CN109270380A - Tractive power supply system traveling wave measuring circuit - Google Patents
Tractive power supply system traveling wave measuring circuit Download PDFInfo
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- CN109270380A CN109270380A CN201811209635.7A CN201811209635A CN109270380A CN 109270380 A CN109270380 A CN 109270380A CN 201811209635 A CN201811209635 A CN 201811209635A CN 109270380 A CN109270380 A CN 109270380A
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- 239000003990 capacitor Substances 0.000 claims description 32
- 230000003321 amplification Effects 0.000 claims description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The embodiment of the present invention provides a kind of tractive power supply system traveling wave measuring circuit, comprising: multiple harmonic notch filter circuit, inverse proportion amplifier circuit, subtraction circuit and adder circuit；The output end of multiple harmonic notch filter circuit and the input terminal of subtraction circuit connect, and the output end of subtraction circuit and the output end of inverse proportion amplifier circuit are connect with the input terminal of adder circuit respectively.The embodiment of the present invention carries out multiple trap to harmonic wave by multiple harmonic notch filter circuit, and in such a way that subtraction circuit realizes multiple trap and amplified travelling wave signal subtracts each other, realize the class high-pass filtering to amplitude power frequency component and operation harmonic signal, again by the anti-phase addition with amplified travelling wave signal, so as to accurately filter amplitude power frequency component and operation harmonic signal, the travelling wave signal of required tractive power supply system completely, is accurately proposed.
Description
Technical field
The present embodiments relate to rail traffic traction power supply design fields, more particularly, to a kind of traction power supply system
System traveling wave measuring circuit.
Background technique
Tractive power supply system is used to provide power resources for train operation, and is that the driving such as signal, station key is set on the way
Standby electric supply.Due to train in the process of running can by big load impact, when being run in failure peace,
There are the power frequency impact load electric current and short-circuit current and impact load of far super general power supply line on tractive power supply system
The route operation harmonic wave generated when arrival.When carrying out traveling wave positioning or measurement to tractive power supply system failure, need to acquire
To traveling wave in power frequency component and operation harmonic wave be filtered.Traveling wave measurement method in the prior art is adopted in common traveling wave
Increase filter on collector to realize the separation of travelling wave signal and power frequency component, but amplitude power frequency component can not be efficiently separated
With operation harmonic signal, therefore, existing traveling wave means of filtering is unable to satisfy the traveling wave measurement demand of tractive power supply system.
Summary of the invention
To solve the above-mentioned problems, the embodiment of the present invention provides one kind and overcomes the above problem or at least be partially solved
State the tractive power supply system traveling wave measuring circuit of problem.
The embodiment of the present invention provides a kind of tractive power supply system traveling wave measuring circuit, comprising: multiple harmonic notch filter circuit,
Inverse proportion amplifier circuit, subtraction circuit and adder circuit；Output end and the subtracter electricity of multiple harmonic notch filter circuit
The input terminal on road connects, the output end of the output end of subtraction circuit and inverse proportion amplifier circuit respectively with adder circuit
Input terminal connection；After multiple harmonic notch filter circuit is used to receive the amplified travelling wave signal of tractive power supply system, to amplification
Power frequency component in travelling wave signal and operation harmonic signal afterwards carries out high resistant filtering, and by the travelling wave signal after the trap of acquisition
It is input to subtraction circuit；Subtraction circuit be used for after trap travelling wave signal and amplified travelling wave signal carry out making poor place
Reason, and the power frequency component of acquisition and operation harmonic signal are input to adder circuit；After inverse proportion amplifier circuit is to amplification
Travelling wave signal carry out reverse phase processing, and the reverse phase amplified signal of acquisition is input to adder circuit；Adder circuit is used for
Summation process is carried out to power frequency component, operation harmonic signal and reverse phase amplified signal, and using processing result as traction power supply system
The travelling wave signal measurement result of system.
Tractive power supply system traveling wave measuring circuit provided in an embodiment of the present invention, by multiple harmonic notch filter circuit to humorous
Wave carries out multiple trap, and in such a way that subtraction circuit realizes multiple trap and amplified travelling wave signal subtracts each other, realizes
Class high-pass filtering to amplitude power frequency component and operation harmonic signal, and pass through and the reverse phase phase of amplified travelling wave signal
Add, so as to accurately filter amplitude power frequency component and operation harmonic signal, completely, accurately proposes required traction and supply
The travelling wave signal of electric system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these figures.
