CN110907693A - Compact peripheral interconnection bus board card - Google Patents
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- CN110907693A CN110907693A CN201911259642.2A CN201911259642A CN110907693A CN 110907693 A CN110907693 A CN 110907693A CN 201911259642 A CN201911259642 A CN 201911259642A CN 110907693 A CN110907693 A CN 110907693A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention provides a compact peripheral interconnection bus board card which is used for voltage testing and comprises a micro control unit and a plurality of measuring units; the micro control unit is used for controlling the plurality of measuring units; the measuring unit comprises an analog-to-digital conversion measuring module, a signal conditioning module and an input channel module; the input channel module is used for sending the signal to be measured to the signal conditioning module; the signal conditioning module is used for processing the received signal to be measured to obtain data to be measured and sending the data to be measured to the analog-to-digital conversion measuring module; the analog-to-digital conversion measurement module is used for sampling the data to be measured to obtain sampling data and sending the sampling data to the micro control unit; the micro-control unit is used for calculating a voltage measurement result according to the sampling data. The compact peripheral interconnection bus board card provided by the embodiment of the invention realizes the parallel test capability and improves the stability, consistency and anti-interference capability of voltage signal measurement.
Description
Technical Field
The invention relates to the field of compact peripheral interconnection bus board cards, in particular to a compact peripheral interconnection bus board card.
Background
With the progress of science and technology, the test equipment is developed towards miniaturization and specialization. Compact Peripheral Component Interconnect (CPCI) bus products have the advantages of fast speed, small size, high test accuracy, modularization, and the like, and are one of the most promising buses. The CPCI bus is widely applied to the fields of aerospace tests, industrial automation tests and the like. The voltage measurement is the measurement of the basic parameters of the measured object. The test equipment has the capability of performing single-repetition test, polling test and parallel test on the voltage parameters of the tested single machine. The conventional CPCI bus board card is only provided with a group of floating measurement combined modules generally and cannot carry out dual-channel parallel test on a tested device. The existing CPCI bus board card for measuring voltage also has the problems of low test precision, poor real-time performance, poor stability and the like.
Therefore, how to ensure the accuracy and consistency of voltage signal measurement and the reliability and stability of the board as a test device while realizing the parallel test capability of the CPCI bus board becomes a technical problem to be solved by those skilled in the art and the focus of research all the time.
Disclosure of Invention
In view of this, embodiments of the present invention provide a compact peripheral interconnection bus board, so as to solve the problems in the prior art that the compact peripheral interconnection bus board cannot perform parallel testing, and is low in testing precision, poor in real-time performance, and poor in stability.
The embodiment of the invention provides a compact peripheral interconnection bus board card which comprises a micro control unit and a plurality of measuring units; wherein the micro control unit is used for controlling the plurality of measuring units;
the measuring unit comprises an analog-to-digital conversion measuring module, a signal conditioning module and an input channel module;
the input channel module is used for sending a signal to be detected to the signal conditioning module;
the signal conditioning module is used for processing the received signal to be measured to obtain data to be measured and sending the data to be measured to the analog-to-digital conversion measuring module;
the analog-to-digital conversion measurement module is used for sampling the data to be measured to obtain sampling data and sending the sampling data to the micro control unit;
the micro control unit is used for calculating a voltage measurement result according to the sampling data.
Further, the measuring unit also comprises an independent power supply system;
the power supply system adopts an independent floating design.
Further, the input channel module comprises a photoelectric coupling relay;
and the micro control unit controls the on-off of the input channel module through the photoelectric coupling relay.
Furthermore, the signal conditioning module comprises a passive filter module, a range conversion module, an active filter module and an internal measurement reference and external measurement switching module;
the passive filter module is used for performing passive filtering on the signal to be measured to obtain first data and sending the first data to the range conversion module;
the range conversion module is used for carrying out range conversion on the first data to obtain second data and sending the second data to the active filter module;
the active filter module is used for carrying out active filtering on the second data to obtain data to be measured and sending the data to be measured to the internal measurement reference and external measurement switching module;
the working mode of the internal measurement reference and external measurement switching module comprises the following steps: two working modes of internal reference measurement and external measurement are adopted;
and when the internal measurement reference and external measurement switching module works in an external measurement working mode, the internal measurement reference and external measurement switching module is used for sending the data to be measured to the analog-to-digital conversion measurement module.
