CN109167639B - A kind of bandwidth carrier common mode interference suppressing method and device - Google Patents
A kind of bandwidth carrier common mode interference suppressing method and device Download PDFInfo
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- CN109167639B CN109167639B CN201810950438.4A CN201810950438A CN109167639B CN 109167639 B CN109167639 B CN 109167639B CN 201810950438 A CN201810950438 A CN 201810950438A CN 109167639 B CN109167639 B CN 109167639B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/005—Reducing noise, e.g. humm, from the supply
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
Abstract
The present invention relates to a kind of bandwidth carrier common mode interference suppressing method and devices, this method receives firewire in circuit and in carrier signal transmitting line to carrier signal and ground wire is wound by mirror image respectively, it is identical around to opposite coil arranged side by side that firewire forms even number set the number of turns, ground wire forms identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side, common mode interference is reduced, module realizes to include that carrier signal receives circuit, carrier signal transmitting line and OFDM module；The firewire for sending carrier signal reception circuit and carrier signal reception circuit is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post is opposite, coil winding direction on i.e. each wrapping post is carried out with the first winding direction → second winding direction → first winding direction → second winding direction or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction, and influence caused by common mode interference signal can be effectively reduced in the present invention.
Description
Technical field
The present invention relates to bandwidth carrier fields, and in particular to a kind of bandwidth carrier common mode interference suppressing method and device.
Background technique
Power line carrier module uses power line as communication media, is not necessarily to independent wiring, carrier schemes are based at present
The centre frequency of 400KHz or so, is easy the interference by low frequency signal in power grid, and meter reading success rate is also constantly reducing.Closely
Bandwidth carrier design scheme based on OFDM modulation over year increases data bandwidth using the high-frequency signal of 2M-12MHz, number
The modulation system of change improves the receiving sensitivity of carrier wave, improves antimierophonic ability, but the bandwidth carrier of high frequency is to route
Resistance requirements are higher, rather low-frequency narrowband carrier, and loss of the bandwidth carrier on power line is but bigger.With large-size variable-frequency equipment
The increase of rectifier equipment, the rapid proliferation of Switching Power Supply, carrier module increases in power grid, causes the interference of power grid environment also more next
Bigger, the passband of copying of current carrier module is also constantly declining.
With the raising of carrier chip technique and performance, at present up to 120dBuV, carrier wave connects the transmission power of bandwidth carrier
The sensitivity of receipts has had reached 10dBuV, but the extraction circuit design of carrier signal still follows the substantially electric of narrowband scheme
Road design, relative to the low frequency and narrow bandwidth epoch, conventional extraction circuit brings biggish decaying and interference, therefore in actual use
Bandwidth carrier is other than the advantage in rate, and anti-interference ability and communication distance are not significantly improved, due to higher
Dominant frequency leads to bigger decaying, reduces the communication distance of bandwidth carrier, has seriously affected the application effect of bandwidth carrier.
The variation of voltage and current has two kinds of forms when passing through wire transmission, this is referred to as " common mode " and " differential mode " by us.If
The communication line of standby power supply line, phone etc., the communication line being exchanged with each other with other equipment or peripheral equipment, at least two are led
Line, this two conducting wires transmit electric power as round-trip route or signal.But the usual also third conductor except this two conducting wires, this
It is exactly " ground wire ".Interference voltage and electric current are divided into two kinds: one is two conducting wires respectively as round-trip line transmission；Another kind is
Two conducting wires do outlet, and ground wire returns loop transfer.The former cries " differential mode ", and the latter is " common mode ".For differential mode voltage, one is led
It is (voltage between lines)/2 on line, and on another conducting wire is-(voltage between lines)/2, thus is balance.But common-mode voltage two
It is identical on conducting wire.So two conducting wires are also different to the voltage of ground wire when both of which exists simultaneously.