Fig. 1 is the structural schematic diagram of tractive power supply system traveling wave measuring circuit provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides tractive power supply system traveling wave measuring circuit structural schematic diagram；
In figure, 101: small signal amplification circuit；102: multiple harmonic notch filter circuit；103: subtraction circuit；104: anti-
Proportional amplifier circuit；105: adder circuit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention is explicitly described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Amplitude power frequency component and operation harmonic wave letter can not be separated from travelling wave signal in order to solve to exist in the prior art
Number the problem of, the embodiment of the present invention provides a kind of tractive power supply system traveling wave measuring circuit, and referring to Fig. 1, which includes:
Multiple harmonic notch filter circuit 102, inverse proportion amplifier circuit 104, subtraction circuit 103 and adder circuit
105；The output end of multiple harmonic notch filter circuit 102 is connect with the input terminal of subtraction circuit 103, subtraction circuit 103
The output end of output end and inverse proportion amplifier circuit 104 is connect with the input terminal of adder circuit 105 respectively；Multiple harmonic is fallen into
After wave device circuit 102 is used to receive the amplified travelling wave signal of tractive power supply system, amplified travelling wave signal is carried out high
Resistance filtering, and the travelling wave signal after the trap of acquisition is input to subtraction circuit 103；Subtraction circuit 103 is used for trap
Travelling wave signal and amplified travelling wave signal afterwards carries out making poor processing, and the power frequency component of acquisition and operation harmonic signal is defeated
Enter to adder circuit 105；Inverse proportion amplifier circuit 104 carries out reverse phase processing to amplified travelling wave signal, and will obtain
Reverse phase amplified signal be input to adder circuit 105；Adder circuit 105 be used for power frequency component, operation harmonic signal and
Reverse phase amplified signal carries out summation process, and using processing result as the travelling wave signal measurement result of tractive power supply system.
Specifically, the travelling wave signal in tractive power supply system is acquired first, and processing is amplified to travelling wave signal later, is obtained
Amplified travelling wave signal is obtained, the embodiment of the present invention is not construed as limiting the concrete mode of enhanced processing.Multiple harmonic trapper electricity
Road 102 for receiving amplified travelling wave signal, in amplified travelling wave signal power frequency component and operation harmonic signal into
The filtering of row high resistant, the travelling wave signal after exporting trap.Also, due to multiple harmonic notch filter circuit 102 be able to carry out repeatedly it is humorous
Wave filters out, therefore can filter out amplitude power frequency component and operation harmonic signal.
Subtraction circuit 103 is used to receive the travelling wave signal after the signal and trap of amplification, carries out subtraction process, exports work
Frequency signal and operation harmonic signal.Inverse proportion amplifier circuit 104 is for receiving amplified travelling wave signal, output reverse phase amplification
Signal；Adder circuit 105 carries out at addition for receiving power frequency component and operation harmonic signal and reverse phase amplified signal
Reason, output filter out power frequency component and run tractive power supply system travelling wave signal (the i.e. row of tractive power supply system after harmonic signal
Wave signal measurement result).
It should be noted that due to using multiple harmonic notch filter circuit 102 filter out power frequency component in travelling wave signal and
Run harmonic signal, and it is above-mentioned filter out during may to travelling wave signal itself exist setting damage (such as will part row
Wave target signal filter).Therefore, the embodiment of the present invention does not directly adopt the travelling wave signal after trap and exports as measurement result, and
It is to carry out certain subsequent arithmetic using subtraction circuit 103, inverse proportion amplifier circuit 104 and adder circuit 105, just will
The travelling wave signal obtained after the processing of adder circuit 105 is as output result.Therefore, the traveling wave letter that adder circuit 105 exports
Number with multiple harmonic notch filter circuit 102 export travelling wave signal it is not identical, adder circuit 105 export travelling wave signal phase
It is more accurate than the travelling wave signal after the trap that multiple harmonic notch filter circuit 102 exports.
