A universal alternating current, AC, to direct current, DC, converter comprising: a rectifier ; a three-phase AC input coupled to the rectifier , wherein the rectifier is configured to convert an AC input voltage at the three-phase input into a DC current that is output to a high rail, a low rail and a neutral rail, and to accommodate varying three phase AC input voltages; a first DC to DC converter and a second DC to DC converter, wherein a first input of the first DC to DC converter is connected to the high rail and a second input of the second DC to DC converter is connected to the low rail; characterized in that the universal AC to DC converter further comprising: a switching system including: a first reverse oriented diode (D3) coupled between the neutral rail and a second input of the first DC to DC converter, a first forward oriented diode (D1) and a first switch (Q1) connected in parallel between the low rail and the second input of the first DC to DC converter, a second forward oriented diode (D4) coupled between the neutral rail and a first input of the second DC to DC converter, and a second reverse oriented diode (D2) and a second switch (Q2) connected in parallel between the high rail and the first input of the second DC to DC converter; wherein the input sides of the first DC to DC converter and the second DC to DC converter are connected in series, through the first reverse oriented diode (D3) and the second forward oriented diode (D4), in response to the first switch and the second switch being in an off configuration and the input sides of the first DC to DC converter and the second DC to DC converter are connected in parallel in response to the first switch and the second switch being in an on configuration; and wherein the input sides of the first and second DC to DC converters are controlled to be connected in parallel or series depending on the AC input voltage. a rectifier ; a three-phase AC input coupled to the rectifier , wherein the rectifier is configured to convert an AC input voltage at the three-phase input into a DC current that is output to a high rail, a low rail and a neutral rail, and to accommodate varying three phase AC input voltages; a first DC to DC converter and a second DC to DC converter, wherein a first input of the first DC to DC converter is connected to the high rail and a second input of the second DC to DC converter is connected to the low rail; a first reverse oriented diode (D3) coupled between the neutral rail and a second input of the first DC to DC converter, a first forward oriented diode (D1) and a first switch (Q1) connected in parallel between the low rail and the second input of the first DC to DC converter, a second forward oriented diode (D4) coupled between the neutral rail and a first input of the second DC to DC converter, and a second reverse oriented diode (D2) and a second switch (Q2) connected in parallel between the high rail and the first input of the second DC to DC converter; wherein the input sides of the first DC to DC converter and the second DC to DC converter are connected in series, through the first reverse oriented diode (D3) and the second forward oriented diode (D4), in response to the first switch and the second switch being in an off configuration and the input sides of the first DC to DC converter and the second DC to DC converter are connected in parallel in response to the first switch and the second switch being in an on configuration; and wherein the input sides of the first and second DC to DC converters are controlled to be connected in parallel or series depending on the AC input voltage. <EOS>