Dc-power supply device

A DC-power supply device for supplying operational DC power to an external DC-powered device via a wired connection, the DC-power supply device comprising:

• a DC-power output interface for providing the operational DC power to the DC-powered device via the wired connection, the DC-power output interface being operable in a power-provision-enabled mode in which operational DC power is deliverable to the DC-powered device upon request, and in a power-provision-disabled mode in which operational DC power is not deliverable to the DC-powered device;
• a communication unit configured to receive a shutdown-request signal indicative of a shutdown time-span (ts) during which no operational DC power is required by the DC-powered device via the DC-power output interface, and to provide a shutdown-trigger signal indicative thereof;
• wherein the shutdown-request signal is provided via the wired connection by the DC-powered device;
• a DC-powered device detection unit configured to detect a connected state, in which a DC-powered device is connected to the DC-power output interface via the wired connection, and to detect a disconnected state, in which the wired connection is disconnected, and to provide a connection status signal (S3) indicative thereof;
• wherein the connected state is an indication of whether there is a wired connection connecting the DC-power supply device and the DC-powered device;
• and
• a power control unit connected to the DC-power output interface, to the communication unit and to the DC-powered device detection unit and configured:
• to receive the shutdown-trigger signal and the connection status signal;
• upon reception of the shutdown-trigger signal, to drive operation of
• the DC-power output interface in the power-provision-disabled mode during the shutdown time-span;
• and
• upon reception of the connection status signal indicative of the disconnected state, to drive operation of the DC-power output interface in the power-provision-enabled mode.