CN106817095A - A kind of small-signal isolated amplifier with self-calibration function - Google Patents
A kind of small-signal isolated amplifier with self-calibration function Download PDFInfo
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- CN106817095A CN106817095A CN201710098855.6A CN201710098855A CN106817095A CN 106817095 A CN106817095 A CN 106817095A CN 201710098855 A CN201710098855 A CN 201710098855A CN 106817095 A CN106817095 A CN 106817095A
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- 238000002955 isolation Methods 0.000 claims abstract description 26
- 230000001052 transient effect Effects 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 8
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of small-signal isolated amplifier with self-calibration function, including：Sample of signal and protection loop, signal condition and calibration loop and isolation amplifying return circuit and insulating power supply, sample of signal and protection loop realize that the small voltage signal being input into electronic type voltage transformer is acquired by capacitance partial pressure, signal condition and calibration loop carry out voltage amplification to the signal for collecting, isolation amplifying return circuit carries out Current amplifier and transformation to the signal by voltage amplification, for late-class circuit provides the input signal for meeting power requirement, in the present invention with self-calibration function small-signal isolated amplifier solve when automatic recloser is input into using electronic mutual inductor due to high pressure interference fringe come influence, improve the stability of reclosing devices, reliability and compatibility.
Description
Technical field
The present invention relates to distribution network automated technical field, more particularly to a kind of small-signal isolation with self-calibration function
Amplifier.
Background technology
Automatic recloser is installed on outdoor column type switch-side, is mainly used in monitoring circuit operation warning information and judges event
Barrier state, in short-term or permanent fault, and long-distance Log server gives automation main station system for treatment.When line failure, work people
Member can rapidly determine fault section, and find out trouble point by the police instruction of the information of upload；Warning message can be sent in real time
The server of Surveillance center, shows region and the particular location of guilty culprit on the screen of master station, guides line walking people
Member is rapid to be determined fault section and finds out trouble point；Automatic recloser can also complete the finger that main station system is issued by remote mode
Order, supports local maintenance and config failure.
However, existing automatic recloser there are the following problems in the application：1) automatic recloser is mutual using electronic type
During sensor, due to effective electromagnetic isolation cannot be carried out to small voltage signal, interference is readily incorporated, the height that switching manipulation is produced is pressed dry
Disturb the stable operation of easily influence equipment；2) AC signal of input automatic recloser protection location cannot realize that conventional voltage is believed
Number and small voltage signal convenient switching.
The content of the invention
Goal of the invention：In order to solve deficiency of the prior art, the present invention provides a kind of small letter with self-calibration function
Number isolated amplifier, is applied to automatic recloser, as the preposition loop of automatic recloser voltage input signal, effectively electromagnetism
Isolation is realized effectively filtering out interference, improves the stability and reliability of reclosing devices.
Technical scheme：In order to solve the above technical problems, the small-signal isolated amplifier with self-calibration function in the present invention,
Used when automatic recloser accesses the signal of electronic mutual inductor, the amplifier includes：Sample of signal and protection loop, signal
Conditioning and calibration loop and isolation amplifying return circuit and insulating power supply；Sample of signal and protection loop are used to gather electronic type mutual inductance
The small voltage analog signal of device input；The small voltage analog signal that signal condition and self-correcting quasi loop are used to collect is put
Ambassador its voltage reaches specified amplitude；The signal that isolation amplifying return circuit is used to have adjusted voltage magnitude carries out Current amplifier and work(
Rate is matched；Insulating power supply is that signal condition and calibration loop and isolation amplifying return circuit are powered.
Wherein, the sample of signal and protection loop include low-voltage arm electric capacity C2, transient voltage suppressor TVS1 with
And two high-impedance resistors R1 and resistance R2；The first end of low-voltage arm electric capacity C2 connects the output end of electronic type voltage transformer,
The second end ground connection of low-voltage arm electric capacity C2；One end of transient voltage suppressor TVS1 connects with the first end of low-voltage arm electric capacity C2
Connect, other end ground connection, transient voltage suppressor TVS1 is in parallel with the series circuit that resistance R2, resistance R1 are formed.
Wherein, the signal condition and calibration loop include operational amplifier, and the negative-phase input of the amplifier amplifier connects
Second end of connecting resistance R3, the first end of the first end connection low-voltage arm electric capacity C2 of resistance R3；The normal phase input end of amplifier passes through
Resistance R4 is grounded, and output end connects negative-phase input by adjustable resistance R5.