Furthermore, the range conversion module adopts an electromagnetic relay to realize gear switching;
the input impedance of each gear of the range conversion module is not lower than 10M omega.
Further, the number of the measurement units in the plurality of measurement units is two.
Further, the device also comprises a programmable logic device module and a bus module;
the bus module, the input channel module, the analog-to-digital conversion measurement module, the passive filter module, the range conversion module, the active filter module, and the intellectual property cores of the internal measurement reference and external measurement switching module are integrated in the programmable logic device module;
the micro control unit is used for controlling the intellectual property core integrated in the programmable logic device module.
Further, the micro control unit is also used for controlling any one test unit in the plurality of test units to work.
Further, the micro control unit is also used for controlling any two test units in the plurality of test units to work simultaneously.
Further, the micro control unit is also used for controlling the plurality of measuring units to work according to a preset sequence.
The compact peripheral interconnection bus board card provided by the embodiment of the invention realizes the functions of hardware control and data acquisition through the micro control unit, and reduces the burden of an upper computer on data acquisition and hardware control. The timing precision of the micro control unit is superior to that of an upper computer, so that the stability and consistency of test results are improved. The compact peripheral interconnection bus board card provided by the embodiment of the invention has the advantages that different measuring units are not grounded, so that mutual interference among a plurality of measuring units due to voltage differences can be avoided. The compact peripheral interconnection bus board card provided by the embodiment of the invention adopts a photoelectric coupling relay to control the on-off of an input channel. The photoelectric coupling relay is not interfered by an electric field and a magnetic field, and the reliable isolation of input and output can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a CPCI bus board card according to an embodiment of the present invention.
Fig. 2 is a flow chart of single-channel test of the CPCI bus board card according to the embodiment of the present invention.
Fig. 3 is a flowchart of polling test of the CPCI bus board according to the embodiment of the present invention.
Fig. 4 is a flowchart of parallel testing of CPCI bus board cards according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the invention provides a CPCI bus board card for voltage testing, which comprises a Micro Control Unit (MCU) and a plurality of measuring units controlled by the MCU. The measuring unit comprises an Analog-to-Digital Converter (ADC) measuring module, a signal conditioning module and an input channel module. The input channel module is used for sending the signal to be measured to the signal conditioning module. The signal conditioning module is used for processing the received signal to be measured to obtain data to be measured and sending the data to be measured to the ADC measuring module. The ADC measuring module is used for sampling the data to be measured to obtain sampling data and sending the sampling data to the MCU. The MCU is used for calculating a voltage measurement result according to the sampling data. The conventional CPCI bus board card is only provided with a group of floating measurement combined modules generally and cannot perform parallel test on the tested equipment. The CPCI bus board card provided by the embodiment of the invention comprises a plurality of measuring units and can be used for carrying out parallel test on the tested equipment. The CPCI bus board card provided by the embodiment of the invention realizes the function of data acquisition through the MCU, and reduces the burden of an upper computer on data acquisition. The different measurement units of the CPCI bus board card provided by the embodiment of the invention are not in common ground, so that mutual interference among a plurality of measurement units due to voltage differences can be avoided.
In an optional embodiment, the signal conditioning module comprises a passive filter module, a range conversion module, an active filter module and an internal measurement reference and external measurement switching module; the passive filter module is used for carrying out passive filtering on a signal to be measured to obtain first data and sending the first data to the range conversion module; the range conversion module is used for carrying out range conversion on the first data to obtain second data and sending the second data to the active filter module; the active filter module is used for carrying out active filtering on the second data to obtain data to be measured and sending the data to be measured to the internal measurement reference and external measurement switching module; the working mode of the internal measurement reference and external measurement switching module comprises the following steps: two working modes of internal reference measurement and external measurement are adopted; and when the internal measurement reference and external measurement switching module works in the external measurement working mode, the internal measurement reference and external measurement switching module is used for sending the data to be measured to the ADC measurement module.
