CN106788609A - The circuit of broadband power line carrier signal multistage adjustable attenuator - Google Patents
The circuit of broadband power line carrier signal multistage adjustable attenuator Download PDFInfo
- Publication number
- CN106788609A CN106788609A CN201710041605.9A CN201710041605A CN106788609A CN 106788609 A CN106788609 A CN 106788609A CN 201710041605 A CN201710041605 A CN 201710041605A CN 106788609 A CN106788609 A CN 106788609A
- Authority
- CN
- China
- Prior art keywords
- double
- resistance
- throw switch
- port
- point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/24—Frequency- independent attenuators
Abstract
The embodiment of the present invention discloses a kind of circuit of broadband power line carrier signal multistage adjustable attenuator, belong to power domain, the circuit is connected between AC port P1 and AC port P2, the AC port P1 includes tie point a1, tie point b1, the AC port P2 includes tie point a2, tie point b2, and the circuit includes：The multistage decay channel module of electric power low-pass filtering module, carrier signal.
Description
Technical field
The present invention relates to a kind of circuit of broadband power line carrier signal multistage adjustable attenuator, belong to power domain.
Background technology
Power line carrier signal adjustable attenuator is the visual plant tested carrier telecommunication, is based on
Power line carrier signal adjustable attenuator can be with the emissive porwer of detected carrier communicator, emission effciency, receiving sensitivity etc.
Performance parameter, checks antinoise, jamproof ability, can also be used to realize controllable network trunk relation in networking test,
The pad value of existing power line carrier signal circuit has much room for improvement.
The content of the invention
The embodiment of the present invention provides a kind of circuit of broadband power line carrier signal multistage adjustable attenuator, can realize many
The adjustable decay regulation and control of level.
The embodiment of the present invention is adopted the following technical scheme that：
A kind of circuit of broadband power line carrier signal multistage adjustable attenuator, the circuit be connected to AC port P1 and
Between AC port P2, the AC port P1 includes tie point comprising tie point a1, tie point b1, the AC port P2
A2, tie point b2, the circuit include：The multistage decay channel module of electric power low-pass filtering module, carrier signal；
The electric power low-pass filtering module includes：The exchange end is connected to from the tie point a1 ends of the AC port P1
The a circuits at the tie point a2 ends of mouth P2, a circuits are provided with the m inductance L for sealing in successivelyL1、LL2、…、LLm, wherein m is
Integer more than or equal to 3；
The electric power low-pass filtering module includes：The exchange end is connected to from the tie point b1 ends of the AC port P1
The b circuits at the tie point b2 ends of mouth P2, the b circuits are provided with and the m inductance LL1、LL2、…、LLmOne-to-one corresponding is sealed in
M inductance LN1、LN2、…、LNm；
The electric power low-pass filtering module includes：Inductance L on a circuitsLiElectrical energy inputs, the b circuits
Upper corresponding inductance LNiElectrical energy inputs between parallel connection by electric capacity CLiWith resistance RLiRC circuits in series, wherein, i
=1,2 ..., m, wherein m is the integer more than or equal to 3, the tie point a2 ends of the AC port P2, tie point b2 ends it
Between connect by electric capacity CL(m+1)With resistance RL(m+1)RC circuits in series, and resistance RC1；
The multistage decay channel module of the carrier signal includes：From the tie point a1 ends of the AC port P1 to the friendship
The c circuits at the tie point a2 ends of flow port P2, install the electric capacity C being sequentially connected in series on the c circuitsH1, resistance RH1, resistance RH2, electricity
Hold CH2；
The multistage decay channel module of the carrier signal includes：From the tie point b1 ends of the AC port P1 to the friendship
The d circuits at the tie point b2 ends of flow port P2, install the electric capacity C being sequentially connected in series on the d circuitsH3, resistance RH3, resistance RH4, electricity
Hold CH4；
The multistage decay channel module of the carrier signal includes：Variable resistor, one end of the variable resistor is connected to electricity
Resistance RH1With resistance RH2Between, the other end of the variable resistor is connected to resistance RH3With resistance RH4Between.
Optionally, the electric capacity CH1With the electric capacity CH2Correspond to respectively afterwards and access coupling transformer TH1Primary side two ends in
Each one end, coupling transformer TH1Secondary c1 and d1 two ends between successively 1st grade of decay path in parallel, the 2nd grade of decay path,
Two wiring points after to n-th grade of decay path, correspond to access coupling transformer T respectivelyH2Secondary c2 ends, d2 ends, coupling become
Depressor TH2Primary side two ends in each one end correspond to access series capacitance C respectivelyH3And CH4Afterwards the a2 ends of connection AC port P2 and
B2 ends；
Each described decay path, including two double-point double-throw switch WHjaAnd WHjb, described each decay path
Also include by resistance RHja、RHjc、RHjb、RHjdThe j-th stage series circuit ring of sequentially end to end composition, wherein j=1,2 ..., n,
In respective attenuation path：Resistance RHjcIt is connected in parallel on double-point double-throw switch WHjaFirst, second switching end between, double-point double-throw switch
WHjaThe three, the 4th switching terminal shortcircuits, double-point double-throw switch WHjaThe first common port concatenation double-point double-throw switch WH(j-1)a's
Second common port, double-point double-throw switch WHjaThe second common port concatenation double-point double-throw switch WH(j+1)aThe first common port, separately
Outward, double-point double-throw switch WH1aThe first common port concatenation coupling transformer TH1Secondary c1, double-point double-throw switch WHnaSecond
Common port concatenation coupling transformer TH2Secondary c2；Resistance RHjdIt is connected in parallel on double-point double-throw switch WHjbThe three, the 4th switching ends
Between, double-point double-throw switch WHjbFirst, second switching terminal shortcircuit, double-point double-throw switch WHjbThe first common port concatenation double-pole
Commutator WH(j-1)bThe second common port, double-point double-throw switch WHjbThe second common port concatenation double-point double-throw switch WH(j+1)b's
First common port, double-point double-throw switch WH1bThe first common port concatenation coupling transformer TH1Secondary d1, double-point double-throw switch
WHnbThe second common port concatenation coupling transformer TH2Secondary d2.
