发明公开
- 专利标题： GROUND FAULT DETECTING CIRCUIT FOR SUBSCRIBER LINES
- 专利标题（中）： NACHWEISSCHALTUNGFÜRDIE ERDE。
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申请号： EP90901688.3申请日： 1990-01-12
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公开(公告)号： EP0425675A1公开(公告)日： 1991-05-08
- 发明人: KINOSHITA, Kazumi 1587-101, Suenaga , TAKATO, Kenji 4-17-1-106, Takaishi , TOJO, Toshiro 345-1-105, Okuracho
- 申请人： FUJITSU LIMITED
- 申请人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 当前专利权人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 代理机构： Lehn, Werner, Dipl.-Ing.
- 优先权： JP112612/89 19890119
- 国际公布： WO9008441 19900726
- 主分类号： H04M19/00
- IPC分类号： H04M19/00 ; H04M3/30 ; H04M3/18 ; H02M3/155
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.
公开/授权文献
- EP0425675B1 GROUND FAULT DETECTING CIRCUIT FOR SUBSCRIBER LINES 公开/授权日：1996-07-10
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