The bandwidth carrier module coil of mainstream is using Double-wire parallel wound mode, common mode inductance (Common mode at present
Choke), it is also common mode choke, is usually used in filtering the electromagnetic interference signal of common mode in the Switching Power Supply of computer.It is designed in board
In, common mode inductance is also to play EMI filtering, and the electromagnetic wave outside radiation for inhibiting HW High Way to generate is sent.Altogether
The filter circuit of mould inductance, La and Lb are exactly common mode inductance coil.The two coils are wound on same iron core, and the number of turns and phase are all
Identical (coiling is reversed).In this way, when the normal current in circuit flows through common mode inductance, inductor wire of the electric current in same-phase coiling
Reversed magnetic field is generated in circle and is cancelled out each other, and normal signal electric current is mainly influenced by coil resistance (and on a small quantity because of leakage at this time
It is damped caused by sense)；When there is common mode current flowing through coil, due to the same tropism of common mode current, can be generated in coil in the same direction
Magnetic field and increase the induction reactance of coil, so that coil is shown as high impedance, generate stronger damping, with this attenuation common-mode electricity
Stream, achievees the purpose that filtering.
A kind of small-sized common mode inductance of domestic production, using the noise Retraining Measures of high frequency, common mode choke coil structure, news
It is number unattenuated, it is small in size, easy to use, have many advantages, such as that the degree of balance is good, easy to use, high-quality.It is widely used in double flat weighing apparatus
Tuning device, multifrequency transformer, impedance transformer, balance and uneven conversion transformer ... etc..
There are also a kind of common-mode filter inductance/electromagnetic interface filter inductance to use ferrite core, Double-wire parallel wound, and noise inhibits
Countermeasure is good, and high common mode noise inhibits and low differential mode noise signal inhibits, and low differential mode noise signal inhibits interference source, in high speed signal
In be difficult to deform, it is small in size, have many advantages, such as that the degree of balance is good, easy to use, high-quality.It is widely used in inhibition electronic equipment
The USB line road of EMI noise, PC and peripheral equipment, the IEEE1394 route of DVC, STB, liquid crystal display panel, low pressure are micro-
Sub-signal ... etc..
Disadvantage of the prior art is that: under normal conditions, while the frequency range filtered needed for attentional selection, common code impedance are bigger
It is better, therefore need to see device data when selecting common mode inductance, mainly according to impedance frequency Curve selection.It is infused when in addition selecting
Meaning considers influence of the differential-mode impedance to signal, is primarily upon differential-mode impedance, pays special attention to high-speed port, in order to inhibit common-mode signal
It is changed into difference mode signal, the numerical value of strict control parasitic capacitance C.Simultaneously L also will as far as possible small, however because of Module specifications and electricity
Road wiring limitation, the smallest L can not be less than 50nH, so that its anti-interference intensity can not be up to standard.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of bandwidth carrier common mode interference suppressing method and
Device, the interference between zero curve and firewire are called DM EMI, and the interference between firewire and ground wire is called common mode interference, and differential mode is dry
It disturbs and is transmitted between two conducting wires, belong to symmetry interference, it is defined as the undesirable electricity between any two current-carrying conductor
Potential difference.Under normal circumstances, common mode interference amplitude is big, frequency is high, can also by conducting wire generate radiation, caused interference compared with
Greatly.The interference that DM EMI amplitude is small, frequency is low, caused is smaller.Differential mode capacitor is introduced in circuit, then differential mode capacitor provides
Shortest path is bypassed DM EMI signal, to inhibit the generation of DM EMI, therefore the inhibition of DM EMI signal
Inhibition relative to common mode interference signal is easier to realize, and smaller, sheet is interfered as caused by difference mode signal on the whole
Common mode interference between firewire and ground wire is converted into two parts by the characteristic of patent difference mode signal, i.e., to firewire construction firewire with
Difference mode signal between firewire, to constructing difference mode signal between ground wire and ground wire, thus can be greatly reduced on the whole firewire with
The interference strength of common-mode signal between ground wire, reduces the influence of common mode interference.
