CN-122015623-A - Analog-digital integrated output circuit of magneto-displacement sensor and control method

CN122015623ACN 122015623 ACN122015623 ACN 122015623ACN-122015623-A

Abstract

The invention discloses an analog-digital integrated output circuit of a magneto-induced displacement sensor and a control method, wherein the circuit comprises a signal acquisition module, a signal processing module, an analog signal output module and a digital signal output module, wherein the signal acquisition module is connected with the signal excitation module and used for amplifying, filtering and analog-digital converting a magnetostrictive displacement response signal returned by the magneto-induced displacement sensor to obtain a digitized magnetostrictive displacement response signal, the signal processing module is connected with the signal acquisition module and used for carrying out displacement calculation, linearization compensation, temperature drift correction and hardware delay correction on the digitized magnetostrictive displacement response signal, the analog signal output module is connected with the signal processing module and used for generating a plurality of output types of analog signals according to the output result of the signal processing module, the digital signal output module is connected with the signal processing module and used for outputting the digitized magnetostrictive displacement response signal in a digital communication protocol, and the output mode selection unit is used for configuring the output types of the analog signal output module.

Inventors

WANG HANBING
WANG XINGJIE
ZHOU KENAN

Assignees

湖北米朗科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. An analog-digital integrated output circuit of a magneto-displacement sensor, comprising: The signal excitation module is used for providing excitation pulse or excitation current for the magneto-induced displacement sensor so as to enable the magneto-induced displacement sensor to generate a magnetostriction displacement response signal which can be acquired; The signal acquisition module is connected with the signal excitation module and is used for amplifying, filtering and analog-to-digital converting the magnetostriction displacement response signal returned by the magnetostriction displacement sensor to obtain a digitized magnetostriction displacement response signal; The signal processing module is connected with the signal acquisition module and is used for carrying out displacement calculation, linearization compensation, temperature drift correction and hardware delay correction on the digitized magnetostriction displacement response signal; The analog signal output module is connected with the signal processing module and is used for generating a plurality of analog signals of an output type according to the output result of the signal processing module and outputting at least one analog signal of the output type, wherein the analog signals of the output type comprise a plurality of current outputs or a plurality of voltage outputs; the digital signal output module is connected with the signal processing module and is used for outputting the digitized magnetostriction displacement response signal in a digital communication protocol; and the output system selection unit is used for configuring the output types of the analog signal output module and the digital signal output module, so that the same circuit board can select different output types according to application requirements.
2. An analog to digital integrated output circuit for a magneto-dependent displacement sensor as claimed in claim 1, in which the signal excitation module comprises a constant current source, an excitation controller and a time reference unit for providing a unified clock reference for the signal processing module required for displacement calculation.
3. An analog-to-digital integrated output circuit of a magneto-displacement sensor as claimed in claim 1, wherein the signal acquisition module comprises a preamplifier, a low noise filter and a high resolution ADC for noise suppression and high accuracy digitization of magnetostrictive echo signals.
4. The integrated analog-to-digital output circuit of a magneto-displacement sensor of claim 1, wherein the analog signal output module comprises a programmable current source circuit and a programmable voltage amplifying circuit, and the signal processing module controls the output type of the analog signal output module through a mode configuration register.
5. The integrated analog-to-digital output circuit of a magneto-displacement sensor of claim 1, wherein said digital signal output module employs an isolated transceiver structure to improve anti-interference performance and long-distance transmission stability.
6. The integrated analog-to-digital output circuit of a magneto-displacement sensor of claim 1, wherein the output system selection unit comprises a dial switch, a jumper, or a programmable electronic switch for selecting a corresponding output type according to production requirements.
7. A control method of an analog-digital integrated output circuit of a magneto-displacement sensor according to any one of claims 1 to 6, comprising: The signal processing module generates an excitation pulse instruction according to a preset time sequence, the excitation controller outputs excitation current according to the instruction, generates an excitation reference label, sends the excitation reference label to the signal acquisition module to be used as a reference for checking the subsequent echo time, and reads the noise level fed back by the signal acquisition module to adjust the excitation amplitude of the next round; The method comprises the steps of echo multidimensional acquisition and confidence level construction, wherein a signal acquisition module synchronously detects a magneto-echo signal to obtain an original waveform, three types of data including an amplitude track, an envelope track and an instantaneous gradient are simultaneously generated for the original waveform, the signal processing module constructs echo confidence level according to the three types of data, and excitation enhancement feedback of an excitation self-calibration triggering step is triggered when the echo confidence level is less than an echo confidence level threshold value; the signal processing module establishes a variable domain time difference through an excitation reference tag and echo characteristic point time, inputs the variable domain time difference into a dynamic drift model, and carries out temperature drift correction, excitation drift correction and hardware delay correction; and a displacement self-evolution calculation step, namely calculating the displacement by a signal processing module through a self-evolution function according to the variable domain time difference, triggering echo multidimensional acquisition and confidence level construction step to resample if the current displacement exceeds the last displacement, dynamically smoothing the current displacement with insufficient stability, and generating a new current displacement.
8. The method for controlling an analog-digital integrated output circuit of a magneto-displacement sensor according to claim 7, wherein the output system adaptive coding step: the signal processing module reads the output type of the output system selection unit; Mapping the new displacement into unified internal coding Xcode; the unified internal code Xcode is input to an output system selection unit.
9. The method for controlling an analog-digital integrated output circuit of a magneto-displacement sensor as claimed in claim 8, further comprising the step of analog output dynamic matching feedback: if the output type is current output, the signal processing module regulates and controls the programmable current source circuit to enable an output interval of the current output to be automatically linearized; if the output type is voltage output, controlling zero and fullness of the voltage output through a programmable voltage amplifying circuit; the analog signal output module feeds back the real-time working point to the signal processing module; And the signal processing module re-acquires the corrected variable domain time difference for the abnormal drift triggering variable domain time matching and drift suppression step.
10. The method for controlling an analog-digital integrated output circuit of a magneto-displacement sensor as claimed in claim 9, further comprising a digital output redundancy check step of: the signal processing module converts the new displacement into an RS485 data frame; the digital signal output module executes readback verification on the RS485 data frame, and if the readback verification fails, the echo multidimensional acquisition and the confidence constructing step are sampled again; if the continuous read-back verification fails, the feedback is sent to the excitation self-calibration triggering step to turn up the excitation pulse.

