公开(公告)号：EP0425675B1

公开(公告)日：1996-07-10

申请号：EP90901688.3

申请日：1990-01-12

申请人： FUJITSU LIMITED

发明人： KINOSHITA, Kazumi 1587-101, Suenaga ,  TAKATO, Kenji 4-17-1-106, Takaishi ,  TOJO, Toshiro 345-1-105, Okuracho

IPC分类号： H04M19/00 ,  H04M3/30 ,  H04M3/18 ,  H02M3/155

CPC分类号： H04M19/008 ,  H04M3/30 ,  H04M19/006

摘要： This invention relates to an earth detecting circuit for a long-distance subscriber's circuit in a small-capacity digital electronic switch-board. A DC/DC converter of a power source for supplying electric power is stopped when an earth is detected. Upon receiving a stop signal, the DC/DC converter converts the source voltage for the subscriber's circuit into the voltage of the system power source for the switch-board, i.e., the voltage before the conversion by the DC/DC converter. The supply resistors in the power supplying circuit are not broken even when the current continues to flow through the supply resistors because of the earth, and the alarm state is kept until the operation for resume is performed.

公开(公告)号：EP0425675A1

公开(公告)日：1991-05-08

申请号：EP90901688.3

申请日：1990-01-12

申请人： FUJITSU LIMITED

发明人： KINOSHITA, Kazumi 1587-101, Suenaga ,  TAKATO, Kenji 4-17-1-106, Takaishi ,  TOJO, Toshiro 345-1-105, Okuracho

IPC分类号： H04M19/00 ,  H04M3/30 ,  H04M3/18 ,  H02M3/155

CPC分类号： H04M19/008 ,  H04M3/30 ,  H04M19/006

摘要： This invention relates to an earth detecting circuit for a long-distance subscriber's circuit in a small-capacity digital electronic switch-board. A Dc/Dc converter of a power source for supplying electric power is stopped when an earth is detected. Upon receiving a stop signal, the DC/DC converter converts the source voltage for the subscriber's circuit into the voltage of the of the system power source for the switch-board, i.e., the voltage before the conversion by the DC/DC converter. The supply resistors in in the power supplying circuit are not broken even when the current continues to flow through the supply resistors because of the earth, and the alarm state is kept until the operation for resume is performed.

摘要翻译： 本发明涉及一种用于小容量数字电子开关板中的长距离用户电路的接地检测电路。 当检测到地球时，停止用于供电的电源的DC / DC转换器。 在接收到停止信号时，DC / DC转换器将用户电路的源电压转换成用于开关板的系统电源的电压，即由DC / DC转换器转换之前的电压。 供电电路中的电源电阻即使当地电流继续流过电源电阻时也不会断开，并且保持报警状态，直到执行恢复操作。