CN105929215A - High-voltage signal isolating transmission system - Google Patents

Abstract

The invention discloses a high-voltage signal isolating transmission system, and the system comprises a voltage bias module, a voltage frequency conversion module, an electric isolation transmission module, a frequency voltage conversion module, an active filtering module, and a bias restoring module. The voltage bias module is used for applying a bias voltage to an input signal, and obtaining a first voltage signal. The voltage frequency conversion module is used for converting the first voltage signal into a frequency signal. The electric isolation transmission module is used for the isolating transmission of the frequency signal. The frequency voltage conversion module is used for converting the frequency signal into a second voltage signal, and the active filtering module is used for filtering sawtooth wave noise in the second voltage signal, and restoring the second voltage signal. The bias restoring module is used for removing a bias voltage from the first voltage signal restored from the active filtering module. The system is good in signal restoration effect, is high in precision, is low in signal time delay, is low in cost, and meets the requirements of most of high-voltage signals on isolating transmission.

Description

A kind of high-voltage signal isolation transmission system

Technical field

The invention belongs to high_voltage isolation field, more particularly, to a kind of high-voltage signal isolation transmission be System.

Background technology

Electron Cyclotron Resonance Heating (Electron Cyclotron Resonance Heating, ECRH) system Can be used for the heating of plasma.Whole ECRH system is on the high voltage platform of-80kV, Little insulated degree requirement is 100kV, and the power supply of some parameter constants connects and can become realization height by isolation Pressure isolation.But, even high-voltage linear isolation optocoupler, its isolation the most also can only accomplish tens Individual kilovolt, therefore isolation based on control signal and sampled signal transmission, the Phototube Coupling hands of separate type Section is essential.Additionally, sampled signal is also required within hundreds of microsecond realize information transmission, maximum Time delay the most not can exceed that 1ms, it is desirable to the high sampled signal time is even less than 0.2ms.

And although more existing Phototube Coupling means have much, but as the conversion chips such as TC9401 are difficult to Requirement to response time.Meanwhile, in the transformation process of voltage to frequency, owing to voltage to frequency is changed Chip nature, voltage analog signal easily produces sawtooth noise, when sawtooth waveforms frequency and F-V Conversion frequency is consistent, unfiltered before the hundreds of millivolt of amplitude maximum.When input signal is the least (V_IN=0.1V), corresponding conversion frequency is relatively low, and (as selected the ratio of 40kHz/1V, then 0.1V is corresponding Frequency f≤4kHz), now f < f₀, sawtooth noise component(s) cannot filter.Therefore when signal restoring, electricity In addition to the first-harmonic that pressure analogue signal is consistent with original signal except amplitude, also it is mingled with around first-harmonic disturbance Sawtooth waveforms.Under the occasion high less than the transmission of 0.2V small-signal or stability requirement, voltage analog is believed Number it is difficult to be stably obtained reduction.Additionally, due to directly select light emitting diode and photodiode relatively Difficult coupling, encapsulation is difficult to, and the connection of optical fiber realizes also inconvenient, in sum, current simulation Circuit isolation scheme is difficult to meet the requirement that delay is low, precision is high and Well-recovered.

Summary of the invention

For prior art can not realize the defect that small-signal transmits and stability is bad, the present invention Purpose be to solve above technical problem.

For achieving the above object, the invention provides a kind of high-voltage signal isolation transmission system, described height Pressure signal-isolated transmission system includes voltage bias module, electric voltage frequency conversion module, electric isolution transmission Module, voltage to frequency modular converter, active power filtering module and biasing restoration module；

The outfan of described voltage bias module connects the input of described electric voltage frequency conversion module, institute The outfan stating electric voltage frequency conversion module connects the input of described electric isolution transport module, described electricity The outfan of isolated transmission module connects the input of described voltage to frequency modular converter, described frequency electricity The outfan of pressure modular converter connects the input of described active power filtering module, described active power filtering module Outfan connect the input of described biasing restoration module, the outfan of described biasing restoration module is made Outfan for described isolation transmission system；

Described voltage bias module is for applying bias voltage to input signal, it is thus achieved that the first voltage signal； Described electric voltage frequency conversion module for being converted to frequency signal, described electric isolution by the first voltage signal Transport module is used for isolating the described frequency signal of transmission, and described voltage to frequency modular converter is for by described Frequency signal is converted to the second voltage signal, and described active power filtering module is used for filtering described second voltage Sawtooth waveforms noise in signal, is reduced to the first voltage signal；Described biasing restoration module is used for From the first voltage signal of described active power filtering module reduction, remove bias voltage, complete described high pressure The isolation transmission of signal.

