CN207460169U - A kind of system that can inhibit power carrier signal attenuation - Google Patents

Abstract

The utility model discloses a kind of systems that can inhibit power carrier signal attenuation, and including power line and the user load for being connected to the power line terminal, the power line is used for simultaneous transmission Alternating Current Power Supply signal and power carrier signal；It is characterized in that：Signal control module is connected on the power line, the signal control module is often opening for the Alternating Current Power Supply signal, it is opened for the power carrier signal for normal off, so that the user load is not connected with the carrier signal, inhibit attenuation of the user load to the carrier signal.The utility model ensures that carrier signal is well between carrier terminal, reliably transfers.

Description

A kind of system that can inhibit power carrier signal attenuation

Technical field

The utility model is related to power carrier communication technical fields, and in particular to one kind can inhibit power carrier signal attenuation System.

Background technology

Power carrier communication (Power line Communication abbreviation PLC) is to be transmitted using power line as information The information of required transmission is carried out the technology of high-speed transfer by medium, with high reliability, survivability it is strong, without frame If the characteristics of special circuit and grown rapidly, this communication modes are now widely used in power department automatic management Carrier path is by communication etc. in electric energy meter low-voltage collecting meter reading system, home intelligence communication.Numerous production firms have been introduced respectively The terminal devices such as the carrier communication electric energy meter of kind of model, carrier acquisition terminal organ, carrier wave concentrator, carrier wave router, Homeplug For users to use, carrier electric energy meter low-voltage collecting meter reading system has obtained the application of large area in electric administrative department at present.

It is found in the actual application of power department, China generates power grid the electrical equipment for accessing power grid at present Pollution there is no pressure standard, cause low voltage electric network seriously polluted, in addition washing machine common in customer charge, television set, day The electrical equipments such as light lamp, hair dryer, refrigerator, air-conditioning, elevator can make the input impedance of power circuit, load change, from And make power carrier signal that serious distortion and attenuation occur, cause communication failure, meter reading success rate is low.

Either manufacturer or site operation personnel once has found this problem, and following approach is generally taken to solve：

1st, the signal strength of carrier wave transmitter unit is increased；

2nd, repeater is increased between electric energy meter and collector；

3rd, solved by routing algorithm；

Meter reading when the 4th, selecting, under normal circumstances, in the time-division at midnight, customer charge has largely all been stopped, on power grid Various interference signals substantially reduce, and meter reading success rate is higher.

For the first solution, because country will to the carrier signal strength finite value of carrier units input electric power circuit It asks, it is impossible to which unlimited to improve, the influence of power grid user load in addition, effect is nor very well.

For second of solution, it is necessary to increase construction cost.

For the third solution, suitable for the densely distributed situation of user's electric energy meter, the electric energy meter of each user It is configured to undertake the electric energy meter of relay function, delivers in relays between each other.If user's electric energy meter is more dispersed, Effect is not had.

For the 4th kind of solution, some electric administrative departments regulation sets collection period, collector in collector Carry out automatic data logging by collection period, if copying and accepting unsuccessful, just copied and accepted again in next collection period, one day 24 it is small when it is interior As long as have it is any once copy and accept success, the same day just stops copying and accepting.Though this allows and can realize and freeze copying and accepting for electricity, use can not achieve Power consumption parameter monitoring in real time in family is a kind of adaptation with copying and accepting.

Utility model content

We have found that the means that tradition solves carrier communication quality are mainly the intensity for the signal for increasing communication, increase signal Relaying increases signal input intensity, improves receiving sensitivity etc..The thought of the utility model is：In existing signal strength feelings Under condition, optimize signal transmission passage, it is made to be more suitable for the transmission of signal, reduce transmission loss, signal-to-noise ratio is improved, so as to improve Carrier communication quality.

In view of this, in order to solve above-mentioned technical problem of the prior art, the utility model proposes a kind of inhibition electric power The solution of carrier signal attenuation, makes meter reading success rate be greatly improved, and substantially may be implemented in any time supervises in real time It surveys and copies and accepts.

The utility model is solved the above problems by following technological means：

A kind of system that can inhibit power carrier signal attenuation, including power line and is connected to the power line terminal User load, the power line are used for simultaneous transmission Alternating Current Power Supply signal and power carrier signal；It is characterized in that：The electric power Signal control module is connected on line, the signal control module is often opening for the Alternating Current Power Supply signal, for described Power carrier signal is opened for normal off, so that the user load is not connected with the carrier signal, inhibits the user and bears Carry the attenuation to the carrier signal.

