CN201869196U - Twisted-pair carrier communication circuit for automatic meter reading system - Google Patents
Twisted-pair carrier communication circuit for automatic meter reading system Download PDFInfo
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- CN201869196U CN201869196U CN2010206401915U CN201020640191U CN201869196U CN 201869196 U CN201869196 U CN 201869196U CN 2010206401915 U CN2010206401915 U CN 2010206401915U CN 201020640191 U CN201020640191 U CN 201020640191U CN 201869196 U CN201869196 U CN 201869196U
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Abstract
The utility model provides a twisted-pair carrier communication circuit for an automatic meter reading system, which comprises a receiving circuit and a sending circuit, wherein the sending circuit comprises a signal coupling circuit, a signal amplification circuit, a band-pass filtering circuit with the frequency of 50 kHz, a full-wave rectification circuit, a three-order low-pass filtering circuit and a hysteresis comparing and outputting circuit. The sending circuit includes a band-pass filter, a signal sending circuit, and a signal amplifying and sending circuit with a sending enable terminal. According to the utility model, carrier communication signals generated or received by the circuits meet all requirements in IEC62056-31 standard established for modulating signal parameters and demodulating signal parameters. Meanwhile, the twisted-pair carrier communication circuit has a simple structure, is safe and reliable and meets the electromagnetic compatibility experimental requirements of electric energy meter.
Description
Technical field
The utility model is when in the electric power system local area network (LAN) electric energy meter being carried out automatic copy reading, employed twisted-pair feeder carrier signal transmitting-receiving hardware circuit.Signal parameter after the circuit modulation meets the requirement for EURIDIS and TIC signal of communication fully.
Background technology
The communication function of intelligent electric meter and the establishment of Automatic meter reading system receive much concern always and pay attention to.The nineties in last century, adopt the kilowatt meter reading-out system of EURIDIS bus to introduce China.It is a kind of efficient, the scheme of checking meter cheaply.Electric energy meter is connected to be fixed on by the EURIDIS bus and is easy to copy and accept on the locational magnetic coupler, and the person of checking meter only needs handheld terminal is connected with coupler can realize that the information that all is connected electric energy meter with coupler copies and accepts.
The EURIDIS kilowatt meter reading-out system has following characteristics:
(1) opening: the EURIDIS agreement meets the IEC62056-31 standard, guarantees the opening and the interoperability of different manufacturers equipment room;
(2) convenience: the EURIDIS kilowatt meter reading-out system has been saved the time of copying and accepting greatly, and 100 ammeters can be copied in 5 minutes.
(3) popularity: the EURIDIS system has operated tens days under the popularization of company of group of Electricite De France (ERDF), during system's performance reliably obtained the approval of ERDF and promoted energetically.The EURIDIS system is used by more and more countries such as West Europe at present.
(4) communication medium: adopt twisted-pair feeder 50kHz carrier communication mode, stronger anti-interference and farther transmission range when guaranteeing the signal transmission;
(5) traffic rate: the standard of the up-to-date proposition of ERDF has been brought up to 9600bps to communication speed;
(6) confidentiality: in order to prevent third-party manipulative communications deception and the monitoring to communicating by letter, whole EURIDIS communication adopts the AES128 cryptographic algorithm that communication data is carried out encryption and decryption.
Therefore, the EURIDIS kilowatt meter reading-out system satisfies the demand for development of current intelligent grid Automatic meter reading system fully.The IEC62056-31 standard has very strict requirement for the carrier signal of EURIDIS system, no matter be to transmission rate, signal frequency or signal amplitude, parameters such as duty ratio all have strict requirement, also these make that the EURIDIS system can be reliable just, realize efficiently articulating the information copy reading of ammeter.Owing to, make that the realization on the EURIDIS hardware circuit becomes complicated difficult, the at present domestic hardware circuit that does not also satisfy the ERDF requirement preferably to the strict demand of carrier signal parameter.
