CN110580845A - Virtual instrument embedded in comprehensive teaching experiment platform - Google Patents
Virtual instrument embedded in comprehensive teaching experiment platform Download PDFInfo
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- CN110580845A CN110580845A CN201910997067.XA CN201910997067A CN110580845A CN 110580845 A CN110580845 A CN 110580845A CN 201910997067 A CN201910997067 A CN 201910997067A CN 110580845 A CN110580845 A CN 110580845A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
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Abstract
the invention relates to a virtual instrument embedded in a comprehensive teaching experiment platform. The device comprises a high-precision measurement function circuit, a high-speed measurement function circuit and a power supply circuit, wherein the high-precision measurement function circuit, the high-speed measurement function circuit and the power supply circuit are respectively connected with a comprehensive teaching experiment platform. On the basis of meeting the requirements of teaching experiments on functions and performance, the invention can obviously reduce the purchasing cost of schools, reduce the waste of space resources of experiment stations, realize the integration of instruments and teaching equipment and improve the teaching effect.
Description
Technical Field
The invention relates to the field of teaching, in particular to a virtual instrument embedded in a comprehensive teaching experiment platform.
Background
In the advanced education process, especially in the teaching process of the department of industry and science, in order to make students understand the theoretical knowledge in books better, corresponding experiment courses are generally set up. One way is that the teacher demonstrates the relevant knowledge through the teaching equipment; the other mode is that students directly operate teaching equipment to carry out manual experiments, and the understanding of theoretical knowledge is further deepened through the manual experiment process.
At present, the teaching experimental equipment in the market is mainly based on various special small-sized experimental boxes or large-sized experimental tables, these experimental boxes or experimental tables are only concentrated on a certain specific experimental circuit principle, and excitation signals or observation signals required in the experimental process are often required to be matched with independent table type instruments for use, so that more problems can be brought, and the summary is as follows:
1) When a school purchases one set of experimental box or test bed, corresponding desk type instruments can be purchased in a matched manner, and certain purchasing cost is increased;
2) The traditional desk type instrument is generally large in volume and weight, so that the area of an original tense experiment station cannot be reduced, and more space resources are wasted;
3) The traditional desk type instrument is generally designed for scientific research and production, the index of the instrument is generally good, and for teaching application, the index of the traditional desk type instrument is often too high, so that the situation of a big horse-drawn trolley is formed, and resource waste is caused to a certain extent;
4) the communication between traditional desk-top instrument and the experimental box is inconvenient, is unfavorable for improving correlation between them in the experimentation, and then is unfavorable for improving experimental experience, such as synchronism between experimental circuit and the instrument, correlation of experimental circuit data and instrument data and writing of experimental report.
The virtual instrument is different from a traditional instrument, software, namely the instrument is the core idea of the virtual instrument, the virtual instrument does not have a display screen and an operation panel of the traditional instrument, and all the display screen and the operation panel are realized through a virtual software panel. Virtual instruments have three significant advantages over traditional instruments: firstly, because the display screen and the operation panel are removed, the volume and the weight of the instrument are obviously reduced; secondly, because more functions are realized by upper computer software, the software capability can be fully exerted, so that the virtual real-time and post-analysis processing functions are obviously improved; thirdly, the design and the production process are simplified, and the cost is obviously reduced. With the continuous development of instrument technology and information technology, virtual instrument technology is mature and has been applied in large scale in the industrial field, but the application in teaching experiments is not found at present.
Disclosure of Invention
the invention provides a virtual instrument with multiple instrument functions for solving the technical problems in the background technology, the virtual instrument can be embedded into a miniaturized comprehensive teaching experiment platform host, and forms an organic whole with a teaching experiment platform, thereby providing advanced teaching equipment for science and technology teaching of higher education.
the technical solution of the invention is as follows: the invention relates to a virtual instrument embedded in a comprehensive teaching experiment platform, which is characterized in that: the virtual instrument comprises a high-precision measurement function circuit, a high-speed measurement function circuit and a power supply circuit, wherein the high-precision measurement function circuit, the high-speed measurement function circuit and the power supply circuit are respectively connected with the comprehensive teaching experiment platform.
Preferably, the high-precision measurement function circuit comprises an input switching and protecting circuit, a signal conditioning circuit, a high-precision analog-to-digital converter and a first embedded processor, wherein the input switching and protecting circuit is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the high-precision analog-to-digital converter, and the high-precision analog-to-digital converter is connected to the first embedded processor.
