发明授权
- 专利标题： Circuit for detecting current variations
- 专利标题（中）： 用于检测电流变化的电路
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申请号： US30263申请日： 1987-03-24
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公开(公告)号： US4731829A公开(公告)日： 1988-03-15
- 发明人: Yves A. Bonnet , Christian Jacquart
- 申请人： Yves A. Bonnet , Christian Jacquart
- 申请人地址： NY Armonk
- 专利权人： International Business Machines Corp.
- 当前专利权人： International Business Machines Corp.
- 当前专利权人地址： NY Armonk
- 优先权： EPX84430019.4 19840620
- 主分类号： H04Q3/72
- IPC分类号： H04Q3/72 ; H04M3/22
摘要：
The circuit of the present invention detects variations of a current I.sub.L flowing in a telephone line LL. A low-value resistor r is connected in series with line LL. A constant voltage generator is connected across this resistor. The current Is applied to resistor r by the contant voltage generator varies as a function of I.sub.L. This being so, a measurement of the variations of Is will reflect variations of I.sub.L and, therefore, can be used to detect both amplitude and directional variations of I.sub.L.
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