CN1756111A - Modem for power line communication and signal superposition method - Google Patents
Modem for power line communication and signal superposition method Download PDFInfo
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- CN1756111A CN1756111A CN 200510106866 CN200510106866A CN1756111A CN 1756111 A CN1756111 A CN 1756111A CN 200510106866 CN200510106866 CN 200510106866 CN 200510106866 A CN200510106866 A CN 200510106866A CN 1756111 A CN1756111 A CN 1756111A
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Abstract
To obtain a method for superimposing a signal in a power line communication (PLC) modem and the PLC modem which realize cost reduction by simplifying a circuit constitution of the PLC modem including a power supply circuit. The PLC modem is provided with: a power supply transformer T1 of which the primary winding wire is connected to a power line; and a rectification circuit including DC power supply terminals P1-P3 at a secondary winding wire of the power supply transformer and for feeding DC power supply to constitutive equipment of the PLC modem. The PLC signal circuit and the DC power supply terminal P1 are connected so that a communication signal Tx for transmission from a PLC signal circuit of the PLC modem is supplied to the DC power supply terminal P1, the communication signal is superimposed on the power line, and the communication signal from the power line is delivered to the PLC signal circuit as a reception signal Rx via the DC power supply terminal P1. An unbalanced band-pass filter BPF 2 is provided between the PLC signal circuit and the DC power supply terminal P1.
Description
Technical field
The present invention relates to signal superposition method and the modem dedicated for electric line communication of power line communication (PLC:Power Line Communication) with modulator-demodulator, be particularly related to, the signal overlap that can will be used for power line communication by simple structure is at power line and will be from the signal superposition method and the modem dedicated for electric line communication of the modem dedicated for electric line communication of the Signal Separation of power line.
Background technology
In recent years, a kind of system is by motion, it can wait family's inner machines such as making various household appliances to have the power line communication function within the family, monitor and control these family's inner machines by the machine tool that constitutes by PC etc., from the outside by public telecommunication network described machine tool is conducted interviews, from exterior monitoring and control family's inner machine.In addition, another kind of system is also by motion, it can handle the more signal of high speed by power line communication, multimedia messages such as the video information that will be provided by the public telecommunication network that comprises the Internet by ISP (Internet Service Provider), audio-frequency information shows on display unit such as PC in real time.
For the transmission of carrying out various signals by foregoing power line communication receives, owing to being necessary that attaching plug is received as the transmission that media carries out data, therefore, to overlap onto power line via its own power source path from the signal of modem dedicated for electric line communication, and will be from the Signal Separation of power line and the circuit of incoming modem necessitates.
Fig. 4 is the structured flowchart of power circuit of the modem dedicated for electric line communication of the expression explanation signal superposition method of signal overlap on power line that will be used for power line communication according to prior art.In Fig. 4, the 35th, diode bridge, the 36th, switching circuit, the 37th, photoelectrical coupler, the 38th, filter circuit, the 39th, AC plug, T1 is a power transformer, T2 is the signal overlap transformer, and C1～C8 is a capacitor, and D1～D3 is the rectification diode, L1 is an inductor, R1, R2 are adjusters, and BPF1 is a band pass filter, and P1～P3 is the direct-current power supply terminal.
Power circuit shown in Figure 4 is to have filter circuit 38, diode bridge 35, switching circuit 36, transformer T1, rectification with diode D1～D3, smoothing capacitor C1～C6, photoelectrical coupler 37 and constitute.Therefore, through the interchange source power supply of AC plug 39, through filter 38, by 35 rectifications of diode bridge, by capacitor C7 level and smooth after, be imported into switching circuit 36, be transformed to the controlled interchange of its voltage by switching circuit 36, and be input to the primary coil of transformer T1.The secondary coil of transformer T1 is provided with a plurality of taps, connects rectification diode D1～D3 and level and smooth electricity consumption container C 1～C6 in this.
