CN105141266A - Photoelectric isolation amplifier of analogue signals - Google Patents
Photoelectric isolation amplifier of analogue signals Download PDFInfo
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- CN105141266A CN105141266A CN201510461330.5A CN201510461330A CN105141266A CN 105141266 A CN105141266 A CN 105141266A CN 201510461330 A CN201510461330 A CN 201510461330A CN 105141266 A CN105141266 A CN 105141266A
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Abstract
The invention discloses a photoelectric isolation amplifier of analogue signals. The photoelectric isolation amplifier comprises an isolation input unit, an optical coupling isolation unit and an isolation output unit; the first input end of the isolation input unit is used as the signal input interface of the photoelectric isolation amplifier of the analogue signals; the second input end of the isolation input unit is connected to the first output end of the optical coupling isolation unit; the first input end of the optical coupling isolation unit is connected to the output end of the isolation input unit; the input end of the isolation output unit is connected to the second output end of the optical coupling isolation unit; and the output end of the isolation output unit is used as the signal output interface of the photoelectric isolation amplifier of the analogue signals. The isolation input unit and the isolation output unit are respectively powered; and, after being isolated through the photoelectric isolation amplifier of the analogue signals, amplified and filtered, the analogue signals are output in small distortion in a range that the linear error is less than 1%.
Description
Technical field
The invention belongs to analog signal isolating circuit engineering field, more specifically, relate to a kind of analog signal optical isolation amplifier.
Background technology
Analog signal isolating circuit is mainly used in obtaining signal from the environment of forceful electric power, is widely used in the fields such as process control, biology pertinent instruments, data acquisition system, computer measurement control system; In computer measurement control system, the signal in the external world and computer itself are isolated, certain degree ensures the safety of computer and to a certain degree improves program operational reliability; By cutting off earth-return, prevent issuable ground circulation on the impact of signal; Be applied to medical instrument, ensure personal safety; In acquisition system, the acquisition instrument equipment such as capture card can be protected.
Existing buffer circuit mainly contains light-coupled isolation, transformer coupled isolation and capacitive coupling and isolates three kinds; Transformer coupled isolation uses transformer coil to come signal transmission and energy, without the need to independent power supply, but be easily subject to extraneous electromagnetic signals interference, and volume is larger.Capacitive coupling isolation uses the electric field of constantly change to carry out signal transmission, needs noise and signal to share a path, requires that signal frequency is far above interference signal frequency; Light-coupled isolation is media transmission signal by luminescent device and light-sensitive device with light, has the advantages such as one-way transmission signal, antijamming capability is strong, long service life is contactless, under being applicable to being applied to the condition of electromagnetic environment more complicated.
Often there is complicated subsystem in large-scale experimental device, each subsystem Grounding is complicated, and each subsystem may exist complicated analog signal, and corresponding signals collecting rate is also different, for the subsystem that acquisition rate is higher, a isolated amplifier is very important; The unit additionally added in systems in which, should be as far as possible little on the impact of system, so the isolated amplifier added not only needs bandwidth comparatively large, and the linearity will be got well, and need the analog signal and the direct current signal that are applicable to various complexity, require, to different systems, there is versatility; Existing optical coupling isolation circuit cannot meet the demand simultaneously, and neither be that complex electromagnetic environment is custom-designed, the stability of a system be not high simultaneously.
Summary of the invention
For existing technological deficiency or technical need, the invention provides a kind of analog signal optical isolation amplifier, bandwidth can reach 2.7MMHz, and object is to solve that existing optical coupling isolation circuit bandwidth is low, the problem of poor linearity.
Analog signal optical isolation amplifier provided by the invention, comprises Isolation input unit, light-coupled isolation unit and isolation and amplifier unit; The first input end of Isolation input unit, as the signal input interface of analog signal optical isolation amplifier, receives external analog signal; Second input connects the first output of light-coupled isolation unit, receives the second current signal; The voltage analog signal that Isolation input unit is used for outside inputs is transformed into the first current signal, obtains drive singal according to described first current signal; And according to described second current signal, DC error compensation is carried out to signal input interface;
The first input end of light-coupled isolation unit connects the output of Isolation input unit; Light-coupled isolation unit is used for carrying out electro-optic conversion according to above-mentioned drive singal, obtains light signal, then converts this light signal to the signal of telecommunication; The isolation to the voltage analog signal that Isolation input unit (11) inputs is realized by electro-optic conversion and opto-electronic conversion;
The input of isolation and amplifier unit connects the second output of light-coupled isolation unit, and receive the 3rd current signal, output is as the signal output interface of analog signal optical isolation amplifier; Isolation and amplifier unit is used for the 3rd current signal being transformed into voltage signal and amplifying and filtering voltage signal, realizes gain-adjusted and bandwidth broadning; Bandwidth can reach 2.7MHz;
The analog signal of outside access, through the isolation of analog signal optical isolation amplifier and the amplification of signal and filtering conditioning, is less than little distortion in 1% scope in linearity error and exports.