The purpose of the present invention is achieved through the following technical solutions:
A kind of bandwidth carrier common mode interference suppressing method, this method comprises:
With polytetrafluoroethylene (PTFE) conducting wire component carrier signal receiving circuit and carrier signal transmitting line, the carrier signal is connect
It receives and uses firewire ground wire parallel organization in circuit and carrier signal transmitting line；
Firewire in circuit is received to carrier signal and ground wire is wound by mirror image respectively, it is identical that firewire forms even number set the number of turns
Around to opposite coil arranged side by side, ground wire forms identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
To in carrier signal transmitting line firewire and ground wire wind respectively by mirror image, it is identical that firewire forms even number set the number of turns
Around to opposite coil arranged side by side, ground wire forms identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
Carrier signal receives in circuit and carrier signal transmitting line and introduces differential mode capacitor between each adjacent windings；
Carrier signal receive circuit from utility grid receive carrier signal, via after OFDM modulation /demodulation by carrier signal
Transmitting line is uploaded to power grid.
Further, the carrier signal receive circuit and to carrier signal transmitting line each by mutual inductor from electricity
Net obtains signal or up-delivering signal.
A kind of bandwidth carrier common mode interference inhibition device, the device include that carrier signal receives circuit, carrier signal is sent
Circuit and OFDM module；
The firewire that the carrier signal receives circuit is successively wrapped on even number wrapping post, the winding of adjacent two wrapping post
Contrary, i.e., the coil winding direction on each wrapping post is with the first winding direction → second winding direction → first winding direction
→ the second winding direction or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction
It carries out；
The ground wire that the carrier signal receives circuit is successively wrapped on even number wrapping post, the winding of adjacent two wrapping post
It is contrary, and earth wire winding around first wrapping post winding direction and firewire first wrapping post winding direction on the contrary, i.e.
Firewire is the first winding direction → second winding direction → first winding direction → second winding direction, then ground wire is the second winding
Direction → the first winding direction → the second winding direction → the first winding direction；
Carrier signal receives circuit firewire and the front end of ground wire connects mutual inductor from power grid acquisition carrier signal, carrier wave letter
The end for number receiving circuit firewire and ground wire is connected to OFDM module input；
The firewire of the carrier signal transmitting line is successively wrapped on even number wrapping post, the winding of adjacent two wrapping post
Contrary, i.e., the coil winding direction on each wrapping post is with the first winding direction → second winding direction → first winding direction
→ the second winding direction or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction
It carries out；
The ground wire of the carrier signal transmitting line is successively wrapped on even number wrapping post, the winding of adjacent two wrapping post
It is contrary, and earth wire winding around first wrapping post winding direction and firewire first wrapping post winding direction on the contrary, i.e.
Firewire is the first winding direction → second winding direction → first winding direction → second winding direction, then ground wire is the second winding
Direction → the first winding direction → the second winding direction → the first winding direction；
OFDM module output end connects the front end by carrier signal transmitting line firewire and ground wire, carrier signal transmitting line
Mutual inductor is connected between firewire and the end of ground wire, signal is uploaded to by power grid by mutual inductor；
Wherein, first winding direction and second winding direction are opposite.
Further, the carrier signal receives the diameter whole phase of each wrapping post in circuit and carrier signal transmitting line
Together, each wrapping post coil the number of turns is identical, each wrapping post coil Clearance Between Wound homogeneous phase etc., the coil of adjacent two wrapping post it
Between introduce differential mode capacitor C ', the purpose for introducing differential mode capacitor C ' is dry in order to eliminate the differential mode between the coil of adjacent two wrapping post
It disturbs, avoids the bring DM EMI when reducing common mode interference influences.
Further, the carrier signal receive firewire and earth wire winding in circuit and carrier signal transmitting line around coiling
Column is uniformly distributed in the same horizontal line in two column parallel lines, i.e., the wrapping post and earth wire winding of firewire winding around wrapping post point column
In the left and right sides, the wrapping post of firewire column is erect on the same line and the gap of adjacent two wrapping post is equal, ground alignment around
Terminal is erect on the same line and the gap of adjacent two wrapping post is equal, and the wrapping post of firewire column and ground alignment is in symmetrical junction
The coil winding direction of structure, firewire column and ground alignment is mirror-image structure.