Fig. 1 is a block diagram of a CPCI bus board card according to an embodiment of the present invention. As shown in fig. 1, the CPCI bus board includes an MCU, a Programmable logic device (FPGA) module, a bus module, and two test units. The test unit comprises an input channel module, a passive filter module, a range conversion module, an active filter module, an internal measurement reference and external measurement switching module and an ADC (analog to digital converter) measurement module which are sequentially connected. The ADC measuring module preferably uses software to configure the sampling rate and the number of sampling points in a program-controlled manner, so that the consistency and the stability of the test are improved. The bus module, the input channel module, the passive filter module, the range conversion module, the internal measurement reference of the active filter module, the external measurement switching module and the Intellectual Property core (IP core for short) of the ADC measurement module are integrated in the FPGA module. The MCU controls the corresponding module through an IP core integrated in the FPGA module. The MCU bears the functions of hardware control and data acquisition by controlling the kernel in the FPGA module. The MCU reduces the burden of an upper computer on data acquisition and channel control, and improves the real-time performance of the system. Because the timing precision of the MCU is superior to that of the upper computer, the stability and consistency of the test result are improved.
In an alternative embodiment, the mode of operation of the passive filter module comprises: a pass-through mode and a filter mode. When the passive filter module works in a direct-through mode, the signal to be detected is directly output as first data. When the passive filter module works in a filtering mode, passive filtering is carried out on the signal to be detected to obtain first data. The range conversion module is used for carrying out range conversion on the first data to obtain second data. The active filter comprises the following working modes: a pass-through mode and a filter mode. And when the active filter module works in a direct-through mode, the second data is directly output as the data to be detected. When the active filter module works in a filtering mode, the second data is subjected to active filtering to obtain data to be detected, and the sampling stability of the rear-stage ADC measuring module is improved. The use of the active filter and the passive filter can effectively improve the stability and consistency of the voltage acquisition of the board card. The working mode of the internal measurement reference and external measurement switching module comprises the following steps: the internal reference measurement and the external measurement are in two working modes. Whether the ground board card measuring channel works normally or not and whether zero offset and full offset are in a calibration range or not can be judged through internal reference voltage measurement.
In an alternative embodiment, the input channel module employs a photoelectric coupled relay as an analog switch. The MCU controls the on-off of the input channel through a photoelectric coupling relay. The photoelectric coupling relay is not interfered by an electric field and a magnetic field, and the reliable isolation of input and output can be ensured. The range conversion module preferably adopts an electromagnetic relay to realize gear switching. In an optional embodiment, the range conversion module adopts an electromagnetic relay to switch the gear of the first data of +/-200 mV to +/-100V, and the input impedance of each gear is not lower than 10M omega. The high input impedance can effectively reduce the influence of the board card measuring end on the measured signal, and improve the accuracy of the test. The CPCI bus board card provided by the embodiment reduces impedance matching errors introduced to a tested circuit, and improves the accuracy and consistency of testing.
In an alternative embodiment, the measuring unit further comprises a separate power supply system. The power supply system adopts an independent floating design. The different measurement units are not connected in common, so that mutual interference among the measurement units due to voltage differences can be avoided. The measuring unit comprises a control interface adopting an electromagnetic coupling isolation design. The control interface of the electromagnetic coupling isolation design improves the isolation of signal transmission. The stability of the CPCI bus board card is improved through the independent floating design and isolation design.
