Control device for feed-forward control of a DC / DC converter

The invention relates to a control device (10, 11, 12) for a DC / DC converter (5), with an AD converter (20) for converting a rectified voltage The essence of the invention is that the control device (10, 11, 12) having a first means (30) which is connected to the AD converter (20) and adapted to a variable feedforward coefficient (K) as a function the digital voltage (U The invention also relates to a method of operating a DC / DC converter (5) and a DC / DC converter (5) with an inventive control device (10, 11, 12).