CN214410266U - Multifunctional high-precision position and angle sensor real-time digital demodulation system - Google Patents
Multifunctional high-precision position and angle sensor real-time digital demodulation system Download PDFInfo
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- CN214410266U CN214410266U CN202120578611.XU CN202120578611U CN214410266U CN 214410266 U CN214410266 U CN 214410266U CN 202120578611 U CN202120578611 U CN 202120578611U CN 214410266 U CN214410266 U CN 214410266U
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Abstract
一种多功能高精度位置和角度传感器实时数字解调系统，属于位置/角度测量系统的技术领域，其特征在于：包括激励电路、监控电路、调理电路、BIT电路和FPGA模块；所述调理电路包括依次电连接的差分放大模块、低通滤波模块和程控放大模块；所述程控放大模块与前述模拟数字转换器相电连接。通过调理电路实现传感器输入信号的放大及信号质量提升；通过激励电路提供激励源；通过监控电路在运行状态下对位置和角度传感器进行在线实时监控；通过BIT电路实现在上电等状态下的自检，以提高系统的测试性；本实用新型所述的多功能高精度位置和角度传感器实时数字解调系统实时性强、测量精度高，可有效抑制温漂、消除零点误差。
A multifunctional high-precision position and angle sensor real-time digital demodulation system, belonging to the technical field of position/angle measurement systems, is characterized in that: comprising an excitation circuit, a monitoring circuit, a conditioning circuit, a BIT circuit and an FPGA module; the conditioning circuit It includes a differential amplifying module, a low-pass filtering module and a program-controlled amplifying module that are electrically connected in sequence; the program-controlled amplifying module is electrically connected to the aforementioned analog-to-digital converter. The sensor input signal is amplified and the signal quality is improved through the conditioning circuit; the excitation source is provided through the excitation circuit; the online real-time monitoring of the position and angle sensors is carried out through the monitoring circuit in the running state; the BIT circuit is used to realize the automatic operation under power-on and other states. to improve the testability of the system; the multifunctional high-precision position and angle sensor real-time digital demodulation system of the utility model has strong real-time performance and high measurement accuracy, and can effectively suppress temperature drift and eliminate zero point errors.
Description
Technical Field
The utility model belongs to the technical field of position/angle measurement system, especially, relate to a real-time digital demodulation system of multi-functional high accuracy position and angle sensor.
Background
Linear Variable Differential Transformer (LVDT)/Rotary Variable Differential Transformer (RVDT) as position and angle sensors have many advantages of frictionless measurement, infinite mechanical life, infinite resolution, robustness, strong environmental adaptability, etc., and are widely applied to flight control systems, the output signal of the sensor is an analog signal, and the traditional analog demodulation open loop control has poor conversion accuracy, low linearity and single function.
Disclosure of Invention
The utility model aims at solving the above problem, provide a multi-functional high accuracy position and the real-time digital demodulation system of angle sensor that real-time nature is strong, measurement accuracy is high.
The utility model discloses a real-time digital demodulation system of multi-functional high accuracy position and angle sensor, including excitation circuit, monitoring circuit, conditioning circuit, BIT circuit and FPGA module; the excitation circuit and the BIT circuit are electrically connected with the FPGA module; an analog-digital converter is arranged between the monitoring circuit and the FPGA module; the monitoring circuit and the conditioning circuit are electrically connected with the analog-digital converter; the analog-digital converter is electrically connected with the FPGA module; the conditioning circuit comprises a differential amplification module, a low-pass filtering module and a program control amplification module which are electrically connected in sequence; the program control amplification module is electrically connected with the analog-digital converter. Signals output by the position and angle sensors are subjected to differential amplification, so that common-mode interference is effectively reduced; and then high-frequency interference signals are filtered by a low-pass filter circuit, and signals reaching the analog-digital converter are enabled to always reach the input full-scale range by a program control amplifier in order to ensure that the measuring circuit obtains higher resolution at the zero nonlinear part and facilitate later error control.
Furthermore, the utility model discloses a multi-functional high accuracy position and angle sensor real-time digital demodulation system, excitation circuit includes DDS module and the drive amplifier circuit that electricity is connected in proper order; the DDS module is electrically connected with the FPGA; the monitoring circuit comprises a summing module and a proportional amplification module which are electrically connected in sequence; the proportional amplification module is electrically connected with the analog-digital converter; the BIT circuit comprises a standard source and an analog switch which are electrically connected in sequence.