In an optional embodiment, the MCU is further configured to control any one of the plurality of measurement units to operate. Fig. 2 is a flow chart of single-channel test of the CPCI bus board card according to the embodiment of the present invention. As shown in fig. 2, the control method includes the steps of:
step 1: selecting a measurement unit for testing;
step 2: the MCU controls the input channel module to be communicated through an IP core of the input channel module corresponding to the measuring unit in the FPGA module;
and step 3: the MCU sets the working mode of the passive filter module through the IP core of the passive filter module corresponding to the measurement unit in the FPGA module;
and 4, step 4: the MCU sets the working mode of the active filter module through the IP core of the active filter module corresponding to the measurement unit in the FPGA module;
and 5: the MCU sets the range of the range conversion module through the IP core of the range conversion module corresponding to the measurement unit in the FPGA module;
step 6: the MCU controls the internal measurement reference and the external measurement switching module to work in an external measurement working mode through an internal measurement reference corresponding to a measurement unit in the FPGA module and an IP core of the external measurement switching module;
and 7: the MCU sets the sampling rate and the number of sampling points of the ADC measuring module through an IP core of the ADC measuring module;
and 8: the MCU collects the measurement data and calculates the measurement result;
and step 9: and the MCU sends the measurement result to the upper computer through the IP core of the bus module in the FPGA module.
In an optional embodiment, when the tested device is subjected to single-channel testing, the MCU controls the photoelectric coupling relay to switch the analog voltage signal through the IP core in the FPGA. The maximum value of the on-time of the photoelectric coupling relay is 2ms, and the maximum value of the off-time of the photoelectric coupling relay is 1 ms. The single channel polling time is 3ms per channel.
In an alternative embodiment, the MCU is further adapted to control the plurality of measurement units to operate in a predetermined order. Fig. 3 is a flowchart of polling test of the CPCI bus board according to the embodiment of the present invention. As shown in fig. 3, the polling test control method includes the steps of:
step 1: sequencing the measurement units according to the test sequence;
step 2: the MCU sequentially starts the measurement units to acquire measurement data and calculate measurement results according to the sequence through the FPGA module;
and step 3: and the MCU sends the measurement result to the upper computer through the IP core of the bus module in the FPGA module.
In an optional embodiment, when the device to be tested is subjected to polling test, the MCU sets the measurement sequence of the measurement units participating in the polling test through the IP core in the FPGA, sets whether to use the active filter and the passive filter, selects the corresponding measurement range, and sets the sampling rate and the number of sampling points of the ADC acquisition module. In an alternative embodiment, the measurement time for each channel is the product of the sampling rate of the ADC measurement module and the number of sample points. In an alternative embodiment, the sampling rate of the ADC measurement module is 4 us/point maximum, and the number of programmable points is 65536 point maximum. The MCU coprocessor controls the single-channel measurement time of the ADC measurement module to be 0.004 ms-262 ms. Through the settable sampling rate and the number of sampling points, the stability and consistency of the voltage signal measured by the CPCI bus board card can be improved. The MCU firstly opens the photoelectric coupling relay of the input channel module of the first measuring unit, closes the photoelectric coupling relay of the first measuring unit after the first measuring unit finishes measuring, then opens the photoelectric coupling relay of the input channel module of the second measuring unit, and controls the measuring units participating in the polling test to finish measuring in sequence.
In an alternative embodiment, the MCU is further configured to control any two test units of the plurality of measurement units to operate simultaneously. Fig. 4 is a flowchart of parallel testing of CPCI bus board cards according to an embodiment of the present invention. As shown in fig. 4, the parallel test control method includes the following steps:
step 1: the MCU simultaneously starts the two measurement units through the FPGA module;
step 2: the MCU simultaneously acquires the measurement data of the two measurement units through the FPGA module and calculates the measurement result;
and step 3: and the MCU sends the measurement result to the upper computer through the IP core of the bus module in the FPGA module.