Optionally, the b1 ends of the AC port P1 of the electric power low-pass filtering module to the b2 ends of AC port P2 are gone here and there successively
The inductance L for enteringNiShort-circuit line short circuit is used respectively, so as to constitute asymmetric loop.
Optionally, the multistage decay channel module of the carrier signal, coupling transformer TH1And TH2With identical no-load voltage ratio.
Optionally, the multistage decay channel module of the carrier signal, connects respectively from the a1 ends and b1 ends of AC port P1
Electric capacity CH1And CH2Access c1 and d1 two ends afterwards, c1 and d1 two ends the 1st grade of decay path in parallel, the 2nd grade of decay path, extremely successively
After n-th grade of decay path, c2 and d2 two ends and respectively series capacitance C are accessedH3And CH4Afterwards, the a2 ends of incoming transport port P2 and
B2 ends.
Optionally, kth level decay path in the multistage decay channel module of the carrier signal, wherein 1≤k≤n, resistance
RHkaAnd RHkbResistance it is identical, resistance RHkcAnd RHkdResistance it is identical.
Optionally, pth level decay path has dissymmetrical structure in the multistage decay channel module of the carrier signal, wherein
1≤p≤n, pth level decay path is included by resistance RHpa、RHpc、RHpbThe series circuit ring that order is connected and composed from beginning to end, pth level
Decay path also includes that double-pole double-throw switchs WHpa, resistance RHpcIt is connected in parallel on double-point double-throw switch WHpaFirst, second switching end
Between, double-point double-throw switch WHpaThe three, the 4th switching ends between short circuit, double-point double-throw switch WHpaThe first common port concatenation
Double-point double-throw switch WH(p-1)aThe second common port, double-point double-throw switch WHpaThe second common port concatenation double-point double-throw switch
WH(p+1)aThe first common port, double-point double-throw switch WH1aThe first common port connection coupling transformer TH1Secondary c1, double-pole is double
Throw switch WHnaThe second common port connection coupling transformer TH2Secondary c2, resistance RHpaWith resistance RHpbTie point access coupling
Close transformer TH1Secondary d1 and coupling transformer TH2Secondary d2 between wiring pathways on.
Optionally, r grades of decay path has dissymmetrical structure in the multistage decay channel module of the carrier signal, wherein
1≤r≤n, r grades of decay path is included by resistance RHra、RHrb、RHrdThe series circuit ring that order is connected and composed from beginning to end, r grades
Decay path also includes that double-pole double-throw switchs WHrb, resistance RHrdIt is connected in parallel on double-point double-throw switch WHrbThe three, the 4th switching ends
Between, double-point double-throw switch WHrbFirst, second switching end between short circuit；Double-point double-throw switch WHrbThe first common port concatenation
Double-point double-throw switch WH(r-1)bThe second common port, double-point double-throw switch WHrbThe second common port concatenation double-point double-throw switch
WH(r+1)bThe first common port, double-point double-throw switch WH1bThe first common port connection coupling transformer TH1Secondary d1, double-pole is double
Throw switch WHnbThe second common port connection coupling transformer TH2Secondary d2；Resistance RHraWith resistance RHrbTie point access coupling
Close transformer TH1Secondary c1 and coupling transformer TH2Secondary c2 between wiring pathways on.
Optionally, s grades of decay path is fixed attenuation path in the multistage decay channel module of the carrier signal, wherein
1≤s≤n, s grades of decay path is included by resistance RHsa、RHsc、RHsb、RHsdThe series circuit that order is connected and composed from beginning to end, 2
During≤s≤n-1, resistance RHscFirst end connection resistance RH(s-1)cThe second end, resistance RHscThe second end connection resistance RH(s+1)c
First end, resistance RH1cFirst end connection coupling transformer TH1Secondary c1, resistance RHncThe second end connection coupling transformation
Device TH2Secondary c2；In 2≤s≤n-1, resistance RHsdFirst end connection resistance RH(s-1)dThe second end, resistance RHsd
Two ends connect resistance RH(s+1)dFirst end, resistance RH1dFirst end connection coupling transformer TH1Secondary d1, resistance RHnd's
Second end connects coupling transformer TH2Secondary d2.
Optionally, t grades of decay path in the multistage decay channel module of the carrier signal, wherein 1≤t≤n：Resistance
RHtaAnd RHtbResistance it is identical, resistance RHta、RHtb、RHtcAnd RHtdMeet：
RL=RHia//(RHic+RHid+RHib//RL)
Wherein, resistance value RLIt is the matched impedance designs value of attenuator.
The circuit of the embodiment of the present invention, the circuit is realized while the low-frequency ac electric energy of transmission certain power is ensured
Broadband power line carrier signal to high frequency carries out multistage adjustable decay regulation and control, and decay quantitatively regulating and controlling is easier.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The disclosure can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows and meets implementation of the invention
Example, and be used to explain principle of the invention together with specification.
Fig. 1 is one of circuit structure diagram of broadband power line carrier signal multistage adjustable attenuator of the embodiment of the present invention.
Fig. 2 is the two of the circuit structure diagram of the broadband power line carrier signal multistage adjustable attenuator of the embodiment of the present invention.
Fig. 3 is the three of the circuit structure diagram of the broadband power line carrier signal multistage adjustable attenuator of the embodiment of the present invention.
