CN105929215B - A kind of high-voltage signal isolation Transmission system - Google Patents
A kind of high-voltage signal isolation Transmission system Download PDFInfo
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- CN105929215B CN105929215B CN201610238917.4A CN201610238917A CN105929215B CN 105929215 B CN105929215 B CN 105929215B CN 201610238917 A CN201610238917 A CN 201610238917A CN 105929215 B CN105929215 B CN 105929215B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The invention discloses a kind of high-voltage signals, and Transmission system, including voltage bias module, electric voltage frequency conversion module, electric isolution transmission module, voltage to frequency conversion module, active power filtering module and biasing restoration module is isolated；The voltage bias module is used to apply bias voltage to input signal, obtains first voltage signal；The electric voltage frequency conversion module is used to first voltage signal being converted to frequency signal, the electric isolution transmission module transmits the frequency signal for being isolated, the voltage to frequency conversion module is used to the frequency signal being converted to second voltage signal, the active power filtering module is used to filter out the sawtooth wave noise in the second voltage signal, is restored；The biasing restoration module is for removing bias voltage from the first voltage signal that the active power filtering module restores.Transmission system is isolated in high-voltage signal of the invention, and signals revivification effect is good, and precision is high, and signal delay is low, at low cost, meets the isolation transmission requirement of most of high-voltage signals.
Description
Technical field
The invention belongs to high_voltage isolation fields, and Transmission system is isolated more particularly, to a kind of high-voltage signal.
Background technique
Electron Cyclotron Resonance Heating (Electron Cyclotron Resonance Heating, ECRH) system can be used for
The heating of plasma.Entire ECRH system is on the high voltage platform in -80kV, and minimum insulated degree requirement is 100kV, some
The power supply connection of parameter constant can be become by isolation realizes high_voltage isolation.Even however, high-voltage linear isolation optocoupler, every
It at most can only also accomplish tens kilovolts from degree, therefore based on the isolation of control signal and sampled signal transmission, the light of separate type
Electric isolution means are essential.In addition, sampled signal is also required to realize information transmission within several hundred microseconds, maximum delay is not
It can exceed that 1ms, it is desirable that the high sampled signal time is even less than 0.2ms.
And although existing some Phototube Coupling means have much, but such as TC9401 conversion chip was difficult to the response time
Requirement.Meanwhile in the conversion process of voltage to frequency, due to voltage to frequency conversion chip nature, voltage analog signal
Be easy to produce sawtooth noise, sawtooth wave frequency rate is consistent with conversion frequency when F-V, it is unfiltered before the several hundred millis of amplitude maximum
Volt.(the V when input signal very littleIN=0.1V), corresponding conversion frequency it is lower (as select 40kHz/1V ratio, then 0.1V pairs
Frequency f≤the 4kHz answered), f at this time<f0, sawtooth noise component(s) can not filter.Therefore in signal restoring, voltage analog signal
Other than amplitude and the consistent fundamental wave of original signal, also it is mingled with the sawtooth wave around fundamental wave disturbance.It is being less than the small signal of 0.2V
Under transmission or the high occasion of stability requirement, voltage analog signal is difficult to be stably obtained reduction.Further, since directly selecting
Light emitting diode and the more difficult matching of photodiode, encapsulation is not easy and also inconvenience is realized in the connection of optical fiber, in conclusion working as
Preceding analog circuit isolation scheme, which is difficult to meet, postpones the requirement low, precision is high and Well-recovered.
Summary of the invention
For can not achieve the transmission of small signal and the bad defect of stability in the prior art, it is an object of the invention to
Solve the above technical problem.
