Power supply circuit, telecommunication device and method for multiple DC slope power management

A power supply circuit comprising:

• a line voltage forming circuit for forming a first voltage that is proportional to a line voltage provided by a telecommunication line;
• a supply voltage forming circuit for forming a second voltage from said first voltage, said second voltage being proportional to said first voltage;
• and
• a sensing circuit for sensing said telecommunication line and for providing a sensor signal that is representative of power provided by said telecommunication line, said line voltage forming circuit being controlled by said sensor signal such that a slope of a load line characteristic of said line voltage forming circuit is modified when said sensor signal is above a predetermined threshold signal, said load line characteristic defining an increase of said line voltage with an increase of a line current provided by said telecommunication line;
• wherein said sensing circuit comprises a voltage comparator, said predetermined threshold signal being a voltage threshold signal that is provided to said voltage comparator, said voltage comparator providing said sensor signal.

A method for deriving a supply voltage from a line that provides a line voltage, said method comprising:

• forming a first voltage that is proportional to said line voltage;
• deriving said supply voltage from said voltage, said supply voltage being proportional to said first voltage;
• sensing said telecommunication line, thereby providing a sensor signal that is representative of power provided by said line;
• and using said sensor signal to control said forming of said first voltage such that a slope of a load line characteristic is modified when said sensor signal is above a predetermined threshold signal, said load line characteristic defining an increase of said line voltage with an increase of a line current provided by said line;
• and
• further modifying said slope when said sensor signal is above a further predetermined threshold signal, said further predetermined threshold signal being above said predetermined threshold signal.

A power supply circuit comprising:

• a line voltage forming circuit for forming a first voltage that is proportional to a line voltage provided by a telecommunication line;
• a supply voltage forming circuit for forming a second voltage from the first voltage, the second voltage being proportional to the first voltage;
• and
• a sensing circuit for sensing the line current provided by the telecommunication line,
• the line voltage forming circuit being controlled by a sensor signal provided by the sensing circuit such that a slope of a load line characteristic of the line voltage forming circuit is modifiable when the line current is above a first current threshold and wherein the slope of the load line characteristic of the line voltage forming circuit is further modifiable when the line current is above a second current threshold, wherein the second current threshold is above the first current threshold;
• wherein the load line characteristic defines an increase of the line voltage with an increase of the line current provided by the telecommunication line.