Preferably, Isolation input unit comprises voltage conversion circuit, LED drive circuit and feedback circuit; Voltage conversion circuit first input end is as the first input end of Isolation input unit, and the second input connects the output of feedback circuit; Power input is as the power interface of Isolation input unit; The input of LED drive circuit connects the output of voltage conversion circuit, the output of LED drive circuit as Isolation input unit output, for being connected with light-coupled isolation unit; The input of feedback circuit as the second input of Isolation input unit, for connecting light-coupled isolation unit; The analog voltage signal that voltage conversion circuit is used for outside inputs is converted to the first current signal; LED drive circuit is used for generating drive singal according to the first current signal, carries out electro-optic conversion to drive light-coupled isolation unit;
Feedback circuit is used for carrying out amplification process to the second current signal, and output feedback signal, voltage conversion circuit carries out DC error compensation according to this feedback signal to signal input interface.
Preferably, voltage conversion circuit comprises the first constant-current source, the first resistance and the second resistance; First constant-current source anode is as the power input of voltage conversion circuit; ; The first end of the first resistance is as voltage conversion circuit first input end, and the second resistance first end is connected with the second end of the first resistance, its link also with the stable node O of the first constant-current source
1connect, and as the output of voltage conversion circuit; Second end of the second resistance is as the second input of voltage conversion circuit; The external voltage analog signal of access, by the first resistance, is converted to current signal by voltage conversion circuit.
Preferably, LED drive circuit comprises the first operational amplifier, the 4th resistance and triode; The positive termination Isolation input of input of the first operational amplifier is with reference to ground, and input negative terminal is as the input of LED drive circuit; Transistor base connects the output of the first operational amplifier, and emitter is connected with power supply by the 4th resistance, and collector electrode is as the output of LED drive circuit.
Preferably, feedback circuit comprises the second operational amplifier and the 3rd resistance; The input anode of the second operational amplifier connects Isolation input with reference to ground, and input negative terminal, as the input of feedback circuit, connects the first output of light-coupled isolation unit; The first end of the 3rd resistance connects the input negative terminal of the second operational amplifier; Second end of the 3rd resistance connects the output of the second operational amplifier, and its link is as the output of feedback circuit;
The current signal that light-coupled isolation unit provides is formed summing junction by operational amplifier by feedback circuit, then is superposed with constant-current source by the current signal after summation, acts on the input of Isolation input unit, with compensating circuit DC error.
Preferably, light-coupled isolation unit is made up of an optical coupling module, this optical coupling module has 6 ports, first port connects Isolation input with reference to ground, second port is as the input of light-coupled isolation unit, 3rd port, as the negative terminal of light-coupled isolation unit first output, is connected with the input anode of described second operational amplifier; 4th port, as the anode of light-coupled isolation unit first output, is connected with the input negative terminal of the second operational amplifier in above-mentioned feedback circuit; Five-port is as the negative terminal of light-coupled isolation unit second output; 6th port is as the anode of the second output of light-coupled isolation unit;
Above-mentioned optical coupling module comprises two photodiodes; The anode of the first photodiode is as the 3rd port of optical coupling module, and negative terminal is as the 4th port of optical coupling module; The anode of the second photodiode is as the 6th port of optical coupling module, and negative terminal is as the five-port of optical coupling module; First photodiode is used for transferring light signal to second current signal; Second photodiode is used for transferring described light signal to the 3rd current signal;
The input electrical signal that optical coupling module is used for the input unit of self-isolation in the future LED drive circuit transistor collector is converted into light signal; Again light signal is converted into the signal of telecommunication, and this signal of telecommunication is delivered to respectively Isolation input unit feedback circuit and isolation and amplifier cell current change-over circuit; Signal one-way transmission, input and the complete electrical isolation of output, output signal on input without impact, have very strong antijamming capability.
Preferably, isolation and amplifier unit comprises current converter circuit and amplifying circuit, and the input of current converter circuit is as the input of isolation and amplifier unit, and power input is as the power interface of isolation and amplifier unit; The input of amplifying circuit connects current converter circuit output; The output of amplifying circuit is as the output of isolation and amplifier unit; Current converter circuit is used for the 3rd current signal being converted to voltage signal, the gain of amplifying circuit for regulating current converter circuit to output signal.