To achieve the above object, the present invention provides a kind of high-voltage signals, and Transmission system, the high-voltage signal isolation is isolated
Transmission system includes voltage bias module, electric voltage frequency conversion module, is electrically isolated transmission module, voltage to frequency conversion module, has
Source filter module and biasing restoration module；
The output end of the voltage bias module connects the input terminal of the electric voltage frequency conversion module, the electric voltage frequency
The output end of conversion module connects the input terminal for being electrically isolated transmission module, the output end connection for being electrically isolated transmission module
The output end of the input terminal of the voltage to frequency conversion module, the voltage to frequency conversion module connects the active power filtering module
Input terminal, the output end of the active power filtering module connects the input terminal of the biasing restoration module, biasing recovery mould
Output end of the output end of block as the isolation Transmission system；
The voltage bias module is used to apply bias voltage to input signal, obtains first voltage signal；The voltage
Frequency translation module is used to be converted to first voltage signal frequency signal, and the electric isolution transmission module is for being isolated transmission institute
Frequency signal is stated, the voltage to frequency conversion module is used to the frequency signal being converted to second voltage signal, described active
Filter module is used to filter out the sawtooth wave noise in the second voltage signal, is reduced to first voltage signal；It is described inclined
Restoration module is set for removing bias voltage from the first voltage signal that the active power filtering module restores, completes the high pressure
The isolation of signal is transmitted.
Preferably, the size of the bias voltage is 1.75V~5V.
Preferably, the high-voltage signal isolation Transmission system further includes signal normalization module, the signal normalization mould
Block is set to the front end of the voltage bias module, input terminal of the input terminal as the isolation Transmission system, and output end connects
The input terminal for connecing the voltage bias module, for adjusting to operation interval and exporting voltage signal, the normalization module
For attenuator circuit or amplifying circuit.
Preferably, the voltage bias module include first voltage reference cell and biasing presser unit, described first
The output end of voltage reference cell connects the first input end of the biasing presser unit, described to bias the second of presser unit
Input terminal of the input terminal as the voltage bias module, output end of the output end as the voltage bias module；Described
One voltage reference cell is used to provide the stable bias voltage that fluctuation is less than 2mV；The biasing presser unit is used for will be described
Bias voltage is applied to voltage signal, obtains first voltage signal.
Preferably, the biasing restoration module include second voltage reference cell and biasing remove unit, described second
The output end of voltage reference cell connects the first input end that the biasing removes unit, steady less than 2mV for providing fluctuation
Fixed bias voltage；The biasing removes input terminal of the second input terminal of unit as the biasing restoration module, described inclined
Set output end of the output end for removing unit as the biasing restoration module, for being restored from the active power filtering module
Bias voltage is removed in one voltage signal and is exported.
Preferably, the conversion ratio that the first voltage signal is converted to frequency signal is by the electric voltage frequency conversion module
1V/20kHz~1V/50kHz.
Preferably, the electric isolution transmission module includes photoelectric conversion module and electrooptic conversion module, and the photoelectricity turns
Change the mold input terminal of the input terminal of block as the electrooptic conversion module, the output end of the photoelectric conversion module and the electric light
It is connected between the input terminal of conversion module by optical fiber, the output end of the electrooptic conversion module is as the electrooptic conversion module
Output end；The photoelectric conversion module is used to convert frequency signal to optical signal, and the electrooptic conversion module is used for light
Signals revivification is frequency signal.
Preferably, the ratio of the first voltage signal and the second voltage signal is 1.58~1:1.
Preferably, the active power filtering module is second-order filter module.
Preferably, it is 6kHz~20kHz that the active power filtering module, which filters out the cutoff frequency of the sawtooth wave noise,.
Contemplated above technical scheme through the invention can obtain following beneficial effect compared with prior art：
1, whole modules of high-voltage signal of the invention isolation Transmission system are analog device, do not need the control core such as DSP
Piece, without programming, the voltage signal of overall process processing is analog signal, and output signal can directly act on the CMOS such as comparator
With Transistor-Transistor Logic level chip, virtual voltage directly can also be observed directly by oscilloprobe sampling；
2, bias voltage, the corresponding conversion frequency of bias voltage is added to voltage signal by voltage bias module in the present invention
In 100kHz or so, the sawtooth noise that voltage to frequency conversion chip generates can be filtered by being filtered, noise attentuation can
Small signal can be restored well up to 40dB or more using subsequent removal bias voltage, it is verified for being less than 0.2V
Small signal have good reduction effect；Between the work of voltage bias module, active power filtering module and biasing restoration module
Independently of each other, and it is total with the electric voltage frequency conversion module of intermediate link, electric isolution transmission module and voltage to frequency conversion module
The isolation transmission of high-voltage signal is completed with cooperation；
3, high-voltage signal of the invention isolation Transmission system is able to achieve the real-time Transmission of high voltage analog signal, verified, high
The precision for pressing analog signal transmission is more than 99.5%, and all has preferable reduction effect to high voltage analog signal size and waveform
Fruit can isolate the voltage of 100kV or more, far even if signal delay is still below 150 μ s when selecting the optical fiber of 100m completely
Better than the cumbersome insufficient high-voltage linear optocoupler of stability is designed, it is able to satisfy the isolation transmission requirement of most of high-voltage signals；
4, high-voltage signal of the invention isolation Transmission system is filtered by active power filtering module, and effect is better than simple
RC filter, while transmission plan is isolated as a kind of general high-voltage signal in the invention, can be widely applied to electrical related neck
Domain；
5, high-voltage signal isolation Transmission system of the invention is that modularized design, structure are simple, is convenient for industrial mass
Production.