Preferably, the size of described bias voltage is 1.75V～5V.

Preferably, described high-voltage signal isolation transmission system also includes signal normalization module, described letter Number normalization module is arranged at the front end of described voltage bias module, and its input passes as described isolation The input of communication system, outfan connects the input of described voltage bias module, for being believed by voltage Number adjusting to operation interval and export, described normalization module is attenuator circuit or amplifying circuit.

Preferably, described voltage bias module includes the first voltage reference cell and biasing presser unit, The outfan of described first voltage reference cell connects the first input end of described biasing presser unit, institute State biasing presser unit the second input as the input of described voltage bias module, outfan Outfan as described voltage bias module；Described first voltage reference cell is used for providing fluctuation little Stable bias voltage in 2mV；Described biasing presser unit is for putting on described bias voltage Voltage signal, it is thus achieved that the first voltage signal.

Preferably, described biasing restoration module includes that the second voltage reference cell and biasing remove unit, The outfan of described second voltage reference cell connects described biasing and removes the first input end of unit, uses In providing the fluctuation stable bias voltage less than 2mV；Described biasing removes the second input of unit As the input of described biasing restoration module, described biasing remove the outfan of unit as described partially Put the outfan of restoration module, move for the first voltage signal from the reduction of described active power filtering module Except bias voltage and export.

Preferably, described first voltage signal is converted to frequency signal by described electric voltage frequency conversion module Conversion ratio be 1V/20kHz～1V/50kHz.

Preferably, described electric isolution transport module includes photoelectric conversion module and electrooptic conversion module, The input of described photoelectric conversion module turns as the input of described electrooptic conversion module, described photoelectricity It is connected by optical fiber between the outfan of die change block and the input of described electrooptic conversion module, described electricity The outfan of light modular converter is as the outfan of described electrooptic conversion module；Described photoelectric conversion module For frequency signal is converted into optical signal, described electrooptic conversion module for being reduced to frequency by optical signal Rate signal.

Preferably, described first voltage signal is 1.58～1:1 with the ratio of described second voltage signal.

Preferably, described active power filtering module is second-order filter module.

Preferably, described active power filtering module filters the cut-off frequency of described sawtooth waveforms noise and is 6kHz～20kHz.

By the above technical scheme that the present invention is contemplated, compared with prior art, it is possible to below acquirement Beneficial effect:

1, whole modules of the high-voltage signal isolation transmission system of the present invention are analog device, it is not necessary to The control chips such as DSP, it is not necessary to programming, the voltage signal that overall process processes is analogue signal, output letter Number can directly act on the CMOS such as comparator and Transistor-Transistor Logic level chip, it is also possible to directly by oscillograph Probe sampling observes directly virtual voltage；

2, the present invention adds bias voltage by voltage bias module to voltage signal, and bias voltage is corresponding Conversion frequency at about 100kHz, by Filtering Processing, voltage to frequency conversion chip can be produced Sawtooth noise filters, and noise attentuation is up to more than 40dB, then removes bias voltage through follow-up, can be by Small-signal well restores, and empirical tests has good reduction effect for the small-signal less than 0.2V； Voltage bias module, active power filtering module and biasing restoration module work between separate, and Electric voltage frequency conversion module, electric isolution transport module and voltage to frequency modular converter with intermediate link Jointly the isolation of high-voltage signal has been coordinated to transmit；