Preferably, current converter circuit comprises the second constant-current source, the 5th resistance, the first electric capacity and the 3rd operational amplifier;
Wherein, the second constant-current source is just as current converter circuit power input; First electric capacity and the 5th resistor coupled in parallel, its first parallel connected end connects the stable node O of the second constant-current source
2; Second parallel connected end connects the output of the 3rd operational amplifier, and its tie point is as the output of current converter circuit; First electric capacity value between 0.8pF to 1.0pF;
The input negative terminal of the 3rd operational amplifier, as the negative terminal of isolation and amplifier unit input, inputs the anode of anode as isolation and amplifier unit input, and connects isolation and amplifier with reference to ground;
First electric capacity is attempted by the 5th resistance for eliminating circuit resonance; Second constant-current source is for eliminating the DC error of circuit; 3rd operational amplifier is used for carrying out amplification process to signal, with the first electric capacity, the 5th resistance, the second constant-current source acting in conjunction, expands the bandwidth of current converter circuit; First electric capacity value between 0.8pF to 1.0pF, the 5th resistance gets 20k Ω, reaches maximum bandwidth.
Preferably, amplifying circuit comprises four-operational amplifier, the 6th resistance and the 7th resistance; Four-operational amplifier input anode, as the input of amplifying circuit, connects the output of current converter circuit; Input negative terminal connects isolation and amplifier ground by the 6th resistance; 7th resistance one end is connected to the input negative terminal of four-operational amplifier; The other end is connected with the output of four-operational amplifier, and its tie point is as the output of amplifying circuit; Amplifying circuit, by the 6th resistance resistance and the 7th resistance, realizes the maximization of transfer function gain, reduces linearity error.
Preferably, above-mentioned analog signal optical isolation amplifier, also comprises power supply; Power supply comprises the first power supply branch road and the second power supply branch road; Wherein, the first power supply branch road comprises the first transformer, the first rectifier bridge, the first pressurizer and the second pressurizer and the first filter capacitor;
The input of the first transformer is used for connecing 220V civil power, the first rectifier bridge input termination first transformer output;
Described first pressurizer is in parallel with the second pressurizer, and the first filter capacitor is connected across its first parallel connected end, forms the first voltage stabilizing circuit; Input termination first rectification bridge output end of the first voltage stabilizing circuit, output then as the first power supply branch road output, for Isolation input unit is powered;
Second power supply branch road comprises the second transformer, the second rectifier bridge, the 3rd pressurizer and the 4th pressurizer and the second filter capacitor;
The input of the second transformer is used for connecing 220V civil power, and the second rectifier bridge input connects the second transformer output;
3rd pressurizer is in parallel with the 4th pressurizer, and the second filter capacitor is connected across its first parallel connected end, forms the second voltage stabilizing circuit; Second voltage stabilizing circuit input connects the second rectification bridge output end, output then as the second power supply branch road output, for isolation and amplifier unit is powered;
First power supply branch road and second voltage magnitude that branch road provides of powering is equal, be respectively Isolation input unit and isolation and amplifier unit is powered, realize Isolation input unit and the isolation of isolation and amplifier unit on powering, and the isolation between input analog signal transmission passage and power supply.
Analog signal optical isolation amplifier provided by the invention, the feedback circuit in its Isolation input unit realizes be combineding with each other of high bandwidth and high linearity; LED luminosity in optical coupling module is directly proportional to electric current, when electric current increase to cause junction temperature to raise time, LED is saturated, is no longer operated in linear zone, and therefore usually optocoupler circuit linearity degree is poor; By combinationally using the two-way photodiode of optocoupler in the present invention, signal transmission is carried out on a road, and feedback compensation is carried out on another road, makes LED be in unsaturated state always, is operated in linear zone, improves the linearity of isolated amplifier; In current converter circuit, the first capacitance is between 0.8pF to 1.0pF, and by leading phase compensation, offsetting light-coupled isolation unit affects the wideband noise of circuit characteristic, improves the bandwidth of integrated circuit; The isolation to strong electromagnetic is achieved by the mutual conversion in light-coupled isolation unit between light and the signal of telecommunication.