Wherein, the isolation amplifying return circuit includes following circuit and transformer, follows the input of circuit to connect signal and adjusts
The output end of reason and calibration loop, follows the input of the output end connection transformer of circuit, the input of transformer simultaneously to connect electricity
Resistance R6.
Beneficial effect：Small-signal isolated amplifier with self-calibration function in the present invention, as automatic recloser voltage
The preposition loop of input signal, for conditioned signal, isolation interference optimizes the design of rear end protection module, is easy to the dimension of equipment
Shield and replacing.The small-signal isolated amplifier is realized to electronic type first with sample of signal and protection loop by capacitance partial pressure
The small voltage signal of voltage transformer input is acquired, and the signal for collecting is entered using signal condition and calibration loop then
Row voltage amplification, recycles isolation amplifying return circuit to realize electromagnetic isolation by transformer, and the signal by voltage amplification is carried out
Current amplifier and transformation, for late-class circuit provides the input signal for meeting power requirement, using with self calibration work(in the present invention
The small-signal isolated amplifier of energy improves the compatible and maintainability of automatic recloser input signal.
Brief description of the drawings
Fig. 1 is the function structure chart of the automatic recloser after the present invention is improved；
Fig. 2 is the function structure chart of the small-signal isolated amplifier with self-calibration function in the present invention；
Fig. 3 is the circuit diagram in sample of signal and protection loop；
Fig. 4 is the circuit diagram of signal condition and calibration loop；
Fig. 5 is the circuit diagram for isolating amplifying return circuit；
Fig. 6 is the waveform enlarged diagram of the small-signal isolated amplifier with self-calibration function in the present invention.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, and this implementation row do not constitute restriction to the present invention.
As shown in figure 1, automatic recloser includes power module, control unit, protection location and energy-storage travelling wave tube, power module
It is that control unit and protection location are powered that 220V alternating currents are carried out into voltage conversion；Protection location enters to the electric signal for accessing
Row judges that monitoring circuit runs warning information and failure judgement state；Control unit is processed failure, and energy-storage travelling wave tube coordinates
Control unit realizes corresponding control.Automatic recloser can access traditional CT (current transformer), tradition PT (mutual induction of voltage
Device) and electronic type PT (voltage transformer) input signal, electronic type PT (voltage transformer) input signal belong to small electricity
Pressure signal, the present invention existing automatic recloser is improved, automatic recloser access electronic type PT when, in electronic type
Small-signal isolated amplifier is increased between PT and protection location.
Using small-signal isolated amplifier as the preposition module of protection location, it is mainly used in nursing one's health electronic type voltage transformer
Input signal, isolation interference, optimize rear end protection location design, be easy to the maintenance and replacing of equipment.Using traditional type
When transformer is input into, automatic recloser protection location is directly accessed the signal of traditional CT and tradition PT, is using electronic type mutual inductance
During device, with a small-signal isolated amplifier with self-calibration function so that automatic recloser protection location can be directly accessed
The signal of traditional CT and electronic type PT, without changing any design.The use occasion of automatic recloser equipment is expanded, and has been lifted
Electro Magnetic Compatibility of the automatic recloser when electronic mutual inductor occasion is accessed.
As shown in Fig. 2 automatic recloser access electronic mutual inductor when, the above-mentioned small-signal with self-calibration function every
Include from amplifier：Sample of signal and protection loop, signal condition and calibration loop and isolation amplifying return circuit and insulating power supply；
The input in sample of signal and protection loop connects the output end of electronic mutual inductor, and output end connects signal condition and calibrates back
The input of the output end connection isolation amplifying return circuit of the input on road, signal condition and calibration loop, isolation amplifying return circuit
Output end connects the input of automatic recloser protection location.Sample of signal and protection loop collection electronic type voltage transformer are defeated
The small voltage analog signal that the small voltage analog signal for entering, signal condition and self-correcting quasi loop will be collected is amplified makes its electricity
Pressure reaches specified amplitude；The signal that isolation amplifying return circuit will adjust voltage magnitude carries out Current amplifier and transformation, realizes power
Matching, to meet scope and power requirement of the rear class protection location to input signal；Insulating power supply is signal condition and calibrates back
Road and isolation amplifying return circuit are powered.
Protection location in automatic recloser has the limitation of input range and input power, input range to the signal being input into
Refer to the input of the great voltage of protection location support or electric current, electric parameter may be exceeded beyond a range of signal
Design objective, causes to damage or None- identified.Input power refers to the driving energy of the electric parameter to signal of signal input part
Power there are certain requirements, if driving force is too weak, can cause signal cannot effectively by isolating transformer ground the progress of disease.