By the direct current of rectification, further, export by direct-current power supply terminals P 3 with inductor L1, capacitor C3 via level and smooth with diode D3 output.In addition, this direct voltage feeds back to switching circuit 36 via photoelectrical coupler 37 with its magnitude of voltage, is used to make the dc voltage stability by 3 outputs of direct-current power supply terminals P.In addition, come the direct current output of self-rectifying with diode D1, D2, further via adjuster R1, R2 and level and smooth electricity consumption container C 1, C2, and by direct-current power supply terminals P 1, P2 output.By the direct voltage of direct-current power supply terminals P 1～P3 output, owing to be fed into the various functional circuits that constitute modulator-demodulator, therefore have+12V ,+5V ,+magnitude of voltage of 3.3V.
On the other hand, should overlap the transmission signal Tx on the power line from the PLC circuit of modem dedicated for electric line communication, via symmetric type band pass filter BPF1, signal overlap with transformer T2, decoupling zero electricity consumption container C 8, on the superimposed power line of drawing between by AC plug 39 and filter circuit 38.In addition, send to the signal on the power line, via being sent to the PLC signal circuit of modem dedicated for electric line communication as received signal Rx with above-mentioned opposite path.In this case, with the leading portion of diode bridge 35 filter circuit 38 is set, so that send signal Tx and, can not enter the power circuit side from the signal of power line in rectification.The frequency number of the signal that uses in power line communication in addition, is generally 4MHz～20MHz.Filter circuit 38 is constituted as the signal in this frequency range of blocking, and in addition, band pass filter BPF1 is constituted as and allows the interior signal of this frequency range pass through.
In addition, as the relevant prior art of utilizing power line to carry out the power circuit of data transmitter-receiver device, for example in the patent documentation 1 record technology, by known.
Above-mentioned prior art, when modem dedicated for electric line communication communicates, be necessary to have: be used for the dedicated for electric line communication signal overlap on power line and separate signal overlap transformer from the signal of power line, symmetric type band pass filter, and do not make the dedicated for electric line communication signal enter the multiple functional circuits such as filter of power circuit.Because symmetric type band pass filter costs an arm and a leg, the circuit structure that therefore has the modem dedicated for electric line communication that comprises power circuit will become complicated, cause the problem that cost increases.
Patent documentation 1: the spy opens flat 8-56386 communique.
Summary of the invention
Signal superposition method and the modem dedicated for electric line communication of purpose of the present invention for a kind of modem dedicated for electric line communication is provided, it can solve above-mentioned prior art problems, simplify the circuit structure of the modem dedicated for electric line communication (to call the PLC modulator-demodulator in the following text) that comprises power circuit, and can reduce cost.
According to the present invention, for achieving the above object, modem dedicated for electric line communication in the method for power line overlapped signal, described modem dedicated for electric line communication comprises: power transformer, its primary coil is connected with described power line; And rectification circuit, it has the direct-current power supply terminal, for the formation machine of the described modem dedicated for electric line communication on the secondary coil of this power transformer is supplied with DC power supply; To supply to described direct-current power supply terminal from the signal of the dedicated for electric line communication signal circuit of described modem dedicated for electric line communication, signal of communication is overlapped described power line, to pass through described direct-current power supply terminal from the signal of communication of described power line, be sent to described dedicated for electric line communication signal circuit.
In addition, for achieving the above object, in said method, the transmission of the signal between described dedicated for electric line communication signal circuit and the described direct-current power supply terminal receives, and is undertaken by the asymmetric band pass filter that is arranged between described dedicated for electric line communication signal circuit and the described direct-current power supply terminal.
In addition, according to the present invention, for achieving the above object, in the modem dedicated for electric line communication that communicates to the power line overlapped signal, comprising: power transformer, its primary coil are connected with described power line; And rectification circuit, it has the direct-current power supply terminal, for the formation machine of the described modem dedicated for electric line communication on the secondary coil of this power transformer is supplied with DC power supply; The dedicated for electric line communication signal circuit of described modem dedicated for electric line communication is connected with described direct-current power supply terminal, so that will supply to described direct-current power supply terminal from the signal of communication of the dedicated for electric line communication signal circuit of described modem dedicated for electric line communication, described signal of communication is overlapped described power line, to pass through described direct-current power supply terminal from the signal of communication of described power line, be sent to described dedicated for electric line communication signal circuit.
In addition, for achieving the above object, in said apparatus, between described dedicated for electric line communication signal circuit and described direct-current power supply terminal, has asymmetric band pass filter.
According to the present invention, can reduce the circuit structure of PLC modulator-demodulator, and can realize cost degradation.