Preferably, the high-speed measurement function circuit comprises a second embedded processor, a two-way 14-bit high-speed analog-to-digital converter, a two-way 14-bit high-speed digital-to-analog converter, a programmable gate array, a direction control circuit and a static memory, wherein the programmable gate array is respectively connected with the second embedded processor, the two-way 14-bit high-speed analog-to-digital converter, the two-way 14-bit high-speed digital-to-analog converter, the direction control circuit and the static memory.
Preferably, the high-speed measurement functional circuit further comprises an input protection circuit, an input signal conditioning power supply and an output signal conditioning power supply, the input protection circuit is connected to the input signal conditioning power supply, the input signal conditioning power supply is connected to the two-way 14-bit high-speed analog-to-digital converter, and the two-way 14-bit high-speed digital-to-analog converter is connected to the output signal conditioning power supply.
Preferably, the power supply circuit comprises a third embedded processor, a digital-to-analog converter, a buck converter, a DC/DC and output monitoring and control circuit, the third embedded processor is respectively connected with the digital-to-analog converter and the DC/DC, and is respectively connected with the digital-to-analog converter and the DC/DC through the buck converter output monitoring and control circuit.
According to the invention, through research and analysis on courses of higher education parts, a virtual instrument part has nine common instrument functions such as a universal meter, an oscilloscope, a signal source, a frequency spectrograph, a logic analyzer, a code pattern generator, a multifunctional digital IO, an impedance analyzer and a program control power supply, and a vector network analyzer and a high impedance meter are also used for part of courses. Because the hardware realization principle of partial instrument functions is the same in nine instrument functions, the difference is mainly realized in the realization of a virtual soft panel, and finally three types of functional circuits are determined to realize the nine instruments: high-precision measurement function circuit, high-speed measurement function circuit and power supply circuit. The high-precision measurement functional circuit realizes the hardware function of the multimeter. The high-speed measurement function circuit realizes the simulation of high-speed acquisition and output and the high-speed acquisition and output of digital quantity, and is used for realizing the hardware functions of seven instruments, namely an oscilloscope, a signal source, a frequency spectrograph, a logic analyzer, a code pattern generator, a multifunctional digital IO and an impedance analyzer. The power circuit realizes the hardware function of the program control power supply. The invention can be applied to the experiment teaching platform of electromechanical related courses of electronics, information, machinery, communication, instruments, electric power and the like of middle school and university. The invention has the following advantages:
1) The hardware circuit of three virtual instruments realizes nine instrument functions, the performance index meets the teaching requirement, the performance price ratio is very high, and the purchasing cost of schools can be obviously reduced;
2) The volume is small, the weight is light, the teaching equipment can be conveniently submerged, and the requirement on the space resources of the experimental station is reduced;
3) The teaching device is integrated with the teaching device into a whole, so that the synchronization of control and data is realized, and the teaching effect is obviously improved.
drawings
FIG. 1 is a structural block diagram of a comprehensive teaching experiment platform applied in the present invention;
FIG. 2 is a structural layout diagram of a comprehensive teaching experiment platform applied in the present invention;
FIG. 3 is a functional circuit schematic block diagram of the high accuracy measurement of the present invention;
FIG. 4 is a functional block diagram of the high speed measurement circuit of the present invention;
Fig. 5 is a schematic block diagram of the power supply circuit of the present invention.
The reference numbers are as follows:
1. A power supply module; 2. a multifunctional module; 3. a virtual instrument; 4. a main control module; 5. an expansion interface; 6. a housing; 7. an experimental bread board; 8. a control computer; 9. a course software management environment.
Detailed Description
the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the comprehensive teaching experiment platform applied to the virtual instrument 3 of the present invention is composed of a power module 1, a multifunctional module 2, the virtual instrument 3 of the present invention, an expansion interface 5, a main control module 4, a shell 6 and an experiment breadboard 7. The main control module 4 is respectively connected with the power module 1, the multifunctional module 2, the expansion interface 5 and the virtual instrument 3. The power module 1 provides power for the operation of the multifunctional module 2 and the virtual instrument 3 of the present invention. The multifunctional module 2 is mainly matched with an experiment circuit expanded on a host, and the circuit principle of the experiment is realized under the control of the main control module 4 through upper computer software. The virtual instrument 3 of the invention provides various source excitations and signal measurements required for an experimental circuit by being arranged on a virtual soft panel of an upper computer under the control of the main control module 4. The extension interface 5 realizes the extension connection between the teaching experiment platform host and the experiment circuit. The main control module 4 receives the instruction of the upper computer, and realizes the control and data interaction of the multifunctional circuit in the host and the virtual instrument 3. The housing 6 realizes the installation and protection of each module. The experimental breadboard 7 is inserted and pulled on the expansion interface 5, wherein the main control module 4 mainly realizes the USB data exchange function, realizes the data exchange between the 1-path USB communication and the 4-path USB communication, and is realized based on a common USB exchange controller, and the realization is realized by a TUSB 4041. The multifunctional module 2 adopts a 32-bit singlechip processor STM32F446 as a core, and is matched with a conventional analog quantity acquisition circuit, an analog quantity output circuit, a digital quantity input and output circuit and a timing counter circuit to realize the whole function. The multifunctional module is communicated with the main control module through a USB interface, and the USB interface circuit is also realized based on a USB interface of STM32F 446.
