A voltage conversion device, comprising: a noise source; a common mode impedance regulator and an electromagnetic interference filter, wherein the common mode impedance regulator comprises an E-E magnetic core, a first coil, a second coil, a balanced winding coil, and a variable resistor, wherein the E-E magnetic core comprises a first magnetic cylinder, a second magnetic cylinder, and a central cylinder, the first coil and the second coil are wound around the first magnetic cylinder and the second magnetic cylinder respectively, a first wiring terminal and a second wiring terminal are led out of the first coil wound around the first magnetic cylinder, a third wiring terminal and a fourth wiring terminal are led out of the second coil wound around the second magnetic cylinder, a distance between the second wiring terminal and the balanced winding is less than a distance between the first wiring terminal and the balanced winding, and a distance between the fourth wiring terminal and the balanced winding is less than a distance between the third wiring terminal and the balanced winding; the balanced winding coil, being wound, in an 8-shaped manner, on the first magnetic cylinder and the second magnetic cylinder of the E-E magnetic core without passing through the central cylinder of the E-E magnetic core, wherein one end of the balanced winding coil is connected to a slidable pin of the variable resistor, and the other end of the balanced winding coil is connected to either pin of two non-slidable pins of the variable resistor; and the electromagnetic interference filter, being connected to the common mode impedance regulator by using the second wiring terminal and the fourth wiring terminal, wherein the noise source is connected to the common mode impedance regulator by means of the first wiring terminal and the third wiring terminal. a noise source; a common mode impedance regulator and an electromagnetic interference filter, wherein the common mode impedance regulator comprises an E-E magnetic core, a first coil, a second coil, a balanced winding coil, and a variable resistor, wherein the E-E magnetic core comprises a first magnetic cylinder, a second magnetic cylinder, and a central cylinder, the first coil and the second coil are wound around the first magnetic cylinder and the second magnetic cylinder respectively, a first wiring terminal and a second wiring terminal are led out of the first coil wound around the first magnetic cylinder, a third wiring terminal and a fourth wiring terminal are led out of the second coil wound around the second magnetic cylinder, a distance between the second wiring terminal and the balanced winding is less than a distance between the first wiring terminal and the balanced winding, and a distance between the fourth wiring terminal and the balanced winding is less than a distance between the third wiring terminal and the balanced winding; the balanced winding coil, being wound, in an 8-shaped manner, on the first magnetic cylinder and the second magnetic cylinder of the E-E magnetic core without passing through the central cylinder of the E-E magnetic core, wherein one end of the balanced winding coil is connected to a slidable pin of the variable resistor, and the other end of the balanced winding coil is connected to either pin of two non-slidable pins of the variable resistor; and the electromagnetic interference filter, being connected to the common mode impedance regulator by using the second wiring terminal and the fourth wiring terminal, wherein the noise source is connected to the common mode impedance regulator by means of the first wiring terminal and the third wiring terminal.