Description of drawings
Fig. 1 represents the block diagram of the structure example of suitable electric line communication system of the present invention.
Fig. 2 represents the structured flowchart of PLC modulator-demodulator according to an embodiment of the present invention.
Fig. 3 represents the structured flowchart of the power circuit 31 of PLC modulator-demodulator shown in Figure 2.
Fig. 4 represents to illustrate the structured flowchart of power circuit of modem dedicated for electric line communication that will be used for the signal superposition method of signal overlap on power line of power line communication according to prior art.
Among the figure: 11～15-PLC modulator-demodulator, 16-base station, 17-switching network hub (Switch Hub), the 18-medium converter, 19-network, 20-power line, the 21-USB circuit, 22-Ethernet (registered trade mark) circuit, 23-CPU, 24,27-SRAM, 25-EEPROM, 26-Flash ROM, 28-AISC, 29-PLC application-specific integrated circuit, 30-front end, 31-power circuit unit, 32-display unit, 35-diode bridge, the 36-switching circuit, the 37-photoelectrical coupler, 38-filter circuit, 39-AC plug, the T1-power transformer, T2-signal overlap transformer, C1～C8-capacitor, D1～D3-rectification diode, L1, the L2-inductor, R1, the R2-adjuster, BPF1, the BPF2-band pass filter circuit, P1～P3-direct-current power supply terminal.
Embodiment
Below describe in detail by accompanying drawing, according to the signal superposition method of PLC modulator-demodulator of the present invention and the execution mode of PLC modulator-demodulator.
Fig. 1 represents the block diagram of the structure example of suitable electric line communication system of the present invention, and Fig. 2 represents the structured flowchart of PLC modulator-demodulator according to an embodiment of the present invention.In Fig. 1, Fig. 2,11～15th, PLC modulator-demodulator, the 16th, base station, the 17th, switching network hub (Switch Hub), the 18th, medium converter, the 19th, network, the 20th, power line, the 21st, USB circuit, the 22nd, Ethernet (registered trade mark) circuit, the 23rd, CPU, the 24, the 27th, SRAM, the 25th, EEPROM, the 26th, flicker ROM, the 28th, AISC, the 29th, PLC application-specific integrated circuit, the 30th, front end (front end), the 31st, power circuit unit, the 32nd, display unit.
Electric line communication system shown in Figure 1 as shown in Figure 1, is connected on the power line 20 by a plurality of PLC modulator-demodulators 11～15 and constitutes.On a PLC modulator-demodulator 11, connect base station 16, switching network hub 17 and medium converter 18.PLC modulator-demodulator 12～15 is connected with not shown PC, tame electric machine etc. respectively.PC, tame electric machine etc. can intercom with power line 20 mutually by the PLC modulator-demodulator.In addition, during for connection PC on the PLC modulator-demodulator, this PC can pass through, directly be connected PLC modulator-demodulator, power line 20, PLC modulator-demodulator 11, base station 16, switching network hub 17, medium converter 18 and external network 19 on this PC, and and communicate between the not shown servers such as provider, providing of various information is provided, carries out the transmission reception of mail etc.
Aforesaid electric line communication system also can wait within the family and purchase, in addition, also can be at concentrated dwelling houses such as apartments all purchase a system.And then, also can all departments of enterprise be provided with.
Each PLC modulator-demodulator 11～15 as shown in Figure 2, is made of following structure: as USB circuit 21, Ethernet (registered trade mark) circuit 22 of the interface between PC, the tame electric machine; The CPU 23 that all modulator-demodulators are controlled; Storage is used for SRAM 24, EEPROM 25, the flicker ROM 26 of the program, data in the various processing of CPU 23 etc.; AISC 28; The employed SRAM 27 of AISC28; PLC application-specific integrated circuit 29; And receive the front end 30 that sends signal of communication between the power line 20; Overlap signal of communication on the power line 20 or the signal of communication on the power line 20 is taken out and supplies with for each functional circuit that constitutes modulator-demodulator the power circuit unit 31 of direct current power by exchanging with plug; Display units such as LED 32.