Summary of the invention
To be solved in the utility model is the problems referred to above that prior art exists, and aims to provide a kind of hardware circuit that satisfies EURIDIS and the requirement of TIC signal of communication simultaneously.
The technical scheme that addresses the above problem employing is as follows: be used for the twisted-pair feeder carrier communication circuit of Automatic meter reading system, comprise receiving circuit and transtation mission circuit, it is characterized in that described receiving circuit comprises:
Signal coupling circuit receives the EURIDIS carrier signal, and output is every straight back carrier signal behind capacitor C 6 isolated DCs and coupling transformer T1;
Signal amplification circuit is amplified to amplitude saturated back output with what signal coupling circuit was exported every straight carrier signal;
The 50kHz bandwidth-limited circuit, the interference signal of all frequencies in the saturated carrier signal of filtered signal amplifying circuit output except that 50kHz;
Full-wave rectifying circuit carries out full-wave rectification with the carrier signal after the filtering interfering of 50kHz bandwidth-limited circuit output, output direct current carrier signal;
Three rank low-pass filter circuits carry out low-pass filtering to the direct current carrier signal of full-wave rectifying circuit output, become approximate square-wave signal;
The chain rate that stagnates reaches output circuit, and the approximate square-wave signal that three rank low-pass filter circuits are exported stagnates chain rate, exports square-wave signal preferably;
Described transtation mission circuit comprises:
Band pass filter generates the square-wave signal of 50kHz and is used for the 50kHz sinusoidal signal that carrier wave sends;
Signal sending circuit uses analog switch that the 50kHz sinusoidal signal of band pass filter output is switched, and realizes 0,1 transmission of carrier signal;
The signal that band sends Enable Pin amplifies transtation mission circuit, and the carrier signal of the output of signal sending circuit is sent on the EURIDIS connecting line through amplifying circuit and signal coupling circuit.
The twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system of the present utility model uses this circuit to produce or the carrier communication signal that receives satisfies in the IEC62056-31 standard of all requirements to(for) modulation signal and restituted signal parameter.Wherein EURIDIS communication can be sent out and can receive for half-duplex circuit; TIC is unidirectional, sends out only, can not receive.Simultaneously, the utility model circuit structure is simple, and is safe and reliable, meets each electromagnetic compatibility requirement of experiment of electric energy meter.
According to the utility model, described signal coupling circuit comprises capacitor C 6, capacitor C 8, capacitor C 21, diode D154, diode D155, resistance R 14, resistance R 28 and coupling transformer T1, described capacitor C 8 one termination EURIDIS import 1 end, one end of the end of the other end connecting resistance R28 of capacitor C 8 and the former limit of coupling transformer T1 winding, another termination EURIDIS of resistance R 28 imports the other end of 2 ends and the former limit of coupling transformer T1 winding, the end of one termination capacitor C21 of coupling transformer T1 secondary winding and an end of resistance R 14, the other end and the signal ground of another termination capacitor C 21 of coupling transformer T1 secondary winding, one end of another termination capacitor C 6 of resistance R 14, the anode of another terminating diode D154 of capacitor C 6 and the negative electrode of diode D155, also be signal output part simultaneously, the negative electrode of diode D154 connects power positive end, the plus earth of diode D155.
According to the utility model, described signal amplification circuit comprises capacitor C 1, capacitor C 101, resistance R 1, resistance R 2 and an operational amplifier, one end of described capacitor C 1 is an input, the end of other end connecting resistance R1, the input negative terminal of one end of another termination capacitor C 101 of resistance R 1, an end of resistance R 2 and operational amplifier, the other end of the other end connecting resistance R2 of capacitor C 101 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.
According to the utility model, described 50kHz bandwidth-limited circuit comprises resistance R 156, resistance R 151, resistance R 157, capacitor C 150, capacitor C 151 and an operational amplifier, described resistance R 156 1 ends are input, the end of other end connecting resistance R157, one end of capacitor C 150 and an end of capacitor C 151, the end of the other end connecting resistance R151 of capacitor C 150 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 151 of resistance R 151 and the output of operational amplifier, also be signal output part simultaneously, the positive termination signal ground of the other end of resistance R 157 and the input of operational amplifier.