Further, the real-time digital demodulation system of multi-functional high accuracy position and angle sensor, the input signal scope of monitoring circuit and conditioning circuit is +12V to-12V.
Further, the utility model discloses a multi-functional high accuracy position and angle sensor real-time digital demodulation system, the low pass filter module is provided with 4 th order low pass filter; the cut-off frequency of the low-pass filter is 50kHz, and the low-pass filter is used for improving the signal quality and facilitating the acquisition of a post-stage circuit.
Further, multi-functional high accuracy position and angle sensor real-time digital demodulation system, the programmable logic device of XILINX is adopted to the FPGA module for functions such as configuration, on-line monitoring, BIT's of algorithm demodulation, excitation source detect.
The utility model discloses a real-time digital demodulation system of multi-functional high accuracy position and angle sensor realizes the amplification and the signal quality promotion of sensor input signal through the conditioning circuit; providing a stimulus source through a stimulus circuit; the position and angle sensors are monitored on line in real time in an operating state through a monitoring circuit; the self-checking under the power-on state and other states is realized through the BIT circuit so as to improve the testability of the system; real-time digital demodulation system of multi-functional high accuracy position and angle sensor strong in instantaneity, measurement accuracy is high, can effectively restrain the temperature drift, eliminate zero point error.
Drawings
FIG. 1 is a schematic structural view of a real-time digital demodulation system for a multi-functional high-precision position and angle sensor according to the present invention;
fig. 2 is a schematic circuit diagram of a low-pass filter module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a BIT circuit according to the embodiment of the present invention.
Detailed Description
The multi-functional high-precision position and angle sensor real-time digital demodulation system of the present invention is described in detail with reference to the accompanying drawings and embodiments.
The real-time digital demodulation system of the multifunctional high-precision position and angle sensor in the embodiment of the disclosure comprises an excitation circuit, a monitoring circuit, a conditioning circuit, a BIT circuit and an FPGA module as shown in FIG. 1; the excitation circuit and the BIT circuit are electrically connected with the FPGA module; an analog-digital converter is arranged between the monitoring circuit and the FPGA module; the monitoring circuit and the conditioning circuit are electrically connected with the analog-digital converter; the analog-digital converter is electrically connected with the FPGA module; the conditioning circuit comprises a differential amplification module, a low-pass filtering module and a program control amplification module which are electrically connected in sequence; the program control amplification module is electrically connected with the analog-digital converter; the FPGA module is electrically connected with an upper computer through an RS422 interface.
The excitation circuit of the embodiment of the present disclosure includes a DDS module and a driving amplifier circuit electrically connected in sequence; the DDS module is electrically connected with the FPGA; the monitoring circuit comprises a summing module and a proportional amplification module which are electrically connected in sequence; the proportional amplification module is electrically connected with the analog-digital converter; the BIT circuit comprises a standard source and an analog switch which are electrically connected in sequence. The position and angle sensors in the disclosed embodiments are LVDTs/RVDTs; the input signal range of the monitoring circuit and the conditioning circuit is +12V to-12V; as shown in fig. 2, the low-pass filtering module is provided with a 4-order low-pass filter; the cut-off frequency of the low-pass filter is 50kHz, so that the signal quality is improved, and the acquisition of a post-stage circuit is facilitated; the FPGA module adopts a XILINX programmable logic device and is used for the functions of algorithm demodulation, excitation source configuration, online monitoring, BIT detection and the like; the BIT circuit structure of this embodiment is shown in fig. 3.
In the embodiment of the disclosure, the conditioning circuit is composed of a differential amplification module, a low-pass filtering module and a program control amplification module; the differential amplification module is used for amplifying and sampling the output signals of the LVDT/RVDT and is used for filtering the common-mode interference of the output signals of the LVDT/RVDT and improving the signal quality; the low-pass filtering module is used for filtering input signals and filtering high-frequency interference of output signals of the LVDT/RVDT, and a 4-order low-pass filter with the cut-off frequency of 50kHz is arranged in the embodiment of the disclosure and used for improving the signal quality and facilitating the acquisition of a later circuit. The program control amplification module is used for obtaining higher resolution at the zero nonlinear part, and when the FPGA detects that the amplitude of an input signal is lower, the amplification factor of the input signal is improved through the program control amplification circuit, so that the resolution of the system at the zero nonlinear part is improved, and later-stage error control is facilitated.