In above-mentioned, in EEPROM 25 and flicker ROM 26, store PLC modulator-demodulator shown in Figure 2 for realizing as the necessary program of handling of carrying out by CPU23 of the function of modulator-demodulator, about be intended to and power line 20 between the information of the communication mode that communicates, setting signal sends the data with the intensity of power of communications, information such as data transfer rate.
Fig. 3 represents the structured flowchart of the power circuit unit 31 of PLC modulator-demodulator shown in Figure 2.At Fig. 3, L2 is an inductor, and BPF2 is a band pass filter, and the situation of other symbols and Fig. 4 is identical.
The difference of the conventional art that power circuit unit 31 shown in Figure 3 and Fig. 4 are illustrated is: the band pass filter that is connected with front end as the PLC signal circuit of PLC modulator-demodulator is non-symmetric type band pass filter BPF2 this point; The connection of the mains side of band pass filter BPF2 is to carry out this point for direct-current power supply terminals P 1 (also can be terminals P 2, P3); And AC plug 39 and rectification are with not needing to be provided with filter circuit 38 this point between the diode bridge 35.Other structures can be with identical by the illustrated power circuit of Fig. 4.
So, should overlap the transmission signal Tx on the power line from the PLC signal circuit of modem dedicated for electric line communication, through asymmetric band pass filter BPF2, decoupling zero electricity consumption container C 8, be added on the direct-current power supply terminals P 1, overlap on the power line through rectification circuit, power transformer T1, switching circuit 36, the diode bridge 35 that constitutes power circuit.In addition, send to the signal on the power line, pass through and above-mentioned opposite path, be sent to the PLC signal circuit of modem dedicated for electric line communication as received signal Rx.In this case, send signal Tx, superimposed on DC power supply from the signal of communication of power line, in order not enter the functional circuit of PLC modulator-demodulator, between the tie point of the mains side of direct-current power supply terminals P 1 and band pass filter BPF2, be provided with to isolate and use inductor L2.
Next, in above-mentioned structure, pass through to supply with the situation of the power circuit unit of DC power supply to the functional circuit of PLC modulator-demodulator for the dedicated for electric line communication signal, to send signal Tx is example, this signal is described from direct-current power supply terminals P 1, arrives the situation of power line through rectification circuit, power transformer T1, switching circuit 36, diode bridge 35.
Smoothing capacitor C1, C4 that rectification circuit comprised in the power circuit unit of supply DC power supply are made of electrolytic capacitor usually.Known, big if the frequency that is applied becomes, then the impedance of this electrolytic capacitor becomes big.For this reason, the transmission signal Tx of the 4MHz～20MHz that is applied can not shunted by these capacitors.In addition, adjuster R1 is made of IC usually, and the transmission signal is directly passed through.In addition, because rectification becomes Low ESR for AC signal with diode D1 in the state that electric current flows through, thereby transmission signal Tx also can directly pass through diode D1.Because power transformer T1 carries out AC transformation, and has parasitic capacitance between primary coil and secondary coil, thereby transmission signal Tx can pass through power transformer T1.
Further, switching circuit 36 is made of IC usually, and transmission signal Tx is directly passed through.Diode bridge 35, though produce bigger decay to sending signal Tx, if, send the decay that signal Tx only is subjected to the 30db degree according to the inventor's etc. experiment.Therefore, the overall attenuation from direct-current power supply terminals P 1 to the transmission signal Tx the power line is the degree of 40db.From the level of the transmission signal of modem dedicated for electric line communication, enough big, even there is the situation of 40db degree decay, communicate with can keeping certain surplus.
In addition, the situation for the decay of signal of communication that will be by above-mentioned diode bridge is done forr a short time also can be connected in parallel such as high-pass filtering circuit such as low value capacitors on diode bridge.
Employed power circuit unit in the execution mode of the invention described above is though constitute by the circuit that carries out the AC-DC-AC conversion in the primary side setting of power transformer.Yet the present invention also can make the power circuit unit source power supply directly is connected structure on the primary coil of power transformer.In this case, with above-mentioned the same, can signal of communication be overlapped on the power line by the power circuit unit.
In addition, the execution mode of the invention described above, although understand PLC modulator-demodulator and power circuit unit one formation, still, the present invention is applicable to that also power circuit is the structure as the parts different with the PLC modulator-demodulator.