The software management environment 9 is loaded in the control computer 8, the experimental course software calls the host hardware drive of the invention through the course software management environment 9, and carries out data communication with the main control module 4 in the host through the USB bus, sends a control instruction and reads the collected data. The control computer 8 is a general windows operating system-based commercial computer. After receiving the instruction of the control computer 8, the main control module 4 converts the instruction into internal local bus data and realizes communication with the power supply module 1, the multifunctional module 2 and the virtual instrument 3. The functions of the modules can run simultaneously without influencing each other under the control of the main control module 4, data interaction with an upper computer is realized through a plurality of DMA channels, and all input and output signals of the modules are interacted with the experimental breadboard 7 through the expansion interfaces 5.
the virtual instrument 3 comprises a high-precision measurement function circuit, a high-speed measurement function circuit and a power supply circuit, wherein the high-precision measurement function circuit, the high-speed measurement function circuit and the power supply circuit are respectively connected with a main control module 4 in a comprehensive teaching experiment platform.
the virtual instrument 3 has nine common instrument functions of a universal meter, a dual-channel oscilloscope, a dual-channel signal source, a single-channel universal meter, a 16-channel logic analyzer, a 16-channel code pattern generator, a 16-channel multifunctional digital IO, a single-channel impedance analyzer, a dual-channel program control power supply and the like, the virtual instrument 3 needs to be used together with virtual instrument software installed in a control computer 8, the functions of analysis, display, storage and the like of the virtual instrument 3 are realized on the basis of software, and a friendly and powerful virtual panel is provided for a user. The test excitation signal of the virtual instrument 3 is interacted with the experimental breadboard 7 through the expansion interface 5 on one hand, and is directly led to the panel of the shell 6 on the other hand, so that the test excitation signal is convenient for a user to directly use.
Referring to fig. 3, the multimeter function can realize test functions such as direct current voltage, direct current, alternating current voltage, alternating current, resistance, conduction, diodes and the like, the multimeter function is realized based on a high-precision measurement function circuit, the input switching and protection circuit firstly realizes switching of measurement channels according to the test function selected by software, and meanwhile, in order to prevent damage of overload signals to a rear-end circuit, an overvoltage and overcurrent protection circuit is designed. The signals are switched to the input ends of the corresponding signal conditioning circuits, and the signal conditioning circuits filter and convert the signals, convert the signals into the input range of the high-precision analog-to-digital converter and collect the signals by the high-precision analog-to-digital converter. The high-precision analog-to-digital converter adopts a 24-bit high-precision analog-to-digital converter, and the integral precision of the system can be ensured to meet the requirement. The acquisition output of the high-precision analog-to-digital converter is processed by the embedded processor, and then the interaction of instructions and data is carried out between the local bus and the main control module 4.
Referring to fig. 4, the functions of the other virtual instruments are realized by a high-speed measurement function circuit, and the high-speed measurement function circuit can realize a dual-channel oscilloscope, a dual-channel signal source, a single-channel multimeter, a 16-channel logic analyzer, a 16-channel code pattern generator, a 16-channel multifunctional digital IO and a single-channel impedance analyzer. The oscilloscope adopts a double-path 14-bit high-speed analog-to-digital converter, the double-path 14-bit high-speed analog-to-digital converter is synchronously sampled and controlled by a programmable gate array (FPGA), and data output by the double-path 14-bit high-speed analog-to-digital converter enters an FIFO (first input first output) of the FPGA through an SPI (serial peripheral interface) bus for buffering and then is transmitted to an embedded processing unit II. The core of the signal source is that a double-path 14-bit high-speed digital-to-analog converter is adopted, data to be output is issued to an on-board memory by an embedded processing unit II, the FPGA controls the double-path 14-bit high-speed digital-to-analog converter to convert the data in the memory into analog signals in sequence, the analog signals are output after smooth filtering, and the phase control can be carried out between the two paths of output by the FPGA. The impedance analyzer is realized based on the matching of a dual-channel oscilloscope and a signal source, circuits of the two instruments are used on hardware, and the rest are realized by a software algorithm. The logic analyzer, the code pattern generator and the multifunctional digital IO are realized on the basis of an IO port of the FPGA on hardware, the difference of the logic analyzer, the code pattern generator and the multifunctional digital IO lies in that protocol waveforms and signal directions are different, the protocol waveforms are generated by software and downloaded to a Static Random Access Memory (SRAM), and input and output direction control is realized by a direction control circuit designed at the front end of the circuit.
