A power converter, comprising: an input power source; a transformer isolated open loop converter comprising at least one primary winding and a plurality of secondary windings (108a-n), wherein the plurality of secondary windings comprises at least a first secondary winding and a second secondary winding, wherein the first and the second secondary windings have a different output voltage; a plurality of DC/DC closed loop converters (114a-n), wherein an input of each of the DC/DC closed loop converters (114a-n) is connected to an output of a respective secondary winding (108a-n), wherein the number of secondary windings (108a-n) is the same as the number of DC/DC closed loop converters (114a-n), and wherein the first secondary winding is connected to a first DC/DC closed loop converter and the second secondary winding is connected to a second DC/DC closed loop converter; wherein each of the plurality of DC/DC closed loop converters (114a-n) is switchable between a straight-through operating state and a closed-loop operating state, wherein in the straight-through operating state, power passes directly through a closed-loop converter (114a-n) without being modified; wherein an output voltage of the plurality of DC/DC closed loop converters (114a-n) is connected in series to determine an output voltage of the power converter; wherein: in a first voltage range, at least the first DC/DC closed loop converter is configured to be operated in a straight-through operating state and at least the second DC/DC closed loop converter is configured to be operated in a closed-loop operating state, and in a second voltage range, at least the first DC/DC closed loop converter is configured to be operated in a closed-loop operating state and at least the second DC/DC closed loop converter is configured to be operated in a straight-through operating state, such that most of the power is converted by the transformer isolated open loop converter and the at least one DC/DC closed loop converter operating in the straight-through state. an input power source; a transformer isolated open loop converter comprising at least one primary winding and a plurality of secondary windings (108a-n), wherein the plurality of secondary windings comprises at least a first secondary winding and a second secondary winding, wherein the first and the second secondary windings have a different output voltage; a plurality of DC/DC closed loop converters (114a-n), wherein an input of each of the DC/DC closed loop converters (114a-n) is connected to an output of a respective secondary winding (108a-n), wherein the number of secondary windings (108a-n) is the same as the number of DC/DC closed loop converters (114a-n), and wherein the first secondary winding is connected to a first DC/DC closed loop converter and the second secondary winding is connected to a second DC/DC closed loop converter; wherein each of the plurality of DC/DC closed loop converters (114a-n) is switchable between a straight-through operating state and a closed-loop operating state, wherein in the straight-through operating state, power passes directly through a closed-loop converter (114a-n) without being modified; wherein an output voltage of the plurality of DC/DC closed loop converters (114a-n) is connected in series to determine an output voltage of the power converter; wherein: in a first voltage range, at least the first DC/DC closed loop converter is configured to be operated in a straight-through operating state and at least the second DC/DC closed loop converter is configured to be operated in a closed-loop operating state, and in a second voltage range, at least the first DC/DC closed loop converter is configured to be operated in a closed-loop operating state and at least the second DC/DC closed loop converter is configured to be operated in a straight-through operating state, such that most of the power is converted by the transformer isolated open loop converter and the at least one DC/DC closed loop converter operating in the straight-through state. in a first voltage range, at least the first DC/DC closed loop converter is configured to be operated in a straight-through operating state and at least the second DC/DC closed loop converter is configured to be operated in a closed-loop operating state, and in a second voltage range, at least the first DC/DC closed loop converter is configured to be operated in a closed-loop operating state and at least the second DC/DC closed loop converter is configured to be operated in a straight-through operating state, such that most of the power is converted by the transformer isolated open loop converter and the at least one DC/DC closed loop converter operating in the straight-through state.