Preferably, all elements of above-mentioned analog signal optical isolation amplifier are integrated on one piece of circuit board.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) analog signal optical isolation amplifier provided by the invention, utilizes the output of optocoupler Zhong mono-road photodiode to make feedback compensation; And by adjustment first capacitor's capacity, realize the adjustment to circuit bandwidth, maximum bandwidth can reach 2.7MHz, is applicable to the process of Low Medium Frequency analog signal isolating;
Add the phase shift of circuit due to the inner complex capacitance of photodiode and amplifier and cause the instability of photodiode signal testing circuit, vibration may be produced under the interference of wideband noise, the present invention is by the first electric capacity and the 5th resistance, realize leading phase compensation, counteracting photodiode and the inner complex capacitance of operational amplifier are on the impact of circuit;
Because the first capacitance is larger, circuit closed loop amplitude-versus-frequency curve flatness is better, but circuit bandwidth also declines to some extent; By choosing the first suitable capacitance capacitance and the 5th resistance, can, when circuit closed loop amplitude-versus-frequency curve flatness the best, circuit be made to reach 2.7MHz bandwidth;
(2) analog signal optical isolation amplifier provided by the invention, combinationally use the two-way photodiode of optical coupling module, a wherein road photodiode is utilized to carry out signal transmission, wherein another road photodiode is utilized to carry out feedback compensation, make LED light-emitting diode be in unsaturated state always, be operated in linear zone, improve the linearity of analog signal optical isolation amplifier;
(3) analog signal optical isolation amplifier provided by the invention, realize amplifying conditioning and gain-adjusted by amplifying circuit in isolation and amplifier unit, consider the gain of overall circuit transfer function, in isolation and amplifier unit amplifying circuit, by adjusting the 6th resistance and the 7th resistance, making integrated circuit be less than little distortion in 1% scope to the outside linear error of input analog signal and exporting;
(4) analog signal optical isolation amplifier provided by the invention, adopts high speed photo coupling isolation module, by transmission time delays time to control within 150ns, can meet the demand that the follow-up analog signal exported by this amplifier is used as control signal.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of the broadband analog signal optical isolation amplifier that the embodiment of the present invention provides;
Fig. 2 is the structural representation of isolating power supply in the broadband analog signal optical isolation amplifier that provides of the embodiment of the present invention;
Fig. 3 is the Isolation input cell schematics that the embodiment of the present invention provides;
Fig. 4 is the isolation and amplifier cell schematics that the embodiment of the present invention provides;
Fig. 5 is the broadband analog signal optical isolation amplifier vertical view that the embodiment of the present invention provides;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
Power branch road, 3-second of 1-analog signal optical isolation amplifier, 2-first powers branch road, 11-Isolation input unit, 111-voltage conversion circuit, 112-LED drive circuit, 113-feedback circuit, 12-light-coupled isolation, 13-isolation and amplifier unit, 131-current converter circuit, 132-amplifying circuit, 4-cabinet bottom panel, 5-power supply product word wire inserting slot installing hole, 6-mains switch installing hole, 7-signal isolation circuit installation site; 8-signal input connector installing hole; 9-signal output connecting head installing hole;
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, analog signal optical isolation amplifier provided by the invention comprises Isolation input unit 11, light-coupled isolation unit 12, isolation and amplifier unit 13 and the first insulating power supply 2 and the second insulating power supply 3;
The first input end of Isolation input unit 11 is as the signal input interface of analog signal optical isolation amplifier, and the second input connects the first output of light-coupled isolation unit, and power interface connects the output of the first insulating power supply 2;
The first input end of light-coupled isolation unit 12 connects the output of Isolation input unit 11; The input of isolation and amplifier unit 13 connects the second output of light-coupled isolation unit 12, and output is as the signal output interface of analog signal optical isolation amplifier, and power interface connects the output of the second insulating power supply 3.
The analog voltage signal of input is carried out the conversion of voltage to electric current by Isolation input unit, obtains current signal; Under LED drive circuit effect, after being isolated by light-coupled isolation unit by this current signal, current signal carries out the conversion of electric current to voltage via isolation and amplifier unit, obtains voltage signal, and linear convergent rate.
Isolation input unit 11 comprises voltage conversion circuit 111, LED drive circuit 112 and feedback circuit 113; The first input end of voltage conversion circuit 111 is as the first input end of Isolation input unit 11, for receiving external analog signal, second input connects the output of feedback circuit 113, and the constant-current source anode of voltage conversion circuit 111 is as the power interface of Isolation input unit 11; LED drives the input on electric 112 tunnels to connect the output of voltage conversion circuit 111, the output of LED drive circuit 112 as Isolation input unit 11 output, for being connected with light-coupled isolation unit 12; The input of feedback circuit as the second input of Isolation input unit, for connecting light-coupled isolation unit 12;
In embodiment, light-coupled isolation unit 12 adopts the optocoupler with two photodiodes, and the first photodiode is used for feedback circuit 113 signal feedback, and the second photodiode is for exporting isolation signals;
Input signal is converted to current signal through voltage conversion circuit 111, and LED drive circuit 112 pairs of current signals control, and drives the LED of light-coupled isolation unit 12 luminous; Feedback circuit 113 obtains current signal from the first output of optical coupling module and is converted to voltage signal; Feed back to the compensation that voltage conversion circuit 111 realizes the inherent nonlinearity degree to optocoupler.