Further, firewire column and the wrapping post quantity of alignment it is identical, at least 4, due to this programme be
The difference mode signal that firewire and ground wire are respectively set up can not completely eliminate difference mode signal although introducing differential mode capacitor C '
Caused by interfere, therefore wrapping post quantity is arranged to a plurality of, i.e. wrapping post quantity is more, the voltage that each wrapping post is got
Source amplitude is smaller, then caused by difference mode signal interference it is smaller, therefore the quantity of wrapping post should be under the principle of balancing material cost
Setting as much as possible.
Further, the carrier signal receive firewire and earth wire winding in circuit and carrier signal transmitting line around coiling
Column is distributed in a ring, and bilateral symmetry, the i.e. wrapping post of firewire are uniformly distributed in a ring, and the wrapping post of ground wire uniformly divides in a ring
The coil winding direction of cloth, bilateral symmetry between two groups of wrapping posts, firewire and ground wire is mirror-image structure.
Further, the conducting wire between adjacent two wrapping posts is arc-shaped, which introduces differential mode capacitor.
Further, it is followed between the wrapping post of same group of annular spread since coil winding direction sequentially forms length on the contrary
The arc section lead of ring variation, long arc shape section lead introduce differential mode capacitor C1, and short arc section lead introduces differential mode capacitor C2, close
System meets:
Wherein S is long arc shape section lead length, and S ' is short arc section lead length, due between the wrapping post of annular spread
Gap between inner ring and outer ring is different, to guarantee that the difference mode signal formed between two wrapping posts cancels each other out, therefore according to not
Different differential mode capacitors are set with camber line segment length, to offset influence caused by its conductor length.
Further, the central angle of the wrapping post annular spread is 180 °, in the structure of wrapping post annular spread, when
The central angle of annular spread be 180 ° when, the distance of the head and end of conducting wire is farthest, it is possible to reduce in addition completely isolation end it
Between interfere with each other.
The beneficial effects of the present invention are: conventional common-mode suppressor mode is the form using Double-wire parallel wound or associate coil, disappear
Except the interference signal intensity between firewire and ground wire, in order to inhibit common-mode signal to be changed into difference mode signal, strict control parasitic
The numerical value of capacitor C.Simultaneously inductance also will as far as possible small, however because Module specifications and circuit connection limit, the smallest inductance L can not
Less than 50nH, the present invention eliminates the intensity of common mode interference signal between firewire and ground wire from common mode interference signal itself, point
It is other that difference mode signal is constructed to firewire and ground wire, so that there are difference mode signals for firewire itself, since difference mode signal is that amplitude is identical
Inversion signal, to reduce the entire signal strength of firewire, similarly, also constructs ground wire so that offsetting each other
Difference mode signal, so that the common-mode signal strength reduction between firewire and ground wire, then again to firewire and design of Grounding Connections Cheng Jing
As the coil of structure, equivalent circuit is identical as Double-wire parallel wound coil, but advantage is to have reduced the intensity of common-mode signal,
To reduce influence caused by common mode interference on the whole.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment 1；
Fig. 2 is signal transmitting and receiving module coil structural schematic diagram in embodiment 1；
Fig. 3 is the structural schematic diagram of embodiment 2；
Fig. 4 is signal transmitting and receiving module coil structural schematic diagram in embodiment 2；
Fig. 5 is prior art Double-wire parallel wound coil schematic diagram；
Fig. 6 is the equivalent circuit diagram of Double-wire parallel wound coil；
Fig. 7 is the equivalent circuit diagram of Double-wire parallel wound coil practical application；
Fig. 8 is the equivalent circuit diagram for the difference mode signal that Double-wire parallel wound coil considers that common-mode signal conversion generates；
Fig. 9 is the simulation result schematic diagram of circuit model of the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It sends below.