3, the high-voltage signal isolation transmission system of the present invention can realize the real-time Transmission of high voltage analog signal, Empirical tests, the precision of high voltage analog signal transmission is more than 99.5%, and to high voltage analog signal size and ripple Shape is respectively provided with preferable reduction effect, even if when selecting the optical fiber of 100m, signal lag is still below 150 μ s, can isolate the voltage of more than 100kV completely, are much better than and design the height that loaded down with trivial details stability is not enough Pressure linear optical coupling, can meet the isolation transmission requirement of most of high-voltage signal；

4, the high-voltage signal isolation transmission system of the present invention is filtered by active power filtering module, effect Being better than simple RC wave filter, this invention simultaneously isolates transmission plan as a kind of general high-voltage signal, Can be widely applied to electric association area；

5, the high-voltage signal isolation transmission system of the present invention is modularized design, simple in construction, it is simple to work Industryization is produced in enormous quantities.

Accompanying drawing explanation

Fig. 1 is high-voltage signal of the present invention isolation transmission system diagram；

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 representation of the embodiment of the present invention 1；

Fig. 5 is the electric isolution transport module structural representation of the embodiment of the present invention 1；

Fig. 6 is the voltage to frequency modular converter structural representation 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 representation of the embodiment of the present invention 1.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically Embodiment only in order to explain the present invention, is not intended to limit the present invention.

The invention provides a kind of high-voltage signal isolation transmission system, the isolation transmission of described high-voltage signal is System includes that voltage bias module, electric voltage frequency conversion module, electric isolution transport module, voltage to frequency turn Die change block, active power filtering module and biasing restoration module etc., as shown in Figure 1；

The input of described voltage bias module is as the input of described isolation transmission system, outfan Connect the input of described electric voltage frequency conversion module, for the bias voltage that voltage signal is applied, Obtain the first voltage signal and export；The voltage signal of amplitude and the front end input of the bias voltage applied, The conversion ratio of rear end electric voltage frequency conversion module and the cut-off frequency f of active power filtering module₀It is the most relevant, Owing to the conversion ratio of electric voltage frequency conversion module is generally 1V/40KHZ, the cutoff frequency of active power filtering module Rate f₀For 7KHz, accurate in order to ensure that signal transmits, bias voltage needs more than 10 times of f₀× voltage The conversion ratio of frequency translation module, bias voltage needs more than 1.75V；Simultaneously as front end input Voltage signal is 0V～5V, and bias voltage is typically smaller than 5V；

Described voltage bias module includes the first voltage reference cell and biasing presser unit, described the The outfan of one voltage reference cell connects the first input end of described biasing presser unit；Described biasing Second input of presser unit is as the input of described voltage bias module, and described biasing pressurization is single The outfan of unit is as the outfan of described voltage bias module；Described first voltage reference cell is usual Use a voltage reference chip, for providing fluctuation to be less than bias voltage stable for 2mV, to ensure High-voltage signal is through the applying of bias voltage, and follow-up removing, and can keep higher precision, institute State voltage bias module for described bias voltage is put on voltage signal, it is thus achieved that the first voltage signal And export；

The outfan of described electric voltage frequency conversion module connects the input of described electric isolution transport module, For the first voltage signal being converted to frequency signal and exporting；In order to take into account time delay and filter effect, Generally conversion ratio is 1V/20kHz～1V/50kHz, and when taking 1V/20kHz, filter effect is more excellent, when When taking 1V/50kHz, delay effect is more excellent；

Described electric isolution transport module includes photoelectric conversion module and electrooptic conversion module, described electricity every Photoelectric conversion module and electrooptic conversion module is included, described photoelectric conversion module defeated from transport module Entering the end input as described electrooptic conversion module, the outfan of described photoelectric conversion module is with described Connected by optical fiber between the input of electrooptic conversion module, for light will be converted into frequency signal Signal also exports；The outfan of described electrooptic conversion module is as the outfan of described electrooptic conversion module Connect the input of described voltage to frequency modular converter, for optical signal being reduced to frequency signal defeated Go out；Described electric isolution transport module is used for isolating the described frequency signal of transmission；The length of optical fiber then basis Depending on the voltage swing of required transmission, usual optical fiber is the longest, and isolation effect is the best, but the time delay of signal Can be elongated；The electric isolution transport module of the present invention is when selecting the optical fiber of 100m, and signal lag is the least 150 μ s, therefore can isolate the voltage of up to more than 100kV；

