CN110610639A - Course extensible comprehensive teaching experiment platform - Google Patents
Course extensible comprehensive teaching experiment platform Download PDFInfo
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- CN110610639A CN110610639A CN201910997068.4A CN201910997068A CN110610639A CN 110610639 A CN110610639 A CN 110610639A CN 201910997068 A CN201910997068 A CN 201910997068A CN 110610639 A CN110610639 A CN 110610639A
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Abstract
The invention relates to a course extensible comprehensive teaching experiment platform which comprises a control computer and a teaching experiment platform host, wherein the teaching experiment platform host comprises a power supply module, a multifunctional module, a virtual instrument and a main control module, the main control module is respectively connected with the power supply module, the multifunctional module and the virtual instrument, and the control computer is connected with the main control module. The invention can obviously improve the universality and expansibility of the teaching experiment platform.
Description
Technical Field
The invention relates to the field of teaching, in particular to a comprehensive teaching experiment platform with extensible courses.
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 experiment equipment in the market mainly comprises various special small-sized experimental boxes or large-sized experimental tables, and although manual experiment means and methods are provided for most courses, the problems are more, and the summary is as follows:
1) the universalization degree is poor, the teaching difficulty is increased, and the learning energy is dispersed. The technical systems and implementation modes of different manufacturers have larger difference for the same course, and the technical systems and implementation modes of the same manufacturer are completely different for different courses. As a result, teachers and students may spend more unnecessary energy to become familiar with the teaching equipment, and cannot be put into the experimental course;
2) the expansibility is poor, the purchasing cost is increased, and the management difficulty is increased. The basic principles and functions of core components of a plurality of experimental devices are consistent, but the core components cannot be extracted and shared, when experimental contents need to be increased, the expansion implementation cannot be carried out on the original equipment, and brand new equipment has to be purchased again, so that a large amount of repeated purchasing is caused, on one hand, the purchasing and maintenance cost is unnecessarily increased, and on the other hand, a large amount of special equipment which is continuously increased in a laboratory brings difficulty to the management of the laboratory;
3) the implementation is old and disjointed from the technical development. The technology adopted by a plurality of experimental devices is too old and low-end, and cannot be well combined with the current industrial information technology development trend. On one hand, the 'antique' teaching equipment causes students to lose the interest of learning and research, and limits the exertion of experimental teaching function; on the other hand, students cannot be enabled to synchronously contact the latest industrial information technology when learning book knowledge.
Disclosure of Invention
The invention provides a comprehensive teaching experiment platform with extensible courses for solving the technical problems in the background technology, and the universality and the expansibility of the teaching experiment platform are obviously improved.
The technical solution of the invention is as follows: the invention relates to a course extensible comprehensive teaching experiment platform, which is characterized in that: the comprehensive teaching experiment platform comprises a control computer and a teaching experiment platform host, wherein the teaching experiment platform host comprises a power supply module, a multifunctional module, a virtual instrument and a main control module, the main control module is respectively connected with the power supply module, the multifunctional module and the virtual instrument, and the control computer is connected with the main control module.
Preferably, the teaching experiment platform host further comprises an expansion interface, and the expansion interface is respectively connected with the power supply module, the multifunctional module and the virtual instrument.
Preferably, the teaching experiment platform host further comprises an experiment breadboard, and the experiment breadboard is plugged in and pulled out of the expansion interface.
Preferably, the expansion interface adopts a PCI high-density interface, a PCI golden finger is directly processed on the course function board experiment breadboard of various expansions, and a PCI slot is installed on the teaching experiment platform host.
Preferably, the virtual instrument comprises 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 and a dual-channel programmable power supply.
Preferably, the main control module is implemented by using a TUSB 4041.
Preferably, the multifunctional module adopts a 32-bit singlechip processor STM32F446 as a core, and is matched with an 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.
Preferably, the teaching experiment platform host computer still includes the casing, and the installation and the protection of each module of teaching experiment platform host computer are realized to the casing.
Preferably, a course software management environment is loaded in the control computer.