As shown in figure 3, sample of signal and protection loop include low-voltage arm electric capacity C2, transient voltage suppressor TVS1 with
And two high-impedance resistors R1 and resistance R2；High voltage arm capacitor C1 in Fig. 3 is a part for electronic type voltage transformer, and it the
One termination high-voltage signal HV, the second end as electronic type voltage transformer output end, low-voltage arm electric capacity C2 first end connection
Second end of high voltage arm capacitor C1, the second end ground connection of low-voltage arm electric capacity C2, the signal to electronic type voltage transformer input enters
Row capacitance partial pressure, collects small voltage signal UA_IN1；The first end of transient voltage suppressor TVS1 and low-voltage arm electric capacity
The first end connection of C2, the second end ground connection, the first end of transient voltage suppressor TVS1 is connected with the first end of resistance R2,
Second end of resistance R2 is connected with the first end of resistance R1, and second end of resistance R1 is connected with second end of TVS1, i.e. transient electrical
Constrain diode TVS1 processed in parallel with the series circuit that resistance R1 and resistance R2 are formed, realize to small voltage signal UA_IN1's
Protection.
Wherein, the electric capacity of high voltage arm capacitor C1 is 25pF, and the electric capacity of low-voltage arm electric capacity C2 is 100nF, sampled voltage signal
The specified amplitude of UA_IN1 is 2V, and excursion is 0~4V；TVS pipe is used to clamp the related component of pressure protection, in order to avoid there is device
Part is damaged；Resistance R1 and resistance R2 use high-impedance resistors, and resistance is 2M ohm, and the resistance of high impedance is used for balanced sampling resistance
It is anti-, stabilization sampled signal.
As shown in figure 4, signal condition and calibration loop are built using the amplifier of high input impedance, can be using low partially
Voltage operational amplifier OPA297A is put, second end of the negative-phase input connection resistance R3 of the amplifier, the first end of resistance R3 connects
Connect the first end of low-voltage arm electric capacity C2；The normal phase input end of amplifier is grounded by resistance R4, and output end is connected by adjustable resistance R5
Connect negative-phase input.
Insulating power supply, can use DCDC isolation modules, and the voltage of isolation 24V generation ± 18V, amplifier uses insulating power supply
Power supply, meets the signal input of relative broad range, and by anti-phase amplification, filters the common mode disturbances of doping, with reference to volume of electric power
Determine parameter, the small voltage signal of sampling can be adjusted to the corresponding signal amplitude of rated value.Participate in putting in circuit by changing
The parameter (related elements are realized using high-precision adjustable resistance) of the circuit element that big coefficient is calculated, can easily adjust
The proportionality coefficient of amplifying circuit, realizes automatic calibration, so as to adjust the output signal amplitude of amplifying circuit, obtains voltage amplification
Signal UA1.
As shown in figure 5, isolation amplifying return circuit includes：Circuit and 4 are followed with High-current output:The transformer of 115V
(supporting 8V input/230V outputs), follows the input connection signal condition of circuit and the output end of calibration loop, follows circuit
Output end connect the input of transformer, the input of transformer and connecting resistance R6.Circuit is followed using amplifier TLE2062A,
But not limited to this model, amplification module output current is not less than 1.5mA, input current is not less than 45mA, and power consumption is less than
The output end of the normal phase input end concatenation operation amplifier OPA297A of 8mW, operational amplifier TLE2062A, operational amplifier
The output end connection negative-phase input of TLE2062A.Electromagnetic isolation is realized by transformer, prime and rear class are without directly electricity
Gas is contacted, i.e. input signal UA1 and output signal VA1 mainly realizes the transmission of signal by magnetic field, between without directly electrically
Contact.
As shown in fig. 6, solid line is the small voltage signal of input, dotted line is the amplification voltage signal of output, can be with from figure
The virtual value of input voltage UA_IN1 is found out for 2V, and the virtual value of output voltage VA1 is 57.5V, and no-load voltage ratio is 1:28.75, meet
System design considerations.
This is applied in automatic recloser with small-signal isolated amplifier of self-calibration function, it is to avoid automatic reclosing
Due to the interference that cannot be effectively isolated to signal and be brought when device is input into using electronic mutual inductor, the stabilization of equipment is improved
Property and reliability；Meanwhile, the small-signal isolated amplifier that should carry self-calibration function can access small voltage signal, be easy to implement
The switching of conventional voltage signal and small voltage signal, further expands the input reference signal of automatic recloser, can automatically
Automatic circuit is applied to more occasions, improves compatibility.