According to the utility model, described full-wave rectifying circuit comprises resistance R 152, resistance R 150, resistance R 158, diode D150, diode D151, first operational amplifier, resistance R 170, resistance R 160, resistance R 161, diode D152, diode D153, second operational amplifier, resistance R 154 and the 3rd operational amplifier, one end of described resistance R 152 is an input, the end of other end connecting resistance R150, the input negative terminal of the negative electrode of diode D150 and first operational amplifier, the anode of another terminating diode D151 of resistance R 150 and an end of resistance R 158, the anode of diode D150 connects the negative electrode of diode D151 and the output of first operational amplifier, the positive termination signal ground of the input of first operational amplifier; Resistance R 170 ends are input, the input negative terminal of the end of other end connecting resistance R160, diode D152 negative electrode and second operational amplifier, an another terminating diode D153 anode of resistance R 160 and an end of resistance R 161, the anode of diode D152 connects the negative electrode of diode D153 and the output of second operational amplifier, the positive termination signal ground of the input of second operational amplifier; The other end of the other end connecting resistance R161 of resistance R 158, an end of resistance R 154 and the input negative terminal of the 3rd operational amplifier, the output of another termination the 3rd operational amplifier of resistance R 154, the positive termination signal ground of the input of the 3rd operational amplifier.
According to the utility model, described three rank low-pass filter circuits comprise resistance R 3, resistance R 165, capacitor C 2, capacitor C 154, resistance R 166, capacitor C 156, capacitor C 153 and an operational amplifier, one end of described resistance R 3 is an input, the end of other end connecting resistance R165 and an end of capacitor C 2, the end of the other end connecting resistance R166 of resistance R 165 and an end of capacitor C 154, the input negative terminal and the output of another termination operational amplifier of capacitor C 154, one end of another termination capacitor C 156 of resistance R 166 and the input anode of operational amplifier, another termination signal ground of capacitor C 2 and capacitor C 156, capacitor C 153 two ends connect power positive end and ground respectively.
According to the utility model, described stagnant chain rate reaches output circuit and comprises resistance R 163, resistance R 162, resistance R 171, an operational amplifier, resistance R 5 ground, resistance R 29, diode D1, diode D2, diode D3 and a triode, one end of described resistance R 163 is an input, the input anode of another termination operational amplifier, one termination power anode of resistance R 162, the end of other end connecting resistance R171 and the input negative terminal of operational amplifier, the end of the output connecting resistance R4 of operational amplifier and an end of resistance R 5, the anode of another terminating diode D1 of resistance R 5, the negative electrode of diode D1 connects the anode of diode D2, the negative electrode of diode D2 connects the anode of diode D3, the end of the negative electrode connecting resistance R29 of diode D3 and the base stage of triode, the collector electrode of triode connects EURIDIS RXD signal, the other end of resistance 171, the other end of resistance R 4, the other end of resistance R 29 and the grounded emitter of triode.
According to the utility model, described band pass filter comprises resistance R 16, resistance R 17, resistance R 18, capacitor C 22, capacitor C 23, capacitor C 24 and an operational amplifier, the square-wave signal of one termination 50kHz of described resistance R 17, one end of the end of other end connecting resistance R18, an end of capacitor C 22 and capacitor C 23, the end of the other end connecting resistance R16 of capacitor C 22 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 23 of resistance R 161 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.The square-wave signal of described 50kHz input is an external signal, perhaps produces by 555 timers by the utility model telecommunication circuit is inner.
According to the utility model, described signal sending circuit can directly adopt analog switching circuit according to different control signals, connects analog switching circuit again after also can overturning to level earlier.When adopting latter's structure, this signal sending circuit comprises two level reverse circuit and analog switching circuits that structure is identical, and wherein two level reverse circuits are respectively applied for and connect EURIDIS TXD and TIC TXD.A typical embodiment, the described level reverse circuit that is used to connect EURIDIS TXD comprises resistance R 19, resistance R 20, resistance R 21 and a triode, one termination EURIDIS TXD signal of described resistance R 19, the base stage of other end connecting resistance R21 and triode, one termination power anode of resistance R 20, the collector electrode of another termination triode and the input of analog switching circuit, the other end of resistance R 21 and the grounded emitter of triode.