The power carrier signal is generated by a carrier terminal being connected on the power line or multiple carrier terminals Interactive communication generates, and the signal control module is mounted on the power line between the carrier terminal and the user load On.

Preferably, further, the Alternating Current Power Supply signal is AC220V/50Hz alternating currents.

The signal control module includes magnetic core, first coil, the second coil, tertiary coil, magnetic flux monitoring modular, magnetic Flux reversal compensating module；First coil, the second coil, tertiary coil are wound on magnetic core, two taps connection of the second coil The input terminal of magnetic flux monitoring modular, the input terminal of the output terminal connection magnetic flux Contrary compensation module of magnetic flux monitoring modular, Two taps of the output terminal connection tertiary coil of magnetic flux Contrary compensation module, two taps of first coil are connected to electric power In circuit；50Hz electric power signals can generate a magnetic flux after flowing through first coil, which can generate in first coil One reverse potential E1, the magnetic flux can equally generate induced voltage signal on the second coil, and magnetic flux monitoring modular is real-time The induced voltage signal is monitored, which is done reverse phase, enhanced processing by magnetic flux Contrary compensation module, to the 3rd line Circle applies a voltage signal E2 equal in magnitude with reverse potential E1, direction is opposite, so as to offset electric power signal in First Line The reverse potential E1 generated on circle, the vector sum for making E1 and E2 are zero, so that it is guaranteed that electric power signal will not be at first coil both ends Generate pressure drop and loss；It is not equal to the power carrier signal of 50Hz for signal frequency, magnetic flux monitoring modular is disregarded, the One coil can generate it π fL of inductive reactance xl=2, and power carrier signal is hindered to pass through.

Preferably, the magnetic core is toroidal core.

Further, the magnetic flux detection module includes the second amplifier, and the inverting input of the second amplifier passes through 6th resistance connects the output terminal of the second amplifier, and the inverting input of the second amplifier connects the 4th capacitance by the 4th resistance One end, the other end of the 4th capacitance passes through the normal phase input end that the 7th resistance connects the second amplifier, one end of the 4th capacitance One end of the 3rd capacitance is connected by the 5th resistance, the other end of the 3rd capacitance connects the other end and the ground connection of the 4th capacitance, the One end of three capacitances connects the second coil by a tap of second the second coil of inductance connection, the other end of the 3rd capacitance Another tap.

Further, the magnetic flux Contrary compensation module includes the first amplifier, the normal phase input end of the first amplifier The AGND ends of connector P1 are connected to by second resistance, the positive power source terminal of the first amplifier is connected to the+12V of connector P1 End, the negative power end of the first amplifier are connected to the -12V ends of connector P1, and the inverting input of the first amplifier passes through the 3rd Resistance connects the output terminal of the second amplifier, and the inverting input of the first amplifier connects the first amplifier by first resistor Output terminal, the inverting input of the first amplifier by the output terminal of first the first amplifier of capacitance connection, the first amplifier For output terminal by one end of the 3rd the second capacitance of inductance connection, one end of the second capacitance passes through the first inductance connection tertiary coil One tap, another tap of the other end connection tertiary coil of the second capacitance are simultaneously grounded.

Further, the number of turn of the first coil is 1.

The system that another kind can inhibit power carrier signal attenuation, the signal control module are magnetic bead.

The system that another kind can inhibit power carrier signal attenuation, the signal control module are reactor.

Compared with prior art, the beneficial effects of the utility model are as follows：

The utility model can effectively inhibit power carrier signal attenuation, and it is suitable to ensure that carrier signal carries out between carrier terminal Profit is reliably transferred；

The utility model can also solve the problems, such as that carrier wave router suspension goes offline；

The real-time collection that the utility model cannot be only used for electric energy meter low-voltage collecting meter reading system is copied, every using power network as communication The situation that carrier communicates is all suitable for.

Description of the drawings

It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.