Detailed description of the invention
Fig. 1 is high-voltage signal isolation Transmission system figure of the present invention；
Fig. 2 is the signal normalization modular structure schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the voltage bias modular structure schematic diagram of the embodiment of the present invention 1；
Fig. 4 is the electric voltage frequency conversion module structural schematic diagram of the embodiment of the present invention 1；
Fig. 5 is the electric isolution transmission module structural schematic diagram of the embodiment of the present invention 1；
Fig. 6 is the voltage to frequency conversion module structural schematic diagram of the embodiment of the present invention 1；
Fig. 7 is the active power filtering modular structure schematic diagram of the embodiment of the present invention 1；
Fig. 8 is the biasing restoration module structural schematic diagram of the embodiment of the present invention 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of high-voltage signals, and Transmission system is isolated, and the high-voltage signal isolation Transmission system includes voltage
Biasing module, electric voltage frequency conversion module, be electrically isolated transmission module, voltage to frequency conversion module, active power filtering module and partially
Restoration module etc. is set, as shown in Figure 1；
Input terminal of the input terminal of the voltage bias module as the isolation Transmission system, output end connect the electricity
The input terminal of voltage-frequency rate conversion module, the bias voltage for applying to voltage signal obtain first voltage signal and export；It applies
The amplitude of the bias voltage added and the voltage signal of front end input, the conversion ratio of rear end electric voltage frequency conversion module and active filter
The cutoff frequency f of wave module0It is all related, since the conversion ratio of electric voltage frequency conversion module is generally 1V/40KHZ, active power filtering
The cutoff frequency f of module0For 7KHz, in order to guarantee the accurate of signal transmission, bias voltage needs to be greater than 10 times of f0× electric voltage frequency
The conversion ratio of conversion module, bias voltage need to be greater than 1.75V；Simultaneously as the voltage signal of front end input is 0V~5V, partially
It sets voltage and is usually less than 5V；
The voltage bias module includes first voltage reference cell and biasing presser unit, the first voltage benchmark
The output end of unit connects the first input end of the biasing presser unit；Second input terminal conduct of the biasing presser unit
The input terminal of the voltage bias module, output of the output end of the biasing presser unit as the voltage bias module
End；The first voltage reference cell generallys use a voltage reference chip, is less than the stable biased electrical of 2mV for providing fluctuation
Pressure is able to maintain higher precision, the electricity to guarantee to pass through the application and subsequent removal of bias voltage in high-voltage signal
Pressure biasing module is used to for the bias voltage to be applied to voltage signal, obtains first voltage signal and exports；
The output end of the electric voltage frequency conversion module connects the input terminal for being electrically isolated transmission module, is used for first
Voltage signal is converted to frequency signal and exports；Delay and filter effect in order to balance, usual conversion ratio are 1V/20kHz~1V/
50kHz, when taking 1V/20kHz, filter effect is more excellent, and when taking 1V/50kHz, delay effect is more excellent；
The electric isolution transmission module includes photoelectric conversion module and electrooptic conversion module, the electric isolution transmission module
Including photoelectric conversion module and electrooptic conversion module, the input terminal of the photoelectric conversion module is as the electrooptic conversion module
Input terminal, between the output end of the photoelectric conversion module and the input terminal of the electrooptic conversion module by optical fiber connect,
It is converted into optical signal for frequency signal will to be had and exports；The output end of the electrooptic conversion module is as the electro-optic conversion
The output end of module connects the input terminal of the voltage to frequency conversion module, for optical signal to be reduced to frequency signal and defeated
Out；The electric isolution transmission module transmits the frequency signal for being isolated；The length of optical fiber is then according to the voltage of required transmission
Depending on size, usual optical fiber is longer, and isolation effect is better, but the delay of signal can be elongated；Electric isolution transmission module of the invention
