CN206363618U - A kind of lissajous figures apparatus for demonstrating based on CPLD - Google Patents
A kind of lissajous figures apparatus for demonstrating based on CPLD Download PDFInfo
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- CN206363618U CN206363618U CN201720005108.9U CN201720005108U CN206363618U CN 206363618 U CN206363618 U CN 206363618U CN 201720005108 U CN201720005108 U CN 201720005108U CN 206363618 U CN206363618 U CN 206363618U
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- cpld
- wave signal
- module
- circuit module
- lissajous figures
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Abstract
The utility model discloses a kind of lissajous figures apparatus for demonstrating based on CPLD, including the single chip control module being sequentially connected, DDS sinusoidal signals generation module, conversion circuit module and CPLD modules, the keyboard and display screen being connected with single chip control module, and the first filter circuit module and the second filter circuit module being connected with CPLD modules；Single chip control module and CPLD module two-way communications；Single chip control module is used to be communicated with keyboard and display screen, and controls DDS sinusoidal signals generation module to produce sine wave signal, and frequency dividing and the phase shift realized to signal that with CPLD modules communicate；Conversion circuit module is used to sine wave signal being converted to square-wave signal.Not only simple to operate, precision is high, the lissajous figures of exportable more standard, and can realize stepping frequency modulation phase modulation, can more intuitively observe change of the lissajous figures under various parameters.
Description
Technical field
The utility model is related to a kind of graph demonstration device, more particularly to a kind of lissajous figures demonstration based on CPLD
Device, belongs to laboratory apparatus technical field.
Background technology
Defined in physics, when a particle simultaneously participates in the simple harmonic oscillation of two mutually perpendicular directions, the displacement of particle
It is the vector of the displacement of the two vibrations, if the frequency of two vibrations has the relation of simple integer ratios, particle
Track be stable closing resultant motion track, these orbital curves are lissajous figures.
Lissajous figures are provided by the relation between research object vibration and its frequency and phase of the image of its characteristic
Good means, thus there is important value in terms of measurement, so being widely used in physics teaching experiment, sensor dynamic
The field such as Characteristics Detection and frequency measurement.
Prior art typically produces Lee's Sa such as waveform using signal generator and oscillograph；Specifically, in electronic system,
Two paths of signals is produced by two independent signal sources, the X-axis and Y-axis of oscillograph is separately input into, Lie groupoid can be observed
Shape.But Lee's Sa such as waveform is produced by such a mode, required equipment is more, complex operation, and can not arbitrarily change parameter
So as to reach the purpose for changing figure.
Patent document CN202513888U discloses a kind of high stable lissajous figures bashertron, and it is particular by frequency conversion
Circuit module and phase modulation circuit module enter line translation to signal, but the signal accuracy of its output can not be ensured, so as to cause
The lissajous figures shown in oscillograph are nonstandard, and instrument can not realize stepping frequency modulation phase modulation.
Utility model content
Main purpose of the present utility model is, overcomes deficiency of the prior art to be based on CPLD there is provided one kind
The lissajous figures apparatus for demonstrating of (Complex Programmable Logic Device CPLDs), no
Only simple to operate, precision is high, the lissajous figures of output more standard, and can realize stepping frequency modulation phase modulation, can be more straight
See change of the ground observation lissajous figures under various parameters.
In order to achieve the above object, the technical scheme that the utility model is used is：
A kind of lissajous figures apparatus for demonstrating based on CPLD, including the single chip control module that is sequentially connected, DDS are sinusoidal
Signal generator module, conversion circuit module and CPLD modules, the keyboard and display screen being connected with single chip control module, Yi Jiyu
CPLD modules connected the first filter circuit module and the second filter circuit module；The single chip control module and CPLD modules
Two-way communication；
The keyboard, the button operation for carrying out parameter initialization and parameter setting；
The display screen, the parameter for showing initialization that key presses are completed and setting；
The single chip control module, for being communicated with keyboard and display screen, and controls DDS sinusoidal signals to produce mould
Block produces sine wave signal, and frequency dividing and the phase shift realized to signal that with CPLD modules communicate；
The DDS sinusoidal signals generation module, for producing the sine wave signal of setpoint frequency to conversion circuit module；
The conversion circuit module, CPLD modules are given for being converted to export sine wave signal after square-wave signal；
The CPLD modules, for being divided to square-wave signal and phase shift, so as to produce divided output signal and phase shift
Output signal；
First filter circuit module, sinusoidal signal export to showing for being filtered to divided output signal after processing
Ripple device；
Second filter circuit module, sinusoidal signal export to showing for being filtered to phase shift output signal after processing
Ripple device.
