Transformer capable of controlling number of coils

The transformer comprises a primary coil, a plurality of secondary coils with different turns, a magnetic core and a silicon controlled rectifier, the primary coil and the secondary coils are wound on the magnetic core, and the primary coil is connected with the different secondary coils in series through the silicon controlled rectifier. The primary coil of the transformer is connected in series with the secondary coils with different numbers of turns through the silicon controlled rectifier to output different voltages, and the transformer capable of controlling the number of the coils is arranged in the resistance spot welding machine, so that the resistance spot welding machine can apply different voltages to a weldment so as to better meet different operation requirements; therefore, the welding quality of the weldment is well ensured. 本发明公开了一种可控制线圈数量的变压器，包括初级线圈、多个不同匝数的次级线圈、磁芯以及可控硅，初级线圈与次级线圈均缠绕在磁芯上，初级线圈通过可控硅与不同的次级线圈串联。本发明变压器的初级线圈通过可控硅与不同匝数的次级线圈串联以输出不同的电压，该可控制线圈数量的变压器为设置于电阻点焊机中，使得电阻点焊机能够对焊件施加不同的电压，以较好地应对不