According to the execution mode of the invention described above, can not need the dedicated for electric line communication signal overlap to power line and be used to separate signal overlap transformer, and make the dedicated for electric line communication signal not enter the filter of power circuit from the signal of power line.In addition, owing to can use at a low price asymmetric band pass filter, therefore can seek to comprise the simplification of circuit structure of PLC modulator-demodulator of power circuit and the reduction of cost to substitute the symmetric type band pass filter of high price.
Claims (4)
1, a kind of method of modem dedicated for electric line communication to the power line overlapped signal, described modem dedicated for electric line communication comprises:
Power transformer, its primary coil is connected with described power line; And
Rectification circuit, it has the direct-current power supply terminal, for the formation machine of the described modem dedicated for electric line communication on the secondary coil of this power transformer is supplied with DC power supply;
To supply to described direct-current power supply terminal from the signal of the dedicated for electric line communication signal circuit of described modem dedicated for electric line communication, signal of communication is overlapped on the described power line, to pass through described direct-current power supply terminal from the signal of communication of described power line, be sent to described dedicated for electric line communication signal circuit.
2, the method to the power line overlapped signal of modem dedicated for electric line communication according to claim 1 is characterized in that,
The transmission of the signal between described dedicated for electric line communication signal circuit and the described direct-current power supply terminal receives, and is undertaken by the asymmetric band pass filter that is arranged between described dedicated for electric line communication signal circuit and the described direct-current power supply terminal.
3, a kind of modem dedicated for electric line communication in the modem dedicated for electric line communication that communicates to the power line overlapped signal, comprising:
Power transformer, its primary coil is connected with described power line; And
Rectification circuit, it has the direct-current power supply terminal, for the formation machine of the described modem dedicated for electric line communication on the secondary coil of this power transformer is supplied with DC power supply;
The dedicated for electric line communication signal circuit of described modem dedicated for electric line communication is connected with described direct-current power supply terminal, so that will supply to described direct-current power supply terminal from the signal of communication of the dedicated for electric line communication signal circuit of described modem dedicated for electric line communication, signal of communication is overlapped described power line, will be from the signal of communication of described power line, by described direct-current power supply terminal, be sent to described dedicated for electric line communication signal circuit.
4, modem dedicated for electric line communication according to claim 3 is characterized in that, between described dedicated for electric line communication signal circuit and described direct-current power supply terminal, has asymmetric band pass filter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004279472 | 2004-09-27 | ||
| JP2004279472A JP2006094308A (en) | 2004-09-27 | 2004-09-27 | Method for superimposing signal in power line communication modem, and power line communication modem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1756111A true CN1756111A (en) | 2006-04-05 |
Family
ID=36234825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510106866 Pending CN1756111A (en) | 2004-09-27 | 2005-09-27 | Modem for power line communication and signal superposition method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006094308A (en) |
| CN (1) | CN1756111A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103155432A (en) * | 2010-10-20 | 2013-06-12 | 株式会社巨晶片 | Plc/power supply hybrid device and device with communication function |
| CN105429677A (en) * | 2011-05-16 | 2016-03-23 | 索尼公司 | Power line communication modem, power line communication system, and power line communication method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5164455B2 (en) * | 2007-07-05 | 2013-03-21 | 株式会社日立メディコ | Maintenance information collection system |
| US11314316B2 (en) * | 2018-05-21 | 2022-04-26 | Mitsubishi Electric Corporation | Modem to selectively superpose electric power |
-
2004
- 2004-09-27 JP JP2004279472A patent/JP2006094308A/en not_active Withdrawn
-
2005
- 2005-09-27 CN CN 200510106866 patent/CN1756111A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103155432A (en) * | 2010-10-20 | 2013-06-12 | 株式会社巨晶片 | Plc/power supply hybrid device and device with communication function |
| CN103155432B (en) * | 2010-10-20 | 2015-09-30 | 株式会社巨晶片 | PLC/ power supply mixing arrangement and there is the device of communication function |
| US9369178B2 (en) | 2010-10-20 | 2016-06-14 | Megachips Corporation | PLC/power-supply hybrid device and device with communication function |
| CN105429677A (en) * | 2011-05-16 | 2016-03-23 | 索尼公司 | Power line communication modem, power line communication system, and power line communication method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006094308A (en) | 2006-04-06 |
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