The utility model is further arranged to：The single chip control module uses MSP430F149 chips.
The utility model is further arranged to：The CPLD modules, two divided-frequency is carried out for the square-wave signal to 900kHz
Or four frequency dividings, 900kHz square-wave signal is converted into 450kHz square-wave signal by two divided-frequency, 900kHz square wave is believed
Number it is converted into 300kHz square-wave signal by four frequency dividings.
The utility model is further arranged to：The keyboard is matrix keyboard.
The utility model is further arranged to：The keyboard includes the button for some parameter settings, and some parameters are set
Surely divide ratio setting, the setting of phase shift coefficient, step angle setting and automatic cycle stepping setting are included.
The utility model is further arranged to：The display screen is TFT display screens.
Compared with prior art, the utility model has an advantageous effect in that：
The lissajous figures apparatus for demonstrating that the utility model is provided, without signal input, mould is produced by DDS sinusoidal signals
Block produces the sine wave signal of high-precision setpoint frequency, and sine wave signal is converted into square wave letter by conversion circuit module
Number, then process CPLD modules are divided, phase shift, export high-precision sinusoidal signal, simple to operate, precision is high, in oscillograph
On can obtain that output is stable, the lissajous figures of standard；It can realize that automatic cycle is walked by the button operation of keyboard simultaneously
Enter phase shift, be able to observe that the lissajous figures of consecutive variations, and can more intuitively observe lissajous figures various
Change under parameter.
The above is only the general introduction of technical solutions of the utility model, in order to be better understood upon technology of the present utility model
Means, the utility model will be further described below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of the lissajous figures apparatus for demonstrating based on CPLD of the utility model；
Fig. 2 is CPLD modules progress two divided-frequency in a kind of lissajous figures apparatus for demonstrating based on CPLD of the utility model
Waveform diagram；
Fig. 3 is the frequency dividing of CPLD modules progress four in a kind of lissajous figures apparatus for demonstrating based on CPLD of the utility model
Waveform diagram；
Fig. 4 is Lee that a kind of lissajous figures apparatus for demonstrating emulation canonical parameter based on CPLD of the utility model is worth to
Sa such as figure.
Embodiment
With reference to Figure of description, the utility model is further described.
A kind of lissajous figures apparatus for demonstrating based on CPLD as shown in Figure 1, including the single-chip microcomputer control being sequentially connected
Module, DDS sinusoidal signals generation module, conversion circuit module and CPLD modules, the keyboard being connected with single chip control module and
Display screen, and the first filter circuit module and the second filter circuit module being connected with CPLD modules；The single-chip microcomputer control
Module and CPLD module two-way communications；Wherein, single chip control module use MSP430F149 chips, with abundant I/O mouths,
Register, timer, are easy to be combined with CPLD modules to realize accurate control.
The keyboard, the button operation for carrying out parameter initialization and parameter setting；Preferably matrix keyboard, volume
It is small, coordinate the MSP430 single-chip microcomputers responded with quick-speed interruption, quick, sensitive button operation can be realized.Keyboard includes using
In the button of some parameter settings, some parameter settings include divide ratio setting, the setting of phase shift coefficient, step angle setting and
Automatic cycle stepping setting etc..
The display screen, the parameter for showing initialization that key presses are completed and setting；Preferably TFT shows
Display screen, has the advantages that display is fine and smooth, display content is more, screen is beautiful, relevant parameter is effectively shown, relevant parameter includes letter
Number frequency, divide ratio, phase shift coefficient, step angle etc..
The single chip control module, for being communicated with keyboard and display screen, and controls DDS sinusoidal signals to produce mould
Block produces sine wave signal, and frequency dividing and the phase shift realized to signal that with CPLD modules communicate.
The DDS sinusoidal signals generation module, for producing the sine wave signal of setpoint frequency to conversion circuit module.
The conversion circuit module, CPLD modules are given for being converted to export sine wave signal after square-wave signal.
