CN105071835B - A kind of bandwidth carrier communication attenuator circuit and termination power - Google Patents
A kind of bandwidth carrier communication attenuator circuit and termination power Download PDFInfo
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Abstract
The invention discloses a kind of bandwidth carrier communication attenuator circuit and termination power, wherein, which includes：Discharge resistance, adjustable resistance, safety capacitance, the first frequency selection circuit, the second frequency selection circuit, first input end, the second input terminal, the first output terminal and second output terminal；First input end is connected by the first frequency selection circuit with the first output terminal, and the second input terminal is connected by the second frequency selection circuit with second output terminal；One end of discharge resistance is connected with first input end, and the other end is connected with the second input terminal；One end of safety capacitance is connected with the first output terminal, and the other end is connected by adjustable resistance with second output terminal；First frequency selection circuit and the second frequency selection circuit are included all the way to channelized frequencies branch, and every frequency branch all the way is used to gate the signal of predeterminated frequency scope.The attenuator circuit can realize it is undistorted by power frequency component, substantially it is undistorted attenuation 2 34MHz broadband carrier signals, only attenuation do not influence signal characteristic.
Description
Technical field
The present invention relates to technical field of electric power communication, and in particular, to a kind of bandwidth carrier communication attenuator circuit and coupling
Circuit.
Background technology
Power line communication (Power Line Communication) technology abbreviation PLC refers to utilize power line transmission number
According to a kind of communication mode.Channel is the carrier or physical medium that communication equipment carries out data transmission, the characteristic and feature of channel
It is the important evidence of design of communication equipments, changing rule and the feature for grasping channel are extremely important.Power line be one it is non-linear,
Time-varying, non-dedicated communication channel, the rule and feature of research and grasp power line communication channel are to exploitation carrier communication equipment tool
It is necessary to property.
Power wire broadband carrier is based on TCP/IP network technologies, generally using 2-34MHz frequency ranges, occupied bandwidth, data
Transmission rate is high, and data capacity is big, transmitted in both directions, easy for installation without being in addition laid with communication line, it may be convenient to by electric power
Communication network extends to low-voltage customer side, realizes the data acquisition and control to electric supply meter.It to be realized on power line reliable
Communication, it is necessary to be fully understood by the characteristic of power line channel.Attenuation and coupling unit are works important in power line channel research
Tool.Attenuation units, which can be realized, decays to high-power signal, on the one hand can protect back end test equipment, can also be used to
Carry out attenuation characteristic experiment；Coupling unit can realize the injection of power line carrier signal.But it declines at present in field of power communication
The design for subtracting device and coupler not yet forms unified technical specification, is not directly applied for the related side of bandwidth carrier communication
Method.
At present there are mainly two types of the test methods of power line channel characteristic：First method is to use spectrum analyzer, directly
Obtain the spectral characteristic for taking power line signal；Second method is using digital storage oscilloscope, first the time-domain information of signal
It after storage, is transmitted in computer, then carries out spectrum estimation, obtain the spectral characteristic of signal.No matter which kind of mode, on power line
Signal need safely to be introduced into spectrum analyzer or digital storage oscilloscope.But since power line environment is complicated, signal
Varied, amplitude height is different, if directly tested test equipment access power grid, it is possible to burn instrument, need
It is specially adapted for coupling and the attenuation units of 2-34MHz frequency ranges, appropriate frequency, the electric power for being suitble to terminal device amplitude can be exported
Signal.
The content of the invention
The present invention is in order to overcome the attenuator circuit for not being directly applied for bandwidth carrier communication in the prior art, according to this
The one side of invention proposes a kind of bandwidth carrier communication attenuator circuit.