The outfan of described voltage to frequency modular converter connects the input of described active power filtering module, uses In described frequency signal being changed into the second voltage signal and exporting, the second voltage signal and the first voltage Signal may be the same or different, and when both are identical, active power filtering module has only to play filter action i.e. Can, when both are different, the second voltage signal can be entered by the difference that both produce by active power filtering module Row amplification is reduced to the first voltage signal, due to conversion ratio and the conversion ratio of electric voltage frequency of voltage to frequency Between differ and not can exceed that 1.58, the ratio of the most usual first voltage signal and described second voltage signal Value is 1.58～1:1；

The outfan of described active power filtering module connects the input of described biasing restoration module, is used for filtering Except the sawtooth waveforms noise in described second voltage signal, amplified simultaneously and be reduced to the first voltage signal And export, (but when the second voltage signal and the first voltage signal are identical, the most only need to filter merely, And need not move through reduction step) described active power filtering module is preferably second-order filter module, its cutoff frequency Rate is arranged can determine according to voltage to frequency convert ratio and the bias voltage applied size, comprehensive on Two, face factor, the scope of cut-off frequency is typically at 6kHz～20kHz, it is possible to achieve sawtooth waveforms noise ten Octave-40dB decays and the impregnable effect of reference wave；

Described biasing restoration module generally includes the second voltage reference cell and biasing removes unit, institute State biasing restoration module and include that the second voltage reference cell and biasing remove unit, described second voltage The outfan of reference cell connects described biasing and removes the first input end of unit；Described biasing removes list Second input of unit is as the input of described biasing restoration module, and described biasing removes the defeated of unit Go out the end outfan as described biasing restoration module；Described second voltage reference cell can use and The voltage reference chip that one voltage reference cell is identical is identical with the first voltage reference cell for providing Stable bias voltage, described biasing remove unit for reduce from described active power filtering module One voltage signal removes bias voltage and exports.

When the front voltage signal demand front end of described high-voltage signal isolation transmission system input is amplified or declines When subtracting, this system can also include that signal normalization module, described signal normalization module are arranged at institute Stating the front end of voltage bias module, its input is as the input of described isolation transmission system, output End connects the input of described voltage bias module, for being adjusted by voltage signal to operation interval defeated Going out, described normalization module is attenuator circuit or amplifying circuit, for being amplified by front voltage signal Or decay to the signal spacing of about 5V～8V.

Embodiment 1

Embodiment 1 high-voltage signal isolation transmission system by signal normalization module, voltage bias module, Electric voltage frequency conversion module, electric isolution transport module, voltage to frequency modular converter, active power filtering module And biasing restoration module is connected in sequence；

Fig. 2 is the signal normalization module of embodiment 1, and this signal normalization module is attenuator circuit, By R₁₁、R₁₂、R₁₃、R₁₄、R₁₅With 15V power supply component IC1 (IC21 in follow up device, IC22, IC6 with IC7 is all identical with IC1 effect) composition；Wherein, R₁₄=R₁₅=R₁₁, Decay at this is mainly for RC potentiometer output low-pressure side letter on 100kV/100V Number (0～100V)；It can be seen that R₁₁The first end and R₁₃The first end and IC1 negative pole altogether, R₁₂The first end and R₁₁Second end connect, as the input of signal normalization module, R₁₂? Two ends connect R₁₃The second end and R₁₄The first end；R₁₁、R₁₂、R₁₃Constitute π type decay electricity Road, here, R₁₁For the input impedance of attenuator circuit input, the attenuation ratio N=10 of attenuator. According to the test result of front end potentiometer, R₁₁Resistance is 100k Ω, according to π type attenuator circuit network Circuit theory:R₁₄Second end connect IC1 Positive pole and R₁₅The first end, IC1 and R₁₅Second end connect, collectively as signal normalizing Change the outfan of module, R₁₄With R₁₅Constitute a voltage follower, make the voltage magnitude after decay not Fluctuating along with the change of output impedance, value makes R again₁₄=R₁₅=R₁₁?.