The CPLD modules, for being divided to square-wave signal and phase shift, so as to produce divided output signal and phase shift
Output signal；CPLD resume module speed is fast, it is possible to achieve the up to frequency dividing of 900kHz square-wave signal and phase shift.CPLD modules
Often sample after a rising edge and trailing edge, carry out counting operation, then enter line level upset；By changing count value, just
Program control phase shift function can be completed.Wherein 900kHz phase shift minimum step angle is 6.4 °, 450kHz phase shift minimum step angle
For 3.2 °, 300kHz phase shift minimum step angle is 2.1 °.
The frequency dividing of the CPLD modules has two divided-frequency or four frequency dividings.Two divided-frequency as shown in Figure 2, is that CPLD modules are often detected
To a trailing edge, with regard to carrying out trigging signal operation, so that 900kHz square-wave signal is converted into 450kHz by two divided-frequency
Square-wave signal.Four frequency dividings as shown in Figure 3, are that CPLD modules are sampled simultaneously to the rising edge of input signal with trailing edge, will
Sampled data is stored in holder, often counts three numbers and just enters line level upset, so that 900kHz square-wave signal is passed through into four frequency dividings
It is converted into 300kHz square-wave signal.
First filter circuit module, for exporting sinusoidal signal after being filtered processing to divided output signal（Fig. 1
Shown in be output signal 1）To oscillograph.
Second filter circuit module, for exporting sinusoidal signal after being filtered processing to phase shift output signal（Fig. 1
Shown in be output signal 2）To oscillograph.
Two filter circuit modules are filtered processing to the output signal of CPLD modules, and the high order for removing square-wave signal is humorous
Ripple, leaves behind fundamental signal, has restored former sinusoidal signal.Output sinusoidal signal is inputted to the X-axis of oscillograph and Y-axis,
Lissajous figures under the Exemplary parameter values that can be shown, as shown in Figure 4.
Innovative point of the present utility model is, based on single chip control module, is produced by DDS sinusoidal signals generation module
High-precision sine wave waveform, and high accuracy frequency dividing and phase shift are realized by CPLD modules, so as to can be obtained on oscillograph defeated
Go out the stable, lissajous figures of standard；Automatic cycle stepping phase shift, Neng Gouguan can be realized by the button operation of keyboard simultaneously
The lissajous figures of consecutive variations are observed, and can more intuitively observe change of the lissajous figures under various parameters.
It is described above, only it is preferred embodiment of the present utility model, not makees any formal to the utility model
Limitation, although the utility model is disclosed above with preferred embodiment, but is not limited to the utility model, any ripe
Professional and technical personnel is known, is not being departed from the range of technical solutions of the utility model, when in the technology using the disclosure above
Hold the equivalent embodiment made a little change or be modified to equivalent variations, as long as without departing from technical solutions of the utility model
Hold, any simple modification, equivalent variations and the modification made according to technical spirit of the present utility model to above example,
In the range of still falling within technical solutions of the utility model.
Claims (6)
1. a kind of lissajous figures apparatus for demonstrating based on CPLD, it is characterised in that：Single-chip microcomputer including being sequentially connected controls mould
Block, DDS sinusoidal signals generation module, conversion circuit module and CPLD modules, the keyboard being connected with single chip control module and aobvious
Display screen, and the first filter circuit module and the second filter circuit module being connected with CPLD modules；The single-chip microcomputer controls mould
Block and CPLD module two-way communications；
The keyboard, the button operation for carrying out parameter initialization and parameter setting；
The display screen, the parameter for showing initialization that key presses are completed and setting；
The single chip control module, for being communicated with keyboard and display screen, and controls DDS sinusoidal signals generation module to produce
Raw sine wave signal, and frequency dividing and the phase shift realized to signal that with CPLD modules communicate；
The DDS sinusoidal signals generation module, for producing the sine wave signal of setpoint frequency to conversion circuit module；
The conversion circuit module, CPLD modules are given for being converted to export sine wave signal after square-wave signal；
The CPLD modules, for being divided to square-wave signal and phase shift, so as to produce divided output signal and phase shift output
Signal；
First filter circuit module, for exporting sinusoidal signal to oscillography after being filtered processing to divided output signal
Device；
Second filter circuit module, for exporting sinusoidal signal to oscillography after being filtered processing to phase shift output signal
Device.