Fig. 1 is the circuit diagram using power line carrier, PLC；

Fig. 2 is the circuit diagram that the utility model inhibits power carrier signal damping solution embodiment 1；

Fig. 3 is the structure diagram of the utility model signaling control unit；

Fig. 4 is the utility model magnetic flux monitoring modular and the circuit diagram of magnetic flux Contrary compensation module；

Fig. 5 is the circuit diagram that the utility model inhibits power carrier signal damping solution embodiment 2；

Fig. 6 is the circuit diagram that the utility model inhibits power carrier signal damping solution embodiment 3.

Specific embodiment

To enable the above-mentioned purpose of the utility model, feature and advantage more obvious understandable, below in conjunction with attached drawing and The technical solution of the utility model is described in detail in specific embodiment.It is pointed out that described embodiment is only Only it is the utility model part of the embodiment, instead of all the embodiments, based on the embodiment in the utility model, this field Those of ordinary skill's all other embodiments obtained without making creative work, belong to the utility model The scope of protection.

Embodiment 1

By in large quantities the study found that power line carrier, PLC is as follows the main reason for failure：What power carrier terminal was sent After carrier signal is sent to by termination power in power circuit, in the shadow of the factors such as user load, interference signal, line impedance Under sound, barrier signal level is significantly decayed, and in receiving terminal, barrier signal level is very small by even zero, so as to cause Communication failure.And in these influence factors, what is played a decisive role is consumption of the user load to carrier signal.

As shown in Figure 1, by taking low-voltage circuit as an example, Ri represents user load, is added in power circuit there are two AC signal, One is AC220V/50Hz electric power signals, the other is the electric power that carrier terminal 1 and carrier terminal 2 are sent in interactive communication Carrier signal, depending on the type of carrier module, the frequency range of narrowband carrier signal generally exists the frequency of power carrier signal 1KHz~500KHz；The frequency range of broadband carrier signal is generally in 1MHz~30MHz；As seen from Figure 1, since user bears The presence of load, AC220V/50Hz AC signals want consumed energy on user load, and equally, power carrier signal PLC equally will Consumed energy, AC220V/50Hz have enough power designs to match with user load, work normally user load.And it carries Ripple signal is communicated by means of power circuit, and there is stringent regulation in signal transmission power country, it is impossible to as AC220V/50Hz signals match like that with user load, so, carrier signal is once sent in power circuit, runs into use Family loads, and will generate energy consumption, and rapid to decay, the level after attenuation is difficult to be detected and effectively identified by terminal, so as to cause Normal communication is unable between two terminals.

For such situation, the utility model proposes a solution, as shown in Figure 2.

Increase a signaling control unit between carrier terminal and user load, this signaling control unit is at any time to electricity The AC signal of line of force road is monitored and starts interlock circuit, for the AC signal of AC220V/50Hz, the control of this signal Unit is equivalent to a through swtich, and for other AC signals of non-50Hz, this signaling control unit is equivalent to one and breaks The switch opened, then, except the AC signal of AC220V/50Hz, carrier signal would not be influenced by user load, Bu Hui Consumed energy on user load, would not also generate attenuation, carrier signal kept on power circuit enough signal strength from And ensure reliable communication between two terminals.

Signaling control unit monitors mould by toroidal core, first coil N1, the second coil N2, tertiary coil N3, magnetic flux Block, magnetic flux Contrary compensation module composition, as shown in Figure 3.

The utility model provides a kind of signaling control unit for inhibiting power carrier signal attenuation, including toroidal core, the One coil N1, the second coil N2, tertiary coil N3, magnetic flux monitoring modular and magnetic flux Contrary compensation module.

First coil N1, the second coil N2, tertiary coil N3 are wound on toroidal core, and two taps of the second coil N2 connect Connect the input terminal of magnetic flux monitoring modular, the input of the output terminal connection magnetic flux Contrary compensation module of magnetic flux monitoring modular End, two taps of the output terminal connection tertiary coil N3 of magnetic flux Contrary compensation module, two taps of first coil N1 connect It is connected in power circuit.

For AC220V/50Hz signals, an inductance coil N1 is sealed in power circuit, under normal conditions this The number of turn of coil is that flow through the voltage before this coil be U1 to 1, AC220V/50Hz AC signals, flows through the electricity after this coil It presses as U2, according to magnetic induction principle, AC220V/50Hz AC signals can generate a magnetic flux after flowing through this coil, this Magnetic flux can generate a reverse induction potential E1 on N1 and be superimposed upon in original signal, so that U2=U1-E1 ﹤ U1, then, it arrives Voltage up to customer charge is lower than its rated voltage, can make user load cisco unity malfunction, this is either to electrical management All it is unacceptable for department or user.

