CN108803458A - A kind of transient current waveform recording and calling system based on DSP - Google Patents
A kind of transient current waveform recording and calling system based on DSP Download PDFInfo
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- CN108803458A CN108803458A CN201810972211.XA CN201810972211A CN108803458A CN 108803458 A CN108803458 A CN 108803458A CN 201810972211 A CN201810972211 A CN 201810972211A CN 108803458 A CN108803458 A CN 108803458A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- Automation & Control Theory (AREA)
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Abstract
The transient current waveform recording and calling system that the invention discloses a kind of based on DSP, including current sensor, signal conditioning circuit, dsp processor, reset circuit, level shifting circuit, external memory, clock module, power module and display module；The dsp processor is integrated with ADC module, JTAG modules and GPIO modules；The current sensor is connect with signal conditioning circuit；The signal conditioning circuit is connect by ADC module with dsp processor；The dsp processor is connect with power module, clock module and reset circuit respectively；The JTAG modules of the dsp processor are connect by emulator with computer；The GPIO modules of the dsp processor are connect by level shifting circuit with display module；The dsp processor is connect with external memory.The present invention can accurately measure the current signal of milliampere rank, can also be captured to the signal that the duration is millisecond even microsecond.
Description
Technical field
The invention belongs to field of electronic design, specially a kind of transient current waveform recording and calling system based on DSP.
Background technology
In circuit transition transient, it sometimes appear that acyclic transient current, waveform changes quickly, the duration
It is very short.Entire transient process is completed in several milliseconds even several microseconds, and size of current is milliampere grade, is observed with analog oscilloscope
When transient current signal waveform, be unable to get due to that cannot carry out that period multiple scanning is shown and stablize clearly waveform, also without
Method obtains the parameters such as time constant, peak value, the time to peak in transient process.In process of scientific research, stored digital is mostly used greatly
Oscillograph stores transient current waveform, and obtains the parameter of waveform by the post-processing of computer.Due to the use of of high cost, behaviour
Make to get up more complicated so that it is restricted in the application of many occasions.
Invention content
In view of the deficiencies of the prior art, the technical issues of present invention intends to solve is to provide a kind of transient current based on DSP
Waveform recording and calling system.
The technical solution that the present invention solves the technical problem is to provide a kind of transient current waveform recording based on DSP
With calling system, it is characterised in that the system includes current sensor, signal conditioning circuit, dsp processor, reset circuit, electricity
Flat conversion circuit, external memory, clock module, power module and display module；The dsp processor be integrated with ADC module,
JTAG modules and GPIO modules；
The current sensor is connect with signal conditioning circuit；The signal conditioning circuit passes through ADC module and DSP processing
Device connects；The dsp processor is connect with power module, clock module and reset circuit respectively；The JTAG of the dsp processor
Module is connect by emulator with computer；The GPIO modules of the dsp processor pass through level shifting circuit and display module
Connection；The dsp processor is connect with external memory.
Compared with prior art, advantageous effect of the present invention is：
1, the present invention can accurately measure the current signal of milliampere rank, be the millisecond even letter of microsecond to the duration
It number can also capture, data can complete the acquisition to transient current signal and be stored to outside to deposit by dsp processor
In reservoir, after to be sampled, the sampled data in external memory is called, it is filtered, the processing such as operation obtain
Transient current value and waveform parameter, and shown by display module.It, on computers can be external by CCS4.1 softwares
Data in portion's memory are drawn to observe current waveform.In addition, the present invention can not only survey direct current signal, can also survey
AC signal has and compares wide applicability.
2, N2782B type current sensor noises are relatively low, frequency response is flat, insertion loss is low selected by the present invention, to load
Characteristic will not have an impact, and built-in DEMAG functions can be eliminated because of break-make power switch or the excessive electric current institute in magnetic core of input
The residual magnetism of generation.
3, filtering mode of the invention is realized by MATLAB auxiliary DSPs, the voltage intrinsic in addition to can avoid analog filter
Outside the problems such as drift, temperature drift and noise, moreover it is possible to meet strict demand of the filter to amplitude and phase.
4, display module selects 12864 liquid crystal displays of ST7920 chip drives control, with similar LCD MODULE
Compare, program and circuit structure are relatively succinct, and price is relatively low.
5, dsp processor is as the system core, and data-handling capacity is strong, memory capacity is big, reliability is high, stability
It is good.