Fig. 4 is the broadband power line carrier signal multistage adjustable attenuator of the embodiment of the present invention in different adjustable damping series
Attenuation rate under state with frequency change curve.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in implementation method do not represent and the consistent all implementation methods of the present invention.Conversely, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
Embodiment 1
As shown in Figure 1, Figure 2, Figure 3 shows, the embodiment of the present invention provides a kind of broadband power line carrier signal multistage adjustable damping
The circuit of device, the circuit is connected between AC port P1 and AC port P2, the AC port P1 comprising tie point a1,
Tie point b1, the AC port P2 include tie point a2, tie point b2, and the circuit includes：Electric power low-pass filtering module, load
The multistage decay channel module of ripple signal；
The electric power low-pass filtering module includes：The exchange end is connected to from the tie point a1 ends of the AC port P1
The a circuits at the tie point a2 ends of mouth P2, a circuits are provided with the m inductance L for sealing in successivelyL1、LL2、…、LLm, wherein m is
Integer more than or equal to 3；
The electric power low-pass filtering module includes：The exchange end is connected to from the tie point b1 ends of the AC port P1
The b circuits at the tie point b2 ends of mouth P2, the b circuits are provided with and the m inductance LL1、LL2、…、LLmOne-to-one corresponding is sealed in
M inductance LN1、LN2、…、LNm；
The electric power low-pass filtering module includes：Inductance L on a circuitsLiElectrical energy inputs, the b circuits
Upper corresponding inductance LNiElectrical energy inputs between parallel connection by electric capacity CLiWith resistance RLiRC circuits in series, wherein, i
=1,2 ..., m, wherein m is the integer more than or equal to 3, the tie point a2 ends of the AC port P2, tie point b2 ends it
Between connect by electric capacity CL(m+1)With resistance RL(m+1)RC circuits in series, and resistance RC1；
The multistage decay channel module of the carrier signal includes：From the tie point a1 ends of the AC port P1 to the friendship
The c circuits at the tie point a2 ends of flow port P2, install the electric capacity C being sequentially connected in series on the c circuitsH1, resistance RH1, resistance RH2, electricity
Hold CH2；
The multistage decay channel module of the carrier signal includes：From the tie point b1 ends of the AC port P1 to the friendship
The d circuits at the tie point b2 ends of flow port P2, install the electric capacity C being sequentially connected in series on the d circuitsH3, resistance RH3, resistance RH4, electricity
Hold CH4；
The multistage decay channel module of the carrier signal includes：Variable resistor, one end of the variable resistor is connected to electricity
Resistance RH1With resistance RH2Between, the other end of the variable resistor is connected to resistance RH3With resistance RH4Between.
Optionally, the electric capacity CH1With the electric capacity CH2Correspond to respectively afterwards and access coupling transformer TH1Primary side two ends in
Each one end, coupling transformer TH1Secondary c1 and d1 two ends between successively 1st grade of decay path in parallel, the 2nd grade of decay path,
Two wiring points after to n-th grade of decay path, correspond to access coupling transformer T respectivelyH2Secondary c2 ends, d2 ends, coupling become
Depressor TH2Primary side two ends in each one end correspond to access series capacitance C respectivelyH3And CH4Afterwards the a2 ends of connection AC port P2 and
B2 ends；
Each described decay path, including two double-point double-throw switch WHjaAnd WHjb, described each decay path
Also include by resistance RHja、RHjc、RHjb、RHjdThe j-th stage series circuit ring of sequentially end to end composition, wherein j=1,2 ..., n,
In respective attenuation path：Resistance RHjcIt is connected in parallel on double-point double-throw switch WHjaFirst, second switching end between, double-point double-throw switch
WHjaThe three, the 4th switching terminal shortcircuits, double-point double-throw switch WHjaThe first common port concatenation double-point double-throw switch WH(j-1)a's
Second common port, double-point double-throw switch WHjaThe second common port concatenation double-point double-throw switch WH(j+1)aThe first common port, separately
Outward, double-point double-throw switch WH1aThe first common port concatenation coupling transformer TH1Secondary c1, double-point double-throw switch WHnaSecond
Common port concatenation coupling transformer TH2Secondary c2；Resistance RHjdIt is connected in parallel on double-point double-throw switch WHjbThe three, the 4th switching ends
Between, double-point double-throw switch WHjbFirst, second switching terminal shortcircuit, double-point double-throw switch WHjbThe first common port concatenation double-pole
Commutator WH(j-1)bThe second common port, double-point double-throw switch WHjbThe second common port concatenation double-point double-throw switch WH(j+1)b's
First common port, double-point double-throw switch WH1bThe first common port concatenation coupling transformer TH1Secondary d1, double-point double-throw switch
WHnbThe second common port concatenation coupling transformer TH2Secondary d2.
Optionally, the b1 ends of the AC port P1 of the electric power low-pass filtering module to the b2 ends of AC port P2 are gone here and there successively
The inductance L for enteringNiShort-circuit line short circuit is used respectively, so as to constitute asymmetric loop.
Optionally, the multistage decay channel module of the carrier signal, coupling transformer TH1And TH2With identical no-load voltage ratio.
Optionally, the multistage decay channel module of the carrier signal, connects respectively from the a1 ends and b1 ends of AC port P1
Electric capacity CH1And CH2Access c1 and d1 two ends afterwards, c1 and d1 two ends the 1st grade of decay path in parallel, the 2nd grade of decay path, extremely successively
After n-th grade of decay path, c2 and d2 two ends and respectively series capacitance C are accessedH3And CH4Afterwards, the a2 ends of incoming transport port P2 and
B2 ends.
Optionally, kth level decay path in the multistage decay channel module of the carrier signal, wherein 1≤k≤n, resistance
RHkaAnd RHkbResistance it is identical, resistance RHkcAnd RHkdResistance it is identical.