Description

Analog-digital integrated output circuit of magneto-displacement sensor and control method Technical Field The invention belongs to the technical field of magneto-displacement sensors, and particularly relates to an analog-digital integrated output circuit of a magneto-displacement sensor and a control method. Background In the prior art, magnetostrictive displacement sensors are widely applied to industrial scenes such as hydraulic control, injection molding machine positioning, mechanical stroke detection, process automation measurement and the like, and output circuits of the magnetostrictive displacement sensors usually adopt a 'split design architecture', namely an excitation circuit, an echo signal acquisition circuit, a signal processing unit, an analog output unit (such as 4-20mA and 0-10V) and a digital communication unit (such as RS 485/Modbus) are respectively designed into independent circuits or independent model products, and the circuit architecture, functional interfaces and signal links among different model products have obvious differences and cannot be generalized and integrated on the same circuit board. When facing various industrial control systems, the manufacturing enterprises must design a plurality of different models such as 'current output type', 'voltage output type', 'digital output type', even 'current+digital type', and the like, so that the number of the PCB boards is increased, the stock and stock pressure is increased, the supply chain management is complex, and the maintenance cost is increased. Therefore, a technical solution is needed to solve the above technical problems. Disclosure of Invention In order to solve the above technical problems, the present invention provides an analog-digital integrated output circuit of a magneto-displacement sensor, comprising: The signal excitation module is used for providing excitation pulse or excitation current for the magneto-induced displacement sensor so as to enable the magneto-induced displacement sensor to generate a magnetostriction displacement response signal which can be acquired; The signal acquisition module is connected with the signal excitation module and is used for amplifying, filtering and analog-to-digital converting the magnetostriction displacement response signal returned by the magnetostriction displacement sensor to obtain a digitized magnetostriction displacement response signal; The signal processing module is connected with the signal acquisition module and is used for carrying out displacement calculation, linearization compensation, temperature drift correction and hardware delay correction on the digitized magnetostriction displacement response signal; The analog signal output module is connected with the signal processing module and is used for generating a plurality of analog signals of an output type according to the output result of the signal processing module and outputting at least one analog signal of the output type, wherein the analog signals of the output type comprise a plurality of current outputs or a plurality of voltage outputs; the digital signal output module is connected with the signal processing module and is used for outputting the digitized magnetostriction displacement response signal in a digital communication protocol; and the output system selection unit is used for configuring the output types of the analog signal output module and the digital signal output module, so that the same circuit board can select different output types according to application requirements. Further, the signal excitation module comprises a constant current source, an excitation controller and a time reference unit, wherein the time reference unit is used for providing a unified clock reference required by displacement calculation for the signal processing module. Further, the signal acquisition module comprises a pre-amplifier, a low-noise filter and a high-resolution ADC (analog to digital converter), and is used for carrying out noise suppression and high-precision digitization on the magnetostrictive echo signals. Further, the analog signal output module comprises a programmable current source circuit and a programmable voltage amplifying circuit, and the signal processing module controls the output type of the analog signal output module through a mode configuration register. Furthermore, the digital signal output module adopts an isolated transceiver structure so as to improve anti-interference performance and long-distance transmission stability. Further, the output system selection unit comprises a dial switch, a jumper wire and a programmable electronic switch, and is used for selecting a corresponding output type according to production requirements. The invention also provides a control method of the analog-digital integrated output circuit of the magneto-displacement sensor, which comprises the following steps: The signal processing module generates an excitation pulse instruction acco