According to the utility model, the signal amplification transtation mission circuit that described band sends Enable Pin comprises resistance R 10, resistance R 11, capacitor C 28 capacitor C 6, resistance R 14 and signal coupling circuit, one end of described resistance R 10 is an input, the input negative terminal of the end of other end connecting resistance R11, an end of capacitor C 28 and operational amplifier, the other end of another termination capacitor C 28 of resistance R 11, the output of operational amplifier and the input of signal coupling circuit, the positive termination signal ground of the input of operational amplifier.The shared same circuit of signal coupling circuit in described signal coupling circuit and the described receiving circuit.
As further improvement of the utility model, telecommunication circuit employing contact pin type interface of the present utility model and ammeter are interconnected, patch simple, safe and reliable.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the parameter characteristic figure of carrier envelope.
Fig. 2 is the signal coupling circuit figure of the utility model receiving circuit.
Fig. 3 is the signal amplification circuit figure of the utility model receiving circuit.
Fig. 4 is the 50kHz bandwidth-limited circuit of the utility model receiving circuit.
Fig. 5 is the full-wave rectifying circuit figure of the utility model receiving circuit.
Fig. 6 is three rank low-pass filter circuit figure of the utility model receiving circuit.
Fig. 7 is that the stagnant chain rate of the utility model receiving circuit reaches output circuit figure.
Fig. 8 is the band pass filter circuit figure of the utility model transtation mission circuit.
Fig. 9 is the signal sending circuit figure of the utility model transtation mission circuit.
Figure 10 is the signal amplification transtation mission circuit figure that the band of the utility model transtation mission circuit sends Enable Pin.
Figure 11 is the demodulation flow chart of the utility model receiving circuit to carrier signal.
Figure 12 is the modulation flow chart of the utility model transtation mission circuit to digital communication signal.
Embodiment
The twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system of the present utility model comprises receiving circuit and transtation mission circuit.Wherein EURIDIS communication can be sent out and can receive for half-duplex circuit; TIC communication is sent out only for unidirectional, can not receive.The TIC circuit is identical with the EURIDIS transtation mission circuit.
1.EURIDIS receiving circuit:
(1) signal coupling circuit;
With reference to Fig. 2, described signal coupling circuit comprises capacitor C 6, capacitor C 8, capacitor C 21, diode D154, diode D155, resistance R 14, resistance R 28 and coupling transformer T1, described capacitor C 8 one termination EURIDIS import 1 end, one end of the end of the other end connecting resistance R28 of capacitor C 8 and the former limit of coupling transformer T1 winding, another termination EURIDIS of resistance R 28 imports the other end of 2 ends and the former limit of coupling transformer T1 winding, the end of one termination capacitor C21 of coupling transformer T1 secondary winding and an end of resistance R 14, the other end and the signal ground of another termination capacitor C 21 of coupling transformer T1 secondary winding, one end of another termination capacitor C 6 of resistance R 14, the anode of another terminating diode D154 of capacitor C 6 and the negative electrode of diode D155, also be signal output part simultaneously, the negative electrode of diode D154 connects power positive end, the plus earth of diode D155.
The EURIDIS carrier signal enters receiving circuit by coupling transformer, capacitor C 6 isolated DCs, diode D154, D155 play the voltage protective effect, capacitor C 21 and coupling coil inductance be at 50kHz point parallel resonance, signal by the time can not produce phase shift.C8 is a safety electric capacity, and protection module EURIDIS line is connected with the 220V alternating current unintentionally.For satisfying in the standard to there being the input impedance under the 50kHz of Source Site to require (resistance＞20k, capacitive reactance is greater than 100k (30pF) during capacitive), satisfy signal amplitude simultaneously, through conversion of coupling transformer two ends parameter and test through coupling transformer output, select electric capacity 33nF, resistance 47K.