The teaching experiment platform host is the core of the invention, in order to use the teaching experiment platform to have certain universality and expansibility, through research and analysis of dozens of professional courses such as electronics, information, machinery, communication, instruments, electric power and the like in colleges and universities, hardware resources of experiment equipment are divided into universal resources, expansion interfaces and special resources, the universal resources are resources which are never used by most experiments and are subjected to standardized processing, the expansion interfaces are interfaces for realizing connection of the universal resources and the special resources, and the special resources are only resources required by a specific experiment course. The universal resource is used as a core resource forming a teaching experiment platform host and consists of a power supply module, a multifunctional module, a virtual instrument and a main control module; the extension interface is used as the key for realizing expandability, the PCI high-density interface is creatively adopted for realizing the expandability, the PCI golden finger is directly processed on various extended experimental breadboards, the PCI slot is arranged on a host shell of a teaching experiment platform and is exposed, the insertion and extraction exchange of the course function board is convenient, and the extension interface can be applied to the experimental teaching of electromechanical related courses of electronics, information, machinery, communication, instruments, electric power and the like of middle school and university. The special resources are various circuits and mechanical devices for realizing experimental principles and are used as the extended configuration of the host. The invention extracts and standardizes most of resources required by the experiment to form a platform with strong universality, and is connected with special experiment resources through a high-density expansion interface to develop various experiments under the cooperation of upper computer software. It has the following advantages:
1) the universality and the expansibility are strong, and a series of problems caused by the current special teaching equipment, such as the learning difficulty problem, the purchasing problem, the management problem and the like, are solved;
2) an integral scheme is constructed based on the idea of software, namely an instrument, reasonable software and hardware function segmentation is carried out, the current industrial technology development trend is met, and students can understand the latest industrial information technology in a contact manner in the experiment process.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a structural layout diagram of the present invention;
FIG. 3 is a schematic block diagram of the high precision measurement function circuit of the virtual instrument of the present invention;
FIG. 4 is a high speed measurement function block diagram of the virtual instrument of the present invention;
FIG. 5 is a schematic block diagram of the power supply circuitry of the virtual instrument 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, the structure of the embodiment of the present invention includes three parts, namely a control computer 8, a teaching experiment platform host and a course software management environment 9. The control computer 8 is used for installing a course software management environment 9 and various course software and realizing the control of the teaching experiment platform host through a USB interface according to the experiment process. The course software management environment has two functions, namely hardware resource identification and management of the experiment platform host computer, loading specific experiment course software, and controlling the teaching experiment platform host computer to carry out various experiments through the experiment course software. The control computer can be a common commercial computer based on a windows operating system, a desktop computer can be adopted in the application of a laboratory, and a notebook computer or a tablet computer can be adopted in the application of a classroom or a mobile place. The advantage of using a common commercial computer is that the cost can be further reduced and the utilization rate of common equipment in schools can be improved.
The teaching experiment platform host is a hardware core of the invention and comprises a power supply module 1, a multifunctional module 2, a virtual instrument 3, a main control module 4, an expansion interface 5, a shell 6, an experiment bread board 7 and the like. The main control module 4 is respectively connected with the power module 1, the multifunctional module 2 and the virtual instrument 3, and the expansion interface 5 is respectively connected with the power module 1, the multifunctional module 2 and the virtual instrument 3. The shell 6 realizes the installation and the protection of each module of the teaching experiment platform host. The experimental breadboard 7 is plugged in the expansion interface 5, the experimental breadboard 7 is changed into a hardware circuit board of other courses, and the host is changed into corresponding experimental equipment. If the experimental breadboard 7 is replaced by an analog circuit experimental board, an analog circuit experiment can be carried out, and if the experimental breadboard is replaced by a digital circuit experimental board, a digital circuit experiment can be carried out.
The power module 1 provides +5V fixed power supply for various circuits in the host computer on one hand, and provides three fixed power supplies of +5V, +12V and-12V and two program-controlled power supplies of 0- +15V and-15V-0V for the plugged experimental bread board 7 through the expansion interface 5 on the other hand.
The multifunctional module 2 is the core hardware of the teaching experiment platform host, and is formed by extracting and summarizing common resources required by various experiment courses. The multifunctional module 2 can realize the acquisition of 16 paths of analog quantity, 4 paths of analog quantity output, digital IO (input/output) which can be set in 24 paths of directions and 6 paths of timing counters, the functions can run simultaneously and do not influence each other under the control of the controller of the multifunctional module 2, data interaction between the multifunctional module 2 and an upper computer is realized through a plurality of DMA (direct memory access) channels, and all input/output signals of the multifunctional module 2 are interacted with an experimental bread board 7 through an expansion interface 5. 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 virtual instrument 3 can realize a double-channel oscilloscope, a double-channel signal source, a single-channel multimeter, a 16-channel logic analyzer, a double-channel program control power supply and a single-channel impedance analyzer, the virtual instrument 3 needs to be used together with virtual instrument software installed in a control computer, functions of analysis, display, storage and the like of the virtual instrument 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.
The main control module 4 is used for realizing control over the power module 1, the multifunctional module 2 and the virtual instrument 3 and realizing USB communication connection with the control computer 8. The main control module 4 mainly implements a USB data exchange function, implements data exchange between the 1-way USB communication and the 4-way USB communication, and is implemented based on a commonly used USB exchange controller, which is implemented by using a TUSB 4041.
