Patent ID: 8471664
Filing Date: 2013-06-25
Classification: H01F

Abstract:
1. A transformer without coil racks mounted onto a circuit board, comprising: a winding set including a coil portion which is located above the circuit board and includes a plurality of predetermined number of coils, and a magnetic core set running through the coil portion, the coil portion including a conductive wire with two ends electrically connected with the circuit board and an insertion passage formed by winding of the conductive wire to allow the magnetic core set to pass through; the magnetic core set including at least one inner magnetic core portion running through the insertion passage and at least two outer magnetic core portions at two sides of the inner magnetic core portion, the inner magnetic core portion being spaced from the two outer magnetic core portions by a gap; a plurality of conductive plates straddling the coil portion, each of the plurality of conductive plates at least including a connecting section to cover a top side of the coil portion, two extended arms connected to two ends of the connecting section and running through the gap, and two connection pins extended from the two extended arms to connect to the circuit board; and an insulation mounting sheet which is interposed between the connecting section and the coil portion, and includes a plurality of retaining slots corresponding to the gap to allow the two extended arms to pass through and a plurality of retaining portions each being formed between two neighboring retaining slots to confine the extended arms from contacting each other, the conductive plates running through the plurality of retaining slots and being confined by the plurality of retaining portions from moving.