CN109217928A - A kind of method that analog signal is transmitted at a distance - Google Patents
A kind of method that analog signal is transmitted at a distance Download PDFInfo
- Publication number
- CN109217928A CN109217928A CN201811233440.6A CN201811233440A CN109217928A CN 109217928 A CN109217928 A CN 109217928A CN 201811233440 A CN201811233440 A CN 201811233440A CN 109217928 A CN109217928 A CN 109217928A
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- Prior art keywords
- voltage
- frequency
- signal
- conversion portion
- transmitted
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
Abstract
The invention discloses a kind of methods that analog signal is transmitted at a distance, voltage-frequency and frequency-voltage conversion circuit are constituted using AD650, first convert analog signals into the signal wave of ± 5 V of section, become the square-wave pulse column of certain frequency by voltage-frequency conversion, it is transmitted through the optical fiber to the control centre of distant place, then spike train feeding frequency-voltage conversion circuit is reduced into voltage signal again, is ultimately delivered to controller and is handled.The solution of the present invention can effectively transmit high frequency analog signals, not only undamped, but also have good anti-interference ability, and transmission range, up to 200 m, delay is less than 100us in transmission process.
Description
Technical field
The present invention relates to signal control and processing technology field more particularly to a kind of sides that analog signal is transmitted at a distance
Method.
Background technique
In the TT&C system based on microprocessor, rapidly and accurately the parameter of the electrical physical quantity of capture site is to implement
The basis of automatic control and condition；And in most of TT&C systems, controller and controlled device often have certain distance, electromagnetism
Interference signal is inevitably mixed into connecting wire.Especially at nuclear fusion field (the full superconduction tockmark device of such as EAST),
Very strong magnetic field is dispersed with around device, control object and control system often need to separate at a distance, at this moment just need to pass
Analog signal transmission after sensor conversion is then sent through controller after carrying out analog-to-digital conversion (ADC) to control centre and is handled；Together
Sample also has this demand in high-tension apparatus.In order to eliminate the various interference in signal transmission, asked in addition to reasonably handling ground connection
Outlying, it is necessary to make input circuit be isolated from each other with output circuit, then signal is transmitted at a distance.Existing analog signal
Isolation transmission method has direc isolation method and indirect isolation method, and wherein direc isolation method principle is simple but transmission range is short, adjusts
Demodulation method transmission range processed is long, but transmission precision is low.
Summary of the invention
The purpose of the invention is to make up the defect of prior art, a kind of side that analog signal is transmitted at a distance is provided
Method.
The present invention is achieved by the following technical solutions:
A kind of method that analog signal is transmitted at a distance includes voltage sample part, voltage-frequency conversion portion, optical fiber transmission
Part and frequency pressure conversion portion, particular content are as follows:
Voltage sample part: Hall current sensor is mounted on the output end that EAST controls inverter fastly, EAST is controlled fastly
When inverter works normally, EAST controls inverter output end fastly has corresponding electric current to flow out, at this time Hall current sensor
A current signal is exported, the signal wave of a section ± 5V is obtained after resistance sampling, is sent to voltage-frequency as input signal
Conversion portion；
Voltage-frequency conversion portion (V/F): signal wave is that (tens to several hundred for certain frequency through voltage-frequency conversion portion linear transformation
KHz square-wave pulse column), are then passed in the fiber optic transmitter of fibre transmission portions, and optical fiber both ends do not have direct electrical communication,
Realize electrical isolation；
Fibre transmission portions: square-wave pulse signal is become optical signal by fiber optic transmitter, is successively connect by optical fiber and optical fiber
It receives device and transmits optical signals into frequency pressure conversion portion；
Frequency pressure conversion portion: analog voltage signal is converted optical signals to through frequency pressure conversion portion.
The voltage-frequency conversion portion and frequency pressure conversion portion is all made of chip AD650 and realizes voltage-frequency conversion and frequency pressure conversion
's.
The model HFBR1521 of the fiber optic transmitter；The model HFBR2521 of the fiber optic receiver.