Isolation and amplifier unit 13 comprises current converter circuit 131 and amplifying circuit 132; Current converter circuit 131 optocoupler output current signal is transferred to voltage signal export, amplifying circuit 132 to input analog signal isolating after linearity error lower than 1% linear convergent rate; The insulating power supply module with two power supply branch roads is respectively Isolation input unit and isolation and amplifier unit is powered, and realizes the independence of power supply and signal.
In embodiment, independently insulating power supply is adopted to power to light-coupled isolation unit 12 both sides respectively; In order to realize the isolation of external input signal transmission channel and power supply module, the first branch road 2 and second branch road 3 of powering of powering is adopted to separate and power at input unit and the output unit of signal isolation circuit; As shown in Figure 2, isolated location power supply comprises the first power supply branch road 2 and the second power supply branch road 3, two cover power supply has identical modular structure, includes transformer, rectifier bridge, electric capacity and two pressurizers;
Civil power is through transformer pressure-reducing, through rectifier bridge rectification, and obtain the voltage range needed for pressurizer, voltage stabilization is fixed voltage by pressurizer, and each road power supply is all symmetrical exports identical generating positive and negative voltage to circuit supply; Insulating power supply is integrated in signal isolation circuit, simple and practical, and realizes modularization, saves the space of pcb board; Two-way insulating power supply is linear power supply, and working condition is stablized, the interference that ripple is less does not have Switching Power Supply to have and noise.
In embodiment, optocoupler is adopted to make isolating device; The usual optocoupler linearity is poor, and in an embodiment, is fed back by Isolation input unit sampling, realizes the compensation to optocoupler luminous flux, the electric current that photodiode in optical coupling module is produced and the luminous flux of LED linear.
As shown in Figure 3, the Isolation input unit 11 of embodiment specifically comprises the first operational amplifier U
1, the second operational amplifier U
2, constant-current source I
1, triode Q, the first resistance R
1, the second resistance R
2, electric three resistance R
3with the 4th resistance R
4;
Outside input analog signal is by the first resistance R
1be converted to current signal and input the first operational amplifier U
1input negative terminal, constant-current source I
1one termination power supply signal VCC
1, the other end confluxes to the first operational amplifier U
1input negative terminal; First operational amplifier U
1input anode is connected to the second operational amplifier U
2input anode, and be connected to the ground end of insulating power supply 2; The base stage of triode Q is connected to the first operational amplifier U
1output, emitter is by the 4th resistance R
4be connected to power supply VCC
1, collector electrode is connected to optocoupler LED and inputs anode; Second operational amplifier U
2input negative terminal connects two paths of signals, and a road is connected to optocoupler first photodiode anode, separately leads up to the 3rd resistance R
3be connected to output; Second operational amplifier U
2input anode connects the optocoupler first photodiode other end; Second operational amplifier U
2output superposition the 3rd resistance R
3the voltage signal of feedback is by the second resistance R
2be connected to the first operational amplifier U
1input negative terminal.
As one embodiment of the present of invention, realize constant-current source function by source of stable pressure series resistor, by the pressurizer stable node voltage of source of stable pressure inside, the resistance of this serial connection obtains constant voltage and namely forms constant current; Constant-current source I
1the input negative terminal being connected to the first operational amplifier provides quiescent point to circuit; Triode Q receives the electric current of the first operational amplifier U1 output and is amplified by this current signal, to drive optocoupler LED luminous; Second operational amplifier receives the current signal of optocoupler first photodiode, feeds back to the first operational amplifier input negative terminal by the second resistance R2; Wherein, when ac input signal is zero, circuit is in DC operation state, and current/voltage is one and determines a little, claims quiescent point;
After analog signal access, at Isolation input unit through the first resistance R
1this analog voltage signal is converted to current signal; Constant-current source I
1make the work of circuit energy bipolarity to circuit presets quiescent point, and eliminate static receiver error; Current signal is at the first operational amplifier U
1place carries out suing for peace and is then transferred to triode Q, and triode Q amplified current signal drives the LED in optocoupler luminous, and the luminous flux that driving LED luminescence produces is converted to current signal, the second operational amplifier U by the first photodiode PD Received signal strength in optocoupler
2receive this signal of telecommunication and transfer voltage signal to, by the second resistance R
2be converted to current signal and feed back to the first operational amplifier U
1input negative terminal, completes Isolation input unit feedback compensation process.
