Analog circuit and method for detecting wire breaking of displacement sensor LVDT

A displacement sensor and analog circuit technology, applied in the direction of measuring electrical variables, measuring current/voltage, instruments, etc., can solve problems such as hidden faults, inability to correctly and timely judge signal faults, and lack of disconnection detection functions, etc. The method is simple reliable effect

Active Publication Date: 2010-07-07
GUODIAN NANJING AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows an electricity meter to accurately determine if there are any problems with its movement or position sensors by measuring their changes over time without having them connected wirelessly. It simplifies the process while still being accurate enough that it won't be affected negatively during normal use.

Problems solved by technology

Technological Problem: Current technical problem addressed in this patented technology relates to improving the accuracy and speed at detecting signals connected incorrectly during installation/failure situations caused by faults like wire breakage or LVCT connection issues that may lead to significant safety hazards associated with critical equipment.

Method used

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  • Analog circuit and method for detecting wire breaking of displacement sensor LVDT
  • Analog circuit and method for detecting wire breaking of displacement sensor LVDT
  • Analog circuit and method for detecting wire breaking of displacement sensor LVDT

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Embodiment Construction

[0030] figure 1 The principle of LVDT measurement is explained. Add a certain frequency of alternating current to the primary coil P of LVDT. When the LVDT iron core moves, the output voltage difference between the two secondary coils has a linear relationship with the displacement of the iron core. When the iron core is in the middle of the secondary windings S1 and S2, E1=E2, the output voltage is 0. When the iron core moves toward S1, E1>E2; when the iron core moves toward S2, E2>E1. Therefore, the output voltage can be collected and converted according to the linear relationship between the output voltage and the displacement of the iron core to obtain the displacement of the iron core.

[0031] figure 2 The measurement principle of the commonly used LVDT transmitter is explained. The LVDT measurement circuit can also be directly replaced by the LVDT signal adjustment system AD598. OSC is an excitation signal of a certain frequency, and the alternating current is applied

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Abstract

The invention discloses an analog circuit for detecting the wire breaking of a displacement sensor LVDT, which comprises a displacement sensor LVDT, wherein a primary coil of the displacement sensor LVDT is connected with an excitation signal source. The analog circuit for detecting the wire breaking of the displacement sensor LVDT is characterized in that the output ends of the secondary coils of the displacement sensor LVDT are respectively connected with a test signal and are respectively connected with a multi-channel selection switch through a filter and rectifier circuit, and predetermined different groups and combinations of wire breaking voltages which are output when an LVDT is disconnected are simultaneously connected with the multi-channel selection switch; the two output end voltages of the secondary coils of the LVDT are respectively combined with a group of comparison voltages to be connected with each comparator, and each comparator is connected with the output control end of the multi-channel selection switch through an arithmetic logic OR unit, and the multi-channel selection switch is simultaneously connected with a servo amplifier. The invention can directly achieve the detection of wire breaking state only by a hardware circuit, and the method is simple and reliable.

Description

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Claims

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Application Information

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Owner GUODIAN NANJING AUTOMATION
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