When selecting the optical fiber of 100m, the still small 150 μ s of signal delay, therefore the up to voltage of 100kV or more can be isolated；
The output end of the voltage to frequency conversion module connects the input terminal of the active power filtering module, is used for the frequency
Rate signal is converted to second voltage signal and exports, and second voltage signal and first voltage signal may be the same or different, and works as the two
When identical, active power filtering module only needs to play filter action, and when the two difference, the difference that the two generates can be by active
Filter module amplifies second voltage signal and is reduced to first voltage signal, due to conversion ratio and the voltage frequency of voltage to frequency
No more than 1.58, therefore usually, first voltage signal and the ratio of the second voltage signal are difference between the conversion ratio of rate
1.58~1:1；
The output end of the active power filtering module connects the input terminal of the biasing restoration module, for filtering out described second
Sawtooth wave noise in voltage signal, while being amplified and being reduced to first voltage signal and export, (but work as second voltage signal
When identical with first voltage signal, then need to only filter merely, without being subjected to reduction step) the active power filtering module is excellent
It is selected as second-order filter module, cutoff frequency setting can be according to voltage to frequency convert ratio and the bias voltage applied size
Determine, comprehensive both the above factor, the range of cutoff frequency generally in 6kHz~20kHz, may be implemented ten times of sawtooth wave noise
Sound interval -40dB decays and the impregnable effect of reference wave；
The biasing restoration module generally includes second voltage reference cell and biasing removes unit, and the biasing is restored
Module include second voltage reference cell and biasing remove unit, the second voltage reference cell output end connection described in
Biasing removes the first input end of unit；The biasing removes the second input terminal of unit as the defeated of the biasing restoration module
Enter end, the biasing removes output end of the output end of unit as the biasing restoration module；The second voltage benchmark list
Voltage reference chip identical with first voltage reference cell can be used in member, identical with first voltage reference cell for providing
Stable bias voltage, the biasing remove unit for removing from the first voltage signal that the active power filtering module restores
Bias voltage simultaneously exports.
When the front voltage signal of high-voltage signal isolation Transmission system input needs front end to amplify or decay, this is
System can also include signal normalization module, and the signal normalization module is set to the front end of the voltage bias module,
Input terminal of the input terminal as the isolation Transmission system, output end connect the input terminal of the voltage bias module, and being used for will
Voltage signal is adjusted to operation interval and is exported, and the normalization module is attenuator circuit or amplifying circuit, is used for front end
The signal spacing that voltage signal amplifies or decays to 5V~8V or so.
Embodiment 1
The high-voltage signal isolation Transmission system of embodiment 1 is turned by signal normalization module, voltage bias module, electric voltage frequency
Change module, be electrically isolated transmission module, voltage to frequency conversion module, active power filtering module and biasing restoration module be sequentially connected and
At；
Fig. 2 is the signal normalization module of embodiment 1, which is attenuator circuit, by R11、R12、R13、
R14、R15It is formed with 15V power supply component IC1 (IC21, IC22, IC6 and IC7 in follow up device are identical as IC1 effect)；Its
In, R14=R15=R11, Decaying at this is divided mainly for RC on 100kV/100V
Device exports low-side signal (0~100V)；It can be seen that R11First end and R13First end and IC1 cathode altogether,
R12First end and R11Second end connection, as the input terminal of signal normalization module, R12Second end connect R13Second
End and R14First end；R11、R12、R13Constitute π type attenuator circuit, herein, R11For the input of attenuator circuit input terminal
Impedance, the attenuation ratio N=10 of attenuator.According to the test result of front end divider, R11Resistance value is 100k Ω, is declined according to π type
The circuit theory of powered down road network：R14Second end connection
The anode and R of IC115First end, IC1 and R15Second end connection, collectively as the output of signal normalization module
End, R14With R15A voltage follower is constituted, the voltage magnitude after making decaying is no longer fluctuated with the variation of output impedance,
Value enables R14=R15=R11?.