As shown in Figure 4, the isolation and amplifier unit 13 of embodiment specifically comprises the 3rd operational amplifier U
3, four-operational amplifier U
4, constant-current source I
2, electric capacity C
1, the 5th resistance R
5, the 6th resistance R
6with the 7th resistance R
7; Second photodiode cathode, constant-current source I in light-coupled isolation unit
2anode and electric capacity C
1with resistance R
5parallel connection, the first parallel connected end and the 3rd operational amplifier U
3input negative terminal connects, the second parallel connected end and the 3rd operational amplifier U
3output connect; 3rd operational amplifier U
3input anode connects the second photodiode anode, and it connects the ground of termination insulating power supply 3; 3rd operational amplifier U
3export termination four-operational amplifier U
4input anode, four-operational amplifier U
4input negative terminal by the 7th resistance R
7ground connection, U
4output by the 6th resistance R
6be connected to U
4input negative terminal, form proportional amplifier in the same way;
In embodiment, the first electric capacity value between 0.8pF to 1.0pF, the 5th resistance 20k Ω, current converter circuit is maximum reaches 2.7MHz bandwidth; Amplifying circuit achieves gain-adjusted, and by the calculating of the transfer function gain to entirety, choose the 6th resistance 91k Ω, the 7th resistance 10k Ω, realizes gain-adjusted, make linearity error be less than 1%.
In embodiment, constant-current source I
2for regulating circuit DC error, reduce circuit drift; The light signal that optocoupler LED sends is converted into the signal of telecommunication by optocoupler second photodiode; The current signal that described photodiode gathers is converted into voltage signal by I-V change-over circuit, and by the gain of amplifying circuit regulating circuit, the current converter circuit of isolation and amplifier unit and amplifying circuit act synergistically the bandwidth to increase analog signal optical isolation amplifier, realize for multi-signal little distortion isolation transmission.
In embodiment, the connector adopting Q9 head input as external analog signal and the connector of signal isolation and amplifier, connect simply, have good versatility.
The signal isolation circuit that example provides realizes linear isolation to signal, be applied to large-scale experiment device, effectively can solve the ground circulation interference between large-scale experiment device subsystem caused by interrelated wiring, electromagnetic interference in masked segment complex electromagnetic environment, has stronger common mode inhibition capacity.
The analog signal optical isolation amplifier that embodiment provides, go for the analog signal isolating little distortion linear transfer of frequency up to 2.7MHz, the transmission time, time delay was within 150ns, was applicable to Low Medium Frequency analog signal; The analog signal optical isolation amplifier that embodiment provides can be used for J-TEXT tokamak device, for shielding ground circulation interference mutual between each subsystem of tokamak device, and plays shielding action to complex electromagnetic environment interference.
Analog signal optical isolation amplifier provided by the invention, accessible site is on one piece of circuit board; Embodiment still provides a kind of cabinet for placing analog signal optical isolation amplifier circuit board provided by the invention; The vertical view of analog signal optical isolation amplifier circuit board shown in Fig. 5: 4 is cabinet bottom panel; 5 is power supply product word wire inserting slot installing hole; 6 is mains switch installing hole; 7 is analog signal optical isolation amplifier PCB; 8 is signal input connector installing hole; 9 is signal output connecting head installing hole; In figure, small sircle hole is installing hole; The present invention adopts civil power as externally fed, and analog signal optical isolation amplifier of the present invention is at cabinet left surface supply hub place, and namely in Fig. 5, power supply wiring slot is installed at 2 places, realizes namely inserting plug and play; Mains switch selects " ship type " switch with charged prompting, prompting cabinet working condition; Analog signal optical isolation amplifier circuit board is fixed on bottom cabinet by 4 hexagonal copper posts.
Analog signal optical isolation amplifier provided by the present invention also can be used in other systems needing high frequency signal to isolate, and is not limited only to system listed by the embodiment of the present invention.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an analog signal optical isolation amplifier, is characterized in that, comprises Isolation input unit (11), light-coupled isolation unit (12) and isolation and amplifier unit (13);
The first input end of described Isolation input unit (11) is as the signal input interface of analog signal optical isolation amplifier; Second input connects the first output of light-coupled isolation unit (12), receives the second current signal; Described Isolation input unit (11) is transformed into the first current signal for the voltage analog signal inputted outside, obtains drive singal according to described first current signal; And according to described second current signal, DC error compensation is carried out to signal input interface;
The first input end of described light-coupled isolation unit (12) connects the output of Isolation input unit (11); Light-coupled isolation unit (12), for carrying out electro-optic conversion according to described drive singal, obtains light signal, then converts described light signal to the signal of telecommunication; The isolation to the voltage analog signal that Isolation input unit (11) inputs is realized by described electro-optic conversion and opto-electronic conversion;
The input of described isolation and amplifier unit (13) connects the second output of light-coupled isolation unit (12), receives the 3rd current signal; Output is as the signal output interface of analog signal optical isolation amplifier; Isolation and amplifier unit (13) is for being transformed into voltage signal by the 3rd current signal and amplifying and filtering voltage signal.
