Patent ID: 8410885

Claim:
A combined transformer, comprising: at least three bobbins, each having a first guard plate, a second guard plate, a winding column, a through groove and two first metal pins, wherein the second guard plate is separated from the first guard plate, the winding column is disposed between the first guard plate and the second guard plate, the through groove extends through the first guard plate, the second guard plate and the winding column, the two first metal pins are disposed on the second guard plate, the winding column is wound with a first coil, and two end portions of the first coil are connected to the two first metal pins respectively, wherein the bobbins are arranged abreast, the second guard plate of one of the bobbins is formed with two protrusions, the two end portions are wound around the two protrusions to connect the two first metal pins respectively, so that parts of the two end portions are suspended between the respective first metal pins and the respective protrusions; and a core assembly, having two separated magnetic plates and at least three separated magnetic columns disposed between the magnetic plates, wherein the bobbins are sandwiched between the two magnetic plates, and the magnetic columns are located in the through grooves of the bobbins respectively.