Turnout switch machine expression rod notch signal processing circuit

Abstract

The invention discloses a turnout switch machine expression rod notch signal processing circuit. An input buffering circuit receives a turnout switch machine expression rod notch signal detected by anelectric eddy current sensor. The signal is transmitted to a peak holding and conditioning circuit after being subjected to clamping and impedance matching. An amplifying circuit is adopted for amplifying frequency component of an alternating voltage signal output by an electric eddy probe under oscillation frequency of an oscillator module, wherein the amplifying circuit is formed by connectinga variable LC parallel network and an operational amplifier AR2 in series through double T networks. Later, the peak holding circuit obtains an expression rod notch peak signal and outputs the signalafter keeping the signal for a certain period of time, one way is fed back to the variable LC parallel network, resonance with the frequency component of the alternating voltage signal is achieved, the frequency stability of amplifying of the amplifying circuit is improved, the other way is compensated after being compared with the amplified signal, the amplitude stability of amplifying of the amplifying circuit is improved, after a source electrode following output circuit receives a peak holding signal, the signal is further subjected to impedance conversion through pi-type filtering and source electrode follower and then output to the controller.

Description

technical field [0001] The invention relates to the technical field of switch machines, in particular to a signal processing circuit for indicating rod gaps of a switch machine. Background technique [0002] The authorized announcement number is CN104197821B, the monitoring system for the notch width of the turnout switch machine and its eddy current sensor. The eddy current sensor uses high-frequency oscillating current to generate an alternating magnetic field through the eddy current probe, and uses the metal conductor to move to make the eddy current probe generate The magnetic field changes and is converted into current or voltage, which is rectified and filtered by the detection module, temperature compensated by the temperature compensation module, and amplified by the output buffer module to output, and an eddy current sensor that meets the actual needs (accuracy, sensitivity) is designed; The information of the notch width of the rod detected by the sensor is transm...

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a signal processing circuit for the gap signal of the switch point machine, which has the characteristics of ingenious conception and humanized design, and effectively solves the problem of transmission to the AD acquisition module. signal distortion problem

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