Resonant circuit for a measuring device and measuring device

Resonant circuit for a measuring device and measuring device

  • CN 105,865,554 B
  • Filed: 02/04/2016
  • Issued: 08/10/2021
  • Est. Priority Date: 02/05/2015
  • Status: Active Grant
First Claim
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1. A resonant circuit for a measurement device configured to:

  • receiving a pulse density signal obtained by delta-sigma modulating an analog displacement signal with a delta-sigma modulator and a multi-bit signal obtained from the pulse density signal; and

    generating an excitation signal from the pulse density signal and the multi-bit signal, the resonant circuit comprising;

    an amplification factor controller configured to set an amplification factor in accordance with a vibration signal obtained from the multi-bit signal;

    a multiplier configured to amplify a level of the pulse density signal by the amplification factor; and

    a circuit group configured to generate the excitation signal from a pulse density signal obtained by further delta-sigma modulating an output of the multiplier;

    wherein the amplification factor controller is configured to;

    setting the amplification factor using proportional control and integral control in accordance with a difference between an amplitude signal obtained from the vibration signal and a target amplitude value, the amplification factor controller including an amplifier and an integrator,and wherein, in relation to the integral control, the amplification factor controller is configured to;

    when the amplitude signal exceeds a reference value and is continuously close to the target amplitude value and the output of the integrator reaches a limit, the integral value is set to 0 to prevent excessive integration, and the reference value is different from the target amplitude value.

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