(2) signal amplification circuit;
With reference to Fig. 3, the TL084 chip that described signal amplification circuit adopts TI company to produce, comprise capacitor C 1, capacitor C 101, resistance R 1, resistance R 2 and an operational amplifier, one end of described capacitor C 1 is an input, the end of other end connecting resistance R1, the input negative terminal of one end of another termination capacitor C 101 of resistance R 1, an end of resistance R 2 and operational amplifier, the other end of the other end connecting resistance R2 of capacitor C 101 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.
Signal amplification circuit amplifies the AC signal that receives, and the carrier signal amplitude after the amplification just reaches the saturated output valve of amplifier, so that the low-pass filtering of rear end produces square wave preferably.Because amplifier power supply is unidirectional+9V power supply, and our EURIDIS signal is for exchanging carrier signal, thus the amplifier positive pole connect SGND (+4.5V).
(3) 50kHz bandwidth-limited circuit;
With reference to Fig. 4, described 50kHz bandwidth-limited circuit comprises resistance R 156, resistance R 151, resistance R 157, capacitor C 150, capacitor C 151 and an operational amplifier, described resistance R 156 1 ends are input, the end of other end connecting resistance R157, one end of capacitor C 150 and an end of capacitor C 151, the end of the other end connecting resistance R151 of capacitor C 150 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 151 of resistance R 151 and the output of operational amplifier, also be signal output part simultaneously, the positive termination signal ground of the other end of resistance R 157 and the input of operational amplifier.
The interference signal of all frequencies in the 50kHz bandwidth-limited circuit filtering received signal except that 50kHz.
(4) full-wave rectifying circuit;
With reference to Fig. 5, described full-wave rectifying circuit comprises resistance R 152, resistance R 150, resistance R 158, diode D150, diode D151, first operational amplifier, resistance R 170, resistance R 160, resistance R 161, diode D152, diode D153, second operational amplifier, resistance R 154 and the 3rd operational amplifier, one end of described resistance R 152 is an input, the end of other end connecting resistance R150, the input negative terminal of the negative electrode of diode D150 and first operational amplifier, the anode of another terminating diode D151 of resistance R 150 and an end of resistance R 158, the anode of diode D150 connects the negative electrode of diode D151 and the output of first operational amplifier, the positive termination signal ground of the input of first operational amplifier; Resistance R 170 ends are input, the input negative terminal of the end of other end connecting resistance R160, diode D152 negative electrode and second operational amplifier, an another terminating diode D153 anode of resistance R 160 and an end of resistance R 161, the anode of diode D152 connects the negative electrode of diode D153 and the output of second operational amplifier, the positive termination signal ground of the input of second operational amplifier; The other end of the other end connecting resistance R161 of resistance R 158, an end of resistance R 154 and the input negative terminal of the 3rd operational amplifier, the output of another termination the 3rd operational amplifier of resistance R 154, the positive termination signal ground of the input of the 3rd operational amplifier.
Full-wave rectifying circuit carries out full-wave rectification to the EURIDIS carrier signal that receives, the output direct current signal.
(5) three rank low-pass filter circuits;
With reference to Fig. 6, described three rank low-pass filter circuits comprise resistance R 3, resistance R 165, capacitor C 2, capacitor C 154, resistance R 166, capacitor C 156, capacitor C 153 and an operational amplifier, one end of described resistance R 3 is an input, the end of other end connecting resistance R165 and an end of capacitor C 2, the end of the other end connecting resistance R166 of resistance R 165 and an end of capacitor C 154, the input negative terminal and the output of another termination operational amplifier of capacitor C 154, one end of another termination capacitor C 156 of resistance R 166 and the input anode of operational amplifier, another termination signal ground of capacitor C 2 and capacitor C 156, capacitor C 153 two ends connect power positive end and ground respectively.
