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Digital circuit for detecting disconnection of displacement sensor LVDT and detection method thereof

A displacement sensor and digital circuit technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as hidden faults, inability to correctly and timely identify signal faults, and no disconnection detection function, etc., to achieve convenient application, high The effect of flexibility

Active Publication Date: 2010-07-28
GUODIAN NANJING AUTOMATION
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Problems solved by technology

[0005] However, due to the limitations of the existing analog circuit conversion methods, these two methods do not have the function of disconnection detection, and cannot correctly and timely judge the signal failure situation in the event of wiring failure or LVDT failure.
In some applications with high reliability requirements, such as liquid level measurement of DEH system, etc., when the signal is disconnected, it cannot be judged in time and accurately, which will cause a great potential failure

Method used

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  • Digital circuit for detecting disconnection of displacement sensor LVDT and detection method thereof
  • Digital circuit for detecting disconnection of displacement sensor LVDT and detection method thereof
  • Digital circuit for detecting disconnection of displacement sensor LVDT and detection method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] 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.

[0023] 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 ad...

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Abstract

The invention discloses a digital circuit for detecting disconnection of a displacement sensor LVDT and a detection method thereof. The digital circuit comprises the displacement sensor LVDT, wherein an LVDT primary coil is connected with an excitation signal source. The digital circuit is characterized in that: an output end of a secondary coil of the displacement sensor LVDT is connected with a test signal and an analog-digital conversion chip simultaneously; an analog-digital converter is connected with a singlechip; and the singlechip is connected with the analog-digital conversion chip and / or a receiving and transmitting device. Through the control of singlechip software, the measurement and acquisition of signals and the judgment of the disconnection state are completed by a software algorithm and intelligent control can be realized.

Description

technical field [0001] The invention relates to a digital circuit and a detection method for detecting a disconnection of a displacement sensor LVDT in an industrial control system, and is specifically applied to the position measurement of some industrial control systems with high reliability requirements, such as a digital electro-hydraulic control system (DEH). The liquid level measurement belongs to the technical field of electric power system automatic control. Background technique [0002] LVDT (Linear Variable Differential Transformer) is the abbreviation of Linear Variable Differential Transformer. The working principle is simply a movable iron core transformer. It consists of a primary coil, two secondary coils, iron core, coil bobbin, casing and other components. When the iron core moves from the middle to both sides, the difference between the output voltages of the two secondary coils is linear with the movement of the iron core. LVDT is mainly used to measure...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01B7/02
Inventor 王丹麟
Owner GUODIAN NANJING AUTOMATION
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