Description of the drawings
Fig. 1 is that the present invention is based on the transient current waveform recordings of DSP and a kind of system of embodiment of calling system integrally to tie
Structure schematic block diagram.
Fig. 2 is that the present invention is based on the signal condition of the transient current waveform recording of DSP and a kind of embodiment of calling system electricity
Road schematic diagram.
Fig. 3 is that the present invention is based on the JTAG modules of the transient current waveform recording of DSP and a kind of embodiment of calling system are former
Reason figure.
Fig. 4 is that the present invention is based on the reset circuit of the transient current waveform recording of DSP and a kind of embodiment of calling system originals
Reason figure.
Fig. 5 is that the present invention is based on the level conversion of the transient current waveform recording of DSP and a kind of embodiment of calling system electricity
The first 74LVC4245 chip concept figures on road.
Fig. 6 is that the present invention is based on the level conversion of the transient current waveform recording of DSP and a kind of embodiment of calling system electricity
The 2nd 74LVC4245 chip concept figures on road.
Fig. 7 is that the present invention is based on the transient current waveform recordings of DSP and a kind of external memory of embodiment of calling system
Schematic diagram.
Fig. 8 is that the present invention is based on the transient current waveform recordings of DSP and a kind of display module of embodiment of calling system
Interface circuit schematic diagram.
Specific implementation mode
Specific embodiments of the present invention are given below.Specific embodiment is only used for that present invention be described in more detail, unlimited
The application scope of the claims processed.
The transient current waveform recording that the present invention provides a kind of based on DSP and calling system (abbreviation system, referring to Fig. 1-
8), it is characterised in that the system includes current sensor 1, signal conditioning circuit 2, dsp processor 3, reset circuit 4, level turn
Change circuit 5, external memory 6, clock module 7, power module 8 and display module 9；The dsp processor 3 is integrated with ADC moulds
Block, JTAG modules and GPIO modules；
The current sensor 1 is connect with signal conditioning circuit 2；The signal conditioning circuit 2 passes through ADC module and DSP
Processor 3 connects；The dsp processor 3 is connect with power module 8, clock module 7 and reset circuit 4 respectively；At the DSP
The JTAG modules of reason device 3 are connect by emulator with computer, and computer is able to access that DSP processing by simulation software CCS4.1
All resources of device 3 complete in-circuit emulation and debugging；The GPIO modules of the dsp processor 3 by level shifting circuit 5 with
Display module 9 connects；The high level of display module 9 is 5V, and the high level of dsp processor 3 is 3.3V, is needed in dsp processor 3
Level shifting circuit 5 is added between display module 9 to connect the two；The dsp processor 3 connects with external memory 6
It connects, by acquisition, data are stored in external memory 6 with treated.
The model N2782B of the current sensor 1；The model of the emulator is Suo Sida electronics
XDS510PLUS。
The signal conditioning circuit 2 (referring to Fig. 2) is the low level signal amplification electricity based on four high guaily unit integrated chip TLC2274
Road realizes 100 times of functions of amplifying and carry out 1.5V voltage liftings to voltage signal；Output voltage signal VoWith input electricity
Press signal ViBetween relationship be：Vo=100Vi+1.5；Switching diode BAV99 is accessed in circuit output end, to output electricity
Pressure amplitude value carries out amplitude limit, shields.The circuit of the signal conditioning circuit 2 is constituted：The pin 1 of resistance R1 connects electric current biography
The input voltage signal of sensor 1；The pin 2 of resistance R1 connects the pin 2 of R3 and the pin 3 of TLC2274 chips；The pin of resistance R3
1 connects 1.5V voltages；The pin 4 of TCL2274 chips connects 3.3V voltages；The pin 1 of resistance R2 connects 2 He of pin of TCL2274 chips
The pin 1 of R4；The pin 2 of resistance R2 connects the pin 1 of TCL2274 chips and the pin 1 of resistance R5；The pin 2 of resistance R4 is grounded；
The pin 2 of resistance R5 connects the pin 1 of capacitance C3 and the pin 3 of switching diode BAV99；The pin 2 of capacitance C1 is grounded；Switch two
The pin 1 of pole pipe BAV99 is grounded；The pin 2 of switching diode BAV99 connects 3V voltages.
The dsp processor 3 is TMS320F28335 type dsp chips；
The circuit of the JTAG modules is constituted：Pin 1 is selection test pattern；Pin 2 is test reset
End；Pin 3 is test data input terminal；Pin 5 connects power supply；Pin 7 is test data output end；Pin 9 and pin 11 are to survey
Try input end of clock；Pin 13 and two interrupting input ends that pin 14 is emulator；Pin 4, pin 6, pin 8, pin 10
It is grounded with pin 12.