Voltage-frequency transfer principle can be described as follows: input voltage signal becomes current signal, integrated device pair through input resistance
Integrating capacitor charging, while capacitance voltage value and internal reference voltage are compared, once reaching threshold value, internal switch is disconnected
Integrating network becomes internal constant-current source to the reverse integral of capacitor, still compared with threshold voltage, when reference voltage size again
It is secondary to repeat the above process, spike train is exported at the same time, to realize that voltage-frequency is converted, and there are voltages bigger, spike train frequency
It is higher.
The invention has the advantages that the present invention utilizes voltage-frequency and frequency-voltage conversion circuit, analog signal is converted through voltage-frequency first and is become
It is arranged at the square-wave pulse of certain frequency, is transmitted through the optical fiber to the control centre of distant place, then spike train is sent into frequency-voltage conversion circuit
It is reduced into voltage signal, voltage signal is finally converted into digital signal feeding controller and is handled.The solution of the present invention can
It is not only undamped effectively to transmit high frequency analog signals, but also have good anti-interference ability, and transmission range reaches 200m, transmission
Delay is less than 100us in the process.
Detailed description of the invention
Fig. 1 is work flow diagram of the invention.
Fig. 2 is voltage-frequency conversion portion circuit diagram.
Fig. 3 is that (Fig. 3 a is integral process circuit diagram to integrating capacitor working principle diagram；Fig. 3 b is reseting procedure circuit diagram).
Fig. 4 is frequency pressure conversion portion circuit diagram.
Fig. 5 is voltage-frequency conversion and frequency pressure conversion connection circuit diagram.
When Fig. 6 is that frequency input signal is less than 1kHz, input-output wave shape figure.
When Fig. 7 is frequency input signal 5kHz, input-output wave shape figure.
Specific embodiment
As shown in Figure 1, a kind of method that analog signal is transmitted at a distance, includes voltage sample part 1, voltage-frequency converter section
Divide 2, fibre transmission portions 3 and frequency pressure conversion portion 4, particular content is as follows:
Voltage sample part 1: Hall current sensor 5 is mounted on the output end that EAST controls inverter 6 fastly, EAST is fast
When controlling the normal work of inverter 6, EAST controls 6 output end of inverter fastly has corresponding electric current to flow out, and Hall current passes at this time
Sensor 5 exports a current signal, and the signal wave of a section ± 5V is obtained after resistance sampling, is sent to as input signal
Voltage-frequency conversion portion；
Voltage-frequency conversion portion 2 (V/F): signal wave is that (tens to several hundred for certain frequency through voltage-frequency conversion portion linear transformation
KHz square-wave pulse column), are then passed in the fiber optic transmitter of fibre transmission portions, and optical fiber both ends do not have direct electrical communication,
Realize electrical isolation；
Fibre transmission portions 3: square-wave pulse signal is become optical signal by fiber optic transmitter, is successively connect by optical fiber and optical fiber
It receives device and transmits optical signals into frequency pressure conversion portion；
Frequency pressure conversion portion 4: analog voltage signal is converted optical signals to through frequency pressure conversion portion.
The voltage-frequency conversion portion 2 and frequency pressure conversion portion 4 is all made of chip AD650 and realizes that voltage-frequency conversion and frequency pressure turn
It changes.
The model HFBR1521 of the fiber optic transmitter；The model HFBR2521 of the fiber optic receiver.
Currently, there are many voltage-frequency conversion chip, is generally selected in terms of function, frequency range, transfer linearity degree, originally set
Meter requires that working frequency is high, the linearity is good, wide input voltage range, selects the high-performance voltage-frequency converter section of U.S. AD company accordingly
Bulk-breaking AD650, AD650 circuit not only can serve as voltage to frequency convert part, but also can be used as frequency-voltage converting portion point.
It is illustrated in figure 2 high-precision V/F conversion portion, input voltage can be linearly converted into arteries and veins by V/F conversion portion
Rush frequency signal, functional relation are as follows:
fx=kVin
In formula, VinFor input voltage；K is transformation coefficient；fxFor output pulse signal frequency.