The direct current signal of three rank low-pass filter circuits after to rectification carries out low-pass filtering, and the carrier signal of the 50kHz sine that receives becomes approximate square-wave signal after filtering.
(6) stagnate chain rate than reaching output circuit;
With reference to Fig. 7, described stagnant chain rate reaches output circuit and comprises resistance R 163, resistance R 162, resistance R 171, an operational amplifier, resistance R 5 ground, resistance R 29, diode D1, diode D2, diode D3 and a triode, one end of described resistance R 163 is an input, the input anode of another termination operational amplifier, one termination power anode of resistance R 162, the end of other end connecting resistance R171 and the input negative terminal of operational amplifier, the end of the output connecting resistance R4 of operational amplifier and an end of resistance R 5, the anode of another terminating diode D1 of resistance R 5, the negative electrode of diode D1 connects the anode of diode D2, the negative electrode of diode D2 connects the anode of diode D3, the end of the negative electrode connecting resistance R29 of diode D3 and the base stage of triode, the collector electrode of triode connects EURIDIS RXD signal, the other end of resistance 171, the other end of resistance R 4, the other end of resistance R 29 and the grounded emitter of triode.
The chain rate that stagnates reaches output circuit filtered approximate square-wave signal is stagnated chain rate, export square-wave signal preferably, here definite duty ratio that needs to guarantee output square wave high-low level of standard comparative level is near 1: 1, so R162 and R171 requirement service precision are 1% resistance.Because EURIDIS requires have carrier signal to be output as " 0 ", carrierfree is " 1 ", so use triode 8050 negates once.Diode D1, D2, D3 reduces to 0V with the low level that comparator is exported square wave.
2.EURIDIS transtation mission circuit (the TIC transtation mission circuit is identical with the EURIDIS transtation mission circuit):
(1) band pass filter;
With reference to Fig. 8, described band pass filter comprises resistance R 16, resistance R 17, resistance R 18, capacitor C 22, capacitor C 23, capacitor C 24 and an operational amplifier, the square-wave signal of one termination 50kHz of described resistance R 17, one end of the end of other end connecting resistance R18, an end of capacitor C 22 and capacitor C 23, the end of the other end connecting resistance R16 of capacitor C 22 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 23 of resistance R 161 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.
The square-wave signal of 50kHz generates behind band pass filter and is used for the 50kHz sinusoidal signal that carrier wave sends.Square-wave signal in the present embodiment needs the outside to provide, and also can be revised as inside modules and produce square-wave signal by 555 timers.
(2) signal sending circuit;
With reference to Fig. 9, described signal sending circuit comprises two level reverse circuit and analog switching circuits that structure is identical, and wherein two level reverse circuits are respectively applied for and connect EURIDIS TXD and TIC TXD.The described level reverse circuit that is used to connect EURIDIS TXD comprises resistance R 19, resistance R 20, resistance R 21 and a triode, one termination EURIDIS TXD signal of described resistance R 19, the base stage of other end connecting resistance R21 and triode, one termination power anode of resistance R 20, the collector electrode of another termination triode and the input of analog switching circuit, the other end of resistance R 21 and the grounded emitter of triode.
The HEF4066 chip that analog switch adopts PHILIPS Co. to produce switches the 50kHz signal.When wherein switch controlling signal was high level, output i.e. input (50kHz sinusoidal signal), when switching signal is low level, and output 0V.Use triode that digital sending signal is carried out the level upset, carry out the output of 50kHz signaling switch then, final output effect has carrier wave output for " 0 ", the output of " 1 " carrierfree.
(3) band sends the signal amplification transtation mission circuit of Enable Pin.
With reference to Figure 10, described band sends the signal amplification circuit and the signal coupling circuit of Enable Pin, wherein amplifying circuit adopts the TLC083 chip that TI company produces, comprise resistance R 10, resistance R 11, capacitor C 28 capacitor C 6 and resistance R 14, one end of described resistance R 10 is an input, the input negative terminal of the end of other end connecting resistance R11, an end of capacitor C 28 and operational amplifier, the other end of another termination capacitor C 28 of resistance R 11, the output of operational amplifier and the input of signal coupling circuit, the positive termination signal ground of the input of operational amplifier.