Tractive power supply system traveling wave measuring circuit provided in an embodiment of the present invention, by multiple harmonic notch filter circuit to humorous
Wave carries out multiple trap, and in such a way that subtraction circuit realizes multiple trap and amplified travelling wave signal subtracts each other, realizes
Class high-pass filtering to amplitude power frequency component and operation harmonic signal, and pass through and the reverse phase phase of amplified travelling wave signal
Add, so as to accurately filter amplitude power frequency component and operation harmonic signal, completely, accurately proposes required traction and supply
The travelling wave signal of electric system.
Content based on the above embodiment, as a kind of alternative embodiment, tractive power supply system traveling wave measuring circuit is also wrapped
It includes: small signal amplification circuit 101；The output end of small signal amplification circuit 101 respectively with inverse proportion amplifier circuit 104, subtraction
The connection of the input terminal of device circuit 103 and multiple harmonic notch filter circuit 102；Small signal amplification circuit 101 is mutual for receiving electric current
The travelling wave signal of the tractive power supply system of sensor acquisition, and processing is amplified to travelling wave signal, by the amplified row of acquisition
Wave signal is separately input into inverse proportion amplifier circuit 104, subtraction circuit 103 and multiple harmonic notch filter circuit 102.Its
In, the embodiment of the present invention receives the tractive power supply system travelling wave signal of current transformer acquisition using small signal amplification circuit 101,
And the signal of the acquisition output amplification of acquisition is amplified.
Content based on the above embodiment, as a kind of alternative embodiment, referring to fig. 2, small signal amplification circuit 101 is wrapped
It includes: operational amplifier A1, resistance R1, resistance R2, resistance R3 and capacitor C1；One end of resistance R1 is for receiving tractive power supply system
Travelling wave signal, the other end of resistance R1 connect with the non-inverting input terminal of operational amplifier A1；One end of resistance R2 is grounded, resistance
The other end of R2 is connect with the inverting input terminal of operational amplifier A1；The inverting input terminal of operational amplifier A1 by resistance R3 with
The output end of operational amplifier A1 connects, and the inverting input terminal of operational amplifier A1 also passes through capacitor C1's and operational amplifier A1
Output end connection；The output end of operational amplifier A1 respectively with inverse proportion amplifier circuit 104, subtraction circuit 103 and repeatedly
The input terminal of harmonic trap circuit 102 connects.
Specifically, the non-inverting input terminal of operational amplifier A1 is connected with resistance R1, and the other end of resistance R1 is that small signal is put
The input terminal of big circuit 101, the inverting input terminal of operational amplifier A1 are grounded by resistance R2, and the reverse phase of operational amplifier A1 is defeated
Enter the output end that end also connects operational amplifier A1 by resistance R3 in parallel with capacitor C1, the output end of operational amplifier A1 is
The output end of small signal amplification circuit 101.
Content based on the above embodiment, as a kind of alternative embodiment, multiple harmonic notch filter circuit 102 includes multiple groups
Operation amplifier circuit, every group of operation amplifier circuit are used to carry out high resistant filter to the amplified travelling wave signal of setpoint frequency
Wave；Every group of operation amplifier circuit includes: operational amplifier A2, resistance R4, resistance R5, resistance R6, capacitor C2, capacitor C3 and electricity
Hold C4；For receiving amplified travelling wave signal, the other end of capacitor C2 is connect with one end of capacitor C3 for one end of capacitor C2, electricity
The other end for holding C3 is connect with the non-inverting input terminal of operational amplifier A2；One end of resistance R4 is for receiving amplified traveling wave letter
Number, the other end of resistance R4 is connect with one end of resistance R5, the other end of resistance R5 and the inverting input terminal of operational amplifier A2
Connection, the other end of resistance R4 are grounded by capacitor C4；The other end of capacitor C2 is defeated by resistance R6 and operational amplifier A2's
Outlet connection, the inverting input terminal of operational amplifier A2 are connect with the output end of operational amplifier A2, and operational amplifier A2's is defeated
Outlet is connect with the input terminal of subtraction circuit 103.
