Vehicle detector with series resonant oscillator drive

Details Vehicle detector with series resonant oscillator drive Vehicle detector with series resonant oscillator drive

G - Physics

08

G

G08G 1/042 (2006.01) H03B 5/00 (2006.01) G06F 15/48 (1990.01)

Patent

CA 2068896

VEHICLE DETECTOR WITH SERIES RESONANT OSCILLATOR DRIVE ABSTRACT OF THE DISCLOSURE An inductive sensor is driven by a series resonant oscillator circuit 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. 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.

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