公开(公告)号：EP0587966B1

公开(公告)日：1999-02-10

申请号：EP92830498.9

申请日：1992-09-16

Applicant: STMicroelectronics S.r.l.

Inventor： Tomasini, Luciano ,  Castello, Rinaldo

IPC: H04M19/08

CPC classification number: H04M19/08

Abstract: A certain amount of DC supply current derivable from a subscriber's line (VL, GROUND) is used for powering at respective regulated voltages a plurality of functional circuits (A,B...) of an equipment connectable to the line. A sensible energy saving can be achieved by splitting the valuable current among the functional circuits, on account of their priority rank, by using at least a differential pair of current delivering transistors (P2,P3). A special circuit monitors the actual current of absorption of the functional circuit of highest rank (A) and produces a control signal that is used for modifying the drive conditions of the current delivering transistors. The current waste caused by sinking a design maximum current through a dissipative shunt voltage regulator of each functional circuit as done in the prior art circuits, is prevented and all the current exceeding the actual absorption needs of the highest rank functional circuit may be distributed to the other functional circuits without waste. This same principle may be advantageously applied also to functional circuits of lesser and lesser rank of priority for maximizing the saving.

Abstract translation: 可以从用户线路（VL，GROUND）导出的一定量的直流电源电流用于向各个调节电压供电可连接到线路的设备的多个功能电路（A，B ...）。 通过使用至少一个差分对的电流输送晶体管（P2，P3），通过分配功能电路中的有价值的电流，由于它们的优先等级可以实现明智的节能。 专用电路监控最高等级（A）的功能电路的实际吸收电流，并产生用于修改电流输送晶体管的驱动条件的控制信号。 通过在现有技术电路中通过每个功能电路的耗散分流电压调节器设计最大电流引起的当前浪费被防止，并且超过最高功能电路的实际吸收需要的所有电流可以分配到 其他功能电路无浪费。 这个相同的原理也可以有利地应用于功能电路的优先级越来越少，从而最大化节省。