CN213659784U

CN213659784U - Signal waveform parameter measurement experiment teaching platform

Info

Publication number: CN213659784U
Application number: CN202022772450.6U
Authority: CN
Inventors: 赵二刚; 孙桂玲; 张维; 王艳芳
Original assignee: Nankai University
Current assignee: Nankai University
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-07-09
Anticipated expiration: 2030-11-26

Abstract

A signal waveform parameter measurement experiment teaching platform comprises a gain self-adaptive adjusting amplifier, an embedded processor and a Field Programmable Gate Array (FPGA), wherein the embedded processor and the FPGA are connected in a bidirectional mode through serial port communication; the gain self-adaptive adjusting amplifier is connected with the peak detection circuit, the voltage comparator, the analog switch and the ADC unit in a one-way mode through a data line; the FPGA is unidirectionally connected with the ADC unit through a data line; the embedded processor is respectively connected with the man-machine interaction interface and the external expansion input/output port in a bidirectional way through data lines; the embedded processor and the FPGA are respectively connected with a debugging and downloading program interface in a bidirectional way through a data line. The experiment teaching platform can measure frequency, peak-to-peak value, effective value and distortion degree, can be developed secondarily by debugging and downloading a program interface, can be used as a teaching platform for electronic information experiments, and is convenient to develop experiment teaching based on an embedded processor and an FPGA.

Description

Signal waveform parameter measurement experiment teaching platform

Technical Field

The utility model relates to an electronic information type experiment teaching instrument equipment technical field, concretely relates to signal waveform parameter measurement experiment teaching platform.

Background

In the teaching process of electronic information experiment courses, parameter measurement on various waveforms such as sine waves, square waves, triangular waves, sawtooth waves and the like is often involved, and the parameters include the frequency, peak-to-peak value, effective value, distortion degree and the like of the waveforms. At present, various instruments such as an oscilloscope, a universal meter, a distortion measuring instrument and the like are needed to complete the measurement of the parameters, and the cost is high and the portability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is solved the problem of the multiple parameter of simultaneous measurement wave form among the current electronic information class experiment course teaching process, provides a signal waveform parameter measurement experiment teaching platform, but simultaneous measurement frequency, peak-to-peak value, effective value and distortion degree, for the measurement scheme of many instruments of tradition, the integrated level is high and with low costs. And can carry out secondary development through debugging and download program interface, and then can regard as the teaching platform of electronic information class experiment, conveniently develop the experimental teaching based on embedded processor and FPGA.

The technical scheme of the utility model

A signal waveform parameter measurement experiment teaching platform comprises a gain self-adaptive adjusting amplifier, an embedded processor and a Field Programmable Gate Array (FPGA), wherein the embedded processor and the FPGA are connected in a bidirectional mode through serial port communication; the gain self-adaptive adjusting amplifier is connected with the peak detection circuit, the voltage comparator, the analog switch and the ADC unit in a one-way mode through a data line; the FPGA is unidirectionally connected with the ADC unit through a data line; the embedded processor is respectively connected with the man-machine interaction interface and the external expansion input/output port in a bidirectional way through data lines; the embedded processor and the FPGA are respectively connected with a debugging and downloading program interface in a bidirectional way through a data line. The whole experiment teaching platform is powered by the power supply part.

The utility model has the advantages and beneficial effect:

the signal waveform parameter measurement experiment teaching platform is an instrument used in the field of electronic information experiment teaching. The experiment teaching platform can measure frequency, peak-to-peak value, effective value and distortion degree simultaneously, and has the advantages of high integration level and low cost compared with the traditional measuring scheme of multiple instruments. And can carry out secondary development through debugging and download program interface, can regard as the teaching platform of electronic information class experiment, conveniently develop the experiment teaching based on embedded processor and FPGA.

Drawings

Fig. 1 is the schematic block diagram of the structure of the experimental teaching platform of the utility model.

Fig. 2 is a schematic diagram of the gain adaptive control amplifier circuit of the present invention.

In the figure 1, an embedded processor part, 2, a field programmable gate array part, 3, an ADC unit part, 4, a gain self-adaptive adjusting amplifier part, 5, an analog switch part, 6, a voltage comparator part, 7, a peak detection circuit part, 8, a man-machine interaction interface part, 9, an external expansion input/output port part, 10, a power supply part and 11, a debugging and downloading program interface part.

Detailed Description

Example 1:

as shown in fig. 1, the teaching platform for signal waveform parameter measurement experiment comprises a gain adaptive adjustment amplifier part 4, an embedded processor part 1 and a field programmable gate array part (FPGA)2 which are connected in a bidirectional manner through serial communication; the gain self-adaptive adjusting amplifier part 4 is connected with the peak value detection circuit part 7, the voltage comparator part 6, the analog switch part 5 and the ADC unit part 3 in a one-way mode through data lines; the FPGA is unidirectionally connected with the ADC unit part 3 through a data line; the embedded processor part 1 is respectively connected with a man-machine interaction interface part 8 and an external expansion input/output port part 9 in two directions through data lines; the embedded processor part 1 and the FPGA are respectively connected with a debugging and downloading program interface part 11 in a bidirectional way through data lines. The whole experiment teaching platform is powered by a power supply part 10.