For this purpose, to be specially provided with induction coil a N2, AC220V/50Hz same in the magnetic flux that N1 is generated for the utility model Sample can generate induced voltage signal on N2, and magnetic flux monitoring modular can monitor this voltage signal, magnetic flux Contrary compensation This voltage signal can be done reverse phase, enhanced processing by module, apply one and E1 equal in magnitude, the opposite electricity in direction to coil N3 Signal E2 is pressed, so as to offset the reverse potential E1 that AC220V/50Hz is generated on N1, the vector sum for making E1 and E2 is zero, i.e. E1+ E2=0.Further, U2=U1 is made, then for inductance coil N1, the air core coil that a number of turn is 1 is equivalent to, AC220V/50Hz AC signals uncrossed can pass through, and will not generate pressure drop and loss at N1 both ends.

For power carrier signal, reference carrier frequency is between 1kHz~30MHz, for this kind of signal, magnetic flux Monitoring modular is disregarded, and coil N1 can generate it π fL of inductive reactance xl=2, and signal is hindered to pass through.Signal frequency is cured Greatly, induction reactance is bigger.Since carrier signal can not would not also be reached user load, will not more be born in user by this coil Attenuation is generated in load, is reliably transferred so as to ensure that carrier signal is smoothly transferred between carrier terminal.

As shown in figure 4, the magnetic flux detection module includes the second amplifier U1B, the anti-phase input of the second amplifier U1B End passes through the output terminal of the 6th resistance R6 the second amplifiers of connection U1B, and the inverting input of the second amplifier U1B passes through the 4th electricity One end of the 4th capacitance C4 of R4 connections is hindered, the other end of the 4th capacitance C4 passes through the 7th resistance R7 the second amplifiers of connection U1B's Normal phase input end, by one end of the 3rd capacitance C3 of the 5th resistance R5 connections, the 3rd capacitance C3's is another for one end of the 4th capacitance C4 One end connects the other end of the 4th capacitance C4 and ground connection, one end of the 3rd capacitance C3 pass through second inductance L2 the second coils of connection N2 A tap, the other end of the 3rd capacitance C3 connects another tap of the second coil N2.

The magnetic flux Contrary compensation module includes the first amplifier U1A, and the normal phase input end of the first amplifier U1A passes through Second resistance R2 is connected to the AGND ends of connector P1, and the positive power source terminal of the first amplifier U1A is connected to the+12V of connector P1 End, the negative power end of the first amplifier U1A are connected to the -12V ends of connector P1, and the inverting input of the first amplifier U1A leads to The output terminal of 3rd resistor R3 the second amplifiers of connection U1B is crossed, the inverting input of the first amplifier U1A passes through first resistor R1 The output terminal of the first amplifier U1A is connected, the inverting input of the first amplifier U1A is amplified by the first capacitance C1 connections first The output terminal of device U1A, the output terminal of the first amplifier U1A pass through one end of the 3rd inductance L3 the second capacitances of connection C2, the second electricity Hold one end of C2 by a tap of the first inductance L1 connection tertiary coils N3, the other end of the second capacitance C2 connects the 3rd line It encloses another tap of N3 and is grounded.

By a large amount of field tests, it was demonstrated that the method can solve the situation that carrier communication success rate is low, unstable completely.

Signaling control unit can regard a product for purpose described in the utility model, be also used as one and match somebody with somebody Part is mounted in the equipment such as electric energy meter, breaker, distribution network cabinet, realizes same purpose.

Since the utility model is with obvious effects, of simple structure and low cost, it may also be used in high-voltage electric power circuit, to take For traditional cost is high, area occupied is big, volume is heavy and the carrier wave trap of less effective.

The frequency range of alternating current is 50Hz~60Hz, the 50Hz described in the utility model be actually 50Hz~ 60Hz。

Embodiment 2

As shown in figure 5, increasing magnetic bead between carrier terminal and user load, magnetic bead can generate impedance to carrier signal, Realize the purpose that carrier signal is avoided to generate attenuation on user load.