Fig. 3 is the voltage bias module of embodiment 1, this voltage bias module by voltage reference cell with And biasing presser unit composition, biasing presser unit includes reverse adder and voltage inverter, electricity Pressure reference cell, reverse adder and voltage inverter are sequentially connected with: voltage reference cell is by 5v's Voltage passes through interface 2 and interface 3 to Ref192 voltage reference chip power supply, Ref192 voltage reference core Sheet interface 2 is also associated with the first end of the electric capacity of 10 μ and 0.1 μ of parallel connection, 10 μ in parallel and 0.1 μ The second end ground connection of electric capacity, wherein, the polar capacitor of 10 μ is used for filtering, and makes level more stable, 0.1 μ electric capacity is used for decoupling and eliminating high-frequency noise；The interface 6 of Ref192 voltage reference chip connects equally It is connected to first end of electric capacity of 1 μ and 0.1 μ of parallel connection, and as the outfan of voltage reference cell with anti- Connect to the first input end of adder, 1 μ in parallel and the second end ground connection of the electric capacity of 0.1 μ, 1 μ Polar capacitor be used for guaranteeing that chip output performance is reliable, the electric capacity of 0.1 μ is the most in parallel, is used for improving The transient characterisitics of circuit, obtain the voltage output of high stability；This voltage reference cell output one is high The 2.5V voltage of degree of stability, with input signal V_in2One reacts on amplifier；

Fig. 3 is visible, R₂₂The first end as the second input of described reverse adder, and as institute State voltage bias module input, R₂₁The first end as the first input end of described reverse adder, R₂₂And R₂₁The second end connect the negative pole of IC21 and R₂₃The first end, the plus earth of IC21, Outfan connects R₂₃The second end, and as reverse adder outfan connect voltage inverter defeated Enter end, R₂₁、R₂₂、R₂₃By signal level lifting 2.5V and overturn, input-output equation isR₂₁=R₂₂=R₂₃, thus-V_out21=V_in2+ 2.5, wherein V_in2=V_out1；

R₂₄The first end as the input of voltage inverter, outfan connect IC22 negative pole and R₂₅The first end, the plus earth of IC22, the outfan of IC22 and R₂₅Second end connect, jointly As the outfan of voltage bias module, due to R₂₄=R₂₅, thus realize V_out2=-V_out21=V_in2+ 2.5, The purpose of so far voltage lifting is achieved, and during zero input, output voltage is 2.5V, corresponding conversion frequency Rate is 100kHz, contributes to the signal processing of follow-up filtering link.

Fig. 4 is the voltage to frequency convert module of embodiment 1, and this module have employed selection AD650 chip, Forward input is V-F circuit；The interface 1 of chip and interface 3 and integrating capacitor C_INTParallel connection, interface 2 ground connection, input resistance R_INThe input that the first end is voltage to frequency convert module, R_INBy two The resistance R of series connection₃₁、R₃₂Composition, R_INSecond end connect interface 3, the interface 5 of chip connects 15V The negative pole of voltage source and the first end of the electric capacity of 0.1 μ, the second end ground connection of 0.1 μ electric capacity；Two fixed Time electric capacity C_OSAnd C_OS2The first end altogether, the second end is connected with each other by press button, and C_OS The second end be connected to interface 6；Interface 13 is in parallel with the swept resistance of 20k with interface 14, interface 12 are connected with the first end of the electric capacity of another 0.1 μ, and are simultaneously connected with the negative pole of 15V voltage source, and this connects Mouth is also associated with the first end of 250k resistance, and the second end of 205k resistance connects the swept resistance of 20k Sliding end；Interface 11 connects the second end of the electric capacity of 0.1 μ, is simultaneously connected with simulation ground；Interface 10 is even Connecing digitally, be simultaneously connected with the first end of the electric capacity of 1 μ, two ends of the electric capacity of 1 μ connect 1k resistance First end and the power supply of 5V；Interface 9 connects interface 1, and interface 8 connects the second end of 1k resistance And simultaneously as the outfan of this voltage to frequency convert module