Fig. 3 is the voltage bias module of embodiment 1, and the voltage bias module is single by voltage reference cell and biasing pressurization
Member composition, biasing presser unit includes reversed adder and voltage inverter, voltage reference cell, reversed adder and electricity
Pressure phase inverter is sequentially connected：Voltage reference cell is supplied by interface 2 and interface 3 to Ref192 voltage reference chip from the voltage of 5v
Electricity, Ref192 voltage reference chip interface 2 are also connected with the first end of the capacitor of in parallel 10 μ and 0.1 μ, 10 μ in parallel and
The second end of the capacitor of 0.1 μ is grounded, wherein the polar capacitor of 10 μ keeps level more stable, 0.1 μ capacitor is used for for filtering
Decoupling and elimination high-frequency noise；The interface 6 of Ref192 voltage reference chip is equally connected with the capacitor of 1 μ and 0.1 μ in parallel
First end, and connect as the output end of voltage reference cell with the first input end of reversed adder, 1 μ and 0.1 μ in parallel
Capacitor second end ground connection, for ensuring that chip output performance is reliable, the capacitor of 0.1 μ is in parallel therewith for the polar capacitor of 1 μ, uses
In the transient characterisitics for improving circuit, the voltage output of high stability is obtained；The voltage reference cell exports a high stability
2.5V voltage, with input signal Vin2One reacts on amplifier；
Fig. 3 is as it can be seen that R22Second input terminal of the first end as the reversed adder, and as the voltage bias mould
Block input terminal, R21First input end of the first end as the reversed adder, R22And R21Second end connection IC21 it is negative
Pole and R23First end, the plus earth of IC21, output end connect R23Second end, and the output as reversed adder
The input terminal of end connection voltage inverter, R21、R22、R23Signal level is lifted 2.5V and is overturn, input-output equation isR21=R22=R23, thus-Vout21=Vin2+ 2.5, wherein Vin2=Vout1；
R24Input terminal of the first end as voltage inverter, output end connects the cathode and R of IC2225First end,
The plus earth of IC22, the output end and R of IC2225Second end connection, collectively as the output end of voltage bias module, due to
R24=R25, to realize Vout2=-Vout21=Vin2+ 2.5, the purpose of so far voltage lifting is achieved, and zero exports when inputting
Voltage is 2.5V, and corresponding conversion frequency is 100kHz, facilitates the signal processing of subsequent filtering link.
Fig. 4 is the voltage to frequency convert module of embodiment 1, which uses selection AD650 chip, and forward direction input is V-
F circuit；The interface 1 and interface 3 and integrating capacitor C of chipINTParallel connection, interface 2 are grounded, input resistance RINFirst end be voltage
The input terminal of frequency translation module, RINBy two concatenated resistance R31、R32Composition, RINSecond end connecting interface 3, chip
Interface 5 connects the first end of the cathode of 15V voltage source and the capacitor of 0.1 μ, the second end ground connection of 0.1 μ capacitor；Two timings
Capacitor COSAnd COS2First end altogether, second end is connected with each other by button switch, and COSSecond end be connected to interface 6；
Interface 13 is in parallel with the swept resistance of 20k with interface 14, and interface 12 is connect with the first end of the capacitor of another 0.1 μ, and is connected simultaneously
The cathode of 15V voltage source is connect, which is also connected with the first end of 250k resistance, the cunning of the second end connection 20k of 205k resistance
The sliding end of dynamic resistance；Interface 11 connects the second end of the capacitor of 0.1 μ, while connecting simulation ground；Interface 10 connects digitally,
The first end of the capacitor of 1 μ, the first end of the two ends connection 1k resistance of the capacitor of 1 μ and the power supply of 5V are connected simultaneously；Interface 9 connects
Connection interface 1, interface 8 connect the second end of 1k resistance and the simultaneously output end as the voltage to frequency convert module
Its major parameter is chosen as follows：IIN=VIN3/RIN；tOS=COS×6.8×103sec/F+3.0×10-7s。
In the voltage to frequency convert module of the embodiment, it is only necessary to determine four outward elements, i.e. input resistance RIN, timing
Capacitor COS, logic resistance (i.e. the 1k resistance being connect in Fig. 4 with 5V voltage), integrating capacitor CINT.Wherein logic resistance is as pull-up