The expansion interface 5 is the key for realizing the course expansion, and the switching signals relate to power signals, analog signals and digital signals, and the number of the signals is large. If a common signal connector is adopted, a single connector cannot be realized, so that the number of the expansion connectors is increased, and the difficulty of the design of the switching interface is increased; if an aviation connector or an European card connector with higher density is adopted, the plugging and unplugging are inconvenient, or the overall shape design is not changed. In order to solve the problems, through continuous experimental verification, a PCI interface used for carrying out high-speed data local bus interconnection in a computer is creatively applied to the PCI interface, and through reasonable distribution and layout wiring of signals, the EMC crosstalk problem of mixed signals is solved, the course experiment board is reliable in connection and convenient to plug and unplug, and the system structure and the modeling design are simplified.
Experiment bread board 7 (or course experiment board) designs for a circuit board that has the golden finger, when needing to do the experiment of which class, installs corresponding experiment board on the experiment platform host computer to under the prerequisite that need not change the platform host computer, can constantly increase and expand new experiment course, simplified experimental facilities management when reducing school's purchasing cost. Various experimental circuits are designed on the experimental bread board 7, students complete wiring on the experimental bread board 7 according to prompts in course software, and excitation generation, signal acquisition and analysis are realized through operation of the course software, so that the learning purposes of theoretical knowledge actual verification and innovation idea verification are achieved. Aiming at different experimental courses, the use and the operation of the host are not changed, the circuit connection and the software operation which are closely related to the courses are changed, the energy of students can be completely concentrated on the courses, and the learning efficiency is improved.
The virtual instrument 3 comprises a high-precision measurement function circuit, a high-speed measurement function circuit and a power supply circuit, and the high-precision measurement function circuit, the high-speed measurement function circuit and the power supply circuit are respectively connected with the main control module 4 in the 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 the 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, the signal conditioning circuits filter and convert the signals, the signals are converted into the input range of a high-precision analog-to-digital converter (high-precision AD), and the signals are collected by the high-precision AD. The high-precision analog-to-digital converter (high-precision AD) adopts a 24-bit high-precision analog-to-digital converter, and the integral precision of the system can be ensured to meet the requirement. After the acquisition output of the high-precision analog-to-digital converter (high-precision AD) is processed by the embedded processor I, 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 is characterized in that a double-path 14-bit high-speed analog-to-digital converter (high-speed AD) is adopted, the double-path 14-bit high-speed AD is synchronously sampled and controlled by a programmable gate array (FPGA), and data output by the double-path 14-bit high-speed AD enters an FIFO (first in first out) 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 (high-speed DA) is adopted, data to be output is issued to an on-board memory by an embedded processor II, the FPGA controls the double-path 14-bit high-speed digital-to-analog converter (high-speed DA) 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 comprehensive teaching experiment platform with extensible courses, which can be used for teaching demonstration and manual experiments of different courses by expanding software and hardware of different experiment courses based on a teaching experiment platform, and can obviously improve the universality and the expansibility of the teaching experiment platform. The invention adopts the idea of software, namely instruments, and accords with the current industrial information technology development trend.
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 (9)
1. The utility model provides a course extensible synthesizes teaching experiment platform which characterized in that: the comprehensive teaching experiment platform comprises a control computer and a teaching experiment platform host, wherein the teaching experiment platform host comprises a power supply module, a multifunctional module, a virtual instrument and a main control module, the main control module is respectively connected with the power supply module, the multifunctional module and the virtual instrument, and the control computer is connected with the main control module.
2. The course extensible integrated teaching experiment platform of claim 1, wherein: the teaching experiment platform host computer still includes the extension interface, the extension interface is connected with power module, multifunctional module and virtual instrument respectively.
3. The course extensible integrated teaching experiment platform of claim 2, wherein: the teaching experiment platform host computer still includes the experiment bread board, experiment bread board plug is on expansion interface.
4. The course extensible integrated teaching experiment platform of claim 3, wherein: the extension interface adopts the high-density interface of PCI, and PCI golden finger directly processes to on the course function board experiment bread board of various extensions, and the PCI slot is installed on teaching experiment platform host computer.
5. The course extensible integrated teaching experiment platform according to claim 1, 2, 3 or 4, wherein: the virtual instrument comprises 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 and a dual-channel programmable power supply.
6. The course extensible integrated teaching experiment platform of claim 5, wherein: the main control module is realized by a TUSB 4041.
7. The course extensible integrated teaching experiment platform of claim 6, wherein: the multifunctional module adopts a 32-bit singlechip processor STM32F446 as a core, and is matched with an 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.
8. The course extensible integrated teaching experiment platform of claim 7, wherein: the teaching experiment platform host computer still includes the casing, the installation and the protection of each module of teaching experiment platform host computer are realized to the casing.
9. The course extensible integrated teaching experiment platform of claim 8, wherein: a course software management environment is loaded in the control computer.
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