Importance

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Abstract

An exciter and detector circuit (A1, A2) is inductively coupled (18, 20) with a current conductor (B). The current conductor extends to a remote location at which it is inductively coupled (26, 30) with a remote transducer and encoder circuit (C1, C2). The exciter and decoder circuit supplies a square wave signal of a fixed frequency and amplitude across a primary winding (18) of the inductive coupler. After each half cycle of the square wave as the magnetic field in the inductive coupler is collapsing, a flyback voltage peak is generated which varies with the load applied to the current conductor. At the remote location, a voltage to frequency converter (40) converts variations in the output of the transducer into corresponding variations in a frequency signal. A load modulator (42) is connected with the voltage to frequency converter to apply a load to the rectifier at the frequency of the voltage to frequency converter. This causes the amplitude of the flyback voltage peaks to vary with an envelope frequency which is the same as the frequency of the voltage to frequency converter. A detector frequency to voltage converter (70) converts the envelope frequency into a voltage which varies in proportion to the envelope frequency, hence, to variations in the condition sensed by the transducer.

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