Referring to fig. 5, the power circuit realizes a 0- +15V, -15V-0V two-way programmable power supply. The dual-path program control power supply is used as a part of functions of a virtual instrument and is realized by adopting a low dropout regulator (LDO) with wide input voltage as a core, a DC/DC in a circuit provides an input power supply for the LDO, the output voltage of the LDO is controlled by using a DA output analog signal, an output monitoring and control circuit can monitor the output voltage and current and feed back the output voltage and current to a control end, and an embedded processing circuit receives a control instruction from a local bus to realize output voltage, current detection and feedback control.
The invention provides a virtual instrument with multiple instrument functions, which can be embedded into a comprehensive teaching experiment platform for use, can obviously reduce the purchasing cost of schools, reduce the waste of space resources of experiment stations on the basis of meeting the requirements of teaching experiments on functions and performance, and realize the integration of instruments and teaching equipment and improve the teaching effect.
The above embodiments are only specific embodiments disclosed in the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention disclosed in the present invention should be subject to the scope of the claims.
Claims (5)
1. The utility model provides a virtual instrument in comprehensive teaching experiment platform which characterized in that: the virtual instrument comprises a high-precision measurement function circuit, a high-speed measurement function circuit and a power supply circuit, wherein the high-precision measurement function circuit, the high-speed measurement function circuit and the power supply circuit are respectively connected with the comprehensive teaching experiment platform.
2. The virtual instrument embedded in the comprehensive teaching experiment platform according to claim 1, wherein: the high-precision measurement function circuit comprises an input switching and protecting circuit, a signal conditioning circuit, a high-precision analog-to-digital converter and a first embedded processor, wherein the input switching and protecting circuit is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the high-precision analog-to-digital converter, and the high-precision analog-to-digital converter is connected to the first embedded processor.
3. The virtual instrument embedded in the comprehensive teaching experiment platform according to claim 2, wherein: the high-speed measurement function circuit comprises a second embedded processor, a two-way 14-bit high-speed analog-to-digital converter, a two-way 14-bit high-speed digital-to-analog converter, a programmable gate array, a direction control circuit and a static memory, wherein the programmable gate array is respectively connected with the second embedded processor, the two-way 14-bit high-speed analog-to-digital converter, the two-way 14-bit high-speed digital-to-analog converter, the direction control circuit and the static memory.
4. the virtual instrument embedded in the comprehensive teaching experiment platform according to claim 3, wherein: the high-speed measurement functional circuit further comprises an input protection circuit, an input signal conditioning power supply and an output signal conditioning power supply, wherein the input protection circuit is connected to the input signal conditioning power supply, the input signal conditioning power supply is connected to the 14-bit high-speed double-circuit analog-to-digital converter, and the 14-bit high-speed double-circuit digital-to-analog converter is connected to the output signal conditioning power supply.
5. The virtual instrument embedded in the comprehensive teaching experiment platform according to any one of claims 1 to 4, wherein: the power supply circuit comprises a third embedded processor, a DA (digital-to-analog) processor, a buck converter, a DC/DC (direct current/direct current) and an output monitoring and control circuit, wherein the third embedded processor is respectively connected with the DA and the DC/DC, and the third embedded processor is respectively connected with the DA and the DC/DC through the buck converter and the output monitoring and control circuit.
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Cited By (2)
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| CN111025131A (en) * | 2020-02-24 | 2020-04-17 | 浙江师范大学 | Characteristic parameter measuring instrument for triode amplifying circuit |
| CN113804937A (en) * | 2020-06-16 | 2021-12-17 | 普源精电科技股份有限公司 | Multifunctional measuring equipment, resource allocation method, measuring method, device and medium |
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