lvdt measuring circuit and its measuring method
A technology of measuring circuit and sampling circuit, which is applied in measuring devices, electromagnetic measuring devices, electric/magnetic position measurement, etc., can solve the problems of easy introduction of errors and drift, poor compensation accuracy, poor calibration accuracy, etc., and achieve zero-point residual voltage compensation , Avoid component tolerances and reduce measurement errors
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Embodiment 1
[0049] The present invention provides a kind of measuring circuit of LVDT, it comprises:
[0050] Sinusoidal pulse width modulator 10, which is used to output a rectangular wave signal with adjustable pulse width and frequency; the pulse width of the rectangular wave signal is adjusted by sine;
[0051]A signal conditioning circuit 20, whose input terminal is connected to the sinusoidal pulse width modulator 10, is used to sequentially filter and amplify the rectangular wave signal to output a sinusoidal wave signal with adjustable amplitude and frequency;
[0052] A linear differential transformer 30, the primary coil 31 of which is connected to the output terminal 20 of the signal conditioning circuit to receive a sine wave signal as an LVDT excitation signal, and the secondary coil 32 outputs an LVDT differential signal;
[0053] The first sampling circuit 40, whose input end is connected to the primary coil 31, is used for sampling the LVDT excitation signal;
[0054] a s...
Embodiment 2
[0064] On the basis of Embodiment 1, this embodiment provides a measurement method based on an LVDT measurement circuit, which includes the following steps:
[0065] S1, the sinusoidal pulse width modulator generates a rectangular wave signal with adjustable pulse width and frequency, which is processed by the signal conditioning circuit and outputs a sinusoidal signal with adjustable amplitude and frequency to the primary coil of the linear differential transformer;
[0066] S2, the sinusoidal pulse width modulator generates a rectangular wave signal with adjustable pulse width and frequency, which is processed by the signal conditioning circuit, and outputs a sinusoidal signal with adjustable amplitude and frequency to the primary coil of the linear differential transformer;
[0067] S3, simultaneously sampling the LVDT excitation signal input by the primary coil and the LVDT differential signal output by the secondary coil, and removing the DC bias;
[0068] S4, performing ...
Embodiment 3
[0082] On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a specific embodiment of the LVDT measurement circuit and its measurement method.
[0083] Taking the MHR500LVDT sensor as an example, the LVDT measurement circuit uses a sine wave excitation with an excitation frequency of 2.5kHz and an effective value of 3V, and the controller 60 uses NXP microcontroller LPC1768. The LPC1768 integrates a PWM (Pulse Width Modulation, pulse width modulation) module, which can be used to generate a SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) signal, which is equivalent to the sinusoidal pulse width modulator 10 of the present invention. The clock frequency of the PWM module is set to 96MHz, and the PWM period register NT is set to 119, so the frequency f of the PWM signal PWM for:
[0084]
[0085] Use the internal general-purpose timer interrupt of LPC1768 to set its interrupt frequency f INT 80kHz. In the interrupt service, the...
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