A kind of bandwidth carrier communication attenuator circuit provided in an embodiment of the present invention, including：Discharge resistance, adjustable resistance, peace
Advise capacitance, the first frequency selection circuit, the second frequency selection circuit, first input end, the second input terminal, the first output terminal and the second output
End；
First input end is connected by the first frequency selection circuit with the first output terminal, and the second input terminal passes through the second frequency selection circuit
It is connected with second output terminal；
One end of discharge resistance is connected with first input end, and the other end is connected with the second input terminal；One end of safety capacitance
It is connected with the first output terminal, the other end is connected by adjustable resistance with second output terminal；
First frequency selection circuit and the second frequency selection circuit include being used for per frequency branch all the way to channelized frequencies branch all the way
Gate the signal of predeterminated frequency scope.
In the above-mentioned technical solutions, the first frequency selection circuit and the second frequency selection circuit include two-way frequency branch, the first choosing
Frequency circuit includes first resistor in parallel and the first inductance, and the second frequency selection circuit includes second resistance in parallel and the second inductance；
By being connected after first resistor and the first inductance in parallel with the first output terminal, the second input terminal leads to first input end
It is connected after crossing second resistance in parallel and the second inductance with second output terminal.
In the above-mentioned technical solutions, the structure of the first frequency selection circuit and the second frequency selection circuit is identical.
In the above-mentioned technical solutions, when the structure of the first frequency selection circuit and the second frequency selection circuit is identical, attenuator circuit
Pad value is：
Wherein, A is the pad value of attenuator circuit, and f is signal frequency, R2For the resistance value of adjustable resistance, R3For first resistor
Resistance value, L are the resistance value of the first inductance, and C is the resistance value of safety capacitance.
In the above-mentioned technical solutions, first resistor and second resistance are fixed carbon resister.
In the above-mentioned technical solutions, attenuator circuit is the attenuator circuit that can be cascaded in series for.
A kind of bandwidth carrier communication attenuator circuit provided in an embodiment of the present invention, the first frequency selection circuit and the second frequency selection circuit
Including channelized frequencies branch, while the signal of predeterminated frequency scope is gated, also there is deamplification, in attenuation electricity
Road have two-way frequency branch when can realize it is undistorted by power frequency component, substantially it is undistorted attenuation 2-34MHz bandwidth carriers
Signal, only attenuation do not influence signal characteristic.
The present invention is in order to overcome the termination power for not being directly applied for bandwidth carrier communication in the prior art, according to this
The one side of invention proposes a kind of bandwidth carrier communicatmgiy coupling circuitry.
A kind of termination power provided in an embodiment of the present invention, including：Discharge resistance, adjustable resistance, the first frequency selection circuit,
Two frequency selection circuits, first input end, the second input terminal, the first output terminal and second output terminal；
First input end is connected by the first frequency selection circuit with the first output terminal, and the second input terminal passes through the second frequency selection circuit
It is connected with second output terminal；
One end of discharge resistance is connected with first input end, and the other end is connected with the second input terminal；One end of adjustable resistance
It is connected with the first output terminal, the other end is connected with second output terminal；
First frequency selection circuit and the second frequency selection circuit are used to isolate power frequency component.
In the above-mentioned technical solutions, the first frequency selection circuit includes first resistor in parallel and the first capacitance, the second frequency-selecting electricity
Road includes second resistance in parallel and the second capacitance；
By being connected after first resistor and the first capacitance in parallel with the first output terminal, the second input terminal leads to first input end
It is connected after crossing second resistance in parallel and the second capacitance with second output terminal.
In the above-mentioned technical solutions, first resistor and second resistance are perceptual resistance.
In the above-mentioned technical solutions, the first frequency selection circuit further includes the first inductance, after the first inductance is connected with first resistor
It is in parallel with the first capacitance；
Second frequency selection circuit further includes the second inductance, and the second inductance is in parallel with the second capacitance after connecting with second resistance.
A kind of bandwidth carrier communicatmgiy coupling circuitry provided in an embodiment of the present invention, the first frequency selection circuit and the second frequency selection circuit
Power frequency component can be isolated, so as to beneficial to coupling broadband carrier signal；Meanwhile the termination power can realize isolation power frequency letter
Number, it is undistorted, undamped by 2-34MHz broadband carrier signals, do not influence signal characteristic.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and attached drawing.
Below by drawings and examples, technical scheme is described in further detail.