Optionally, pth level decay path has dissymmetrical structure in the multistage decay channel module of the carrier signal, wherein
1≤p≤n, pth level decay path is included by resistance RHpa、RHpc、RHpbThe series circuit ring that order is connected and composed from beginning to end, pth level
Decay path also includes that double-pole double-throw switchs WHpa, resistance RHpcIt is connected in parallel on double-point double-throw switch WHpaFirst, second switching end
Between, double-point double-throw switch WHpaThe three, the 4th switching ends between short circuit, double-point double-throw switch WHpaThe first common port concatenation
Double-point double-throw switch WH(p-1)aThe second common port, double-point double-throw switch WHpaThe second common port concatenation double-point double-throw switch
WH(p+1)aThe first common port, double-point double-throw switch WH1aThe first common port connection coupling transformer TH1Secondary c1, double-pole is double
Throw switch WHnaThe second common port connection coupling transformer TH2Secondary c2, resistance RHpaWith resistance RHpbTie point access coupling
Close transformer TH1Secondary d1 and coupling transformer TH2Secondary d2 between wiring pathways on.
Optionally, r grades of decay path has dissymmetrical structure in the multistage decay channel module of the carrier signal, wherein
1≤r≤n, r grades of decay path is included by resistance RHra、RHrb、RHrdThe series circuit ring that order is connected and composed from beginning to end, r grades
Decay path also includes that double-pole double-throw switchs WHrb, resistance RHrdIt is connected in parallel on double-point double-throw switch WHrbThe three, the 4th switching ends
Between, double-point double-throw switch WHrbFirst, second switching end between short circuit；Double-point double-throw switch WHrbThe first common port concatenation
Double-point double-throw switch WH(r-1)bThe second common port, double-point double-throw switch WHrbThe second common port concatenation double-point double-throw switch
WH(r+1)bThe first common port, double-point double-throw switch WH1bThe first common port connection coupling transformer TH1Secondary d1, double-pole is double
Throw switch WHnbThe second common port connection coupling transformer TH2Secondary d2；Resistance RHraWith resistance RHrbTie point access coupling
Close transformer TH1Secondary c1 and coupling transformer TH2Secondary c2 between wiring pathways on.
Optionally, s grades of decay path is fixed attenuation path in the multistage decay channel module of the carrier signal, wherein
1≤s≤n, s grades of decay path is included by resistance RHsa、RHsc、RHsb、RHsdThe series circuit that order is connected and composed from beginning to end, 2
During≤s≤n-1, resistance RHscFirst end connection resistance RH(s-1)cThe second end, resistance RHscThe second end connection resistance RH(s+1)c
First end, resistance RH1cFirst end connection coupling transformer TH1Secondary c1, resistance RHncThe second end connection coupling transformation
Device TH2Secondary c2；In 2≤s≤n-1, resistance RHsdFirst end connection resistance RH(s-1)dThe second end, resistance RHsd
Two ends connect resistance RH(s+1)dFirst end, resistance RH1dFirst end connection coupling transformer TH1Secondary d1, resistance RHnd's
Second end connects coupling transformer TH2Secondary d2.
Optionally, t grades of decay path in the multistage decay channel module of the carrier signal, wherein 1≤t≤n：Resistance
RHtaAnd RHtbResistance it is identical, resistance RHta、RHtb、RHtcAnd RHtdMeet：
RL=RHia//(RHic+RHid+RHib//RL)
Wherein, resistance value RLIt is the matched impedance designs value of attenuator.
Fig. 2 is the circuit structure diagram of the broadband power line carrier signal multistage adjustable attenuator of the embodiment of the present invention, in Fig. 2
Electric power LPF part can be understood as electric power low-pass filtering module, and the multistage decay passage portion of carrier signal can be understood as
The multistage decay channel module of carrier signal.
The circuit operation principle of broadband power line carrier signal of the invention multistage adjustable attenuator is：By electric power low pass
Filtering part realizes normal conveying of the AC energy of low frequency from a port to another port, while blocking completely as far as possible
Broadband power line carrier signal reaches another port from a port；It is based further on the multistage decay passage portion of carrier signal
Transmission of the broadband power line carrier signal from a port to another port, but its attenuation rate are allowed by multistage decay combination
Realize regulation and control.Electric power LPF part is using typical multistage LC filter circuits, inductance LLiAnd LNiInductance value it is smaller,
Its impedance is very low under AC power frequency, ensure that behind one end of plant-grid connection multistage adjustable attenuator, in multistage adjustable damping
The device other end can provide the power within nominal designed value for load.The high frequency frequency of correspondence broadband carrier signal, inductance LLi
And LNiImpedance compare and be connected in parallel on electric capacity C between portiWith resistance RiImpedance it is much larger so that pass through Multilevel partial-pressure so that
It is greatly attenuated from the broadband carrier signal of one end input.If carrier signal VHinFrom the friendship of electric power LPF partial circuit
Flow port P1 is input into, and ignores load impedance influence, then the carrier wave that electric power LPF partial circuit is exported in AC port P2
Signal VHoutAttenuation rate compared to input can approximate calculation according to the following formula：
Attenuation rate DLFUnit be dB.