A kind of bandwidth carrier common mode interference suppressing method, this method comprises:
With polytetrafluoroethylene (PTFE) conducting wire component carrier signal receiving circuit and carrier signal transmitting line, the carrier signal is connect
It receives and uses firewire ground wire parallel organization in circuit and carrier signal transmitting line；
Firewire in circuit is received to carrier signal and ground wire is wound by mirror image respectively, it is identical that firewire forms even number set the number of turns
Around to opposite coil arranged side by side, ground wire forms identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
To in carrier signal transmitting line firewire and ground wire wind respectively by mirror image, it is identical that firewire forms even number set the number of turns
Around to opposite coil arranged side by side, ground wire forms identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
Carrier signal receives in circuit and carrier signal transmitting line and introduces differential mode capacitor between each adjacent windings；
Carrier signal receive circuit from utility grid receive carrier signal, via after OFDM modulation /demodulation by carrier signal
Transmitting line is uploaded to power grid.
Method of the invention is described in further details with two specific embodiments below.
Embodiment 1
A kind of bandwidth carrier common mode interference inhibition device, the device include that carrier signal receives circuit, carrier signal is sent
Circuit and OFDM module；
The firewire that carrier signal receives circuit is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, the coil winding direction on i.e. each wrapping post is with the first winding direction → second winding direction → first winding direction → the
Two winding directions or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction carry out；
The ground wire that carrier signal receives circuit is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, and earth wire winding around first wrapping post winding direction and firewire first wrapping post winding direction on the contrary, i.e. firewire
For the first winding direction → second winding direction → first winding direction → second winding direction, then ground wire is the second winding direction
→ the first winding direction → the second winding direction → the first winding direction；
Carrier signal receives circuit firewire and the front end of ground wire connects mutual inductor from power grid acquisition carrier signal, carrier wave letter
The end for number receiving circuit firewire and ground wire is connected to OFDM module input；
The firewire of carrier signal transmitting line is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, the coil winding direction on i.e. each wrapping post is with the first winding direction → second winding direction → first winding direction → the
Two winding directions or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction carry out；
As shown in Figure 1 and Figure 2, wherein the distribution of wrapping post is not to tile in practical figure, only for convenience of displaying wrapping post in figure
Structure, in a practical situation, firewire and ground wire wrapping post are erect in two column, and the ground wire of carrier signal transmitting line is successively wound
On even number wrapping post, the winding direction of adjacent two wrapping post on the contrary, and earth wire winding around first wrapping post winding direction
First wrapping post winding direction with firewire is on the contrary, i.e. firewire is the first winding direction → second winding direction → first winding
Direction → the second winding direction, then ground wire is the second winding direction → first winding direction → second winding direction → first winding
Direction；
OFDM module output end connects the front end of carrier signal transmitting line firewire and ground wire, carrier signal transmitting line fire
Mutual inductor is connected between line and the end of ground wire, signal is uploaded to by power grid by mutual inductor.Wherein, the first winding direction
With second winding direction on the contrary, such as the first winding direction is that then the second winding direction is counterclockwise clockwise.
Further, carrier signal receive each wrapping post in circuit and carrier signal transmitting line diameter it is all identical,
Each wrapping post coil the number of turns is identical, each wrapping post coil Clearance Between Wound homogeneous phase etc., between the coil of adjacent two wrapping post
Introduce differential mode capacitor C '.
Further, carrier signal receive firewire and earth wire winding in circuit and carrier signal transmitting line around wrapping post be in
Two column parallel lines are uniformly distributed in the same horizontal line, i.e., firewire winding wrapping post and earth wire winding around wrapping post be respectively in a left side
The wrapping post of right two sides, firewire column is erect on the same line and the gap of adjacent two wrapping post is equal, the wrapping post of ground alignment
It erects on the same line and the gap of adjacent two wrapping post is equal, the wrapping post of firewire column and ground alignment is in symmetrical structure, fire
The coil winding direction of alignment and ground alignment is mirror-image structure.
Further, firewire column are identical with the ground wrapping post quantity of alignment, and at least 4.