The analog-to-digital converter ADC is used to complete the acquisition from the analog circuit to the digital circuit. The excitation circuit is used for generating an excitation source of the LVDT/RVDT, a direct digital synthesizer DDS circuit is adopted, and signals such as the amplitude, the frequency and the like of the excitation source are changed in real time in a program according to the sampling amplitude, so that the high-precision demodulation requirement of the sensor is met. The monitoring circuit is used for monitoring the health state of the LVDT/RVDT sensor in real time on line, and the on-line real-time monitoring of the system on the key sensor LVDT/RVDT in the running state is improved. The BIT circuit is used for self-checking in power-on and other states and is used for improving the testability of the system. The FPGA module is used for the functions of algorithm demodulation, excitation source configuration, online monitoring, BIT detection and the like. And the RS422 is used for communication of board card data to finish demodulation signals and signal return of the health state of the sensor.
The signal output by the LVDT/RVDT sensor is differentially amplified,common mode interference is effectively reduced; and high-frequency interference signals are filtered by the low-pass filter circuit, so that the measuring circuit obtains higher resolution at the zero nonlinear part, the later error control is facilitated, and the signals reaching the analog-digital converter can always reach the input full range by the program control amplifier. In the specific implementation process, the relation between the sampling frequency and the improved conversion bit number is f through an oversampling technologyos=4n*fsWherein f isosFor oversampling frequency, fsThe lowest frequency required for initial sampling; the sampling frequency was set to 500kHz and the number of conversion bits increased was about 2 bits. And after the signals are converted by the ADC, the signals are converted into digital signals, and then the digital signals are processed by adopting a Goertzel algorithm. And sampling for several periods, taking the average value as RVDT/LVDT output, and performing error compensation to serve as the calculated output amplitude. The amplitude of the excitation signal can be changed by controlling the DDS in real time through the FPGA, so that the amplitude of the back-sampling signal is changed, a closed loop is formed, and the sampling precision can be effectively improved.
Claims (5)
1. The utility model provides a real-time digital demodulation system of multi-functional high accuracy position and angle sensor which characterized in that: the device comprises an excitation circuit, a monitoring circuit, a conditioning circuit, a BIT circuit and an FPGA module; the excitation circuit and the BIT circuit are electrically connected with the FPGA module; an analog-digital converter is arranged between the monitoring circuit and the FPGA module; the monitoring circuit and the conditioning circuit are electrically connected with the analog-digital converter; the analog-digital converter is electrically connected with the FPGA module; the conditioning circuit comprises a differential amplification module, a low-pass filtering module and a program control amplification module which are electrically connected in sequence; the program control amplification module is electrically connected with the analog-digital converter.
2. The multi-functional high precision position and angle sensor real-time digital demodulation system of claim 1, wherein: the excitation circuit comprises a DDS module and a driving amplification circuit which are electrically connected in sequence; the DDS module is electrically connected with the FPGA; the monitoring circuit comprises a summing module and a proportional amplification module which are electrically connected in sequence; the proportional amplification module is electrically connected with the analog-digital converter; the BIT circuit comprises a standard source and an analog switch which are electrically connected in sequence.
3. The multi-functional high precision position and angle sensor real-time digital demodulation system of claim 2, wherein: the input signal range of the monitoring circuit and the conditioning circuit is +12V to-12V.
4. The multi-functional high precision position and angle sensor real-time digital demodulation system of claim 3, wherein: the low-pass filtering module is provided with a 4-order low-pass filter; the cut-off frequency of the low-pass filter is 50 kHz.
5. The multi-functional high precision position and angle sensor real-time digital demodulation system of claim 4, wherein: the FPGA module adopts a XILINX programmable logic device.
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| CN202120578611.XU CN214410266U (en) | 2021-03-22 | 2021-03-22 | Multifunctional high-precision position and angle sensor real-time digital demodulation system |
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| CN202120578611.XU CN214410266U (en) | 2021-03-22 | 2021-03-22 | Multifunctional high-precision position and angle sensor real-time digital demodulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136345A (en) * | 2021-11-26 | 2022-03-04 | 南京晨光集团有限责任公司 | LVDT/RVDT analog demodulation circuit |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136345A (en) * | 2021-11-26 | 2022-03-04 | 南京晨光集团有限责任公司 | LVDT/RVDT analog demodulation circuit |
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