The multistage decay passage portion of the carrier signal of the embodiment of the present invention under the low frequency comprising AC power frequency, electric capacity CH1、
CH2、CH3And CH4Impedance it is very big, so assume responsibility for larger alternating voltage.CH1、CH2And CH3、CH4Between be that multistage decay is logical
Road, damping resistance RHia、RHib、RHic、RHidThe AC power frequency voltage for undertaking is small, and the power consumption of resistance is also corresponding smaller.Multistage decay
If path Live line Zero line correspondence branch road seals in non-zero resistance, multistage decay path two ends need not be using coupling transformation
Device.But, if the resistance that seals in of live wire or zero line correspondence branch road is zero, need to use coupling transformer.Decay path pair
Signal power carries out the necessary impedance matching of accurate decay, otherwise can form standing wave or reflection, so the input of decay path
To be matched with the output impedance of signal source, meanwhile, output end will be matched with load impedance.Therefore, input impedance, output impedance,
Load impedance and source output impedance are all equal, it is assumed that be RL.By taking single-stage decay path as an example, input impedance：
Zin=RHia//(RHic+RHid+RHib//RL)=RL,
If RHia=RHib=R1、RHic=RHid=R2, and RL=50, then have：
So, the attenuation rate N of single-stage decay path is：
Simultaneous formula (1), formula (2) can obtain N, R1、R2Correlation, realize to many of broadband power line carrier signal
The design of level adjustable damping network.Thus, have in the frequency range of present invention design correspondence broadband power line carrier signal steady
Fixed port Impedance RL.Meanwhile, the multistage attenuating structure reduction single-stage that the present invention passes through the multistage decay passage portion of carrier signal
The signal cross-talk problem decayed to high-frequency carrier signal.By the control of double-point double-throw switch, correspondence certain level decay gear is realized
Regulation and control, so as to realize the quantitatively regulating and controlling to carrier signal overall attenuation degree.
The circuit of the embodiment of the present invention, the circuit is realized while the low-frequency ac electric energy of transmission certain power is ensured
Broadband power line carrier signal to high frequency carries out multistage adjustable decay regulation and control, and decay quantitatively regulating and controlling is easier.
Embodiment 2
One circuit structure diagram of specific embodiment of the embodiment of the present invention is as shown in figure 3, electric power LPF in Fig. 3
Part can be understood as electric power low-pass filtering module, and it is multistage that the multistage decay passage portion of carrier signal can be understood as carrier signal
Decay channel module.Electric power LPF part between AC port P1 and AC port P2 is made up of 4 grades of LC filter circuits.
4 inductance L are sealed in successively from the a1 ends of AC port P1 to the a2 ends of AC port P2L1、LL2、LL3、LL4, and from exchange end
B1 ends to the b2 ends of AC port P2 of mouth P1 seal in 4 inductance L successivelyN1、LN2、LN3、LN4, the inductance value of these inductance is identical,
It is 400 μ H.The electricity that parallel connection is serially connected successively between corresponding node and a2 and b2 nodes between a1 and b1, inductance
Hold CLiWith resistance RLi, wherein i=1,2,3,4,5, and CL1=CL2=CL3=CL4=CL5=0.33 μ F, RL1=RL5=50 Ω, RL2
=RL3=RL4=2 Ω.Electric capacity discharge resistance R is parallel between a1 the and b1 ends of AC port P1C1=330k Ω.According to preceding
The theory analysis stated and calculating, are input into P2 outputs from AC port P1, and electric power LPF part is for AC power frequency signal
It is all-pass, the attenuation rate D of the broadband power line communication signal of correspondence 200kHz and the aboveLFReach -90dB.
The multistage decay passage portion of carrier signal distinguishes series capacitance C from the a1 ends of AC port P1 and b1 endsH1And CH2Afterwards
Access coupling transformer TH1Primary side two ends, coupling transformer TH11st grade of decay in parallel is logical successively at secondary c1 and d1 two ends
After road, the 2nd grade of decay path, 3rd level decay path and the 4th grade of decay path, coupling transformer T is accessedH2Secondary c2 and d2
Two ends, coupling transformer TH2Primary side two ends difference series capacitance CH3And CH4Afterwards, the a2 ends and b2 ends of incoming transport port P2.
Wherein, CH1=CH2=CH3=CH4=0.1 μ F, coupling transformer TH1And TH2No-load voltage ratio it is identical, be 1:1.1st grade of decay path
It is fixed 20dB decay path, by resistance RH1a、RH1c、RH1b、RH1dIt is sequentially connected in series, resistance RH1cAnd RH1dCarrier wave is sealed in respectively
Between the c1 to c2 and d1 to d2 of the multistage decay passage portion of signal, wherein RH1a=RH1b=61 Ω, RH1c=RH1d=124 Ω.
2nd grade of decay path be can switching the decay paths of the 5dB with dissymmetrical structure, by resistance RH2a、RH2b、RH2dIt is sequentially connected in series,
Resistance RH2dIt is connected in parallel on double-point double-throw switch WH2bA respective switching end, double-point double-throw switch WH2bAnother switching end it is short
Road, double-point double-throw switch WH2bCommon port seal in respectively between the d1 to d2 of the multistage decay passage portion of carrier signal, resistance
RH2aAnd RH2bTie point access c1 to c2 between, wherein RH2a=RH2b=178 Ω, RH2d=30 Ω.3rd level decay path be
Can switching with dissymmetrical structure 10dB decay path, by resistance RH3a、RH3c、RH3bIt is sequentially connected in series, resistance RH3cIt is connected in parallel on
Double-point double-throw switch WH3aA respective switching end, double-point double-throw switch WH3aAnother switching terminal shortcircuit, DPDT opens
Close WH3aCommon port seal in respectively between the c1 to c2 of the multistage decay passage portion of carrier signal, resistance RH3aAnd RH3bConnection
Point is accessed between d1 to d2, wherein RH3a=RH3b=96 Ω, RH3c=71 Ω.4th grade of decay path be can switching with right
Claim the 20dB decay paths of structure, by resistance RH4a、RH4c、RH4b、RH4dIt is sequentially connected in series, resistance RH4cAnd RH4dDouble-pole is connected in parallel on respectively
Commutator WH4aAnd WH4bA respective switching end, double-point double-throw switch WH4aAnd WH4bRespective another switching terminal shortcircuit,
Double-point double-throw switch WH4aAnd WH4bCommon port seal in the c1 to c2 and d1 to d2 of the multistage decay passage portion of carrier signal respectively
Between, wherein RH4a=RH4b=61 Ω, RH4c=RH4d=124 Ω.