Embodiment 2
Compared with Example 1, difference in this case is that the arrangement and distribution of wrapping post are different.As shown in Figure 3, Figure 4,
Wherein the distribution of wrapping post is not to tile in practical figure, only for convenience of the structure for showing wrapping post in figure, in a practical situation, fire
Line and ground wire wrapping post are erect in two column, carrier signal receive firewire and earth wire winding in circuit and carrier signal transmitting line around
Wrapping post is distributed in a ring, and bilateral symmetry, the i.e. wrapping post of firewire are uniformly distributed in a ring, and the wrapping post of ground wire is equal in a ring
The coil winding direction of even distribution, bilateral symmetry between two groups of wrapping posts, firewire and ground wire is mirror-image structure.
Further, the conducting wire between adjacent two wrapping post is arc-shaped, arc section lead introducing differential mode capacitor, and same group
Since coil winding direction sequentially forms the arc section lead of length circulation change, coiling on the contrary between the wrapping post of annular spread
The central angle of column annular spread is 180 °, can make head end that signal occur with end when selecting 180 ° and interfere with each other, so that first
Apart from longest, long arc shape section lead introduces differential mode capacitor C1 at last both ends, and short arc section lead introduces differential mode capacitor C2, and relationship is full
Foot:
Wherein S is long arc shape section lead length, and S ' is short arc section lead length.
Working principle explanation:
Explanation, the structure of Double-wire parallel wound coil such as Fig. 5 are compared with the present invention by taking Double-wire parallel wound in the prior art as an example
Shown, Fig. 6 is equivalent circuit diagram, and C indicates the parasitic capacitance between primary coil in Fig. 7, and L indicates leakage inductance, as long as self-induction capacity foot
Receiving and transmitting signal can not be enough influenced, estimates and does not identify.The C of existing various coils is in 10pF or more, and L is about in 0.1-0.2uH or so.
Upper figure is the equivalent circuit of theoretical single module, in actual application environment, between two coils there are also biggish capacitance to earth and
Induction reactance, induction reactance play the role of decision to the incoming of common-mode signal, and actual application equivalent circuit illustrates as follows.
Wherein C2, C3 are coupled capacitor, typically larger than 10nF, L2, and L3 is common mode reactance over the ground, and minimum is about 50nH, letter
Number transmitting terminal is the driving of difference power amplifier, and coil ratio takes 1:1, for differential mode signal transmission, signal received by theoretical Zi
The case where amplitude depends on the ratio of RX and RY, is not influenced by impedance ground, but this is the influence of the common-mode signal considered.
In 8 in figure, the parasitic capacitance of C1, C2 between transmitting terminal primary coil, C3, C4 are the first pole of receiving end coupling coil
Between parasitic capacitance.The capacitive reactance of signal coupled capacitor be the one thousandth of parasitic capacitance hereinafter, therefore while estimating need not consider.It is defeated
The difference mode signal that outlet is generated by common-mode signal conversion are as follows:
In formula, VcmIndicate that work mould signal source voltage, Z indicate the impedance of each element, subscript indicates between counter element
Relationship；
Assuming that end signal strength 120dBuV is sent, with C1, C2, C3=10pF；L2=50nH estimation, then correspond to carrier frequency
1MHz and 15MHz, common mode attenuation amount are 138dB and 66dB, the theoretical value of difference mode signal theory that receiving end obtains for-
50dBuV (theory conversion does not have practical significance) and 22dBuV, the sensitivity of wideband high-frequency end have been unable to measure.Actually because of mould
The limitation of block installation, the limitation of site environment, L2 can reach nH rank, and site environment is worse.In order to inhibit common mode to believe
Number it is changed into difference mode signal, the numerical value of strict control parasitic capacitance C.Z simultaneouslyL2Also will as far as possible small, however it is detailed earlier herein, because
Module specifications and circuit connection limitation, the smallest L can not be less than 50nH.
