Patent ID: 8098242

Claim:
An arrangement comprising: a power supply unit comprising a switching power converter, the switching power converter comprising at least one semiconductor switch for controlling a duty cycle of the switching power converter using a pulse width modulated control signal; and a first electronic device coupled to the power supply unit such that the power supply unit provides the first electronic device with electric operating energy from a mains voltage, wherein the first electronic device comprises: an evaluation unit coupled to the power supply unit and adapted to switch the first electronic device from an operating state into at least one energy saving state and vice-versa, to turn off the power supply if the first electronic device is switched into the energy saving state, and to turn on the power supply if the first electronic device is switched into the operating state, wherein the evaluation unit comprises a microcontroller having a general purpose I/O pin providing the pulse width modulated control signal via the general purpose I/O pin to the at least one semiconductor switch to regulate the switching power converter of the power supply unit and, in the energy saving state, the microcontroller turns off the power supply unit by deactivating the pulse width modulated control signal; and a standard interface for connecting the first electronic device to a second electronic device, the standard interface being adapted to supply the evaluation unit with an electric auxiliary energy received from the second electronic device, wherein the standard interface comprises a graphics interface adapted to connect the first electronic device with the second electronic device; wherein the first electronic device comprises a display device, comprising a display screen and a scaling unit, wherein the scaling unit is coupled to the graphics interface and the display screen, the scaling unit being adapted to generate an output signal for the display screen based on a graphics signal received from the graphics interface; wherein the evaluation unit is integrated into the scaling unit; wherein the scaling unit comprises the microcontroller of the evaluation unit, the microcontroller being connected to the graphics interface for supplying the microcontroller with an operating energy in the energy saving state; and wherein, in the energy saving state, the scaling unit is completely deactivated while the microcontroller is supplied with auxiliary energy received from the second electronic device.