The reset circuit 4 uses SP708S chips；Dsp processor 3 resets for low level, when a system is powered up, chip
SP708S generates the low level pulse of a 200ms by pin 7, and dsp processor 3 is made to complete to reset；In 3 work of dsp processor
During work, hand-reset can also be carried out by button S1.The circuit of reset circuit 4 is constituted：SP708S cores
Piece pin 1 is hand-reset；SP708S chip pins 2 connect the pin 1 and power supply of capacitance C2；The pin 2 of capacitance C2 is grounded；
SP708S chip pins 7 connect the reset pin of dsp processor 3；SP708S chip pins 3, pin 4 and pin 5 are grounded；SP708S
Chip pin 6 and pin 8 are vacant.
The chip of the level shifting circuit 5 uses 74LVC4245 (referring to Fig. 5 and Fig. 6)：Pass through 74LVC4245 chips
To complete level conversion function, Read-write Catrol and then display data of the realization dsp processor 3 to display module 9；To 12864 liquid
The read-write operation of crystal module needs 8 data pins and 3 controlling switch, and a piece of 74LVC4245 can most multipair 8 road signal progress
Conversion, therefore need to use two panels 74LVC4245 chips；The pin 3-5 of first 74LVC4245 chips connects dsp processor 3 respectively
GPIO8-GPIO10；The pin 1 of first 74LVC4245 chips connects the pin 1 and 5V voltages of capacitance C17；The pin 2 of capacitance C3 connects
Ground；The pin 1 of capacitance C4 connects 3V voltages, the pin 23 of the first 74LVC4245 chips and pin 24；The pin 2 of capacitance C4 is grounded；
Pin 11, pin 12, pin 13 and the pin 22 of first 74LVC4245 chips are grounded；The pin 2 of first 74LVC4245 chips,
Pin 6-10, pin 14-18 are vacant；The pin 21-19 of first 74LVC4245 chips connects drawing for 12864 liquid crystal displays respectively
Foot 4-6；
The pin 3-10 of 2nd 74LVC4245 chips meets the GPIO0-GPIO7 of dsp processor 3 respectively；Second
The pin 21-14 of 74LVC4245 chips meets the pin 7-14 of 12864 liquid crystal displays respectively；2nd 74LVC4245 chips draw
Foot 1 connects the pin 1 and 5V voltages of capacitance C5；The pin 2 of capacitance C5 is grounded；The pin 1 of capacitance C6 connects 3V voltages, second
The pin 23 and pin 24 of 74LVC4245 chips；The pin 2 of capacitance C6 is grounded；The pin 11 of 2nd 74LVC4245 chips draws
Foot 12, pin 13 and pin 22 are grounded；The pin 2 of 2nd 74LVC4245 chips is vacant.
The external memory 6 is IS61LV6416 cake cores (referring to Fig. 7), which is 64 × 16 high speed statics
RAM has A0~A18 totally 19 address wires using 3.3V power supply power supplies, D0~D15 totally 16 data lines.IS61LV6416 chips
Pin 1-5, pin 18-28 and pin 42-44 are address line end；IS61LV6416 chip pins 7-10, pin 13-16, pin
29-32 and pin 35-38 is data line end；IS61LV6416 chip pins 6 connect the chip selection signal of dsp processor 3；
IS61LV6416 chip pins 41 and pin 17 connect the read-write of dsp processor 3 respectively；The pin 1 of capacitance C7 connects 3.3V electricity
Pressure, IS61LV6416 chip pins 11 and pin 33；The pin 2 of capacitance C9 is grounded；IS61LV6416 chip pins 12, pin
34, pin 39 and pin 40 are grounded.
The display module 9 is 12864 liquid crystal displays of ST7920 chip drives control, and resolution ratio 128*64 is interior
Set 8192 16*16 point Chinese characters and 128 16*8 point ascii character-sets；The interface circuit composition of display module 9 is (referring to figure
8)：The pin 1 and pin 20 of 12864 liquid crystal displays are grounded；Pin 2, pin 15 and the pin 19 of 12864 liquid crystal displays connect
5V voltages；The pin 4-6 of 12864 liquid crystal displays meets the pin 21-19 of the first 74LVC4245 chips respectively；12864 liquid crystals
Show that the pin 7-14 of device meets the pin 21-14 of the 2nd 74LVC4245 chips respectively；Pin 3, the pin of 12864 liquid crystal displays
16, pin 17 and pin 18 are vacant.