Input signal VinIt is provided by voltage sample, VinThrough input resistance RinGenerate input current.Pass through 1mA internal current
Source switch control, integrating capacitor CinOn electric current and operational amplifier internal feedback electric current forming circuit reach current source and accurately put down
Weighing apparatus, current direction is as shown in figure 3, this current impulse can be regarded as is made of accurate charge group, open collector transistor
Every amplitude for generating charge group's quantity required for a pulse and depending on input current signal.Due to being transmitted to per unit time
Summing junction (integrating capacitor CinBoth ends) amount of charge to the linear functional relation of current input signal amplitude, so electricity can be realized
Pressure-frequency conversion.Open collector transistor provides frequency output terminal, when monostable multivibrator exports high level, electric current
Source control switch s1It beats to the operational amplifier left side such as Fig. 3 (b), this process is known as reseting procedure；When integrator output voltage reaches
When to predetermined value, current source control switch s1It beats to such as Fig. 3 (a), this process on the right of operational amplifier and is known as integral process.
Input voltage is changed into electric current and gives integrating capacitor CinCharging is less than comparator comparison voltage and lock in integrator voltage
When storage exports high level, integral process terminates, and reseting procedure starts, and at this moment the slope of integrator is latch state upwards
The variation of change triggers monostable multivibrator；Reset starts to integrator output voltage to reach the referred to as touching of predetermined value all time
Send out time tos, it is by triggering capacitor CoCapacitance size determines that at this moment the slope of integrator is upward, and calculation formula is as follows:
tos=Co×6.8×103sec/F+3×10-7sec
Δ V=tos×(1mA-Iin)/Cin
When integrating capacitor charging, the slope of integrator output voltage is downward, until integrator voltage is less than comparator ratio
Compared with voltage and latch exports high level, this time is set as T1, calculation formula is as follows:
T1=tos×(1mA/Iin-1)
It can thus be concluded that voltage-frequency conversion formula is as follows:
As external capacitor CoWith resistance RinWhen determining, output frequency and input voltage linear function；Its feature frequency
Rate finIt is proportional to Vin, and it is related with the resistance in circuit, capacitance.
Input resistance RinIt will limit input voltage range, typically enter electric current no more than 1mA, have:Input resistance RinWith integrating capacitor CinDetermine full scale frequency.In general CoIt is higher, input current
Smaller i.e. RinThe bigger linearity is better, and full scale frequency is also lower；RinAfter determination, and desired full scale frequency is given, then
Timing capacitor CoSize also determine that；Integrating capacitor CinFormula C can be passed throughin=10-4/fmanIt obtains.
Fibre optic data transmission is made of fiber optical transceiver, optical fiber and fibre-optical splice, and optical fiber is fabulous insulator, in optical fiber
Link sends and receives the no direct electrical communication in end.
AD650 is also used as frequency-voltage conversion, and has good performance；Specific design circuit such as Fig. 4 institute
Show, the voltage signal after F/V is converted obtains original signal through signal condition.Frequency signal f after photoelectric conversioninThrough 560pF,
The differential circuit of 500 Ω composition is added to the inverting input terminal of input comparator, when the failing edge of input pulse arrives, inputs ratio
High level is exported compared with device, monostable multivibrator, which is triggered, exports high level, and current source is to integrating capacitor C at this timeintIt is filled
Electricity, charging time are by capacitor CosIt determines.The frequency of input pulse is higher, capacitor CintThe charge of upper accumulation is more, output
Voltage is higher, inputs frequency and output voltage linear function, realizes the transformation of frequency and voltage.Wherein timing electricity
Hold CosIt can be by formula It obtains；Integrating resistor RintIt can be by formulaIt obtains；
Integrating capacitor CintIt can be by formulaIt obtains, t in formularesIt is required that response time, N=6, if output voltage pulsation too
Greatly, it can reduce；The output voltage of FVC circuit can be by Formula Vout=tos×Rint×1mA×finIt obtains.
Fig. 5 is application circuit principle total figure of the Fiber isolation conversion portion in analog signal is transmitted at a distance, passes through reality
Verifying circuit design outputs and inputs waveform phase and amplitude and keeps identical substantially, such as Fig. 6 when waveform frequency is less than 1kHz
It is shown；When waveform frequency is 5kHz, it is slightly smaller to output and input waveform phase about 40us, amplitude, but meet in transmission process and prolong
When be less than 100us, if Fig. 7 is shown.Frequency analog can effectively be transmitted by having waveform diagram 6 and Fig. 7 that can obtain the solution of the present invention
Signal, it is not only undamped, but also have good anti-interference ability, and transmission range reaches 200m, delay is less than 100us in transmission process.