Wherein, the embodiment of the present invention is not construed as limiting the group number of operation amplifier circuit, should include at least two groups, thus real
High resistant filtering now is carried out to the travelling wave signal of a variety of specific frequencies.It is in parallel between multiple groups operation amplifier circuit, and every group of operation
The input terminal of amplifier circuit is used to receive amplified travelling wave signal, or connect with small signal amplification circuit 101；Every group
The output end of operation amplifier circuit is connect with the input terminal of subtraction circuit 103.Referring to fig. 2, it is fallen into below with multiple harmonic
Wave device circuit 102 for two groups of operational amplifiers including being illustrated:
Multiple harmonic notch filter circuit 102 includes operational amplifier A2 and operational amplifier A3 in parallel, operational amplifier
The non-inverting input terminal of A2 is connected in parallel to capacitor C3 and resistance R5, and the other end of capacitor C3 connects capacitor C2, and capacitor C2's is another
End is the input terminal of multiple harmonic trapper, and the output end that the other end of capacitor C3 also passes through resistance R6 and operational amplifier A2 connects
It connects, the other end of resistance R5 is connected with resistance R4, and the other end of resistance R4 is the input terminal of multiple harmonic trapper, resistance R5's
The other end also passes through capacitor C4 and is grounded, the output end of the inverting input terminal connection operational amplifier A2 of operational amplifier A2.
The non-inverting input terminal of operational amplifier A3 is connected in parallel to capacitor C6 and resistance R8, and the other end of capacitor C6 connects electricity
Hold C5, the other end of capacitor C5 is the input terminal of multiple harmonic trapper, and the other end of capacitor C6 also passes through resistance R9 and operation
The output end of amplifier A3 connects, and the other end of resistance R8 is connected with resistance R7, and the other end of resistance R7 is multiple harmonic trap
The input terminal of device, the other end of resistance R8 also pass through capacitor C7 and are grounded, and the inverting input terminal connection operation of operational amplifier A3 is put
The output end of big device A3, the output end of operational amplifier A2 and the output end of operational amplifier A3 link together, collectively form
The output end of multiple harmonic notch filter circuit 102.
Content based on the above embodiment, as a kind of alternative embodiment, subtraction circuit 103 includes: operational amplifier
A4, resistance R10, resistance R11, resistance R12 and resistance R13；One end of resistance R10 is for receiving amplified travelling wave signal, electricity
The other end of resistance R10 is connect with the inverting input terminal of operational amplifier A4, and the other end of resistance R10 also passes through resistance R11 and fortune
Calculate the output end connection of amplifier A4；One end of resistance R13 is for receiving the travelling wave signal after trap, the other end of resistance R13
It is connect with the non-inverting input terminal of operational amplifier A4, the other end of resistance R13 also passes through resistance R12 and is grounded；Operational amplifier A4
Output end connect with the input terminal of adder circuit 105.
Specifically, subtraction circuit 103 includes operational amplifier A4, and the non-inverting input terminal of operational amplifier A4 connects resistance
The other end of R13, resistance R13 are the input terminal of subtraction circuit 103 and connect with the output end of multiple harmonic notch filter circuit 102
It connects, the non-inverting input terminal of operational amplifier A4 also passes through resistance R12 and is grounded, and the inverting input terminal of operational amplifier A4 is connected with electricity
Hinder R10 and resistance R11, the other end of resistance R10 be the input terminal of subtraction circuit 103 and with small signal amplification circuit 101
Output end connection, the output end of the other end connection operational amplifier A4 of resistance R11, the output end of operational amplifier A4 is subtraction
The output end of device circuit 103.
Content based on the above embodiment, as a kind of alternative embodiment, inverse proportion amplifier circuit 104 includes: operation
Amplifier A5, resistance R14, resistance R15 and resistance R16；One end of resistance R15 is for receiving amplified travelling wave signal, resistance
The other end of R15 is connect with the inverting input terminal of operational amplifier A5, and the other end of resistance R15 also passes through resistance R16 and operation
The output end of amplifier A5 connects；One end of resistance R14 is grounded, and the other end of resistance R14 is same mutually defeated with operational amplifier A4's
Enter end connection；The output end of operational amplifier A5 is connect with the input terminal of adder circuit 105.
Specifically, inverse proportion amplifier circuit 104 includes operational amplifier A5, and the non-inverting input terminal of operational amplifier A5 is logical
Resistance R14 ground connection is crossed, the inverting input terminal of operational amplifier A5 connects resistance R15, and the other end of resistance R15 is inverse proportion amplification
The input terminal of device circuit 104, the inverting input terminal of operational amplifier A5 also pass through the output end of resistance R16 Yu operational amplifier A5
Connection, the output end of operational amplifier A5 are the output end of inverse proportion amplifier circuit 104.