In the present invention:
Assuming that the voltage magnitude between firewire and ground wire is U, the distance between firewire and ground wire are d, then firewire and ground wire
Between existing electric interfering field intensity it is unidirectional are as follows:
Common mode interference signal intensity between firewire and ground wire are as follows:
In formula, f is frequency, and I is common mode current, and l is conductor length, by can be seen that common mode interference and frequency in formula, being total to
Mould electric current, common mode conductor length are directly proportional, therefore the mode for reducing common mode interference can use:
Reduction source voltage, the i.e. voltage magnitude of firewire and ground wire；Reduce the length of common mode conducting wire；
Firewire and ground wire are respectively wound around on wrapping post by the present invention thus, it is assumed that wrapping post be it is N number of, each wrapping post it
Between spacing be S, conducting wire overall length is l, and the diameter of wrapping post is R, and the number of turns of each wrapping post is M, and the resistivity of conducting wire is ρ,
Then have:
L=(N-1) S+MN π R ... (5)
U=(N-1) S ρ I+MN π R ρ I ... (6)
The physical length l' of conducting wire are as follows:
L'=(N-1) S+MNR ... (7)
Due to constructing difference mode signal respectively in firewire and ground wire, so that the voltage between each wrapping post coil mutually supports
Disappear, virtual voltage U' are as follows:
U'=(N-1) S ρ I ... (8)
L' can be made much smaller than l using the present invention it can be seen from formula (5)-(8), while U' is much smaller than U, thus
Fundamentally reduce the intensity of common mode interference signal, then again between firewire and ground wire constitute mirror image coil (i.e. equal turn numbers,
Winding direction is opposite), it is similar to Double-wire parallel wound coil in the prior art, to reduce to above-mentioned ZL2Requirement so that altogether
Mould interference signal is effectively suppressed, and the DM EMI signal that firewire and ground wire respectively construct then pass through introduce differential mode capacitor into
Row is eliminated, and reducing influences caused by difference mode signal.
As shown in figure 9, carrying out the emulation testing of emulation testing and traditional Double-wire parallel wound coil using circuit of the invention
It compares, common mode inhibition capacity obtains the raising of 40DB after the present invention improves.
The above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to shape described herein
Formula should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be herein
In the contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art are carried out
Modifications and changes do not depart from the spirit and scope of the present invention, then all should be within the scope of protection of the appended claims of the present invention.
Claims (10)
1. a kind of bandwidth carrier common mode interference suppressing method, which is characterized in that this method comprises:
With polytetrafluoroethylene (PTFE) conducting wire component carrier signal receiving circuit and carrier signal transmitting line, the carrier signal receives electricity
Firewire ground wire parallel organization is used in road and carrier signal transmitting line；
Firewire in circuit is received to carrier signal and ground wire is wound by mirror image respectively, firewire formed even number set the number of turns it is identical around to
Opposite coil arranged side by side, ground wire form identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
To in carrier signal transmitting line firewire and ground wire wind respectively by mirror image, firewire formed even number set the number of turns it is identical around to
Opposite coil arranged side by side, ground wire form identical as even number set the number of turns of firewire mirror image around to opposite coil arranged side by side；
Carrier signal receives in circuit and carrier signal transmitting line and introduces differential mode capacitor between each adjacent windings；
Carrier signal receives circuit and receives carrier signal from utility grid, is sent via after OFDM modulation /demodulation by carrier signal
Circuit is uploaded to power grid.
2. a kind of bandwidth carrier common mode interference suppressing method according to claim 1, which is characterized in that the carrier signal
It receives circuit and carrier signal transmitting line and obtains signal or up-delivering signal from power grid each by mutual inductor.