Wherein, embedded processor portion 1 includes: ARM processor chip STM32F767IGT6 and peripheral circuit; the field programmable gate array section 2 includes: an FPGA chip EP4CE10E22C8N and a peripheral circuit; the ADC unit part 3 comprises an ADC chip AD9226 and a peripheral circuit; the gain adaptive adjustment amplifier section 4 includes: TL081 chip and peripheral circuits; the analog switch section 5 includes: CD4051 chip and peripheral circuit; the voltage comparator section 6 includes: an LM393 chip and peripheral circuits; the peak detection circuit section 7 includes: TL081 chip and peripheral circuits; the human-computer interaction interface section 8 includes: 1 liquid crystal screen (integrated resistance type touch screen), 2 LED lamps, 4 keys and 1 buzzer; the flaring input/output port portion 9 comprises: a common type input/output port, an analog input type input/output port and a PWM output type input/output port which are led out from the embedded processor STM32F767IGT 6; the power supply portion 10 includes: LM2596S-5.0, AMS1117-3.3, AMS1117-2.5 and AMS1117-1.2 chips, utilize the direct current input of 12 volts to produce the direct current voltage of 5 volts, 3.3 volts, 2.5 volts and 1.2 volts to supply power to the whole system; the debugging and downloading program interface section 11 includes: the debugging method comprises the steps of debugging and downloading a program interface in a JTAG (Joint test action group) and AS (application Server) mode of a field programmable gate array and debugging and downloading a program interface in an SWD (Single wire bus) mode of an embedded processor.

In fig. 1, an embedded processor section 1 and an external expansion input/output port section 9 are connected via 74I/O; the embedded processor part 1 is connected with the human-computer interaction interface part 8 through 46I/O; the embedded processor part 1 is connected with the field programmable gate array part 2 through 2I/O, and data communication between the embedded processor part and the field programmable gate array part is realized in a serial port mode; the embedded processor part 1 is connected with the debugging and downloading program interface part 11 through 2I/O to realize SWD mode downloading or debugging program; the field programmable gate array part 2 is connected with the ADC unit part 3 through 13I/O; the field programmable gate array part 2 is connected with the debugging and downloading program interface part 11 through 11I/O to realize the downloading or debugging of programs in JTAG and AS modes;

referring to fig. 2, the peak detection circuit section 7 and the voltage comparator section 6 are connected through 1 data line; the voltage comparator part 6 is connected with the analog switch part 5 through 1 data line; the analog switch part 5 is connected with the gain adaptive adjusting amplifier part 4 through 2 data lines; the power supply section 10 supplies power to the entire system. When the system is powered on, the peak value detection circuit part 7 detects the peak value of the detected signal, when the peak value exceeds 0.5 volt, the output signal Vsel of the voltage comparator part 6 is at high level, the analog switch part 5 connects R7 to the gain self-adaptive adjusting amplifier part 4, and the voltage gain is 2 times; when the peak value is lower than 0.5 v, the output signal Vsel of the voltage comparator section 6 is at a low level, and the analog switch section 5 switches R9 into the gain adaptive adjustment amplifier section 4, at which the voltage gain is 10 times; therefore, the function of gain self-adaptive adjustment is realized, a program solidified in the embedded processor and a circuit in the field programmable gate array start to execute after being electrified, the ADC is controlled to sample the output signal of the gain self-adaptive adjustment amplifier, and the function of simultaneously measuring the frequency, the peak-to-peak value, the effective value and the distortion factor of the measured signal can be realized. In addition, secondary development can be carried out on the experiment platform through debugging and downloading a program interface, and then the experiment platform can be used as a teaching platform for electronic information experiments, and experiment teaching based on an embedded processor and an FPGA is conveniently carried out.

Claims

1. The utility model provides a signal waveform parameter measurement experiment teaching platform which characterized in that: the device comprises a gain self-adaptive adjusting amplifier part, an embedded processor part and a field programmable gate array part, wherein the embedded processor part and the field programmable gate array part are connected in a bidirectional mode in a serial port communication mode; the gain self-adaptive adjusting amplifier part is connected with the peak detection circuit part, the voltage comparator part, the analog switch part and the ADC unit part in a one-way mode through data lines; the field programmable gate array part is connected with the ADC unit part in a one-way mode through a data line; the embedded processor part is respectively connected with the human-computer interaction interface part and the external expansion input/output port part in a bidirectional way through data lines; the embedded processor part and the field programmable gate array part are respectively connected with the debugging and downloading program interface part in a bidirectional way through data lines.

2. The signal waveform parameter measurement experiment teaching platform of claim 1, wherein: the experiment teaching platform is powered by a power supply part.

3. The signal waveform parameter measurement experiment teaching platform of claim 1, wherein: the gain self-adaptive adjusting amplifier part automatically changes the voltage gain of an output signal according to the peak value of a detected signal.