Claims (3)
1. a kind of method that analog signal is transmitted at a distance, it is characterised in that: include voltage sample part, voltage-frequency converter section
Point, fibre transmission portions and frequency pressure conversion portion, particular content is as follows:
Voltage sample part: Hall current sensor is mounted on the output end that EAST controls inverter fastly, EAST controls inversion fastly
When power supply works normally, EAST controls inverter output end fastly has corresponding electric current to flow out, and Hall current sensor exports at this time
One current signal obtains the signal wave of a section ± 5V after resistance sampling, is sent to voltage-frequency conversion as input signal
Part；
Voltage-frequency conversion portion: signal wave is square-wave pulse column through voltage-frequency conversion portion linear transformation, is then passed to optical fiber transport part
In the fiber optic transmitter divided；
Fibre transmission portions: square-wave pulse signal is become optical signal by fiber optic transmitter, successively passes through optical fiber and fiber optic receiver
Transmit optical signals into frequency pressure conversion portion；
Frequency pressure conversion portion: analog voltage signal is converted optical signals to through frequency pressure conversion portion.
2. the method that a kind of analog signal according to claim 1 is transmitted at a distance, it is characterised in that: the voltage-frequency turns
It changes part and conversion portion is pressed to be all made of chip AD650 frequently and realize voltage-frequency conversion and press conversion frequently.
3. the method that a kind of analog signal according to claim 1 is transmitted at a distance, it is characterised in that: the optical fiber hair
Send the model HFBR1521 of device；The model HFBR2521 of the fiber optic receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233440.6A CN109217928A (en) | 2018-10-23 | 2018-10-23 | A kind of method that analog signal is transmitted at a distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233440.6A CN109217928A (en) | 2018-10-23 | 2018-10-23 | A kind of method that analog signal is transmitted at a distance |
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| Publication Number | Publication Date |
|---|---|
| CN109217928A true CN109217928A (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811233440.6A Pending CN109217928A (en) | 2018-10-23 | 2018-10-23 | A kind of method that analog signal is transmitted at a distance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613430A (en) * | 2019-02-18 | 2019-04-12 | 内蒙古伊泰准东铁路有限责任公司 | Electric current determines method and device |
| CN113834991A (en) * | 2021-09-22 | 2021-12-24 | 云南电网有限责任公司电力科学研究院 | Analog quantity remote transmission method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201918010U (en) * | 2010-12-17 | 2011-08-03 | 中国科学院电工研究所 | Voltage-current collecting and transmitting device for high-voltage system |
| CN102142190A (en) * | 2010-02-03 | 2011-08-03 | 华北电力大学 | Long-distance non-loss transmission device of output signals at secondary side of voltage transformer |
| CN201947271U (en) * | 2010-12-14 | 2011-08-24 | 南车南京浦镇车辆有限公司 | Voltage-frequency conversion modulation-demodulation device based on optical fiber communication |
| CN106018941A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Pulse high-voltage measuring platform based on voltage-to-frequency conversion technology |
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2018
- 2018-10-23 CN CN201811233440.6A patent/CN109217928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142190A (en) * | 2010-02-03 | 2011-08-03 | 华北电力大学 | Long-distance non-loss transmission device of output signals at secondary side of voltage transformer |
| CN201947271U (en) * | 2010-12-14 | 2011-08-24 | 南车南京浦镇车辆有限公司 | Voltage-frequency conversion modulation-demodulation device based on optical fiber communication |
| CN201918010U (en) * | 2010-12-17 | 2011-08-03 | 中国科学院电工研究所 | Voltage-current collecting and transmitting device for high-voltage system |
| CN106018941A (en) * | 2016-05-23 | 2016-10-12 | 华中科技大学 | Pulse high-voltage measuring platform based on voltage-to-frequency conversion technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613430A (en) * | 2019-02-18 | 2019-04-12 | 内蒙古伊泰准东铁路有限责任公司 | Electric current determines method and device |
| CN113834991A (en) * | 2021-09-22 | 2021-12-24 | 云南电网有限责任公司电力科学研究院 | Analog quantity remote transmission method and device |
| CN113834991B (en) * | 2021-09-22 | 2024-04-19 | 云南电网有限责任公司电力科学研究院 | Analog quantity remote transmission method and device |
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Application publication date: 20190115 |