bobbin, and a second extension portion extending from the second winding portion onto the outer surface of the first bobbin and coupled to the second terminal portion.