The clock module 7 uses DSP internal oscillators as clock source, and 30MHZ is inscribed and generates clock letter without source crystal
Number.
Design of System Software is as follows：When dsp processor 3 after the power is turned on, carry out the initialization of system, mainly include variable, letter
Several statements, the input and output definition of port, initialization WatchDog Timer, PLL frequencys multiplication, peripheral clock, PIE interrupt control and post
Storage, interrupt vector table etc..After detecting signal, ADC module is triggered into line number by the way that timer TIMER2 interruptions are arranged
According to acquisition.Sampling period is set as 1us, the i.e. sample rate of 1MSPS, and the sampling time is set to 50ms, and a period can collect 50000
A data point.FIR filtering is realized that the high frequency spurs that the ADC module to eliminate dsp processor 3 is subject to are dry by MATLAB auxiliary DSPs
It disturbs.Filter is set as 39 rank low-pass filters by MATLAB softwares, sample frequency is set as 1MHz, and cutoff frequency is set as
50KHz.After the completion of parameter setting, MATLAB softwares can automatically generate required filter coefficient.By the filtering system of Software Create
Number, which is imported into CCS4.1 softwares, to be programmed, and can realize that FIR is filtered.
Operation principle and workflow the present invention is based on the transient current waveform recording of DSP and calling system are：It is being
When system powers on, dsp processor 3 reset by reset circuit 4 completes internal initialization, into normal operating conditions；Transient state electricity
Signal is flowed after over-current sensor 1, is converted into voltage signal, and output voltage ratio is 0.1V/A；The ADC module of dsp processor 3
The voltage range of 0-3V can only be acquired, it is therefore desirable to the voltage signal for exporting current sensor 1 by signal conditioning circuit 2 into
Row amplification；The ADC module of dsp processor 3 is acquired amplified voltage signal, and the data of acquisition are stored to outside and are deposited
In reservoir 6；After one wheel sampling, dsp processor 3 calls the data in external memory 6, is filtered to it, operation etc.
Processing obtains transient current value and waveform parameter and stores the data in external memory 6；9 display waveform parameter of display module
Or the current value at a certain moment.After the completion, system entrance, which waits until, is received again by outer triggering signal.In addition, computer is logical
It crosses CCS4.1 softwares dsp processor 3 is programmed and is debugged, data and drawing in external memory 6 can be read to observe
Current waveform.
The present invention does not address place and is suitable for the prior art.
Claims (10)
1. a kind of transient current waveform recording and calling system based on DSP, it is characterised in that the system include current sensor,
Signal conditioning circuit, dsp processor, reset circuit, level shifting circuit, external memory, clock module, power module and aobvious
Show module；The dsp processor is integrated with ADC module, JTAG modules and GPIO modules；
The current sensor is connect with signal conditioning circuit；The signal conditioning circuit is connected by ADC module and dsp processor
It connects；The dsp processor is connect with power module, clock module and reset circuit respectively；The JTAG modules of the dsp processor
It is connect with computer by emulator；The GPIO modules of the dsp processor are connect by level shifting circuit with display module；
The dsp processor is connect with external memory.
2. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that the electricity
The model N2782B of flow sensor；The model of the emulator is the XDS510PLUS of Suo Sida electronics.
3. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that the letter
Number modulate circuit is the small signal amplification circuit based on four high guaily unit integrated chip TLC2274；The circuit of the signal conditioning circuit
Composition is：The pin 1 of resistance R1 connects the input voltage signal of current sensor 1；The pin 2 of resistance R1 connects 2 He of pin of R3
The pin 3 of TLC2274 chips；The pin 1 of resistance R3 connects 1.5V voltages；The pin 4 of TCL2274 chips connects 3.3V voltages；Resistance
The pin 1 of R2 connects the pin 2 of TCL2274 chips and the pin 1 of R4；The pin 2 of resistance R2 connects 1 He of pin of TCL2274 chips
The pin 1 of resistance R5；The pin 2 of resistance R4 is grounded；The pin 2 of resistance R5 connects the pin 1 and switching diode BAV99 of capacitance C3
Pin 3；The pin 2 of capacitance C1 is grounded；The pin 1 of switching diode BAV99 is grounded；The pin 2 of switching diode BAV99 connects
3V voltages.
4. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described
Dsp processor is TMS320F28335 type dsp chips.
5. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described
The circuit of JTAG modules is constituted：Pin 1 is selection test pattern；Pin 2 is test reset end；Pin 3 is that test data is defeated
Enter end；Pin 5 connects power supply；Pin 7 is test data output end；Pin 9 and pin 11 are test clock input terminal；13 He of pin
Pin 14 is two interrupting input ends of emulator；Pin 4, pin 6, pin 8, pin 10 and pin 12 are grounded.
6. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described multiple
Position circuit uses SP708S chips；The circuit of reset circuit is constituted：SP708S chip pins 1 are hand-reset；SP708S cores
Piece pin 2 connects the pin 1 and power supply of capacitance C2；The pin 2 of capacitance C2 is grounded；SP708S chip pins 7 connect dsp processor 3
Reset pin；SP708S chip pins 3, pin 4 and pin 5 are grounded；SP708S chip pins 6 and pin 8 are vacant.
7. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that the electricity
The chip of flat conversion circuit uses 74LVC4245：The pin 3-5 of first 74LVC4245 chips connects dsp processor respectively
GPIO8-GPIO10；The pin 1 of first 74LVC4245 chips connects the pin 1 and 5V voltages of capacitance C17；The pin 2 of capacitance C3 connects
Ground；The pin 1 of capacitance C4 connects 3V voltages, the pin 23 of the first 74LVC4245 chips and pin 24；The pin 2 of capacitance C4 is grounded；
Pin 11, pin 12, pin 13 and the pin 22 of first 74LVC4245 chips are grounded；The pin 2 of first 74LVC4245 chips,
Pin 6-10, pin 14-18 are vacant；The pin 21-19 of first 74LVC4245 chips connects drawing for 12864 liquid crystal displays respectively
Foot 4-6；
The pin 3-10 of 2nd 74LVC4245 chips meets the GPIO0-GPIO7 of dsp processor respectively；2nd 74LVC4245 chips
Pin 21-14 meet the pin 7-14 of 12864 liquid crystal displays respectively；The pin 1 of 2nd 74LVC4245 chips connects capacitance C5's
Pin 1 and 5V voltages；The pin 2 of capacitance C5 is grounded；The pin 1 of capacitance C6 connects the pin of 3V voltages, the 2nd 74LVC4245 chips
23 and pin 24；The pin 2 of capacitance C6 is grounded；Pin 11, pin 12, pin 13 and the pin 22 of 2nd 74LVC4245 chips
Ground connection；The pin 2 of 2nd 74LVC4245 chips is vacant.
8. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described outer
Portion's memory is IS61LV6416 cake cores；IS61LV6416 chip pins 1-5, pin 18-28 and pin 42-44 are address wire
End；IS61LV6416 chip pins 7-10, pin 13-16, pin 29-32 and pin 35-38 are data line end；IS61LV6416
Chip pin 6 connects the chip selection signal of dsp processor；IS61LV6416 chip pins 41 and pin 17 connect dsp processor respectively
Read-write；The pin 1 of capacitance C7 connects 3.3V voltages, IS61LV6416 chip pins 11 and pin 33；The pin 2 of capacitance C9 connects
Ground；IS61LV6416 chip pins 12, pin 34, pin 39 and pin 40 are grounded.
9. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described aobvious
Show that module is 12864 liquid crystal displays of ST7920 chip drives control；The interface circuit of display module is constituted：12864 liquid
The pin 1 and pin 20 of crystal display are grounded；Pin 2, pin 15 and the pin 19 of 12864 liquid crystal displays connect 5V voltages；
The pin 4-6 of 12864 liquid crystal displays meets the pin 21-19 of the first 74LVC4245 chips respectively；12864 liquid crystal displays
Pin 7-14 meets the pin 21-14 of the 2nd 74LVC4245 chips respectively；Pin 3, pin 16, the pin of 12864 liquid crystal displays
17 and pin 18 it is vacant.
10. transient current waveform recording and calling system according to claim 1 based on DSP, it is characterised in that described
Clock module uses DSP internal oscillators as clock source, and 30MHZ is inscribed and generates clock signal without source crystal.
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| CN201810972211.XA CN108803458A (en) | 2018-08-24 | 2018-08-24 | A kind of transient current waveform recording and calling system based on DSP |
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Application publication date: 20181113 |
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