CN208076972U

CN208076972U - A kind of SCM Based step signal generator

Info

Publication number: CN208076972U
Application number: CN201820502670.7U
Authority: CN
Inventors: 陈伟; 孙杏
Original assignee: Xian University of Science and Technology
Current assignee: Xian University of Science and Technology
Priority date: 2018-04-10
Filing date: 2018-04-10
Publication date: 2018-11-09
Anticipated expiration: 2028-04-10

Abstract

The utility model belongs to signal generator technical field, more particularly to a kind of novel SCM Based step signal generator.Including peripheral control circuits, STC89C52 single chip, DAC0832 digital analog converters, OP07 operation amplifiers chip and 1602 liquid crystal displays；Using STC89C52 single chip as Master control chip, using DAC0832 analog-digital chips and amplifier OP07 composition D/A conversion circuits and I/V conversion circuits, input control is carried out using 4*4 matrix keyboards, the real-time display of parameters is realized eventually by 1602 liquid crystal displays.To keep the structure of the SCM Based step signal generator simpler, volume smaller, manufacturing cost is lower, preferably eliminates higher hamonic wave, and the simpler function of realizing frequency modulation, adjust exponent number and harmonic.

Description

A kind of SCM Based step signal generator

Technical field

The utility model belongs to signal generator technical field, more particularly to a kind of novel SCM Based staircase waveform Signal generator.

Background technology

Currently, staircase waveform signals, the application of raw device is very extensive, it is as one of widest all purpose instrument quilt Used in contemporary electronic electrical measuring field.Institutes Of Technology Of Nanjing's electronic engineering in 2005 and the large power of photoelectric technology institute are more delivered " analysis of staircase generator based on PSpice and design " text in, system and each functional circuit are emulated, though Right simple operations can carry out tele-experimentation, but cannot carry out real-time sampling and display；Hunan modern logistics vocational technology in 2006 In " circuit design of the staircase generator based on EWB " text that the Xu Shuying of institute is delivered, emulates and nine grades of constant amplitudes can be achieved Staircase waveform, but output voltage is affected by system components circuit；Peng Luoli, Peng Rui of nineteen ninety-five Guangdong University of Technology In " microcontroller the controls step signal generator " text delivered, staircase waveform series can set to 0~12 grades in advance, but be adopted in this article External extension EPROM is needed to form single-chip minimum system with intel8031 microcontrollers.

The raw device higher hamonic wave of staircase waveform signalling in the prior art is difficult to eliminate, and needs that hardware exchange ability is added Realize the adjusting of frequency, and manufacturing cost is higher.

Utility model content

The utility model provides a kind of novel SCM Based step signal generator.

Specific technical solution is the SCM Based step signal generator, including peripheral control circuits, STC89C52 single chip, DAC0832 digital analog converters, OP07 operation amplifiers chip and 1602 liquid crystal displays；It is contained outside described Circuit processed connects STC89C52 single chip, and STC89C52 single chip is sequentially connected DAC0832 digital analog converters, OP07 operations are put Large chip passes through the design parameter of 1602 liquid crystal display real-time display waveforms.It is used as main control by STC89C52 single chip Chip.Transformation of the digital signal to analog signal is realized by DAC0832 analog-digital chips, then is put by the filtering of OP07 amplifiers Big output.

The peripheral control circuits matrix keyboard, directly connect with STC89C52 single chip.

DAC0832 uses direct mode operation, the data port of DAC0832 directly with the P0 of STC89C52 microcontrollers mouth phases Even；2 pin of inverting input of the level-one operational amplifier of OP07 operation amplifier chips and the current output terminal I of DAC0832_OUT1 Be connected, 3 pin of normal phase input end ground connection and with the I of DAC0832_OUT2It is connected；6 pin of level-one amplifier output end is put with two level operation 2 pin of reverse input end of big device is connected, the positive input end grounding of two level amplifier, the 6 pin conduct of output end of two level amplifier Waveform output end can see ideal output waveform with oscillograph observation.

Liquid crystal display is 1602, and described 1602 data port is connected with the P1 of microcontroller mouths, the ports RS and microcontroller The connected ports R/W P2.5 are connected with the port P2.6, E of microcontroller with the P2.7 of microcontroller.

Advantageous effect, structure is simpler, and volume smaller, manufacturing cost is lower, preferably eliminates higher hamonic wave, and The simpler function of realizing frequency modulation, adjust exponent number and harmonic.