Content based on the above embodiment, as a kind of alternative embodiment, adder circuit 105 includes: operational amplifier
A6, resistance R17, resistance R18, resistance R19 and resistance R20；One end of resistance R19 is for receiving reverse phase amplified signal, resistance R19
The other end connect with the inverting input terminal of operational amplifier A6, the other end of resistance R19 also passes through resistance R20 and operation amplifier
The output end of device A6 connects；One end of resistance R18 is for receiving power frequency component and operation harmonic signal, the other end of resistance R18
It is connect with the inverting input terminal of operational amplifier A6；The non-inverting input terminal of operational amplifier A6 is grounded by resistance R17, and operation is put
The output end of big device A6 is for exporting travelling wave signal measurement result.
Specifically, adder circuit 105 includes operational amplifier A6, and the non-inverting input terminal of operational amplifier A6 passes through resistance
R17 ground connection, the inverting input terminal of operational amplifier A6 connect resistance R18, and the input terminal of resistance R18 is adder circuit 105
Input terminal is simultaneously connect with the output end of subtraction circuit 103, and the inverting input terminal of operational amplifier A6 is also connected with electricity in parallel
Hinder R19 and resistance R20, the other end of resistance R19 be the input terminal of adder circuit 105 and with inverse proportion amplifier circuit 104
Output end connection, the other end of resistance R20 connect with the output end of operational amplifier A6, and the output end of operational amplifier A6 is
The output end of adder circuit 105.
Above-mentioned tractive power supply system traveling wave measuring circuit provided in an embodiment of the present invention, using multiple trap and original signal
The mode subtracted each other constitutes the class high-pass filtering to amplitude power frequency component and operation harmonic signal, and passes through anti-with original signal
Ratio is added, and can accurately filter amplitude power frequency component and operation harmonic signal, and complete extraction goes out required traction power supply system
System travelling wave signal.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. a kind of tractive power supply system traveling wave measuring circuit characterized by comprising multiple harmonic notch filter circuit, inverse proportion
Amplifier circuit, subtraction circuit and adder circuit；The output end and the subtracter of the multiple harmonic notch filter circuit
The input terminal of circuit connects, the output end of the output end of the subtraction circuit and the inverse proportion amplifier circuit respectively with institute
State the input terminal connection of adder circuit；
After the multiple harmonic notch filter circuit is used to receive the amplified travelling wave signal of tractive power supply system, to the amplification
Power frequency component in travelling wave signal and operation harmonic signal afterwards carries out high resistant filtering, and by the travelling wave signal after the trap of acquisition
It is input to the subtraction circuit；
The subtraction circuit be used for after the trap travelling wave signal and the amplified travelling wave signal carry out making poor place
Reason, and the power frequency component of acquisition and the operation harmonic signal are input to the adder circuit；
The inverse proportion amplifier circuit carries out reverse phase processing to the amplified travelling wave signal, and the reverse phase of acquisition is amplified
Signal is input to the adder circuit；
The adder circuit is for asking the power frequency component, the operation harmonic signal and the reverse phase amplified signal
And processing, and using processing result as the travelling wave signal measurement result of the tractive power supply system.
2. tractive power supply system traveling wave measuring circuit according to claim 1, which is characterized in that further include: small signal is put
Big circuit；The output end of the small signal amplification circuit respectively with the inverse proportion amplifier circuit, the subtraction circuit and
The input terminal of the multiple harmonic notch filter circuit connects；
The small signal amplification circuit is used to receive the travelling wave signal of the tractive power supply system of current transformer acquisition, and right
The travelling wave signal amplifies processing, and the amplified travelling wave signal of acquisition is separately input into the inverse proportion and is amplified
Device circuit, the subtraction circuit and the multiple harmonic notch filter circuit.
3. tractive power supply system traveling wave measuring circuit according to claim 2, which is characterized in that the low level signal amplification electricity
Road includes: operational amplifier A1, resistance R1, resistance R2, resistance R3 and capacitor C1；
One end of the resistance R1 is used to receive the travelling wave signal of the tractive power supply system, the other end of the resistance R1 and institute
State the non-inverting input terminal connection of operational amplifier A1；
One end of the resistance R2 is grounded, and the inverting input terminal of the other end of the resistance R2 and the operational amplifier A1 connect
It connects；
The inverting input terminal of the operational amplifier A1 is connect by the resistance R3 with the output end of the operational amplifier A1,
The inverting input terminal of the operational amplifier A1 also passes through the capacitor C1 and connect with the output end of the operational amplifier A1；
The output end of the operational amplifier A1 respectively with the inverse proportion amplifier circuit, the subtraction circuit and described more
The input terminal of subharmonic notch filter circuit connects.
