LVDT (linear variable differential transformer) sinusoidal excitation signal generating circuit

Abstract

The invention discloses an LVDT (linear variable differential transformer) sinusoidal excitation signal generating circuit which comprises a fully-differential attenuator and amplifier chip, a single-pole double-throw switch, a primary coil, a first secondary coil, a second secondary coil, a filter capacitor, a gain resistor, a gain potentiometer and an instrument amplifier chip. The fully-differential attenuator and amplifier chip comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin and a ninth pin, and the ninth pin and the eighth pin are connected with the single-pole double-throw switch; the fifth pin is connected with a same-name end of the primary coil; the sixth pin is connected with a non-same-name end of the primary coil; the instrument amplifier chip comprises an eleventh pin, a twelfth pin, a thirteenth pin, a fourteenth pin, a fifteenth pin, a sixteenth pin, a seventeenth pin and an eighteenth pin, and the twelfth pin is connected with a same-name end of the second secondary coil; the thirteenth pin is connected with a same-name end of the first secondary coil. The LVDT sinusoidal excitation signal generating circuit has the technical advantages that the driving capacity of LVDT sinusoidal excitation signals can be improved, common-mode noise can be suppressed, the common-mode rejection ratio can be increased, the performance can be enhanced, and the volume of the LVDT sinusoidal excitation signal generating circuit can be reduced.

Description

technical field [0001] The invention relates to an excitation signal generation circuit, in particular to an LVDT sinusoidal excitation signal generation circuit. Background technique [0002] LVDT (Linear Variable Differential Transformer) refers to a linear variable differential transformer, which belongs to a linear displacement sensor. The working principle is simply a transformer with a movable iron core. It contains a primary coil, two secondary coils, iron core, bobbin and case. After the primary coil of the LVDT sensor is excited by a sine wave signal with driving capability, the corresponding output signal can be obtained from the secondary coil of the LVDT. If the drive capability of the sine wave signal is insufficient, the excitation signal will be distorted, which will affect the output signal of the LVDT. Therefore, it is necessary to add a driver to improve the drive capability of the signal. Contents of the invention [0003] The purpose of the present i...

AI Technical Summary

Problems solved by technology

If the driving ability of the sine wave signal is insufficient, the excitation signal will be distorted, which will affect the output signal of the LVDT. Therefore, it is necessary to add a driver to improve the driving ability of the signal.

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