Description of the drawings
Attached drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Example is applied together for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the first circuit diagram of attenuator circuit in the embodiment of the present invention；
Fig. 2 is the second circuit figure of attenuator circuit in the embodiment of the present invention；
Fig. 3 is the circuit diagram of attenuator circuit in embodiment one；
Fig. 4 is attenuator circuit 220V/50Hz power frequency component equivalent circuit diagrams in embodiment one；
Fig. 5 is attenuator circuit broadband carrier signal equivalent circuit diagram in embodiment one；
Fig. 6 is the amplitude versus frequency characte analogous diagram of attenuator circuit in embodiment one；
Fig. 7 is the group delay analogous diagram of attenuator circuit in embodiment one；
Fig. 8 is the power frequency component analogous diagram of attenuator circuit in embodiment one；
Fig. 9 is the schematic diagram that swept-frequency signal is inputted in embodiment one；
Figure 10 is the schematic diagram that swept-frequency signal is exported in embodiment one；
Figure 11 is the first circuit diagram of termination power in the embodiment of the present invention；
Figure 12 is the second circuit figure of termination power in the embodiment of the present invention；
Figure 13 is the circuit diagram of termination power in embodiment two；
Figure 14 is the amplitude versus frequency characte analogous diagram of termination power in embodiment two；
Figure 15 is the group delay analogous diagram of termination power in embodiment two；
Figure 16 is the power frequency component analogous diagram of termination power in embodiment two；
Figure 17 is the schematic diagram that swept-frequency signal is inputted in embodiment two；
Figure 18 is the schematic diagram that swept-frequency signal is exported in embodiment two；
Figure 19 is termination power actual test output waveform figure in embodiment two.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not restricted by specific implementation.
A kind of bandwidth carrier communication attenuator circuit provided in an embodiment of the present invention is shown in Figure 1, which includes：
Discharge resistance R1, adjustable resistance R2, safety capacitance C1, the first frequency selection circuit 10, the second frequency selection circuit 20, first input end In_
1st, the second input terminal In_2, the first output terminal Out_1 and second output terminal Out_2.
As shown in Figure 1, first input end In_1 is connected by the first frequency selection circuit 10 with the first output terminal Out_1, second
Input terminal In_2 is connected by the second frequency selection circuit 20 with second output terminal Out_2.One end of discharge resistance R1 and the first input
End In_1 is connected, and the other end is connected with the second input terminal In_2；One end of safety capacitance C1 is connected with the first output terminal Out_1,
The other end is connected by adjustable resistance R2 with second output terminal Out_2.
Wherein, the first frequency selection circuit 10 and the second frequency selection circuit 20 include all the way to channelized frequencies branch (with two in Fig. 1
Exemplified by the frequency branch of road), every frequency branch all the way is used to gate the signal of predeterminated frequency scope.
A kind of bandwidth carrier communication attenuator circuit provided in an embodiment of the present invention, first input end and the second input terminal are used for
Initial signal is inputted, which includes at least broadband carrier signal, can also be including power frequency component etc..First frequency selection circuit
Include channelized frequencies branch with the second frequency selection circuit, while the signal of gating (i.e. selectivity passes through) predeterminated frequency scope,
Also there is deamplification, specific pad value is described in detail below.Initial signal passes through the first frequency selection circuit 10
It can pass through setting 10 He of the first frequency selection circuit in the signal after two output output attenuatoins with after the second frequency selection circuit 20
Second frequency selection circuit 20 can obtain required deamplification.
Discharge resistance R1 is the resistance of high value, is mainly used for safety capacitance C1 electric discharges, safety capacitance when preventing from powering off
Electric discharge damages human body.Simultaneously as discharge resistance R1 is high resistance measurement, do not have substantially to the attenuation characteristic of the circuit
Have an impact, do not consider discharge resistance R1 in follow-up calculating in embodiments of the present invention.
Specifically, the output resistance of the attenuator circuit is：
Wherein, RCFor the resistance value of safety capacitance C1, C is the capacitance of safety capacitance C1, R2For the resistance value of adjustable resistance.