2. analog signal optical isolation amplifier as claimed in claim 1, it is characterized in that, described Isolation input unit (11) comprises voltage conversion circuit (111), LED drive circuit (112) and feedback circuit (113);
The first input end of described voltage conversion circuit (111) is as the first input end of Isolation input unit (11), second input connects the output of feedback circuit (113), and power input is as the power interface of Isolation input unit (11); The input of LED drive circuit (112) connects the output of voltage conversion circuit (111), and the output of LED drive circuit (112) is as Isolation input unit (11) output; The input of feedback circuit (113) is as the second input of Isolation input unit (11);
Described voltage conversion circuit (111) is converted to the first current signal for the voltage analog signal inputted outside; LED drive circuit (112) is for generating drive singal according to described first current signal;
Described feedback circuit (113) carries out amplification process to described second current signal, and output feedback signal, voltage conversion circuit (111) carries out DC error compensation according to described feedback signal to signal input interface.
3. analog signal optical isolation amplifier as claimed in claim 1 or 2, it is characterized in that, described voltage conversion circuit (111) comprises the first constant-current source, the first resistance and the second resistance;
Described first constant-current source anode is as the power input of voltage conversion circuit (111); The first end of the first resistance is as the first input end of voltage conversion circuit (111); Second resistance first end is connected with the second end of the first resistance, its link also with the stable node O of the first constant-current source
1connect, and as the output of voltage conversion circuit (111); Second end of the second resistance is as the second input of voltage conversion circuit (111).
4. analog signal optical isolation amplifier as claimed in claim 2, it is characterized in that, described LED drive circuit (112) comprises the first operational amplifier, the 4th resistance and triode; The positive termination Isolation input of input of the first operational amplifier is with reference to ground, and input negative terminal is as the input of LED drive circuit (112); Transistor base connects the output of the first operational amplifier, and emitter is connected with power supply by the 4th resistance, and collector electrode is as the output of LED drive circuit (112).
5. the analog signal optical isolation amplifier as described in claim 2 or 4, is characterized in that, described feedback circuit (113) comprises the second operational amplifier and the 3rd resistance; The input anode of the second operational amplifier connects Isolation input with reference to ground, and input negative terminal is as the input of feedback circuit (113); The first end of the 3rd resistance connects the input negative terminal of the second operational amplifier; Second end of the 3rd resistance connects the output of the second operational amplifier, and its link is as the output of feedback circuit (113).
6. analog signal optical isolation amplifier as claimed in claim 5, it is characterized in that, described light-coupled isolation unit (12) is made up of an optical coupling module, described optical coupling module has 6 ports, first port connects Isolation input with reference to ground, second port is as the input of light-coupled isolation unit (12), and the 3rd port, as the negative terminal of light-coupled isolation unit (12) first output, is connected with the input anode of described second operational amplifier; 4th port, as the anode of light-coupled isolation unit (12) first output, is connected with the input negative terminal of inner second operational amplifier of above-mentioned feedback circuit (113); Five-port is as the negative terminal of light-coupled isolation unit (12) second output; 6th port is as the anode of the second output of light-coupled isolation unit (12);
Described optical coupling module comprises two photodiodes; The anode of the first photodiode is as the 3rd port of optical coupling module, and negative terminal is as the 4th port of optical coupling module; The anode of the second photodiode is as the 6th port of optical coupling module, and negative terminal is as the five-port of optical coupling module;
Described first photodiode is used for transferring light signal to second current signal; Second photodiode is used for transferring described light signal to the 3rd current signal.
7. the analog signal optical isolation amplifier as described in claim 1 or 6, it is characterized in that, described isolation and amplifier unit (13) comprises current converter circuit (131) and amplifying circuit (132), the input of current converter circuit (131) is as the input of isolation and amplifier unit (13), and power input is as the power interface of isolation and amplifier unit (13); The input of amplifying circuit (132) connects current converter circuit (131) output; The output of amplifying circuit (132) is as the output of isolation and amplifier unit; Described current converter circuit (131) for the 3rd current signal is converted to voltage signal, the gain that described amplifying circuit (132) outputs signal for regulating current converter circuit (131).