In an alternative embodiment, when the device under test is subjected to the dual-channel parallel test, the signal under test B is a synchronous timing related signal of the signal under test a, and the two signals are not grounded in common. The MCU selects two measuring units through an IP core in the FPGA, sets whether an active filter module and an analog filter module are used or not, and selects a corresponding measuring range. The MCU coprocessor sets the sampling rate and the number of sampling points of the ADC acquisition module through the FPGA module, and the MCU coprocessor module simultaneously starts the voltage acquisition functions of the two measurement units at a set moment, calculates the measurement result and exchanges the measurement result to the memory space of an upper computer through an IP core of a bus module in the FPGA module. At the moment, the upper computer obtains the measured signal A and the measured signal B at the set moment and measures the differential voltage value. Two measurement units adopt two sets of independent power supply systems, can overcome common mode interference, improve the stability of test, adopt digital circuit signal electromagnetic isolation's control technique, improve the reliability of ground integrated circuit board. The use of the filter, the arrangement of high input impedance, programmable setting of sampling rate and point number of the measuring module and programmable selection of the measuring gear improve the accuracy and consistency of the ground board card.
Claims (10)
1. A compact peripheral interconnection bus board card is used for voltage testing and is characterized by comprising a micro-control unit and a plurality of measuring units; wherein the micro control unit is used for controlling the plurality of measuring units;
the measuring unit comprises an analog-to-digital conversion measuring module, a signal conditioning module and an input channel module;
the input channel module is used for sending a signal to be detected to the signal conditioning module;
the signal conditioning module is used for processing the received signal to be measured to obtain data to be measured and sending the data to be measured to the analog-to-digital conversion measuring module;
the analog-to-digital conversion measurement module is used for sampling the data to be measured to obtain sampling data and sending the sampling data to the micro control unit;
the micro control unit is used for calculating a voltage measurement result according to the sampling data.
2. The compact peripheral component interconnect bus board of claim 1, wherein the measurement unit further comprises an independent power supply system;
the power supply system adopts an independent floating design.
3. The compact peripheral interconnect bus board of claim 1, wherein the input channel module comprises a photo-coupled relay;
and the micro control unit controls the on-off of the input channel module through the photoelectric coupling relay.
4. The compact peripheral interconnect bus board of claim 1, wherein the signal conditioning module comprises a passive filter module, a range conversion module, an active filter module, and an internal measurement reference and external measurement switching module;
the passive filter module is used for performing passive filtering on the signal to be measured to obtain first data and sending the first data to the range conversion module;
the range conversion module is used for carrying out range conversion on the first data to obtain second data and sending the second data to the active filter module;
the active filter module is used for carrying out active filtering on the second data to obtain data to be measured and sending the data to be measured to the internal measurement reference and external measurement switching module;
the working mode of the internal measurement reference and external measurement switching module comprises the following steps: two working modes of internal reference measurement and external measurement are adopted;
and when the internal measurement reference and external measurement switching module works in an external measurement working mode, the internal measurement reference and external measurement switching module is used for sending the data to be measured to the analog-to-digital conversion measurement module.
5. The compact peripheral component interconnect bus board of claim 4, wherein the range conversion module employs an electromagnetic relay to implement gear shifting;
the input impedance of each gear of the range conversion module is not lower than 10M omega.
6. The compact peripheral component interconnect bus board of claim 5, wherein the number of said measurement units in said plurality of measurement units is two.
7. The compact peripheral component interconnect bus board of claims 1-6, further comprising a programmable logic device module and a bus module;
the bus module, the input channel module, the analog-to-digital conversion measurement module, the passive filter module, the range conversion module, the active filter module, and the intellectual property cores of the internal measurement reference and external measurement switching module are integrated in the programmable logic device module;
the micro control unit is used for controlling the intellectual property core integrated in the programmable logic device module.
8. The compact peripheral interconnect bus board of claims 1-6, wherein the micro control unit is further configured to control any one of the plurality of measurement units to operate.
9. The compact peripheral interconnect bus board of claims 1-6, wherein the micro control unit is further configured to control any two test units of the plurality of measurement units to operate simultaneously.
10. The compact peripheral interconnect bus board of claims 1-6, wherein the micro control unit is further configured to control the plurality of measurement units to operate in a predetermined order.
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| CN110907693B (en) | 2022-02-01 |
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