If the equivalent resistance of the first frequency selection circuit 10 is Re1, the equivalent resistance of the second frequency selection circuit 20 is Re2, then decays
The pad value of circuit is：
Wherein, A be attenuator circuit pad value, UoFor the output voltage of output terminal, UiFor your input voltage of input terminal.
It should be noted that in the embodiment of the present invention, " adjustable resistance " means that the resistance value of resistance R2 is not fixed, you can adjusts
Resistance R2 can select the fixed resistance of resistance value or directly select variable resistor, and the fixed electricity of resistance value is selected in adjustable resistance R2
During resistance, the resistance of other resistance values can be replaced according to actual demand.Therefore the scope included by " adjustable resistance " is more than variable resistor
, similarly, adjustable resistance R2 is not represented with the symbol of variable resistor yet in Fig. 1.
Preferably, shown in Figure 2, the first frequency selection circuit 10 and the second frequency selection circuit 20 include two-way frequency branch,
First frequency selection circuit 10 includes first resistor R3 and the first inductance L1 in parallel, and the second frequency selection circuit 20 includes the second electricity in parallel
Hinder R4 and the second inductance L2.By taking the first frequency selection circuit as an example, first resistor R3 is frequency branch all the way, and the first inductance L1 is another
Road frequency branch.
First input end In_1 pass through after in parallel first resistor R3 and the first inductance L1 with the first output terminal Out_1 phases
Even, the second input terminal In_2 after second resistance R4 and the second inductance L2 in parallel with second output terminal Out_2 by being connected.
Preferably, the first frequency selection circuit 10 is identical with the structure of the second frequency selection circuit 20.By setting two structures identical
Frequency selection circuit, can be with the transmission characteristic of balanced signal, beneficial to steady transmission of signal.
The function of the attenuator circuit is discussed in detail below by one embodiment.
Embodiment one
Shown in Figure 3 in embodiment one, two frequency selection circuits of the attenuator circuit are respectively provided with two-way frequency branch,
It is essentially identical with attenuator circuit shown in Fig. 2；The difference is that in embodiment one, the first frequency selection circuit 10 and second
The structure of frequency selection circuit 20 is identical.The input terminal input power line signal of attenuator circuit, the power line signal are 220V/50Hz works
Frequency and the signal of 2-34MHz bandwidth carriers superposition.
At this point, the output resistance of attenuator circuit is：
First frequency selection circuit 10 is identical with the equivalent resistance of the second frequency selection circuit 20, is：
Wherein, ReFor the resistance value of frequency selection circuit, R3For the resistance value of first resistor R3, RLFor the resistance value of the first inductance L1, L is
The inductance value of first inductance L1, f are signal frequency.
At this point, the pad value of the attenuator circuit is：
Wherein, A be attenuator circuit pad value, R2For the resistance value of adjustable resistance R2, C is the resistance value of safety capacitance C1.
Wherein, in embodiment one, signal that power line signal is superimposed for 220V/50Hz power frequencies and bandwidth carrier, Fig. 3 institutes
The attenuator circuit shown can be equivalent to the circuit shown in Fig. 4 and Fig. 5, when wherein Fig. 4 is by 220V/50Hz power frequency components etc.
Circuit is imitated, Fig. 5 is equivalent circuit when passing through broadband carrier signal.
Since the high frequency characteristics of inductance and capacitance is relatively preferable, and the frequency characteristic of resistance has larger shadow to attenuation flatness
It rings, metalfilmresistor frequency characteristic is poor, and therefore, in embodiment one, first resistor R3 and second resistance R4 are (i.e. the in Fig. 3
R3 in two frequency selection circuits) it is the relatively good fixed carbon resister of frequency characteristic.Meanwhile adjusting adjustable resistance R2 resistance values can change
Pad value, and the attenuator circuit can be in parallel, realizes multistage attenuation.The attenuator circuit can be realized undistorted to be believed by power frequency
Number, substantially undistorted attenuating broadband carrier signal, the characteristic of the circuit is described in detail below.