4. tractive power supply system traveling wave measuring circuit according to claim 1, which is characterized in that the multiple harmonic trap
Device circuit includes multiple groups operation amplifier circuit, after operation amplifier circuit described in every group is used for the amplification of setpoint frequency
Travelling wave signal carry out high resistant filtering；Operation amplifier circuit described in every group include: operational amplifier A2, resistance R4, resistance R5,
Resistance R6, capacitor C2, capacitor C3 and capacitor C4；
One end of the capacitor C2 is for receiving the amplified travelling wave signal, the other end and the capacitor of the capacitor C2
One end of C3 connects, and the other end of the capacitor C3 is connect with the non-inverting input terminal of the operational amplifier A2；
One end of the resistance R4 is for receiving the amplified travelling wave signal, the other end and the resistance of the resistance R4
One end of R5 connects, and the other end of the resistance R5 is connect with the inverting input terminal of the operational amplifier A2, the resistance R4
The other end pass through the capacitor C4 be grounded；
The other end of the capacitor C2 is connect by the resistance R6 with the output end of the operational amplifier A2, and the operation is put
The inverting input terminal of big device A2 is connect with the output end of the operational amplifier A2, the output end of the operational amplifier A2 and institute
State the input terminal connection of subtraction circuit.
5. tractive power supply system traveling wave measuring circuit according to claim 1, which is characterized in that the subtraction circuit packet
It includes: operational amplifier A4, resistance R10, resistance R11, resistance R12 and resistance R13；
One end of the resistance R10 is for receiving the amplified travelling wave signal, the other end of the resistance R10 and the fortune
The inverting input terminal connection of amplifier A4 is calculated, the other end of the resistance R10 also passes through resistance R11 and the operational amplifier A4
Output end connection；
One end of the resistance R13 is for receiving the travelling wave signal after the trap, the other end of the resistance R13 and the fortune
The non-inverting input terminal connection of amplifier A4 is calculated, the other end of the resistance R13 also passes through the resistance R12 ground connection；
The output end of the operational amplifier A4 is connect with the input terminal of the adder circuit.
6. tractive power supply system traveling wave measuring circuit according to claim 1, which is characterized in that the inverse proportion amplifier
Circuit includes: operational amplifier A5, resistance R14, resistance R15 and resistance R16；
One end of the resistance R15 is for receiving the amplified travelling wave signal, the other end of the resistance R15 and the fortune
The inverting input terminal connection of amplifier A5 is calculated, the other end of the resistance R15 also passes through resistance R16 and the operational amplifier A5
Output end connection；
One end of the resistance R14 is grounded, and the non-inverting input terminal of the other end of the resistance R14 and the operational amplifier A4 connect
It connects；
The output end of the operational amplifier A5 is connect with the input terminal of the adder circuit.
7. tractive power supply system traveling wave measuring circuit according to claim 1, which is characterized in that the adder circuit packet
It includes: operational amplifier A6, resistance R17, resistance R18, resistance R19 and resistance R20；
For receiving the reverse phase amplified signal, the other end and the operation of the resistance R19 is put for one end of the resistance R19
The inverting input terminal connection of big device A6, the other end of the resistance R19 also pass through the defeated of the resistance R20 and operational amplifier A6
Outlet connection；
For receiving the power frequency component and the operation harmonic signal, the resistance R18's is another for one end of the resistance R18
End is connect with the inverting input terminal of the operational amplifier A6；
The non-inverting input terminal of the operational amplifier A6 is grounded by the resistance R17, the output end of the operational amplifier A6
For exporting the travelling wave signal measurement result.
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| CN201811209635.7A CN109270380B (en) | 2018-10-17 | 2018-10-17 | Travelling wave measuring circuit of traction power supply system |
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| CN201811209635.7A CN109270380B (en) | 2018-10-17 | 2018-10-17 | Travelling wave measuring circuit of traction power supply system |
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