Printed circuit board module

A printed circuit board module comprising:

• a first printed circuit board;
• a second printed circuit board disposed on one surface of the first printed circuit board;
• a third printed circuit board disposed on the other surface of the first printed circuit board;
• and
• a core penetrating through the first to the third printed circuit boards,
• wherein the second printed circuit board includes a first coil,
• wherein the third printed circuit board includes a second coil,
• wherein the cross-sectional area of the second printed circuit board and the third printed circuit board is smaller than the cross-sectional area of the first printed circuit board,
• wherein the first printed circuit board includes a first hole and a second hole into which a portion of the core is being inserted,
• wherein the second printed circuit board is disposed between the first hole and the second hole,
• wherein each of the first printed circuit board, the second ted circuit board, and the third printed circuit board includes a hole,
• wherein a rivet through the hole,
• wherein the first printed circuit board, the second printed circuit board and the third printed circuit board are electrically connected to each other through the rivets, and
• wherein at an upper end and a lower end of the river, engaging portions for engaging the second printed circuit board and the third printed circuit board a respectively disposed.