First, emulation testing is carried out to the attenuator circuit in embodiment one, the resistance value of adjustable resistance R2 is 50 Ω, and emulation is tied
Fruit is referring to shown in Fig. 6-8；Wherein, Fig. 6 is the amplitude versus frequency characte analogous diagram of the attenuator circuit, and Fig. 7 is the group delay of the attenuator circuit
Analogous diagram, Fig. 8 are the power frequency component analogous diagram of the attenuator circuit.It will be appreciated from fig. 6 that the attenuator circuit to 50Hz power frequency components without declining
Subtract, 2~34MHz frequency ranges attenuation about 14dB.As shown in Figure 7,2~34MHz frequency bands group delay about 0s, meanwhile, attenuation electricity
Road has comparatively ideal attenuation flatness and undistorted phase-frequency characteristic for 2~34MHz signals.Circuit wink as shown in Figure 8
State the simulation results are understood, in addition to the starting stage, the attenuator circuit is substantially undistorted to power frequency component and attenuation.
The actual test result to the attenuator circuit is described in detail below.
In embodiment one, the sine sweep signal of 2MHz~34MHz is generated using signal generator, accesses declining for test
Subtract circuit input end, using spectrum analyzer while collecting test circuit input and output side swept-frequency signal.
For broadband carrier signal, input swept-frequency signal and output swept-frequency signal are respectively referring to shown in Fig. 9 and Figure 10.By
Test result understands that the opposite input swept-frequency signal of output swept-frequency signal has the attenuation of about 13dB, basically identical with simulation result.
For power frequency component, during actual test, which is accessed into 220VAC, is measured using universal meter defeated
Outlet, output is identical with input power frequency component virtual value, consistent with simulation result.
A kind of bandwidth carrier communication attenuator circuit provided in an embodiment of the present invention, the first frequency selection circuit and the second frequency selection circuit
Including channelized frequencies branch, while the signal of predeterminated frequency scope is gated, also there is deamplification, in attenuation electricity
Road have two-way frequency branch when can realize it is undistorted by power frequency component, substantially it is undistorted attenuation 2-34MHz bandwidth carriers
Signal, only attenuation do not influence signal characteristic.
Based on same inventive concept, the embodiment of the present invention also provides a kind of bandwidth carrier communicatmgiy coupling circuitry, below in detail
Carefully introduce the 26S Proteasome Structure and Function of the termination power.
It is shown in Figure 11, a kind of bandwidth carrier communicatmgiy coupling circuitry provided in an embodiment of the present invention, including：Discharge resistance
R1, adjustable resistance R2, the first frequency selection circuit 10, the second frequency selection circuit 20, first input end In_1, the second input terminal In_2,
One output terminal Out_1 and second output terminal Out_2.
Wherein, first input end In_1 is connected by the first frequency selection circuit 10 with the first output terminal Out_1, the second input terminal
In_2 is connected by the second frequency selection circuit 20 with second output terminal Out_2；One end of discharge resistance R1 and first input end In_1
It is connected, the other end is connected with the second input terminal In_2；One end of adjustable resistance R2 is connected with the first output terminal Out_1, the other end
It is connected with second output terminal Out_2；Wherein, the first frequency selection circuit 10 and the second frequency selection circuit 20 are used to isolate power frequency component.
Preferably, shown in Figure 12, the first frequency selection circuit 10 includes first resistor R3 and the first capacitance C1 in parallel, the
Two frequency selection circuits 20 include second resistance R4 and the second capacitance C2 in parallel；First input end In_1 passes through first resistor in parallel
It is connected after R3 and the first capacitance C1 with the first output terminal Out_1, the second input terminal In_2 passes through second resistance R4 in parallel and the
It is connected after two capacitance C2 with second output terminal Out_2.Wherein, first resistor R3 and second resistance R4 is perceptual resistance.The coupling
Circuit can realize isolation power frequency component, undistorted, undamped to pass through broadband carrier signal.
The function of the termination power is discussed in detail below by one embodiment.