Claims (5)
1. a kind of small-signal isolated amplifier with self-calibration function, the signal of electronic mutual inductor is accessed in automatic recloser
When use, it is characterised in that the amplifier includes：Sample of signal and protection loop, signal condition and calibration loop and isolation are put
Big loop and insulating power supply；Sample of signal and the small voltage analog signal of protection loop collection electronic mutual inductor input；Letter
Number conditioning and the small voltage analog signal that will collect of self-correcting quasi loop are amplified and its voltage is reached specified amplitude；Isolation is put
The signal that big loop will adjust voltage magnitude carries out Current amplifier and power match；Insulating power supply is signal condition and calibrates back
Road and isolation amplifying return circuit are powered.
2. the small-signal isolated amplifier with self-calibration function according to claim 1, it is characterised in that the signal
Sampling and protection loop include low-voltage arm electric capacity C2, transient voltage suppressor TVS1 and resistance R1 and resistance R2；Low pressure
The first end of arm electric capacity C2 connects the output end of electronic mutual inductor, the second end ground connection of low-voltage arm electric capacity C2；Transient electrical is constrained
One end of diode TVS1 processed is connected with the first end of low-voltage arm electric capacity C2, other end ground connection, transient voltage suppressor
TVS1 is in parallel with the series circuit that resistance R2, resistance R1 are formed.
3. the small-signal isolated amplifier with self-calibration function according to claim 2, it is characterised in that the signal
Conditioning and calibration loop include operational amplifier, second end of the negative-phase input connection resistance R3 of the operational amplifier, resistance
The first end of the first end connection low-voltage arm electric capacity C2 of R3；The normal phase input end of operational amplifier is grounded by resistance R4, output
End connects negative-phase input by adjustable resistance R5.
4. the small-signal isolated amplifier with self-calibration function according to claim 3, it is characterised in that the isolation
Amplifying return circuit includes following circuit and transformer, follows the input connection signal condition of circuit and the output end of calibration loop,
Follow the input of the output end connection transformer of circuit, the input and connecting resistance R6 of transformer.
5. the small-signal isolated amplifier with self-calibration function according to claim 4, it is characterised in that described to follow
Circuit uses operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098855.6A CN106817095A (en) | 2017-02-23 | 2017-02-23 | A kind of small-signal isolated amplifier with self-calibration function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098855.6A CN106817095A (en) | 2017-02-23 | 2017-02-23 | A kind of small-signal isolated amplifier with self-calibration function |
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| Publication Number | Publication Date |
|---|---|
| CN106817095A true CN106817095A (en) | 2017-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710098855.6A Pending CN106817095A (en) | 2017-02-23 | 2017-02-23 | A kind of small-signal isolated amplifier with self-calibration function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426873A (en) * | 2020-05-13 | 2020-07-17 | 南京海兴电网技术有限公司 | Electronic AC sensor sampling and metering circuit |
| CN116683401A (en) * | 2023-07-28 | 2023-09-01 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201828595U (en) * | 2010-09-20 | 2011-05-11 | 河南辉煌科技股份有限公司 | DC voltage signal isolating amplifier circuit |
| CN105572453A (en) * | 2016-01-08 | 2016-05-11 | 珠海许继电气有限公司 | Voltage acquisition electronic sensor apparatus |
| CN206547079U (en) * | 2017-02-23 | 2017-10-10 | 南京海兴电网技术有限公司 | A kind of small-signal isolated amplifier with self-calibration function |
-
2017
- 2017-02-23 CN CN201710098855.6A patent/CN106817095A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201828595U (en) * | 2010-09-20 | 2011-05-11 | 河南辉煌科技股份有限公司 | DC voltage signal isolating amplifier circuit |
| CN105572453A (en) * | 2016-01-08 | 2016-05-11 | 珠海许继电气有限公司 | Voltage acquisition electronic sensor apparatus |
| CN206547079U (en) * | 2017-02-23 | 2017-10-10 | 南京海兴电网技术有限公司 | A kind of small-signal isolated amplifier with self-calibration function |
Non-Patent Citations (1)
| Title |
|---|
| 叶磊: "基于电阻分压的10kV电子式电压互感器的研究" * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426873A (en) * | 2020-05-13 | 2020-07-17 | 南京海兴电网技术有限公司 | Electronic AC sensor sampling and metering circuit |
| CN116683401A (en) * | 2023-07-28 | 2023-09-01 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
| CN116683401B (en) * | 2023-07-28 | 2023-10-10 | 华中科技大学 | Resonance overvoltage protection method and system for electronic voltage transformer |
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Application publication date: 20170609 |