A power converter comprising: a primary stage comprising at least one first cut-off switch (S 11, S 12, S 13, S 14); a control circuit capable of applying a first control signal to said at least one first switch; a secondary stage comprising at least one second cut-off switch (S 21, S 22, S 23, S 24); a control circuit capable of applying a second control signal to said at least one second switch and of measuring an output current (I) of the secondary stage; a power transmission stage coupling the primary stage to the secondary stage, wherein the control circuit of the secondary stage is electrically isolated from the control circuit of the primary stage, and wherein the control circuit of the secondary stage is configured to, during an operating range selection phase when the converter is started, determine, based on a measurement of the output current (I) of the secondary stage, in which operating range among ranges [-π; -π/2], [-π/2; 0], [0; π/2], and [π/2; π] a phase shift φ between the first signal for controlling said at least one first switch and a signal for controlling said at least one second switch is located, wherein the control circuit of the secondary stage is capable, during the operating range selection phase, of: a) determining a direction of transfer of an electric power between the primary stage and the secondary stage; b) determining the sign of a ratio ΔX/Δφ between a variation ΔX of the electric power transferred between the primary stage and the secondary stage or of an output current (I s) of the secondary stage and a corresponding variation Δφ of the phase of the second signal for controlling the second switch; and c) modifying the phase of the second signal for controlling said at least one second switch according to the transfer direction determined at step a) and to the sign of the ratio ΔX/Δφ determined at step b), to place phase shift φ within range [-π/2; 0], or [0; π/2]. a primary stage comprising at least one first cut-off switch (S 11, S 12, S 13, S 14); a control circuit capable of applying a first control signal to said at least one first switch; a secondary stage comprising at least one second cut-off switch (S 21, S 22, S 23, S 24); a control circuit capable of applying a second control signal to said at least one second switch and of measuring an output current (I) of the secondary stage; a power transmission stage coupling the primary stage to the secondary stage, wherein the control circuit of the secondary stage is electrically isolated from the control circuit of the primary stage, and wherein the control circuit of the secondary stage is configured to, during an operating range selection phase when the converter is started, determine, based on a measurement of the output current (I) of the secondary stage, in which operating range among ranges [-π; -π/2], [-π/2; 0], [0; π/2], and [π/2; π] a phase shift φ between the first signal for controlling said at least one first switch and a signal for controlling said at least one second switch is located, wherein the control circuit of the secondary stage is capable, during the operating range selection phase, of: a) determining a direction of transfer of an electric power between the primary stage and the secondary stage; b) determining the sign of a ratio ΔX/Δφ between a variation ΔX of the electric power transferred between the primary stage and the secondary stage or of an output current (I s) of the secondary stage and a corresponding variation Δφ of the phase of the second signal for controlling the second switch; and c) modifying the phase of the second signal for controlling said at least one second switch according to the transfer direction determined at step a) and to the sign of the ratio ΔX/Δφ determined at step b), to place phase shift φ within range [-π/2; 0], or [0; π/2]. a) determining a direction of transfer of an electric power between the primary stage and the secondary stage; b) determining the sign of a ratio ΔX/Δφ between a variation ΔX of the electric power transferred between the primary stage and the secondary stage or of an output current (I s) of the secondary stage and a corresponding variation Δφ of the phase of the second signal for controlling the second switch; and c) modifying the phase of the second signal for controlling said at least one second switch according to the transfer direction determined at step a) and to the sign of the ratio ΔX/Δφ determined at step b), to place phase shift φ within range [-π/2; 0], or [0; π/2].