Its major parameter is chosen as follows: I_IN=V_IN3/R_IN；t_OS=C_OS×6.8×10³sec/F+3.0×10^-7s。

$\mathrm{\&Delta;}V=t_{OS}\frac{dV}{dt}=\frac{t_{OS}}{C_{INT}}(1mA-I_{IN})$

$T1=\mathrm{\&Delta;}V\frac{dt}{dV}=\frac{t_{OS}}{C_{INT}}(1mA-I_{IN})\&times;\frac{C_{INT}}{I_{IN}}=t_{OS}\&times;(1mA-I_{IN})$

$f_{out3}=\frac{1}{t_{OS+}T1}=0.15\frac{V_{in3}}{R_{IN}(C_{OS}+4.4\&times;{10}^{-11}F)},V_{in3}=V_{out2};$

In the voltage to frequency convert module of this embodiment, it is only necessary to determine four outward elements, i.e. input Resistance R_IN, timing capacitor C_OS, logic resistance (i.e. the 1k resistance being connected with 5V voltage in Fig. 4), Integrating capacitor C_INT.Wherein logic resistance is as pull-up resistor, should make V-F chip internal transistor electricity Stream is less than 8mA, and as selected 5V logic power, logic resistance should be not less than 5V/8mA=625 Ω. R_INAnd C_OSDetermine full scale frequency and input voltage range, also determine the size of nonlinearity simultaneously, It is, in general, that C_OSThe biggest, the least (R of input current_INThe biggest), non-linear the least.Integrating capacitor C_INT Only determining the height of reset cycle voltage, its reference value is chosen as the following formula: Based on above reckoning, major parameter selects: C_OSSelect 100pF electric capacity, now input resistance R_IN Size have employed 10k Ω resistance and 20k Ω resistance string in 26k about Ω, preferably this circuit design Connection mode, facilitates resistance to regulate, C_INTSelect 1000pF electric capacity, R_INSelect 1k Ω resistance, conversion Ratio is 1V/40kHz.

Fig. 5 is the electric isolution transport module of embodiment 1, and this electric isolution transport module is turned by electric light (E/O) Die change block and photoelectricity (O/E) modular converter composition: successively by logic gate device 75451, HFBR1414 Combined chip, ST interface 62.5/125 μm multimode fibre and HFBR2412 combined chip connect composition； Logic gate device 75451 receives f_outFrequency signal, and export a level signal, this signal enters to be sent out Optical diode integration module HFBR1414, becomes by the conversion of low and high level into the light on and off of diode, passes through Optical fiber is by high-frequency frequencies of light signal (conversion of high frequency light on and off counterlogic level " high " " low "), right High frequency light signal is demodulated to frequency signal by the fiber optic receiver HFBR2412 of side, and required for us Demodulation voltage out and frequency are linearly ratios, and the isolation thus achieving voltage signal passes Defeated, it is contemplated that electric isolution transport module is for the collection control of Electron Cyclotron Resonance Heating system-related signal The actual requirement of system, We conducted E/O modular converter and the simulation experiment of O/E modular converter, Simulation experiment is chosen 20m Yu 100m length of fibre.Test result represents, with 20m and 100m Optical fiber connect time, the time delay of E/O modular converter and O/E modular converter be respectively smaller than 200ns and 600ns, the 400ns time delay of difference is the time delay that light produces at 80m spread fiber, input 1MHz's Errorless the restoring of energy of square wave, triangular wave, sine wave signal, VF and the FV part that compares is produced Raw time delay, this part time delay even can ignore, and comprehensive descision, this electric isolution transport module be enough to Meet system requirements.

