A resonant converter circuit comprising: a resonant tank circuit; and a transformer circuit, wherein the resonant tank circuit is connected to a primary side of three connection points of the transformer circuit configured to receive a three-phase power input from the resonant tank circuit, the transformer circuit comprising: a first transformer and a second transformer, a first terminal (T1-1) of the first transformer connected to a first terminal (T2-1) of the second transformer; and an inductor connected between a second terminal (T1-2) of the first transformer and a second terminal (T2-2) of the second transformer, wherein the transformer circuit is a two-winding high frequency transformer circuit; the primary side of the transformer circuit comprising a first input node formed by a connection of the second terminal (T1-2) of the first transformer and a first terminal (L1-1) of the inductor, a second input node formed by the connection of the first terminal (Tl-1) of the first transformer and the first terminal (T2-1) of the second transformer and a third input node formed by a connection of the second terminal (T2-2) of the second transformer and a second terminal (LI-2) of the inductor; the resonant tank circuit comprising a first branch (RT 1) comprising an inductor (L ra) in series with a capacitor (C ra), a second branch (RT 2) comprising an inductor (L rb) in series with a capacitor (C rb), and a third branch (RT 3) comprising an inductor (L rc) in series with a capacitor (C rc), wherein the first branch (RT 1) is connected to the first input node of the transformer circuit, the second branch (RT 2) is connected to the second input node of the transformer circuit, and the third branch (RT 3) is connected to the third input node of the transformer circuit; wherein the first input node is configured to receive a first phase of the three-phase power input, the second node is configured to receive a second phase of the three-phase power input and the third node is configured to receive a third phase of the three-phase power input; and the transformer circuit comprising a secondary side configured to deliver a three-phase power output, the secondary side comprising a first output node formed by a third terminal (T1-3) of the first transformer, a second output node formed by a connection of a fourth terminal (T1-4) of the first transformer and a fourth terminal (T2-4) of the second transformer, and a third output node formed by a third terminal (T2-3) of the second transformer. a resonant tank circuit; and a transformer circuit, wherein the resonant tank circuit is connected to a primary side of three connection points of the transformer circuit configured to receive a three-phase power input from the resonant tank circuit, a first transformer and a second transformer, a first terminal (T1-1) of the first transformer connected to a first terminal (T2-1) of the second transformer; and an inductor connected between a second terminal (T1-2) of the first transformer and a second terminal (T2-2) of the second transformer, wherein the transformer circuit is a two-winding high frequency transformer circuit; the primary side of the transformer circuit comprising a first input node formed by a connection of the second terminal (T1-2) of the first transformer and a first terminal (L1-1) of the inductor, a second input node formed by the connection of the first terminal (Tl-1) of the first transformer and the first terminal (T2-1) of the second transformer and a third input node formed by a connection of the second terminal (T2-2) of the second transformer and a second terminal (LI-2) of the inductor; the resonant tank circuit comprising a first branch (RT 1) comprising an inductor (L ra) in series with a capacitor (C ra), a second branch (RT 2) comprising an inductor (L rb) in series with a capacitor (C rb), and a third branch (RT 3) comprising an inductor (L rc) in series with a capacitor (C rc), wherein the first branch (RT 1) is connected to the first input node of the transformer circuit, the second branch (RT 2) is connected to the second input node of the transformer circuit, and the third branch (RT 3) is connected to the third input node of the transformer circuit; wherein the first input node is configured to receive a first phase of the three-phase power input, the second node is configured to receive a second phase of the three-phase power input and the third node is configured to receive a third phase of the three-phase power input; and the transformer circuit comprising a secondary side configured to deliver a three-phase power output, the secondary side comprising a first output node formed by a third terminal (T1-3) of the first transformer, a second output node formed by a connection of a fourth terminal (T1-4) of the first transformer and a fourth terminal (T2-4) of the second transformer, and a third output node formed by a third terminal (T2-3) of the second transformer.