发明名称 |
Vehicle detector with series resonant oscillator drive. |
摘要 |
<p>An inductive sensor (12) is driven by a series resonant oscillator circuit (16) to produce an oscillator signal having a frequency which is a function of inductance of the inductive sensor. An inductive load, which includes the sensor, is connected in series with a capacitive impedance (112, 114, 210). Power to the series resonant circuit formed by the inductive load and the capacitive impedance is controlled as a function of current in the series circuit as sensed by a current sensor. A detection system provides a detector output based upon the frequency of the oscillator signal. <IMAGE></p> |
申请公布号 |
EP0520661(A1) |
申请公布日期 |
1992.12.30 |
申请号 |
EP19920305451 |
申请日期 |
1992.06.15 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
HOEKMAN, EARL B.;HAMER, STEVEN M. |
分类号 |
G01R27/26;G01V3/10;G08G1/042 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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