To broadband power line carrier signal of the present invention multistage adjustable attenuator embodiment by 4 switch W of switchingH2b、WH3a、
WH4aAnd WH4bThe multistage adjustable damping control to broadband power line carrier signal is realized, the power line carrier signal of high frequency is defeated from P1
Enter to P2 outputs or P2 and be input to P1 outputs, its attenuation can be carried out in the range of -20dB to -55dB with the interval of 5dB
Stepping is adjusted.Specific decay gear and its attenuation are as shown in the table with the corresponding relation of 4 on off states.
The broadband power line carrier signal multistage adjustable attenuator embodiment circuit of the embodiment of the present invention, obtained from friendship
The attenuation rate that flow port P1 is input under exported to P2, each decay gear is as shown in Figure 4 with the curve that frequency changes.By curve
It can be seen that, the attenuator is all-pass state in 1kHz frequency range below, in 100kHz above by the different decay path of switching,
Realize the steady regulation of the differential declines rate to the broadband power line carrier signal of high frequency.Also, in broadband power line carrier
In the high band of the 1MHz to 30MHz that signal is concerned about, the multistage adjustable attenuator circuit decay rate curve of the embodiment of the present invention is put down
Smooth, attenuation rate changes not notable with frequency, it is adaptable to which the carrier signal to different operating frequency carries out attenuation test.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
Best explaining principle, practical application or the improvement to the technology in market of each embodiment, or make the art
Other those of ordinary skill are understood that each embodiment disclosed herein.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. the circuit of a kind of broadband power line carrier signal multistage adjustable attenuator, it is characterised in that the circuit is connected to friendship
Between flow port P1 and AC port P2, the AC port P1 includes tie point a1, tie point b1, the AC port P2 bags
A2 containing tie point, tie point b2, the circuit include：The multistage decay channel module of electric power low-pass filtering module, carrier signal；
The electric power low-pass filtering module includes：The AC port P2 is connected to from the tie point a1 ends of the AC port P1
Tie point a2 ends a circuits, a circuits are provided with the m inductance L for sealing in successivelyL1、LL2、…、LLm, wherein m be more than
Or the integer equal to 3；
The electric power low-pass filtering module includes：The AC port P2 is connected to from the tie point b1 ends of the AC port P1
Tie point b2 ends b circuits, the b circuits are provided with and the m inductance LL1、LL2、…、LLmM that one-to-one corresponding is sealed in
Inductance LN1、LN2、…、LNm；
The electric power low-pass filtering module includes：Inductance L on a circuitsLiElectrical energy inputs, right on the b circuits
The inductance L for answeringNiElectrical energy inputs between parallel connection by electric capacity CLiWith resistance RLiRC circuits in series, wherein, i=1,
2nd ..., m, wherein m are the integer more than or equal to 3, and the tie point a2 ends of the AC port P2, tie point b2 connect between end
Connect by electric capacity CL(m+1)With resistance RL(m+1)RC circuits in series, and resistance RC1；
The multistage decay channel module of the carrier signal includes：From the tie point a1 ends of the AC port P1 to the exchange end
The c circuits at the tie point a2 ends of mouth P2, install the electric capacity C being sequentially connected in series on the c circuitsH1, resistance RH1, resistance RH2, electric capacity
CH2；
The multistage decay channel module of the carrier signal includes：From the tie point b1 ends of the AC port P1 to the exchange end
The d circuits at the tie point b2 ends of mouth P2, install the electric capacity C being sequentially connected in series on the d circuitsH3, resistance RH3, resistance RH4, electric capacity
CH4；
The multistage decay channel module of the carrier signal includes：Variable resistor, one end of the variable resistor is connected to resistance RH1
With resistance RH2Between, the other end of the variable resistor is connected to resistance RH3With resistance RH4Between.
2. circuit according to claim 1, it is characterised in that the electric capacity CH1With the electric capacity CH2Correspond to respectively afterwards and access
Coupling transformer TH1Primary side two ends in each one end, coupling transformer TH1Secondary c1 and d1 two ends between successively the in parallel 1st
Level decay path, the 2nd grade of decay path, to two wiring points after n-th grade of decay path, correspond to access coupling transformer respectively
TH2Secondary c2 ends, d2 ends, coupling transformer TH2Primary side two ends in each one end correspond to access series capacitance C respectivelyH3And CH4
The a2 ends and b2 ends of AC port P2 are connected afterwards；
Each described decay path, including two double-point double-throw switch WHjaAnd WHjb, described each decay path also wraps
Include by resistance RHja、RHjc、RHjb、RHjdThe j-th stage series circuit ring of sequentially end to end composition, wherein j=1,2 ..., n, accordingly
In decay path：Resistance RHjcIt is connected in parallel on double-point double-throw switch WHjaFirst, second switching end between, double-point double-throw switch WHja
The three, the 4th switching terminal shortcircuits, double-point double-throw switch WHjaThe first common port concatenation double-point double-throw switch WH(j-1)aSecond
Common port, double-point double-throw switch WHjaThe second common port concatenation double-point double-throw switch WH(j+1)aThe first common port, in addition, double
Double-pole double throw switch WH1aThe first common port concatenation coupling transformer TH1Secondary c1, double-point double-throw switch WHnaThe second common port
Concatenation coupling transformer TH2Secondary c2；Resistance RHjdIt is connected in parallel on double-point double-throw switch WHjbThe three, the 4th switching ends between, it is double
Double-pole double throw switch WHjbFirst, second switching terminal shortcircuit, double-point double-throw switch WHjbThe first common port concatenation DPDT open
Close WH(j-1)bThe second common port, double-point double-throw switch WHjbThe second common port concatenation double-point double-throw switch WH(j+1)bIt is first public
Hold altogether, double-point double-throw switch WH1bThe first common port concatenation coupling transformer TH1Secondary d1, double-point double-throw switch WHnb
Two common ports concatenation coupling transformer TH2Secondary d2.