8. analog signal optical isolation amplifier as claimed in claim 7, it is characterized in that, described current converter circuit (131) comprises the second constant-current source, the 5th resistance, the first electric capacity and the 3rd operational amplifier;
Described second constant-current source anode is as the power input of current converter circuit (131); Described first electric capacity and the 5th resistor coupled in parallel, for eliminating circuit resonance, its first parallel connected end connects the stable node O of the second constant-current source
2; Described first electric capacity value between 0.8pF to 1.0pF; Second parallel connected end connects the output of the 3rd operational amplifier, and tie point is as the output of current converter circuit (131);
The input negative terminal of described 3rd operational amplifier is as the negative terminal of isolation and amplifier (13) unit input; Input anode, as the anode of isolation and amplifier unit (13) input, connects isolation and amplifier with reference to ground.
9. analog signal optical isolation amplifier as claimed in claim 7 or 8, it is characterized in that, described amplifying circuit (132) comprises four-operational amplifier, the 6th resistance and the 7th resistance; Described four-operational amplifier input anode is as the input of amplifying circuit (132); Input negative terminal connects isolation and amplifier ground by the 6th resistance; 7th resistance one end is connected to the input negative terminal of four-operational amplifier, and the other end is connected with the output of four-operational amplifier, and its tie point is as the output of amplifying circuit (132).
10. analog signal optical isolation amplifier as claimed in claim 1, is characterized in that, also comprise power supply, and described power supply comprises the first power supply branch road (2) and the second power supply branch road (3);
Described first power supply branch road (2) comprises the first transformer, the first rectifier bridge, the first pressurizer and the second pressurizer and the first filter capacitor;
The input of described first transformer is used for connecing 220V civil power, the first rectifier bridge input termination first transformer output; First pressurizer is in parallel with the second pressurizer, forms the first voltage stabilizing circuit together with the first filter capacitor being connected across its first parallel connected end; Input termination first rectification bridge output end of the first voltage stabilizing circuit, output, as the first power supply branch road output, is Isolation input unit (11) power supply;
Second power supply branch road (3) comprises the second transformer, the second rectifier bridge, the 3rd pressurizer and the 4th pressurizer and the second filter capacitor;
The input of described second transformer is used for connecing 220V civil power, the second rectifier bridge input termination second transformer output; 3rd pressurizer is in parallel with the 4th pressurizer, forms the second voltage stabilizing circuit together with the second filter capacitor being connected across its first parallel connected end; Second voltage stabilizing circuit input connects the second rectification bridge output end, and output, as the second power supply branch road output, is isolation and amplifier unit (13) power supply.
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| CN201510461330.5A CN105141266A (en) | 2015-07-31 | 2015-07-31 | Photoelectric isolation amplifier of analogue signals |
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| CN107478885A (en) * | 2017-08-02 | 2017-12-15 | 国网陕西省电力公司电力科学研究院 | A kind of differential signal isolated variable device and method suitable for mesohigh signal |
| CN107478885B (en) * | 2017-08-02 | 2023-09-12 | 国网陕西省电力公司电力科学研究院 | Differential signal isolation conversion device and method suitable for medium-high voltage signals |
| CN109995330A (en) * | 2017-12-29 | 2019-07-09 | 锐迪科创微电子（北京）有限公司 | A kind of power amplifier and power amplifier module with power protection |
| CN109995330B (en) * | 2017-12-29 | 2023-09-15 | 锐迪科创微电子（北京）有限公司 | Power amplifier with power protection and power amplifier module |
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| CN109831202A (en) * | 2019-03-07 | 2019-05-31 | 北京中科格励微科技有限公司 | Linear isolator |
| CN110071699A (en) * | 2019-04-24 | 2019-07-30 | 中国科学院合肥物质科学研究院 | A kind of quick high-frequency current amplifier |
| CN110061701A (en) * | 2019-04-24 | 2019-07-26 | 中国科学院合肥物质科学研究院 | A kind of quick high frequency voltage amplifier |
| CN113204256A (en) * | 2021-04-30 | 2021-08-03 | 国家石油天然气管网集团有限公司华南分公司 | Photoelectric conversion circuit of intelligent interface inspection tester and temperature control method |
| CN113204256B (en) * | 2021-04-30 | 2022-07-01 | 国家石油天然气管网集团有限公司华南分公司 | Photoelectric conversion circuit of intelligent interface inspection tester and temperature control method |
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