Fig. 6 is the voltage to frequency modular converter of embodiment 1, its structure and the voltage to frequency convert of Fig. 4 Module is similar to；Wherein, the annexation of interface 5,6,11,12,14 all with voltage to frequency convert mould Block is identical；First end of electric capacity 560pF is as the input of signal, and the second end connects 500 Ω resistance First end, the second end of 500 resistance connects interface 9 and first end of diode IN914, diode Second end connect digitally；Interface 9 the most also passes sequentially through the resistance of 2k and 500 Ω and is connected to The power supply of 5V, interface 8 is connected with the intermediate connections of 2k and the resistance of 500 Ω；Interface 10 with Interface 11 connects；Interface 2 ground connection, and it is parallel with input resistance R on interface 1 and interface 3 simultaneously_IN With integrating capacitor C_INT, integrating capacitor C_INTResistance R by two series connection₅₁、R₅₂Composition, interface 1 Outfan as this voltage to frequency modular converter.

Owing to being to select AD650 chip equally, chip characteristics is consistent, simply with V/F part with principle One contrary transformation process, therefore major parameter selects as follows: C_OSSelect 100pF electric capacity, now Input resistance R_INSize have employed in 26k about Ω, preferably this circuit design 10k Ω resistance with 20k Ω resistant series mode, facilitates resistance to regulate.C_INTSelect 1000pF electric capacity, R_INSelect 1k Ω Resistance, changes ratio into 40kHz/1V.

Fig. 7 is the active power filtering module of embodiment 1, R₆₁The first end as this active power filtering module Input, R₆₁Second end connect electric capacity C₆₁And R₆₂The first end, R₆₂Second end connect IC6 Positive pole and electric capacity C₆₂The first end；The negative pole of IC6 connects R and R_fThe first end, the of R Two ends and electric capacity C₆₂The second end altogether, electric capacity C₆₁The second end and IC6 outfan collectively as The outfan of active power filtering module: in order to simplify design, make R in the present invention₆₁=R₆₂=10k Ω, C₆₁=C₆₂=2.2nF, then corresponding cut-off frequencyF is set₀For about 7.2kHz, right Answer 100kHz, more than ten octaves, sawtooth waveforms decay-45.6dB.Filtering parameter can also be adjusted make f₀=10kHz, now sawtooth waveforms decays to 1% original (-40dB).R and R in loop_fCan be Signal and then secondary are amplified by filtering simultaneously, can compensate the amplitude of V-F and F-V module, put Big coefficient A_V=(R+R_f)/R, it should be noted thatOtherwise in signal processing There will be overshoot, be unfavorable for the realization of systemic-function.Due to sawtooth waveforms just along with reference signal amplitude Increasing and reduce, preferably in this programme designs, sawtooth waveforms is less than 50mV, therefore at active power filtering Afterwards, spuious sawtooth waveforms can be ignored, and so removes processing of circuit through final bias voltage, Output signal and original signal just can be accomplished highly consistent, and precision is higher than 99.5%.And measurement apparatus itself Error is the most all between 0.5%～1%, so the present invention designs can meet most signal-isolated transmission Requirement.

Fig. 8 is the biasing restoration module of the present invention, voltage reference cell and biasing remove unit group Becoming, voltage reference cell is identical with the voltage reference cell in voltage bias module, still uses Ref192 voltage reference chip, reduces 2.5V by signal level；

R₇₂The first end as biasing remove unit the second input and biasing restoration module defeated Enter end, for the voltage signal V of input front end_in7, V_in7=V_out6；R₇₁, R₇₂Outfan connect IC7 Positive pole and R₇₃Input；R₇₁The first end remove the first input end of unit as biasing, Connect the outfan of voltage reference cell, R₇₁The second end connect the positive pole of IC7 and R₇₄First End；R₇₃The second end ground connection, the outfan of IC7 and R₇₄The second end remove unit as biasing And the outfan of biasing restoration module；

Based on operational amplifier, the resistance R in figure₇₁、R₇₂、R₇₃、R₇₄Together form one and ask poor Circuit, by simply calculating, R₇₁=R₇₂=R₇₃=R₇₄, finally draw V_out7=V_in7-2.5.This biasing restoration module is by above Filtering Processing After signal blood pressure lowering again, this completes lifting level removes work, as shown in Figure 7.

