A step-up converter, comprising: a first voltage supply source; a transformer (L1, L2); a plurality of MOSFETs (M1, M2, M3, M4) connected to a low voltage side of the transformer (L1, L2); a rectifier circuit connected to a high voltage side of the transformer (L1, L2); and an outlet; characterized by comprising: a first capacitor connected at one end between the first voltage supply source and one of the plurality of MOSFETs (M1, M2, M3, M4); an input filter connected with the first voltage supply source; wherein the input filter comprises a first inductor, and a second capacitor; wherein the first inductor is coupled in series with the first voltage supply source; wherein a first end of the second capacitor is interposed in parallel between the first inductor and the first voltage supply source; wherein the inductance value of the first inductor is in the range of 1 to 20 μH; wherein the first end of the first capacitor is interposed in parallel between one of the plurality of MOSFETs (M1, M2, M3, M4) and the first inductor; and wherein the capacitance value of the first capacitor is in the range of 3 to 10 μF such that a voltage at the first capacitor is oscillated to obtain a higher effective voltage such that the output voltage at the outlet is increased and the current to be switched is reduced. a first voltage supply source; a transformer (L1, L2); a plurality of MOSFETs (M1, M2, M3, M4) connected to a low voltage side of the transformer (L1, L2); a rectifier circuit connected to a high voltage side of the transformer (L1, L2); and an outlet; characterized by comprising: a first capacitor connected at one end between the first voltage supply source and one of the plurality of MOSFETs (M1, M2, M3, M4); an input filter connected with the first voltage supply source; wherein the input filter comprises a first inductor, and a second capacitor; wherein the first inductor is coupled in series with the first voltage supply source; wherein a first end of the second capacitor is interposed in parallel between the first inductor and the first voltage supply source; wherein the inductance value of the first inductor is in the range of 1 to 20 μH; wherein the first end of the first capacitor is interposed in parallel between one of the plurality of MOSFETs (M1, M2, M3, M4) and the first inductor; and wherein the capacitance value of the first capacitor is in the range of 3 to 10 μF such that a voltage at the first capacitor is oscillated to obtain a higher effective voltage such that the output voltage at the outlet is increased and the current to be switched is reduced. a first capacitor connected at one end between the first voltage supply source and one of the plurality of MOSFETs (M1, M2, M3, M4); an input filter connected with the first voltage supply source; wherein the input filter comprises a first inductor, and a second capacitor; wherein the first inductor is coupled in series with the first voltage supply source; wherein a first end of the second capacitor is interposed in parallel between the first inductor and the first voltage supply source; wherein the inductance value of the first inductor is in the range of 1 to 20 μH; wherein the first end of the first capacitor is interposed in parallel between one of the plurality of MOSFETs (M1, M2, M3, M4) and the first inductor; and wherein the capacitance value of the first capacitor is in the range of 3 to 10 μF such that a voltage at the first capacitor is oscillated to obtain a higher effective voltage such that the output voltage at the outlet is increased and the current to be switched is reduced.