3. circuit according to claim 1, it is characterised in that the b1 of the AC port P1 of the electric power low-pass filtering module
Hold the inductance L sealed in successively to the b2 ends of AC port P2NiShort-circuit line short circuit is used respectively, so as to constitute asymmetric loop.
4. circuit according to any one of claim 1 to 3, it is characterised in that the multistage decay path of the carrier signal
Module, coupling transformer TH1And TH2With identical no-load voltage ratio.
5. circuit according to claim 1, it is characterised in that the multistage decay channel module of the carrier signal, from exchange
Series capacitance C is distinguished at the a1 ends of port P1 and b1 endsH1And CH2C1 and d1 two ends are accessed afterwards, c1 and d1 two ends are in parallel 1st grade successively
Decay path, the 2nd grade of decay path, to after n-th grade of decay path, access c2 and d2 two ends and distinguish series capacitance CH3And CH4
Afterwards, the a2 ends and b2 ends of incoming transport port P2.
6. circuit according to claim 1, it is characterised in that kth level in the multistage decay channel module of the carrier signal
Decay path, wherein 1≤k≤n, resistance RHkaAnd RHkbResistance it is identical, resistance RHkcAnd RHkdResistance it is identical.
7. circuit according to claim 1, it is characterised in that pth level in the multistage decay channel module of the carrier signal
Decay path has dissymmetrical structure, wherein 1≤p≤n, pth level decay path is including by resistance RHpa、RHpc、RHpbOrder head and the tail
The series circuit ring for connecting and composing, pth level decay path also includes that double-pole double-throw switchs WHpa, resistance RHpcIt is connected in parallel on double-pole double
Throw switch WHpaFirst, second switching end between, double-point double-throw switch WHpaThe three, the 4th switching ends between short circuit, double-pole
Commutator WHpaThe first common port concatenation double-point double-throw switch WH(p-1)aThe second common port, double-point double-throw switch WHpa
Two common ports concatenation double-point double-throw switch WH(p+1)aThe first common port, double-point double-throw switch WH1aThe first common port connection coupling
Close transformer TH1Secondary c1, double-point double-throw switch WHnaThe second common port connection coupling transformer TH2Secondary c2, resistance
RHpaWith resistance RHpbTie point access coupling transformer TH1Secondary d1 and coupling transformer TH2Secondary d2 between line
On path.
8. circuit according to claim 1, it is characterised in that r grades in the multistage decay channel module of the carrier signal
Decay path has dissymmetrical structure, wherein 1≤r≤n, r grades of decay path is including by resistance RHra、RHrb、RHrdOrder head and the tail
The series circuit ring for connecting and composing, r grades of decay path also includes that double-pole double-throw switchs WHrb, resistance RHrdIt is connected in parallel on double-pole double
Throw switch WHrbThe three, the 4th switching ends between, double-point double-throw switch WHrbFirst, second switching end between short circuit；Double-pole
Commutator WHrbThe first common port concatenation double-point double-throw switch WH(r-1)bThe second common port, double-point double-throw switch WHrb
Two common ports concatenation double-point double-throw switch WH(r+1)bThe first common port, double-point double-throw switch WH1bThe first common port connection coupling
Close transformer TH1Secondary d1, double-point double-throw switch WHnbThe second common port connection coupling transformer TH2Secondary d2；Resistance
RHraWith resistance RHrbTie point access coupling transformer TH1Secondary c1 and coupling transformer TH2Secondary c2 between line
On path.
9. circuit according to claim 1, it is characterised in that s grades is declined in the multistage decay channel module of the carrier signal
Subtract path for fixed attenuation path, wherein 1≤s≤n, s grades of decay path is including by resistance RHsa、RHsc、RHsb、RHsdOrder is first
The series circuit that tail is connected and composed, in 2≤s≤n-1, resistance RHscFirst end connection resistance RH(s-1)cThe second end, resistance
RHscThe second end connection resistance RH(s+1)cFirst end, resistance RH1cFirst end connection coupling transformer TH1Secondary c1, electricity
Resistance RHncThe second end connection coupling transformer TH2Secondary c2；In 2≤s≤n-1, resistance RHsdFirst end connection resistance
RH(s-1)dThe second end, resistance RHsdThe second end connection resistance RH(s+1)dFirst end, resistance RH1dFirst end connection coupling become
Depressor TH1Secondary d1, resistance RHndThe second end connection coupling transformer TH2Secondary d2.
