A dc/dc converter and a method for operating a dc/dc converter

The present invention relates to a DC/DC converter (1) for transferring an active power between two DC subsystems (5, 6) comprising: - a first converter stage (3) and a second converter stage (4) both configured to be selectively operated as an active inverter or as a passive rectifier; - an AC coupling circuit (2) for coupling the first and the second converter stage (3, 4 ) by means of an AC power transfer; and - a control unit (10) configured to switch the operation mode of the first and second converter stages (3, 4 ) depending on a measurement of an amount of power transfer through the AC coupling circuit (2).