Resistance should make V-F chip interior transistor current be less than 8mA, such as select 5V logic power, and logic resistance should be not less than 5V/8mA
=625 Ω.RINAnd COSIt determines full scale frequency and input voltage range, while also determining the size of nonlinearity, generally
Come, COSIt is bigger, the smaller (R of input currentINIt is bigger), it is non-linear smaller.Integrating capacitor CINTOnly determine the height of reset cycle voltage
Low, reference value is chosen as the following formula：Based on above reckoning, major parameter selection：COS
100pF capacitor is selected, at this time input resistance RINSize uses 10k Ω resistance in 26k Ω or so, this preferred circuit design
With 20k Ω resistance series system, resistance value is facilitated to adjust, CINTSelect 1000pF capacitor, RIN1k Ω resistance is selected, converts ratio as 1V/
40kHz。
Fig. 5 is the electric isolution transmission module of embodiment 1, the electric isolution transmission module by electric light (E/O) conversion module and
Photoelectricity (O/E) conversion module composition：Successively by logic gate device 75451, HFBR1414 combined chip, 62.5/125 μm of ST interface
Multimode fibre and HFBR2412 combined chip connection composition；Logic gate device 75451 receives foutFrequency signal, and export one
A level signal, the signal enter light emitting diode integration module HFBR1414, and the conversion of low and high level is become diode
Light on and off, by optical fiber by high-frequency frequency optical signal (transformation of high frequency light on and off counterlogic level "high" " low "), right side
High frequency optical signal is demodulated to frequency signal by fiber optic receiver HFBR2412, and the voltage come and frequency are demodulated required for us
It is linear ratio, thereby realizes the isolation transmission of voltage signal, it is contemplated that be electrically isolated transmission module and electronics is returned
The actual requirement of the acquisition control of resonant heating system-related signal is revolved, We conducted E/O conversion module and O/E moduluss of conversion
20m and 100m length of fibre are chosen in the simulated experiment of block in simulated experiment.Test result indicates, is connected with the optical fiber of 20m and 100m
When connecing, the delay of E/O conversion module and O/E conversion module is respectively smaller than 200ns and 600ns, and the 400ns delay of difference is light
In the delay that 80m spread fiber generates, the square wave, triangular wave, sine wave signal for inputting 1MHz errorless can be restored, be compared
Compared with the delay that the part VF and FV generates, part delay can even be ignored, and comprehensive descision, the electric isolution transmission module is enough
Meet system requirements.
Fig. 6 is the voltage to frequency conversion module of embodiment 1, and structure is similar with the voltage to frequency convert module of Fig. 4；Its
In, the connection relationship of interface 5,6,11,12,14 is all identical as voltage to frequency convert module；The first end of capacitor 560pF is as letter
Number input terminal, second end connect 500 Ω resistance first end, the second end connecting interface 9 and diode of 500 resistance
The first end of IN914, the second end connection of diode is digitally；The resistance that interface 9 also passes sequentially through 2k and 500 Ω simultaneously connects
It is connected to the power supply of 5V, interface 8 is connected with the intermediate connections of the resistance of 2k and 500 Ω；Interface 10 is connect with interface 11；Interface
2 ground connection, and input resistance R is parallel on interface 1 and interface 3 simultaneouslyINWith integrating capacitor CINT, integrating capacitor CINTIt is connected by two
Resistance R51、R52Composition, output end of the interface 1 as the voltage to frequency conversion module.
Due to being equally selection AD650 chip, chip characteristics are consistent with the part V/F with principle, only an opposite turn
Process is changed, therefore major parameter selection is as follows：COS100pF capacitor is selected, at this time input resistance RINSize is excellent in 26k Ω or so
10k Ω resistance and 20k Ω resistance series system are used in this circuit design of choosing, and resistance value is facilitated to adjust.CINTSelect 1000pF
Capacitor, RIN1k Ω resistance is selected, converts ratio as 40kHz/1V.