2. a kind of lissajous figures apparatus for demonstrating based on CPLD according to claim 1, it is characterised in that：The monolithic
Machine control module uses MSP430F149 chips.
3. a kind of lissajous figures apparatus for demonstrating based on CPLD according to claim 1, it is characterised in that：The CPLD
Module, carries out two divided-frequency or four frequency dividings for the square-wave signal to 900kHz, 900kHz square-wave signal is turned by two divided-frequency
Change 450kHz square-wave signal into, 900kHz square-wave signal is converted into 300kHz square-wave signal by four frequency dividings.
4. a kind of lissajous figures apparatus for demonstrating based on CPLD according to claim 1, it is characterised in that：The keyboard
For matrix keyboard.
5. a kind of lissajous figures apparatus for demonstrating based on CPLD according to claim 1, it is characterised in that：The keyboard
Including the button for some parameter settings, some parameter settings include divide ratio setting, the setting of phase shift coefficient, step angle
Setting and automatic cycle stepping setting.
6. a kind of lissajous figures apparatus for demonstrating based on CPLD according to claim 1, it is characterised in that：The display
Shield for TFT display screens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720005108.9U CN206363618U (en) | 2017-01-03 | 2017-01-03 | A kind of lissajous figures apparatus for demonstrating based on CPLD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720005108.9U CN206363618U (en) | 2017-01-03 | 2017-01-03 | A kind of lissajous figures apparatus for demonstrating based on CPLD |
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| Publication Number | Publication Date |
|---|---|
| CN206363618U true CN206363618U (en) | 2017-07-28 |
Family
ID=59379223
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720005108.9U Expired - Fee Related CN206363618U (en) | 2017-01-03 | 2017-01-03 | A kind of lissajous figures apparatus for demonstrating based on CPLD |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877431A (en) * | 2018-05-28 | 2018-11-23 | 江苏理工学院 | A kind of dual frequency of adjustable phase signal experimental provision based on IoT technology |
| CN108988823A (en) * | 2018-07-23 | 2018-12-11 | 安徽蓝麦通信股份有限公司 | A kind of new digital phase shifters |
| CN110060551A (en) * | 2019-02-26 | 2019-07-26 | 江苏理工学院 | A kind of Lee's Sa such as signal demo system |
| CN110060555A (en) * | 2019-02-26 | 2019-07-26 | 江苏理工学院 | A kind of electric signal synthesis tester |
| CN110531103A (en) * | 2019-09-30 | 2019-12-03 | 浙江海洋大学 | A kind of light velocity measurement method and apparatus based on Lissajou's figure |
| CN111494001A (en) * | 2020-05-12 | 2020-08-07 | 北京天星博迈迪医疗器械有限公司 | Medical equipment control circuit for generating plasma and plasma medical equipment |
| CN112436748A (en) * | 2020-11-17 | 2021-03-02 | 天津津航计算技术研究所 | Digital sine wave circuit based on CPLD |
-
2017
- 2017-01-03 CN CN201720005108.9U patent/CN206363618U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877431A (en) * | 2018-05-28 | 2018-11-23 | 江苏理工学院 | A kind of dual frequency of adjustable phase signal experimental provision based on IoT technology |
| CN108988823A (en) * | 2018-07-23 | 2018-12-11 | 安徽蓝麦通信股份有限公司 | A kind of new digital phase shifters |
| CN110060551A (en) * | 2019-02-26 | 2019-07-26 | 江苏理工学院 | A kind of Lee's Sa such as signal demo system |
| CN110060555A (en) * | 2019-02-26 | 2019-07-26 | 江苏理工学院 | A kind of electric signal synthesis tester |
| CN110531103A (en) * | 2019-09-30 | 2019-12-03 | 浙江海洋大学 | A kind of light velocity measurement method and apparatus based on Lissajou's figure |
| CN111494001A (en) * | 2020-05-12 | 2020-08-07 | 北京天星博迈迪医疗器械有限公司 | Medical equipment control circuit for generating plasma and plasma medical equipment |
| CN112436748A (en) * | 2020-11-17 | 2021-03-02 | 天津津航计算技术研究所 | Digital sine wave circuit based on CPLD |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170728 Termination date: 20190103 |