Embodiment 3

As shown in fig. 6, increasing reactor between carrier terminal and user load, reactor can generate resistance to carrier signal It is anti-, realize the purpose that carrier signal is avoided to generate attenuation on user load.

Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed, But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be with appended right.

Claims (9)

1. a kind of system that can inhibit power carrier signal attenuation, including power line and the use for being connected to the power line terminal Family loads, and the power line is used for simultaneous transmission Alternating Current Power Supply signal and power carrier signal；It is characterized in that：The power line On be connected with signal control module, the signal control module for the Alternating Current Power Supply signal often to open, for the electricity Power carrier signal is opened for normal off, so that the user load is not connected with the carrier signal, inhibits the user load Attenuation to the carrier signal.

2. system according to claim 1, it is characterised in that：The power carrier signal is by being connected on the power line A carrier terminal generate or multiple carrier terminal interactive communications generate, the signal control module be mounted on the carrier wave On the power line between terminal and the user load.

3. system according to claim 1 or 2, it is characterised in that：The Alternating Current Power Supply signal is AC220V/50Hz cities Electricity.

4. system according to claim 3, it is characterised in that：The signal control module includes magnetic core, first coil, the Two coil, tertiary coil, magnetic flux monitoring modular, magnetic flux Contrary compensation module；First coil, the second coil, tertiary coil It is wound on magnetic core, the input terminal of two taps connection magnetic flux monitoring modular of the second coil, the output of magnetic flux monitoring modular The input terminal of end connection magnetic flux Contrary compensation module, two of the output terminal connection tertiary coil of magnetic flux Contrary compensation module Tap, two taps of first coil are connected in power circuit；50Hz electric power signals can generate one after flowing through first coil Magnetic flux, the magnetic flux can generate a reverse potential E1 in first coil, which can equally produce on the second coil Raw induced voltage signal, magnetic flux monitoring modular monitor the induced voltage signal in real time, and magnetic flux Contrary compensation module feels this Voltage signal is answered to do reverse phase, enhanced processing, applies an electricity equal in magnitude with reverse potential E1, direction is opposite to tertiary coil Signal E2 is pressed, so as to offset the reverse potential E1 that electric power signal generates in first coil, the vector sum for making E1 and E2 is zero, from And pressure drop and loss will not be generated at first coil both ends by ensuring electric power signal；It is not the power carrier of 50Hz for signal frequency Signal, magnetic flux monitoring modular are disregarded, and first coil can generate it π fL of inductive reactance xl=2, hinder power carrier letter It number passes through.

5. system according to claim 4, it is characterised in that：The magnetic core is toroidal core.

6. system according to claim 4, it is characterised in that：The magnetic flux detection module includes the second amplifier, the The inverting input of two amplifiers connects the output terminal of the second amplifier, the inverting input of the second amplifier by the 6th resistance One end of the 4th capacitance is connected by the 4th resistance, the other end of the 4th capacitance is connecting the second amplifier just by the 7th resistance Phase input terminal, one end of the 4th capacitance connect one end of the 3rd capacitance by the 5th resistance, the other end connection of the 3rd capacitance the The other end of four capacitances and ground connection, one end of the 3rd capacitance pass through a tap of second the second coil of inductance connection, the 3rd electricity The other end of appearance connects another tap of the second coil.

7. system according to claim 6, it is characterised in that：The magnetic flux Contrary compensation module includes the first amplification Device, the normal phase input end of the first amplifier are connected to the AGND ends of connector P1, the positive electricity of the first amplifier by second resistance Source is connected to the+12V ends of connector P1, and the negative power end of the first amplifier is connected to the -12V ends of connector P1, and first puts The inverting input of big device connects the output terminal of the second amplifier by 3rd resistor, and the inverting input of the first amplifier passes through First resistor connects the output terminal of the first amplifier, and the inverting input of the first amplifier is amplified by the first capacitance connection first The output terminal of device, by one end of the 3rd the second capacitance of inductance connection, one end of the second capacitance leads to the output terminal of the first amplifier A tap of the first inductance connection tertiary coil is crossed, another tap of the other end connection tertiary coil of the second capacitance simultaneously connects Ground.

8. system according to claim 4, it is characterised in that：The number of turn of the first coil is 1.

9. system according to claim 2, it is characterised in that：The signal control module is magnetic bead or reactor.