Embodiment two
It is shown in Figure 13 in embodiment two, the first frequency selection circuit 10 further include the first inductance L1, the first inductance L1 with
It is in parallel with the first capacitance C1 after first resistor R3 series connection；Second frequency selection circuit 20 further include the second inductance L2, the second inductance L2 with
It is in parallel with the second capacitance C2 after second resistance R4 series connection.Wherein, the first inductance L1 and the second inductance L2 be nH ranks, increase this two
The purpose of a inductance is to increase the induction reactance of first resistor R3 and second resistance R4, and (i.e. first resistor R3 and second resistance R4 is feel
Property resistance), and first resistor R3 and second resistance R4 are high resistance measurement, in embodiment two, first resistor R3 and second
The resistance value of resistance R4 is identical, is 1M Ω.The input terminal input power line signal of the termination power, the power line signal are
220V/50Hz power frequencies and the signal of 2-34MHz bandwidth carriers superposition.
The termination power that embodiment two provides can realize isolation power frequency component, undistorted, undamped to be carried by broadband
Ripple signal.The characteristic of the circuit is described in detail below.
First, emulation testing is carried out to the termination power in embodiment two, simulation result is referring to shown in Figure 14-16；Figure
14 be the amplitude versus frequency characte analogous diagram of the termination power, and Figure 15 is the group delay analogous diagram of the termination power, and Figure 16 is coupling electricity
The power frequency component analogous diagram (in Figure 16, curve 1 is the power frequency component of input, and curve 2 is output signal) on road.As shown in Figure 14,
The termination power decays to 50Hz power frequency components about -42dB, and 2~34MHz frequency ranges are substantially undamped..As shown in Figure 15,2
~34MHz frequency bands group delay about 0s, meanwhile, which has comparatively ideal passability and flat for 2~34MHz signals
Property and undistorted phase-frequency characteristic.Circuit Transient test result as shown in Figure 16 is understood, exports power frequency component peak value Vp
=2.5V, it is seen then that the termination power has greater attenuation to power frequency component.
The actual test result to the termination power is described in detail below.
In embodiment one, the sine sweep signal of 2MHz~34MHz is generated using signal generator, accesses the coupling of test
Circuit input end is closed, using spectrum analyzer while collecting test circuit input and output side swept-frequency signal.
For broadband carrier signal, input swept-frequency signal and output swept-frequency signal are respectively referring to shown in Figure 17 and Figure 18.
From test result, the opposite input swept-frequency signal of output swept-frequency signal has the attenuation of about 0.2dB, with simulation result basic one
It causes.
For power frequency component, during actual test, which is accessed into 220VAC, it is defeated using oscilloscope measurement
Outlet, test result is shown in Figure 19, and output effective value is about 1.8V, consistent with simulation result.
A kind of bandwidth carrier communicatmgiy coupling circuitry provided in an embodiment of the present invention, the first frequency selection circuit and the second frequency selection circuit
Power frequency component can be isolated, so as to beneficial to coupling broadband carrier signal；Meanwhile the termination power can realize isolation power frequency letter
Number, it is undistorted, undamped by 2-34MHz broadband carrier signals, do not influence signal characteristic.
It is of the invention can there are many various forms of specific embodiments, above by taking Fig. 1-Figure 19 as an example with reference to attached drawing to this hair
Bright technical solution explanation for example, this is not meant to that the specific example that the present invention is applied can only be confined to specific flow
Or in example structure, those of ordinary skill in the art are it is to be appreciated that specific embodiment presented above is a variety of
Some examples in its preferred usage, any embodiment for embodying the claims in the present invention should all be wanted in technical solution of the present invention
Within the scope of asking protection.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent substitution to which part technical characteristic.
Within the spirit and principles of the invention, any modifications, equivalent replacements and improvements are made should be included in the present invention's
Within protection domain.
