Electrical converter (100, 200, 300, 400, 500) for converting an AC signal having three phase voltages to a DC signal with power factor correction, the electrical converter comprising: three phase terminals (A, B, C), a first DC terminal and a second DC terminal, a first converter stage operably coupled to the three phase terminals and comprising a first intermediate node (x) and a second intermediate node (y), wherein the first converter stage is configured for converting between the AC signal at the at least three phase terminals and a first signal at the first intermediate node (x) and the second intermediate node (y), a second converter stage operably coupled to the first and second DC terminals (P, N) and comprising a third intermediate node (r) and a fourth intermediate node (s), wherein the second converter stage comprises a boost circuit (19, 20) operable to convert between a second signal at the third and fourth intermediate nodes (r, s) and the DC signal at the first and second DC terminals (P, N), wherein the boost circuit comprises at least one first active switch ( S xm, S my), a link connecting the first intermediate node (x) to the third intermediate node (r) and the second intermediate node (y) to the fourth intermediate node (s), a current injection circuit (14; 16, 17, 18) operable to connect, through second active switches, between the phase terminal having a smallest absolute instantaneous voltage value of the at least three phase terminals and the first and second DC terminals (P, N), or between the phase terminal having a smallest absolute instantaneous voltage value and the first and second intermediate nodes, a controller implemented with a first mode of operation, which is a normal mode of operation, in which the at least one first active switch ( S xm, S my) and the second active switches are operated through pulse width modulation, characterised in that the electrical converter further comprises a third converter stage (26, 701) operably coupled to the first and second DC terminals (P, N) and operable to convert the DC signal at the first and second DC terminals to a fourth signal at at least two third terminals (P', N'), and in that the controller is implemented with a second mode of operation wherein the second converter stage is controlled to be inoperative and wherein the third and fourth intermediate nodes (r, s) are continuously connected to the first and second DC terminals (P, N) respectively, the second active switches are operated through pulse width modulation to obtain unity power factor and the third converter stage (26, 701) is configured to be operated in a constant power mode. three phase terminals (A, B, C), a first DC terminal and a second DC terminal, a first converter stage operably coupled to the three phase terminals and comprising a first intermediate node (x) and a second intermediate node (y), wherein the first converter stage is configured for converting between the AC signal at the at least three phase terminals and a first signal at the first intermediate node (x) and the second intermediate node (y), a second converter stage operably coupled to the first and second DC terminals (P, N) and comprising a third intermediate node (r) and a fourth intermediate node (s), wherein the second converter stage comprises a boost circuit (19, 20) operable to convert between a second signal at the third and fourth intermediate nodes (r, s) and the DC signal at the first and second DC terminals (P, N), wherein the boost circuit comprises at least one first active switch ( S xm, S my), a link connecting the first intermediate node (x) to the third intermediate node (r) and the second intermediate node (y) to the fourth intermediate node (s), a current injection circuit (14; 16, 17, 18) operable to connect, through second active switches, between the phase terminal having a smallest absolute instantaneous voltage value of the at least three phase terminals and the first and second DC terminals (P, N), or between the phase terminal having a smallest absolute instantaneous voltage value and the first and second intermediate nodes, a controller implemented with a first mode of operation, which is a normal mode of operation, in which the at least one first active switch ( S xm, S my) and the second active switches are operated through pulse width modulation, characterised in that the electrical converter further comprises a third converter stage (26, 701) operably coupled to the first and second DC terminals (P, N) and operable to convert the DC signal at the first and second DC terminals to a fourth signal at at least two third terminals (P', N'), and in that the controller is implemented with a second mode of operation wherein the second converter stage is controlled to be inoperative and wherein the third and fourth intermediate nodes (r, s) are continuously connected to the first and second DC terminals (P, N) respectively, the second active switches are operated through pulse width modulation to obtain unity power factor and the third converter stage (26, 701) is configured to be operated in a constant power mode.