3. a kind of bandwidth carrier common mode interference for realizing any one of claim 1-2 the method inhibits device, feature exists
In the device includes that carrier signal receives circuit, carrier signal transmitting line and OFDM module；
The firewire that the carrier signal receives circuit is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, the coil winding direction on i.e. each wrapping post is with the first winding direction → second winding direction → first winding direction → the
Two winding directions or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction carry out；
The ground wire that the carrier signal receives circuit is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, and earth wire winding around first wrapping post winding direction and firewire first wrapping post winding direction on the contrary, i.e. firewire
For the first winding direction → second winding direction → first winding direction → second winding direction, then ground wire is the second winding direction
→ the first winding direction → the second winding direction → the first winding direction；
It is connected to the mutual inductor that carrier signal receives between circuit firewire and the front end of ground wire and obtains carrier signal from power grid, carry
The end of wave signal receiving circuit firewire and ground wire is connected to OFDM module input；
The firewire of the carrier signal transmitting line is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, the coil winding direction on i.e. each wrapping post is with the first winding direction → second winding direction → first winding direction → the
Two winding directions or the arrangement of the second winding direction → first winding direction → second winding direction → first winding direction carry out；
The ground wire of the carrier signal transmitting line is successively wrapped on even number wrapping post, the winding direction of adjacent two wrapping post
On the contrary, and earth wire winding around first wrapping post winding direction and firewire first wrapping post winding direction on the contrary, i.e. firewire
For the first winding direction → second winding direction → first winding direction → second winding direction, then ground wire is the second winding direction
→ the first winding direction → the second winding direction → the first winding direction；
OFDM module output end connect carrier signal transmitting line firewire and ground wire front end, carrier signal transmitting line firewire with
Mutual inductor is connected between the end of ground wire, signal is uploaded to by power grid by mutual inductor；
Wherein, first winding direction and second winding direction are opposite.
4. a kind of bandwidth carrier common mode interference according to claim 3 inhibits device, which is characterized in that the carrier signal
The diameter for receiving each wrapping post in circuit and carrier signal transmitting line is all identical, and each wrapping post coil the number of turns is identical, respectively
Wrapping post coil Clearance Between Wound homogeneous phase etc. introduces differential mode capacitor C ' between the coil of adjacent two wrapping post.
5. a kind of bandwidth carrier common mode interference according to claim 4 inhibits device, which is characterized in that the carrier signal
Receive firewire and earth wire winding in circuit and carrier signal transmitting line around wrapping post be evenly distributed in two column parallel lines it is same
On horizontal line, i.e., the wrapping post and earth wire winding of firewire winding around wrapping post be respectively in the left and right sides, the wrapping post of firewire column is perpendicular
It is vertical on the same line and the gap of adjacent two wrapping post is equal, the wrapping post of ground alignment is erect on the same line and adjacent two
The gap of wrapping post is equal, and the wrapping post of firewire column and ground alignment is in symmetrical structure, the coil winding side of firewire column and ground alignment
To for mirror-image structure.
6. a kind of bandwidth carrier common mode interference according to claim 5 inhibits device, which is characterized in that the firewire column and
The wrapping post quantity of ground alignment is identical, and at least 4.
7. a kind of bandwidth carrier common mode interference according to claim 4 inhibits device, which is characterized in that the carrier signal
Receive firewire and earth wire winding in circuit and carrier signal transmitting line around wrapping post be distributed in a ring, and bilateral symmetry is that is, fiery
The wrapping post of line is uniformly distributed in a ring, and the wrapping post of ground wire is uniformly distributed in a ring, bilateral symmetry between two groups of wrapping posts, fire
The coil winding direction of line and ground wire is mirror-image structure.
8. a kind of bandwidth carrier common mode interference according to claim 5 inhibits device, which is characterized in that adjacent two wrapping post
Between conducting wire it is arc-shaped, the arc section lead introduce differential mode capacitor.
9. a kind of bandwidth carrier common mode interference according to claim 8 inhibits device, which is characterized in that same group of annular point
Since coil winding direction sequentially forms the arc section lead of length circulation change on the contrary between the wrapping post of cloth, long arc shape section is led
Line introduces differential mode capacitor C1, and short arc section lead introduces differential mode capacitor C2, and relationship meets:
Wherein S is long arc shape section lead length, and S ' is short arc section lead length.
10. a kind of bandwidth carrier common mode interference according to claim 9 inhibits device, which is characterized in that the wrapping post
The central angle of annular spread is 180 °.
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