DC/DC converter efficiency improvement for low current levels

The present document relates to DC (Direct Current)/ DC converters. In particular, the present document relates to efficient DC/DC converters with a modular structure for providing different levels of output currents. A controller (250) for controlling a power converter (200) which is configured to convert electrical power at an input voltage (111) into electrical power at an output voltage (112) is described. The power converter (200) comprises a first inverter stage (210) comprising a first high side switch (101) and a first low side switch (102) which are arranged in series between the input voltage (111) and a reference voltage. The power converter (200) further comprises a second inverter stage (220) comprising a second high side switch (101) and a second low side switch (102) which are arranged in series between the input voltage (111) and the reference voltage. A midpoint (123) between the first high side switch (101) and the first low side switch (102) is coupled with a midpoint (123) between the second high side switch (101) and the second low side switch (102). The electrical power at the output voltage (112) is drawn from the midpoint. The controller (250) is configured to determine an indication of a requested level of the electrical power at the output voltage (112), and to activate or deactivate the second inverter stage (220) based on the indication of the requested level of the electrical power at the output voltage (112).