Fig. 7 is the active power filtering module of embodiment 1, R61Input terminal of the first end as the active power filtering module, R61's
Second end connects capacitor C61And R62First end, R62Second end connection IC6 anode and capacitor C62First end；IC6
Cathode connect R and RfFirst end, the second end of R and capacitor C62Second end altogether, capacitor C61Second end and IC6
Output end of the output end collectively as active power filtering module：In order to simplify design, R is enabled in the present invention61=R62=10k Ω, C61=
C62=2.2nF, then corresponding cutoff frequencyF is set0It is greater than ten times for 7.2kHz or so, corresponding 100kHz
Sound interval, sawtooth wave attenuation -45.6dB.Also adjustable filtering parameter makes f0=10kHz, sawtooth wave decays to original at this time
1% (- 40dB).R and R in circuitfCan be in filtering simultaneously to signal and then secondary amplification, it can be to the width of V-F and F-V module
Degree compensates, amplification coefficient AV=(R+Rf)/R, it should be noted thatOtherwise the meeting in signal processing
There is overshoot, is unfavorable for the realization of system function.Since sawtooth wave just reduces with the increase of reference signal amplitude, preferably
In this programme design, sawtooth wave is less than 50mV, therefore after active power filtering, spuious sawtooth wave can be ignored, and passes through in this way
It crosses final bias voltage and removes processing of circuit, output signal and original signal can accomplish that height is consistent, and precision is higher than 99.5%.
And the error of measuring device itself is passed so present invention design is able to satisfy most signal isolation often all between 0.5%~1%
Defeated requirement.
Fig. 8 is biasing restoration module of the invention, removes unit by voltage reference cell and biasing and forms, voltage reference
Unit is identical with the voltage reference cell in voltage bias module, Ref192 voltage reference chip is still used, by signal
Level reduces 2.5V；
R72First end remove the second input terminal of unit as biasing and bias the input terminal of restoration module, for defeated
Enter the voltage signal V of front endin7, Vin7=Vout6；R71, R72Output end connection IC7 anode and R73Input terminal；R71's
First end removes the first input end of unit as biasing, connects the output end of voltage reference cell, R71Second end connect IC7
Anode and R74First end；R73Second end ground connection, the output end and R of IC774Second end removed as biasing it is single
The output end of member and biasing restoration module；
Resistance R based on operational amplifier, in figure71、R72、R73、R74A subtractor circuit is together formed, by simple
Be calculated,R71=R72=R73=R74, finally obtain Vout7=
Vin7-2.5.Signal after front is filtered the biasing restoration module is depressured again, and this completes the shiftings of lifting level
Except work, as shown in Figure 7.
It in summary it can be seen：The real-time isolation transmission of signal may be implemented in high-voltage signal isolation Transmission system of the invention,
It is at low cost, it is delayed short, precision is high, and isolation voltage is greater than 100kV, ensures each analog acquisition inputted through Electron Cyclotron Resonance Heating
Signal can effectively enter controller in real time, while the order of controller also can effectively be transmitted to high voltage control end, design table
Reveal crowd.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. Transmission system is isolated in a kind of high-voltage signal, which is characterized in that including voltage bias module, electric voltage frequency conversion module,
It is electrically isolated transmission module, voltage to frequency conversion module, active power filtering module and biasing restoration module；
The output end of the voltage bias module connects the input terminal of the electric voltage frequency conversion module, the electric voltage frequency conversion
The output end of module connect it is described be electrically isolated transmission module input terminal, it is described be electrically isolated transmission module output end connection described in
The input terminal of voltage to frequency conversion module, the output end of the voltage to frequency conversion module connect the defeated of the active power filtering module
Enter end, the output end of the active power filtering module connects the input terminal of the biasing restoration module, the biasing restoration module
Output end of the output end as the isolation Transmission system；
The voltage bias module is used to apply bias voltage to input signal, obtains first voltage signal；The electric voltage frequency
Conversion module is used to be converted to first voltage signal frequency signal, and the electric isolution transmission module transmits the frequency for being isolated
Rate signal, the voltage to frequency conversion module are used to the frequency signal being converted to second voltage signal, the active power filtering
Module is used to filter out the sawtooth wave noise in the second voltage signal, is reduced to first voltage signal；The biasing is multiple
Former module completes the high-voltage signal for removing bias voltage from the first voltage signal that the active power filtering module restores
Isolation transmission；
The voltage bias module includes first voltage reference cell and biasing presser unit, the first voltage reference cell
Output end connect it is described biasing presser unit first input end, it is described biasing presser unit the second input terminal as institute
State the input terminal of voltage bias module, output end of the output end as the voltage bias module；The first voltage benchmark list
Member is for providing stable bias voltage；The biasing presser unit is used to the bias voltage being applied to voltage signal, obtains
Obtain first voltage signal.
2. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the size of the bias voltage is
1.75V~5V.
3. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the high-voltage signal isolation transmission system
System further includes signal normalization module, input of the input terminal of the signal normalization module as the isolation Transmission system
End, output end connect the input terminal of the voltage bias module, the signal normalization module be used to adjust input signal to
Operation interval simultaneously exports.
4. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the biasing restoration module includes the
Two voltage reference cells and biasing remove unit, and the output end of the second voltage reference cell connects the biasing and removes list
The first input end of member, the biasing removes input terminal of the second input terminal of unit as the biasing restoration module, described
Biasing removes output end of the output end of unit as the biasing restoration module；The second voltage reference cell is for providing
Stable bias voltage；The biasing removes unit for removing from the first voltage signal that the active power filtering module restores
Bias voltage.
5. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the electric voltage frequency conversion module will
The conversion ratio that the first voltage signal is converted to frequency signal is 1V/20kHz~1V/50kHz.
6. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the electric isolution transmission module includes
Photoelectric conversion module and electrooptic conversion module, the input terminal of the photoelectric conversion module is as the defeated of the electrooptic conversion module
Enter end, is connected between the output end of the photoelectric conversion module and the input terminal of the electrooptic conversion module by optical fiber, it is described
Output end of the output end of electrooptic conversion module as the electrooptic conversion module.
7. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the first voltage signal with it is described
The ratio of second voltage signal is 1:1~1.58:1.
8. Transmission system is isolated in high-voltage signal as described in claim 1, which is characterized in that the active power filtering module is second order
Filter module.
9. Transmission system is isolated in high-voltage signal as claimed in claim 8, which is characterized in that the active power filtering module filters out institute
The cutoff frequency for stating sawtooth wave noise is 6kHz~20kHz.
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| CN106410962B (en) * | 2016-09-30 | 2023-09-29 | 华中科技大学 | Mechanical DC breaker controller |
| CN106373374A (en) * | 2016-11-28 | 2017-02-01 | 长沙广义变流技术有限公司 | Small signal isolation transmission circuit |
| CN109507466A (en) * | 2018-11-15 | 2019-03-22 | 上海空间电源研究所 | A kind of high-precision wire sexual isolation sample circuit and its implementation method |
| CN109980924A (en) * | 2019-02-27 | 2019-07-05 | 华中科技大学 | A kind of PSM high voltage power supply based on feedback control |
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| CN102082607A (en) * | 2010-11-30 | 2011-06-01 | 株洲变流技术国家工程研究中心有限公司 | High resolution analog quantity optical fiber conversion method and converter with biasing circuit |
| CN203206217U (en) * | 2013-05-09 | 2013-09-18 | 中国人民解放军63963部队 | Multichannel analog-digital conversion circuit structure |
| CN204810253U (en) * | 2015-03-27 | 2015-11-25 | 西门子电力自动化有限公司 | Analog input circuit |
| CN105223390A (en) * | 2015-10-20 | 2016-01-06 | 天水七四九电子有限公司 | A kind of capacitance coupling type isolated amplifier |
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| KR101596138B1 (en) * | 2014-05-14 | 2016-02-19 | 엘에스산전 주식회사 | Data processing device for high voltage direct current transmission system and method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082607A (en) * | 2010-11-30 | 2011-06-01 | 株洲变流技术国家工程研究中心有限公司 | High resolution analog quantity optical fiber conversion method and converter with biasing circuit |
| CN203206217U (en) * | 2013-05-09 | 2013-09-18 | 中国人民解放军63963部队 | Multichannel analog-digital conversion circuit structure |
| CN204810253U (en) * | 2015-03-27 | 2015-11-25 | 西门子电力自动化有限公司 | Analog input circuit |
| CN105223390A (en) * | 2015-10-20 | 2016-01-06 | 天水七四九电子有限公司 | A kind of capacitance coupling type isolated amplifier |
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