Transformer

A transformer for adjusting an input voltage via a microcontroller, comprising:

• a winding frame having a jack, at least one primary winding area, at least one secondary winding area, at least one feedback winding area, and at least two disposed areas, wherein the at least one feedback winding area is placed on a first side of the at least one primary winding area and a first side of the at least one secondary winding area, the at least two disposed areas are respectively placed on a second side of the at least one primary winding area and a second side of the at least one secondary winding area;
• at least one primary coil assembly, wound around the at least one primary winding area and electrically connected to the microcontroller via at least one first conductive terminal, being configured to receive the input voltage;
• at least one secondary coil assembly being wound around the at least one secondary winding area;
• and
• at least one feedback coil assembly, wound around the at least one feedback winding area and electrically connected to the microcontroller via at least one second conductive terminal, being configured to output an induced voltage to the microcontroller via the at least one second conductive terminal so that the microcontroller adjusts the input voltage received by the at least one primary coil assembly according to the induced voltage.