Claims (5)
- The attenuator circuit 1. a kind of bandwidth carrier communicates, which is characterized in that including：Discharge resistance, adjustable resistance, safety capacitance, One frequency selection circuit, the second frequency selection circuit, first input end, the second input terminal, the first output terminal and second output terminal；The first input end is connected by first frequency selection circuit with first output terminal, and second input terminal passes through Second frequency selection circuit is connected with the second output terminal；One end of the discharge resistance is connected with the first input end, and the other end is connected with second input terminal；The peace One end of rule capacitance is connected with first output terminal, and the other end is connected by the adjustable resistance with the second output terminal；First frequency selection circuit and second frequency selection circuit are included all the way to channelized frequencies branch, per frequency described all the way Branch is used to gate the signal of predeterminated frequency scope；Wherein, first frequency selection circuit and second frequency selection circuit include two-way frequency branch, the first frequency-selecting electricity Road includes first resistor in parallel and the first inductance, and second frequency selection circuit includes second resistance in parallel and the second inductance；The first input end after first resistor and the first inductance in parallel with first output terminal by being connected, and described second Input terminal after second resistance and the second inductance in parallel with the second output terminal by being connected；First frequency selection circuit is identical with the structure of second frequency selection circuit, and the pad value of the attenuator circuit is：<mrow> <mi>A</mi> <mo>=</mo> <mn>20</mn> <mi>lg</mi> <mrow> <mo>|</mo> <mfrac> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mn>1</mn> <mrow> <mn>2</mn> <mi>&pi;</mi> <mi>f</mi> <mi>C</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> </mrow> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mn>1</mn> <mrow> <mn>2</mn> <mi>&pi;</mi> <mi>f</mi> <mi>C</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <mn>2</mn> <mfrac> <mrow> <mi>j</mi> <mn>2</mn> <mi>&pi;</mi> <mi>f</mi> <mi>L</mi> <mo>&CenterDot;</mo> <msub> <mi>R</mi> <mn>3</mn> </msub> </mrow> <mrow> <mi>j</mi> <mn>2</mn> <mi>&pi;</mi> <mi>f</mi> <mi>L</mi> <mo>+</mo> <msub> <mi>R</mi> <mn>3</mn> </msub> </mrow> </mfrac> </mrow> </mfrac> <mo>|</mo> </mrow> </mrow>Wherein, A is the pad value of attenuator circuit, and f is signal frequency, R2For the resistance value of adjustable resistance, R3For the resistance of first resistor Value, L are the resistance value of the first inductance, and C is the resistance value of safety capacitance.
- 2. attenuator circuit according to claim 1, which is characterized in that the first resistor and the second resistance are carbon film Resistance.
- 3. attenuator circuit according to claim 1, which is characterized in that the attenuator circuit is the attenuation electricity that can be cascaded in series for Road.
- 4. a kind of bandwidth carrier communicatmgiy coupling circuitry, which is characterized in that including：Discharge resistance, adjustable resistance, the first frequency-selecting electricity Road, the second frequency selection circuit, first input end, the second input terminal, the first output terminal and second output terminal；The first input end is connected by first frequency selection circuit with first output terminal, and second input terminal passes through Second frequency selection circuit is connected with the second output terminal；One end of the discharge resistance is connected with the first input end, and the other end is connected with second input terminal；It is described can One end of resistance is adjusted to be connected with first output terminal, the other end is connected with the second output terminal；First frequency selection circuit and second frequency selection circuit are used to isolate power frequency component；Wherein, first frequency selection circuit includes first resistor in parallel and the first capacitance, and second frequency selection circuit is included simultaneously The second resistance of connection and the second capacitance；The first input end after first resistor and the first capacitance in parallel with first output terminal by being connected, and described second Input terminal after second resistance and the second capacitance in parallel with the second output terminal by being connected；First frequency selection circuit further includes the first inductance, first inductance connect with the first resistor after with described first Capacitance is in parallel；Second frequency selection circuit further includes the second inductance, second inductance connect with the second resistance after with described second Capacitance is in parallel.
- 5. termination power according to claim 4, which is characterized in that the first resistor and the second resistance are perception Resistance.
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| CN1765061A (en) * | 2003-03-28 | 2006-04-26 | Tdk株式会社 | Power line terminating circuit and method, and power line relay device |
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