10. circuit according to claim 1, it is characterised in that t grades is declined in the multistage decay channel module of the carrier signal
Subtract path, wherein 1≤t≤n：Resistance RHtaAnd RHtbResistance it is identical, resistance RHta、RHtb、RHtcAnd RHtdMeet：
RL=RHia//(RHic+RHid+RHib//RL)
Wherein, resistance value RLIt is the matched impedance designs value of attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041605.9A CN106788609A (en) | 2017-01-20 | 2017-01-20 | The circuit of broadband power line carrier signal multistage adjustable attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041605.9A CN106788609A (en) | 2017-01-20 | 2017-01-20 | The circuit of broadband power line carrier signal multistage adjustable attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106788609A true CN106788609A (en) | 2017-05-31 |
Family
ID=58944853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710041605.9A Pending CN106788609A (en) | 2017-01-20 | 2017-01-20 | The circuit of broadband power line carrier signal multistage adjustable attenuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106788609A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932761A (en) * | 2019-12-12 | 2020-03-27 | 国网湖北省电力有限公司计量中心 | Power line broadband carrier attenuator |
| CN115085768A (en) * | 2022-08-24 | 2022-09-20 | 广东金朋科技有限公司 | Power line noise separation isolation frame |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827415A (en) * | 1981-08-10 | 1983-02-18 | Matsushita Electric Ind Co Ltd | Variable attenuator |
| US5347239A (en) * | 1992-12-03 | 1994-09-13 | Hewlett-Packard Company | Step attenuator |
| KR19990080428A (en) * | 1998-04-16 | 1999-11-05 | 김영환 | Digital controlled variable attenuator |
| JP2007027929A (en) * | 2005-07-13 | 2007-02-01 | Nippon Antenna Co Ltd | Switching circuit and attenuator |
| CN101558559A (en) * | 2007-08-11 | 2009-10-14 | 阎跃军 | Variable attenuator |
| TW200950204A (en) * | 2008-05-30 | 2009-12-01 | Yue-Jun Yan | Variable attenuator |
| CN103905089A (en) * | 2014-04-12 | 2014-07-02 | 盛吉高科（北京）科技有限公司 | Circuit of power line carrier signal adjustable attenuator |
| CN104917480A (en) * | 2015-06-19 | 2015-09-16 | 烟台东方威思顿电气股份有限公司 | Adjustable stepping passive attenuation circuit for test of power line carrier |
| CN105721225A (en) * | 2016-04-07 | 2016-06-29 | 上海斐讯数据通信技术有限公司 | Circuit and method for detecting state of far-end network device |
| CN105954593A (en) * | 2016-05-18 | 2016-09-21 | 中国电子科技集团公司第四十研究所 | Attenuation piece characteristic impedance and attenuation amount measurement system and method |
| CN206865455U (en) * | 2017-01-20 | 2018-01-09 | 许昌许继昌南通信设备有限公司 | The circuit of broadband power line carrier signal multistage adjustable attenuator |
-
2017
- 2017-01-20 CN CN201710041605.9A patent/CN106788609A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827415A (en) * | 1981-08-10 | 1983-02-18 | Matsushita Electric Ind Co Ltd | Variable attenuator |
| US5347239A (en) * | 1992-12-03 | 1994-09-13 | Hewlett-Packard Company | Step attenuator |
| KR19990080428A (en) * | 1998-04-16 | 1999-11-05 | 김영환 | Digital controlled variable attenuator |
| JP2007027929A (en) * | 2005-07-13 | 2007-02-01 | Nippon Antenna Co Ltd | Switching circuit and attenuator |
| CN101558559A (en) * | 2007-08-11 | 2009-10-14 | 阎跃军 | Variable attenuator |
| TW200950204A (en) * | 2008-05-30 | 2009-12-01 | Yue-Jun Yan | Variable attenuator |
| CN103905089A (en) * | 2014-04-12 | 2014-07-02 | 盛吉高科（北京）科技有限公司 | Circuit of power line carrier signal adjustable attenuator |
| CN104917480A (en) * | 2015-06-19 | 2015-09-16 | 烟台东方威思顿电气股份有限公司 | Adjustable stepping passive attenuation circuit for test of power line carrier |
| CN105721225A (en) * | 2016-04-07 | 2016-06-29 | 上海斐讯数据通信技术有限公司 | Circuit and method for detecting state of far-end network device |
| CN105954593A (en) * | 2016-05-18 | 2016-09-21 | 中国电子科技集团公司第四十研究所 | Attenuation piece characteristic impedance and attenuation amount measurement system and method |
| CN206865455U (en) * | 2017-01-20 | 2018-01-09 | 许昌许继昌南通信设备有限公司 | The circuit of broadband power line carrier signal multistage adjustable attenuator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932761A (en) * | 2019-12-12 | 2020-03-27 | 国网湖北省电力有限公司计量中心 | Power line broadband carrier attenuator |
| CN110932761B (en) * | 2019-12-12 | 2021-05-25 | 国网湖北省电力有限公司计量中心 | Power line broadband carrier attenuator |
| CN115085768A (en) * | 2022-08-24 | 2022-09-20 | 广东金朋科技有限公司 | Power line noise separation isolation frame |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU695672B2 (en) | Erasure detection in data streams | |
| CN108292911A (en) | Low phase shift high frequency attenuator | |
| CN206865455U (en) | The circuit of broadband power line carrier signal multistage adjustable attenuator | |
| CN106788609A (en) | The circuit of broadband power line carrier signal multistage adjustable attenuator | |
| US6400772B1 (en) | Line interface and method for detecting and eliminating an impedance mismatch between a transceiver and a transmission line | |
| Van Rensburg et al. | Coupling circuitry: Understanding the functions of different components | |
| CN109742497A (en) | A kind of four port reflectionless filter of transmission line | |
| CN103905089A (en) | Circuit of power line carrier signal adjustable attenuator | |
| US8005206B1 (en) | VDSL splitter | |
| CN104506158B (en) | A kind of analog bandpass filter | |
| CN102075156A (en) | System and method for wideband high current RF choke network | |
| US6566947B2 (en) | Combined active impedance and filter in line drivers | |
| US2337965A (en) | Coupling network | |
| JP4729455B2 (en) | Filter circuit | |
| CN106033972B (en) | A kind of electronic equipment | |
| EP2061158A1 (en) | Hybrid circuit without inductors | |
| US9641221B2 (en) | Electrical device for multiple-signal injection onto multiple-conductor communications medium | |
| CN106534007A (en) | Analog equalizer, communication interface and chip | |
| US1615252A (en) | Electrical wave filter | |
| US6754288B2 (en) | Line receiver with improved dynamic range | |
| CN106033954B (en) | A kind of antenna combiner | |
| KR102371761B1 (en) | Filter for power line communication | |
| US3641271A (en) | Resonant transfer circuits | |
| US2041098A (en) | Wave transmission network | |
| CN107733469A (en) | A kind of power wire broadband carrier communication anti-jamming circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |