CN1976244A - Power line communication device with filter - Google Patents
Power line communication device with filter Download PDFInfo
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- CN1976244A CN1976244A CN 200610139675 CN200610139675A CN1976244A CN 1976244 A CN1976244 A CN 1976244A CN 200610139675 CN200610139675 CN 200610139675 CN 200610139675 A CN200610139675 A CN 200610139675A CN 1976244 A CN1976244 A CN 1976244A
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- filter
- power line
- type filter
- frequency band
- line communication
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Abstract
The present invention provides a power line communication device with filter. A filter circuit in a power line communication device is composed of the balanced filter 3 connected to two power lines 2a, 2b in a power line and allowing a prescribed band to pass through, a first imbalanced filter 21 provided between one power line 2a and ground and cutting signals in bands other than the prescribed band, and a second imbalanced filter 22 provided between the other power line 2b and the ground and cutting signals in the bands other than the prescribed band. Thereby it achieves further excellent characteristics near a passband and in a high-pass stopband while suppressing increase of the number of components due to increase of the number of poles of a balanced filter.
Description
Technical field
The present invention relates to power line as the power line communication apparatus that signal transmission channel uses, relate in particular to the power line communication apparatus that possesses the filter that is used to suppress unwanted radiation.
Background technology
In recent years, proposed to connect data communication machine such as personal computer etc. with adapter (PLC modulator-demodulator) on electrical socket (consent), can realize the power line communication (PLC:Power Line Communication) of the data communication of number Mbps～hundreds of Mbps by communication is set.Owing to be covered with electrical wiring in most buildings, cable laying etc. can be set up intercommunication network simply again.
Owing to there is not to consider on power line, originally to flow through the fact of the high-frequency signal of telecommunication, produce the problem of revealing electric wave.Therefore, consider to adopt to possess and do not allow to surpass the desired frequency scope that the is used for power line communication (power line communication apparatus of the filter of the high order harmonic component composition of 4MHz～20MHz) by suppressing unwanted radiation for example.
Fig. 6 is in power line communication, to suppress the balanced type Filter Structures example that unwanted radiation is the purpose exploitation.With the figure expression, for a pair of power line 2a, the 2b that are connected on the source power supply 1, connect balanced type filter 3, connect PLC modulator-demodulator 4 via this balanced type filter 3, connect the structure of data communication equipment 5 before this.
Adopt three utmost points (three pole) structure of combination LC antiresonant circuits 6, LC series resonant circuit 7 and LC antiresonant circuit 8 with the balanced type filter shown in the figure 3, realize desired frequency scope (4MHz～20MHz) become for example by the such characteristic of frequency band.Be connected damping resistance 11,12 at the mains side of balanced type filter 3 and each of modem side, reduce Q and guarantee scope.In addition; the mains side of balanced type filter 3; via the block capacitor 13,14 and protecting diode 19a, the 19b that are separately positioned on power line 2a, 2b, be connected the secondary side of signal stack with transformer 20, the signal stack is connected with source power supply 1 with the primary side of transformer 20.And, between the end and source power supply 1 of signal stack, insert and prevent the capacitor C1 that short circuit is used with transformer 20 primary sides.The modem side of balanced type filter 3, the block capacitor 15,16 via being separately positioned on power line 2a, the 2b is connected with PLC modulator-demodulator 4.
Fig. 7 is the filtering characteristic figure of the balanced type filter 3 that constitutes like that as mentioned above.By adjusting the element constant that constitutes balanced type filter 3, can access with the characteristic shown in the figure.The characteristic that is obtained by the balanced type filter 3 of three-stage structure is that the lower frequency side littler than 4MHz sharply descends, the gently dipping characteristic of passing through of the high frequency waves side bigger than 20MHz.
, use above-mentioned balanced type filter, by near the frequency band and high-frequency domain by frequency band, realize better characteristic, must increase limit (pole) number, but because balanced type filter element number is many, thereby exist number of components to increase, the relevant issues that cost rises.In addition, owing to be input to power line 2a, 2b from the 50Hz of source power supply 1 or near the power supply ripple noise the 60Hz, even wish in such low-frequency band, also can the remain off characteristic, but cause further increasing of number of components.
Patent documentation 1: the spy opens flat 07-245576 communique.
Summary of the invention
The present invention proposes in view of such problem, its purpose is to provide a kind of to be possessed the limit number that can suppress because of the balanced type filter and increases increasing of the number of components that produces, and near by frequency band and high-frequency domain end the power line communication apparatus that frequency band can be realized the filter of better characteristic.
Power line communication apparatus of the present invention is characterised in that, possesses: the balanced type filter, and it is connected in 2 wires of power line, allows the signal of allocated frequency band to pass through; The first unbalanced type filter, it is arranged between an above-mentioned side's the electric wire and ground, does not allow the outer signal of above-mentioned allocated frequency band to pass through; With the second unbalanced type filter, it is arranged between above-mentioned the opposing party's the electric wire and ground, does not allow the outer signal of above-mentioned allocated frequency band to pass through.
Constitute according to this,, merge balanced type filter and unbalanced type filter, compare with the situation of a plurality of balanced type filters of combination thus, can cut down parts number, can realize that cost reduces by to become the mode of the filtering characteristic that passes through frequency band of realizing expectation.In addition, for the balanced type filter, owing in each of 2 wires the unbalanced type filter is set, therefore compare with the situation that only at a wire unbalanced type filter is set, the design with filter circuit is easy, the effect that filtering characteristic is also stable.
And the above-mentioned first and second unbalanced type filters can be by above-mentioned allocated frequency band is constituted as the band pass filter by frequency band.Thus, can improve the filtering characteristic by frequency band and lower frequency region side of high-frequency domain side by frequency band.
And the above-mentioned first and second unbalanced type filters can be made of as the low pass filter by frequency band the high-frequency domain side that above-mentioned allocated frequency band is outer.Thus, can improve the filtering characteristic by frequency band of high-frequency domain side with simpler structure.
According to the present invention, by balanced type filter and unbalanced type filter are merged, can suppress to increase because of the limit number of balanced type filter increases the number of components that produces, and by near the frequency band and high-frequency domain end frequency band, can realize better characteristic.
Description of drawings:
Fig. 1 is the structure chart of the filter segment of the power communication line apparatus that relates to of an embodiment of the present invention.
Fig. 2 is the performance plot of unbalanced type filter shown in Figure 1.
Fig. 3 is the performance plot of the overall filter in the power communication line apparatus shown in Figure 1.
Fig. 4 is the structure chart of the filter segment of the power communication line apparatus that relates to of variation.
The performance plot of the overall filter when Fig. 5 is to use ∏ type unbalanced type filter.
Fig. 6 is the structure chart of power communication line apparatus in the past
Fig. 7 is the performance plot of the overall filter of power communication line apparatus shown in Figure 6.
Among the figure: the 1-source power supply; 2a, the 2b-power line; 3-balanced type filter; The 4-PLC modulator-demodulator; The 5-data communication equipment; The 6-LC antiresonant circuit; The 7-LC series resonant circuit; The 8-LC antiresonant circuit; 21,22,41,42-unbalanced type filter; 23,24,28,31,32,36-inductance; 25,26,27,33,34,35-capacitor.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described in detail.
Fig. 1 is the structure chart of the power line communication apparatus that relates to of the present invention-execution mode, mainly represents the filter circuit part.And, give prosign with the each several part same section of balanced type filter shown in Figure 4.Promptly; the mains side of balanced type filter 3; via the block capacitor 13,14 and protecting diode 19a, the 19b that are separately positioned on power line 2a, the 2b, be connected with the secondary side of signal stack with transformer 20, the signal stack is connected with source power supply 1 with the primary side of transformer 20.In addition, be arranged on the modem side of unbalanced type filter 21,22 of the modem side of balanced type filter 3, the block capacitor 15,16 via being separately positioned on power line 2a, the 2b is connected with PLC modulator-demodulator 4.
The power line communication apparatus that present embodiment relates to adopts the combination balanced type filter 3 shown in Figure 6 and the filter construction of unbalanced type filter.Because the circuit structure of balanced type filter 3 has been described, therefore omit explanation here, mainly the formation to unbalanced type filter 21,22 describes.
The power line communication apparatus of present embodiment has adopted, with respect to the PLC modulator-demodulator side end of balanced type filter 3, and the structure that unbalanced type filter 21,22 is connected with the both sides of power line 2a, 2b.That is, binding equilibrium mode filter 3 and unbalanced type filter 21,22 are realized desired characteristics.
Unbalanced type filter 21 is made of so-called ∏ type band pass filter.Particularly, the two ends of inductance 43 are via capacitor 44,45 ground connection, and an end of the PLC modem side of this inductance 43 via capacitor 46, is connected with an end of block capacitor 15.Ground connection is distinguished via inductance 48,49 in the two ends of capacitor 46.
The unbalanced type filter 22 that is connected another root power line 2b side also constitutes equally with above-mentioned unbalanced type filter 21.That is, the two ends of inductance 51 are via capacitor 52,53 ground connection, and an end of the PLC modem side of this inductance 51 via capacitor 54, is connected with an end of block capacitor 16.The two ends of capacitor 54 are via inductance 55,56 ground connection.
Fig. 2 is the schematic diagram that passes through frequency bandwidth characteristics of unbalanced type filter 21,22.Shown in figure, expectation pass through the little lower frequency side of 4MHz in the frequency band as the lower limit of lower frequency region side and with become by frequency band as the high high frequency side of the 20MHz of the upper limit of high-frequency domain side.
Have like this unbalanced type filter 21,22 by frequency bandwidth characteristics and have the balanced type filter 3 of filtering characteristic shown in Figure 7 by combination, adjust each constant, can realize filtering characteristic shown in Figure 3 thus.Show and only compare by the filtering characteristic of balanced type filter 3 shown in Figure 6, more precipitous near the high frequency waves side of 20MHz, thus can realize better characteristic at high-frequency domain by frequency band.In addition, the desired frequency band at 4MHz～20MHz can realize more smooth filtering characteristic.The lower frequency side littler than 4MHz is precipitous decline, can stop the power supply ripple noise that is present in lower frequency region (ripple noise) that is caused by source power supply 1 reliably.
Like this, owing to pass through present embodiment, power line 2a, 2b to both sides connect unbalanced type filter 21,22, combination balancing mode filter 3 and unbalanced type filter 21,22, realized the frequency bandwidth characteristics that passes through of expectation, so compare with the situation that makes up several balanced type filters formation filters in order to obtain equal characteristic, can reduce parts number significantly, can realize the reduction of cost.In addition, owing to,, unbalanced type filter 21,22 is set separately on the 2b at two power line 2a for balanced type filter 3, compare with the situation that the unbalanced type filter only is set on a side power line, have the easy and also stable effect of filtering characteristic of design of filter circuit.
And, because as unbalanced type filter 21,22, use meets the BPF that passes through frequency bandwidth characteristics of expectation, high-frequency domain when frequency band can realize better characteristic, can stop the power supply ripple noise of the lower frequency region that produces by source power supply 1 to pass through effectively.
In the above description, adopted ∏ type BPF as unbalanced type filter 21,22, the present invention is not limited to ∏ type BPF.Except the ∏ type, also can use general T type BPF.
Fig. 4 is as the unbalanced type filter, adopts the structure chart of the variation of T type BPF.Represented the filter segment identical with Fig. 1.A power line 2a is connected unbalanced type filter 41, and another root power line 2b connects unbalanced type filter 42.
Be connected the unbalanced type filter 42 of the opposing party's power line 2b side, equally with above-mentioned unbalanced type filter 41 constitute by T type band pass filter.That is, 2 inductors 31,32 that are connected in series, its intermediate point connects ground connection by capacitor 33.In addition, 2 capacitors 34,35 that are connected in series, its intermediate point is via inductor 36 ground connection.One end of one side's inductor 32 is connected with an end of a side capacitor 34, constitutes the series circuit that is made of inductor 31,32 and capacitor 34,35.One end of inductor 31 is connected the power line 2b side of LC resonant circuit 8 via resistive element 18.In addition, an end of the PLC modem side of another capacitor 35 is connected with an end of block capacitor 16.
Make up the unbalanced type filter 41,42 that constitutes by T type BPF and balance mode filter 3 as mentioned above like that and constitute the situation of filter, realize that with the several balanced type filters of combination the situation of desired characteristics compares, also can cut down number of elements.In addition, by few component count, near by frequency band and high-frequency domain also can realize good characteristic by frequency band.
In addition, as unbalanced type filter (21,22 or 41,42),, also can pass through to realize good characteristic with the frequency band that ends of high-frequency domain near the frequency band even use ∏ type LPF or T type LPF.Characteristic Simulation result when Fig. 5 is to use ∏ type LPF as the unbalanced type filter.In addition, the BPF or the LPF that can be used as the unbalanced type filter are not limited to aforesaid way, can make filter in various manners.
The present invention can be applied to, and possesses the power line communication apparatus that is used to suppress in power line communication from the filter of the unwanted radiation of power line.
Claims (3)
1, a kind of power line communication apparatus possesses:
The balanced type filter, it is connected in 2 wires of power line, allows the signal of allocated frequency band to pass through;
The first unbalanced type filter, it is arranged between a described side's the electric wire and ground, does not allow the outer signal of described allocated frequency band to pass through; With
The second unbalanced type filter, it is arranged between described the opposing party's the electric wire and ground, does not allow the outer signal of described allocated frequency band to pass through.
2, power line communication apparatus according to claim 1 is characterized in that,
The described first and second unbalanced type filters are to be the band pass filter by frequency band with described allocated frequency band.
3, power line communication apparatus according to claim 1 is characterized in that,
The described first and second unbalanced type filters are to be the low pass filter by frequency band with the outer high-frequency domain side of described allocated frequency band.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005290214 | 2005-10-03 | ||
| JP2005290214A JP2007104205A (en) | 2005-10-03 | 2005-10-03 | Power line communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1976244A true CN1976244A (en) | 2007-06-06 |
Family
ID=38030716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610139675 Pending CN1976244A (en) | 2005-10-03 | 2006-09-28 | Power line communication device with filter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007104205A (en) |
| CN (1) | CN1976244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136853A (en) * | 2011-02-11 | 2011-07-27 | 杭州百富电力技术有限公司 | Receiver, clear channel assessment (CCA) detection device and CCA detection method for power line communication (PLC) system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9276638B2 (en) * | 2010-09-22 | 2016-03-01 | Texas Instruments Incorporated | Coupling circuits for power line communication devices |
| JP5790317B2 (en) * | 2011-08-29 | 2015-10-07 | 株式会社村田製作所 | Chip-type balance filter and power line communication device including the same |
-
2005
- 2005-10-03 JP JP2005290214A patent/JP2007104205A/en not_active Withdrawn
-
2006
- 2006-09-28 CN CN 200610139675 patent/CN1976244A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136853A (en) * | 2011-02-11 | 2011-07-27 | 杭州百富电力技术有限公司 | Receiver, clear channel assessment (CCA) detection device and CCA detection method for power line communication (PLC) system |
| CN102136853B (en) * | 2011-02-11 | 2013-08-28 | 兆讯恒达微电子技术(北京)有限公司 | Receiver, clear channel assessment (CCA) detection device and CCA detection method for power line communication (PLC) system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007104205A (en) | 2007-04-19 |
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Open date: 20070606 |