In summary it can be seen: the high-voltage signal isolation transmission system of the present invention can realize the real-time of signal Isolation transmission, low cost, time delay is short, and precision is high, and isolation voltage is more than 100kV, ensures through electronics Each analog acquisition signal of cyclotron resonance heating input can effectively enter controller in real time, controls simultaneously The order of device also can effectively be transmitted to high voltage control end, and design show is outstanding.

As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc. With replacement and improvement etc., should be included within the scope of the present invention.

Claims (10)

1. a high-voltage signal isolation transmission system, it is characterised in that include voltage bias module, electricity Voltage-frequency rate conversion module, electric isolution transport module, voltage to frequency modular converter, active power filtering module with And biasing restoration module；

The outfan of described voltage bias module connects the input of described electric voltage frequency conversion module, institute The outfan stating electric voltage frequency conversion module connects the input of described electric isolution transport module, described electricity The outfan of isolated transmission module connects the input of described voltage to frequency modular converter, described frequency electricity The outfan of pressure modular converter connects the input of described active power filtering module, described active power filtering module Outfan connect the input of described biasing restoration module, the outfan of described biasing restoration module is made Outfan for described isolation transmission system；

Described voltage bias module is for applying bias voltage to input signal, it is thus achieved that the first voltage signal； Described electric voltage frequency conversion module for being converted to frequency signal, described electric isolution by the first voltage signal Transport module is used for isolating the described frequency signal of transmission, and described voltage to frequency modular converter is for by described Frequency signal is converted to the second voltage signal, and described active power filtering module is used for filtering described second voltage Sawtooth waveforms noise in signal, is reduced to the first voltage signal；Described biasing restoration module is used for From the first voltage signal of described active power filtering module reduction, remove bias voltage, complete described high pressure The isolation transmission of signal.

2. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described partially The size putting voltage is 1.75V～5V.

3. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described height Pressure signal-isolated transmission system also includes signal normalization module, the input of described signal normalization module Holding the input as described isolation transmission system, outfan connects the input of described voltage bias module End, described signal normalization module is for adjusting input signal to operation interval and exporting.

4. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described electricity Pressure biasing module includes the first voltage reference cell and biasing presser unit, described first voltage reference The outfan of unit connects the first input end of described biasing presser unit, described biasing presser unit The second input as the input of described voltage bias module, outfan is as described voltage bias The outfan of module；Described first voltage reference cell is used for providing stable bias voltage；Described partially Put presser unit for described bias voltage is put on voltage signal, it is thus achieved that the first voltage signal.

5. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described partially Put restoration module and include that the second voltage reference cell and biasing remove unit, described second voltage reference The outfan of unit connects described biasing and removes the first input end of unit, and described biasing removes unit Second input removes the outfan of unit as the input of described biasing restoration module, described biasing Outfan as described biasing restoration module；Described second voltage reference cell is for providing stable Bias voltage；Described biasing removes unit for the first voltage letter reduced from described active power filtering module Bias voltage is removed in number.

6. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described electricity The conversion ratio that described first voltage signal is converted to frequency signal is by voltage-frequency rate conversion module 1V/20kHz～1V/50kHz.

7. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described electricity Isolated transmission module includes photoelectric conversion module and electrooptic conversion module, described photoelectric conversion module Input is as the input of described electrooptic conversion module, the outfan of described photoelectric conversion module and institute State and connected by optical fiber between the input of electrooptic conversion module, the outfan of described electrooptic conversion module Outfan as described electrooptic conversion module.

8. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described the One voltage signal is 1.58:1～1:1 with the ratio of described second voltage signal.

9. high-voltage signal isolation transmission system as claimed in claim 1, it is characterised in that described in have Source filtration module is second-order filter module.

10. high-voltage signal isolation transmission system as claimed in claim 9, it is characterised in that described It is 6kHz～20kHz that active power filtering module filters the cut-off frequency of described sawtooth waveforms noise.