Description of the drawings

In order to illustrate more clearly of the technical solution of the utility model, attached drawing needed for embodiment description will be made below It is simple to introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, common to this field For technical staff, without creative efforts, other attached drawings are can also be obtained according to these attached drawings, these The technical solution that attached drawing is directly obtained should also belong to the protection scope of the utility model.

Fig. 1 is the structure diagram of the utility model.

Fig. 2 is the pinouts of STC89C52 single chip described in the utility model.

Fig. 3 is the circuit structure diagram of STC89C52 single chip.

Fig. 4 is matrix keyboard structure chart.

The structure of Fig. 5 OP07 and interface connection figure with DAC0832.

The connection type structure chart of Fig. 6 liquid crystal displays and STC89C52 single chip.

Specific implementation mode

To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, below to the utility model Specific implementation mode elaborate.Many details are elaborated in the following description in order to fully understand this practicality It is novel.But the utility model can be much to implement different from other manner described here, those skilled in the art can To do similar improvement without prejudice to the utility model connotation, therefore the utility model is not by following public specific reality Apply the limitation of mode.

Embodiment 1, in conjunction with Fig. 1 to Fig. 6, the SCM Based step signal generator, including peripheral control electricity Road, STC89C52 single chip, DAC0832 digital analog converters, OP07 operation amplifiers chip and 1602 liquid crystal displays；It is described outer Control circuit connection STC89C52 microcontrollers are enclosed, STC89C52 single chip is sequentially connected DAC0832 digital analog converters, OP07 fortune Amplification chip is calculated, the design parameter of 1602 liquid crystal display real-time display waveforms is passed through.It is used as master by STC89C52 single chip Chip is controlled, transformation of the digital signal to analog signal is realized by DAC0832 analog-digital chips, then filter by OP07 amplifiers Wave amplification output, is then shown by oscillograph.

The peripheral control circuits matrix keyboard, directly connect with STC89C52 single chip.The matrix keyboard uses 4*4 Matrix keyboard mode controls the variation of the parameters of staircase waveform to realize extraneous real-time input.If pressing needed for system Bond number amount, which is more than 8, should just use matrix keyboard, and the suitable matrix keyboard of specification is chosen according to specific service condition. Keyboard is divided into the keyboard of coding form and the keyboard of non-encoded form, this system to use the keyboard of non-encoded form, use software Programming Control input display.Specific key assignments is arranged to each button, Switch-case languages are used in key assignments handles function Sentence calls key assignments, makes corresponding processing according to corresponding key assignments, and the key assignments of acquisition is shown by 1602 liquid crystal displays Out.

This system is after just starting power up, and the interface of meeting display system initialization, that is, show exponent number 10 on liquid crystal display (it is 0~5V that system, which really exports adjustable voltage range, and 0~255V of input is 5V by rank, frequency 100Hz, quantization amplitude 200V Quantization input value, this is done to input conveniently.) interface.After system default presses input button, first is adjusted The parameter of section is exponent number, if wanting the exponent number of change staircase waveform at this time, only need to press required exponent number value and press acknowledgement key It will complete the adjusting of staircase waveform exponent number；If it is intended to adjusting the frequency of staircase waveform, can be found after pressing enter key for the first time Exponent number please be input when interface prompt, at this moment presses switch key, at this moment system can by parameter switching to the interface of input frequency The adjusting of frequency can be realized by pressing required numerical value with the button figure of compares figure 4, and determination key is pressed just after pressing numerical value It can complete primary complete operation.In the foregoing description, the case where being pushed the wrong if there is numerical value, can also press BACK keys into Row re-enters operation.Parameter if necessary to adjusting is amplitude, after pressing enter key, consecutively presses and switches twice Be switched to and ask input range interface, input after required range value press determination key can.Pay attention to described above arrive Otherwise the numerical value of the adjusting of three kinds of parameters of staircase waveform, input all must just will appear and go beyond the scope in defined numberical range Prompt.

The circuit structure diagram of STC89C52 single chip is as shown in Figure 2 and Figure 3, not shown two pins difference in wherein Fig. 2 It is 20 pins and 40 pins, one is used as ground terminal, and one is used as power end.Pin 1~8 as shown in the figure is P1.0~P1.7 standards Two-way I/O mouths.9th pin RST is the electrification reset end of microcontroller.Pin 10~17 is P3 mouthfuls of two-way I/O mouthfuls of standard.The 18,19 pin, external clock pin.For clock there are two types of mode, this system uses piece internal clock mode, external in 18,19 pins Quartz crystal and oscillating capacitance, oscillating capacitance use specification for capacitance (18 and 19 pin in the case of system worked well of 22PF Voltage should be respectively 1V mostly more with 2V).31st pinSince STC89C52 has internal program memory, so The pin connects high level in this system.P0 mouthfuls of 39-32 pins it is general in order to enable output normally can external 10K Ω pull-up electricity Resistance.

The circuit structure of specific DAC0832 as shown in figure 5, each pin be defined as follows：- chip selection signal input terminal, Effective use state is low level.

The write gate input terminal of-input register.

DI0~DI7 --- data input pin.

Benchmaring mouth of the ports VREF-as input voltage, the termination+5V DC power supplies in this system.

Rfb-feedback point hinders end, this end of chip interior and connects the resistance there are one 15k Ω.

IOUT1-output end, in the form of electric current as the form of output data.When the data of input terminal input are all 1 When, electric current is maximum.

IOUT2-output end, in the form of electric current as the form of output data, the sum of value and the ends IOUT1 electric current are One constant.

The transmission of control signals input port of-data, effective use state are low level.

- the input terminal has write gate characteristic, Pulse Width Control, effective (width of pulse persistance when for negative pulse It should be greater than 500ns).

The block storage of ILE-data allows signal input part, high level effective.

VCC-power voltage terminal, the termination+5V DC power supplies in this system.

The reference edge of GND --- supply voltage.

OP07 operation amplifiers chip implement body structure described herein and its connection relation with DAC0832, such as Fig. 6 It is shown.

By the design of above structure, keep the structure of the SCM Based step signal generator simpler, Volume smaller, manufacturing cost is lower, preferably eliminates higher hamonic wave, and it is simpler realize frequency modulation, adjust exponent number and The function of harmonic.

Embodiment 2, based on the above technical solution, as shown in fig. 6, described 1602 data port and microcontroller P1 mouthfuls are connected, and the ports RS are connected the ports R/W and the port P2.6, E of microcontroller and the P2.7 phases of microcontroller with the P2.5 of microcontroller Even.

The generally optional 12V and 5V of power supply applied in the application is comparatively common because of its circuit structure, And those skilled in the art can directly design offer, therefore in this not go into detail its concrete structure.

The major design point of the application is, is used as Master control chip by STC89C52 single chip, passes through DAC0832 numbers Mould conversion chip realizes transformation of the digital signal to analog signal, then is exported by OP07 amplifier filter and amplifications, passes through 1602 liquid The design parameter of crystal display screen real-time display waveform.To make the structure of the SCM Based step signal generator Simpler, volume smaller, manufacturing cost is lower, preferably eliminates higher hamonic wave, and it is simpler realize frequency modulation, The function of exponent number and harmonic is adjusted, therefore for the fine structure of some off-design points, because to those skilled in the art Circuit structure can directly be had more to realize, therefore no longer do more detailed repeat.

Claims

1. a kind of SCM Based step signal generator, it is characterised in that：It is mono- including peripheral control circuits, STC89C52 Piece machine, DAC0832 digital analog converters, OP07 operation amplifiers chip and 1602 liquid crystal displays；Made using STC89C52 single chip It is adopted using DAC0832 analog-digital chips and amplifier OP07 composition D/A conversion circuits and I/V conversion circuits for Master control chip Input control is carried out with 4*4 matrix keyboards, the real-time display of parameters is realized eventually by 1602 liquid crystal displays.

2. SCM Based step signal generator according to claim 1, it is characterised in that：The peripheral control Circuit matrix keyboard is directly connect with STC89C52 single chip.

3. SCM Based step signal generator according to claim 2, it is characterised in that：DAC0832 is used The data port of direct mode operation, DAC0832 is directly connected with the P0 of STC89C52 single chip mouths；OP07 operation amplifier chips 2 pin of inverting input of level-one operational amplifier and the current output terminal I of DAC0832_OUT1It is connected, 3 pin of normal phase input end Be grounded and with the I of DAC0832_OUT2It is connected；The reverse input end 2 of 6 pin of level-one amplifier output end and two-level operating amplifier draws Foot is connected, and 6 pin of output end of the positive input end grounding of two level amplifier, two level amplifier uses oscillograph as waveform output end Observation can see ideal output waveform.

4. SCM Based step signal generator according to claim 1 or 2, it is characterised in that：Liquid crystal display Screen is connected for 1602, described 1602 data port with the P1 of microcontroller mouths, the ports RS be connected with the P2.5 of microcontroller the ports R/W and The port P2.6, E of microcontroller is connected with the P2.7 of microcontroller.