Carrier signal after analog switch switches after amplifying circuit (amplifier adopts the TLC083 of TI company) and coupling transformer send on the EURIDIS connecting line.Because EURIDIS is the half-duplex operation circuit, so when sending signal, the Enable Pin of amplifier enables; When received signal, amplifier does not enable, and output is a high-impedance state, receiving circuit is not exerted an influence.
Because the switching of analog switch, the carrier signal edge of output has switch noise, needs to adjust capacitor C 28 here and capacitance C6 drops to noise minimum.
This module can be finished the modulation and demodulation work of 50kHz carrier signal with after electric energy meter is connected, and realizes functions such as communication and automatic data logging by the EURIDIS bus.
Parameter request for EURIDIS and TIC carrier signal is as follows:
The parameter characteristic of carrier envelope is with reference to Fig. 1.
The carrier transmission signal parameter requires with reference to table 1.
Table 1
Simultaneously require as follows for digital signal that receives and receiving system itself:
1, the digital signal that receives will satisfy the high-low level duty ratio near 1: 1;
2, all can receive for the carrier signal of carrier amplitude at 1.5V-8.5V;
3, all can receive for the carrier signal of carrier frequency at 47.75K-52.5K;
4, receiver is that the persistent signal of 0.25V is insensitive for the peak value between the 1kHz-1MHz;
5, receiver is that the 20V pulse signal of 5uS is insensitive for width.
The concrete parameter actual measurement of the twisted-pair feeder carrier communication circuit part of the utility model Automatic meter reading system is as follows:
The Euridis modem trainup, transmission rate 9600bps sends carrier signal part of detecting data with reference to table 2.
Table 2
The positive negative level duration of Euridis modem trainup transmission rate 9600 received signal part of detecting, unit is uS, referring to table 3.
Table 3
The interface of the utility model hardware module is referring to table 4.
Table 4
The twisted-pair feeder carrier communication method that is used for Automatic meter reading system of the present utility model comprises the receiving demodulation flow process and sends the modulation flow process.
With reference to Figure 11, described receiving demodulation flow process is carried out according to the following steps:
Receive the interchange carrier signal on the EURIDIS bus, coupling transformer output is every straight back carrier signal;
Be amplified to amplitude saturated back output with described every straight carrier signal;
The interference signal of all frequencies in the described saturated carrier signal of filtering except that 50kHz;
Carrier signal after the described filtering interfering of 50kHz is carried out full-wave rectification, output direct current carrier signal;
Described direct current carrier signal is carried out low-pass filtering, become approximate square-wave signal;
Described approximate square-wave signal is stagnated chain rate, export square-wave signal preferably;
With reference to Figure 12, described transmission modulation flow process is carried out according to the following steps:
The square-wave signal of 50kHz is generated the 50kHz sinusoidal signal that is used for the carrier wave transmission;
Use analog switch that described 50kHz sinusoidal signal is switched, the direct current carrier signal after the output modulation;
Direct current carrier signal after the described modulation is converted to the interchange carrier signal by the operational amplification circuit of being with ena-bung function;
Described interchange carrier signal is outputed to the EURIDIS bus through the coupling coupling transformer.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection range of the present utility model.
Claims (14)
1. be used for the twisted-pair feeder carrier communication circuit of Automatic meter reading system, comprise receiving circuit and transtation mission circuit, it is characterized in that described receiving circuit comprises:
Signal coupling circuit receives the EURIDIS carrier signal, and output is every straight back carrier signal behind capacitor C 6 isolated DCs and coupling transformer T1;
Signal amplification circuit is amplified to amplitude saturated back output with what signal coupling circuit was exported every straight carrier signal;
The 50kHz bandwidth-limited circuit, the interference signal of all frequencies in the saturated carrier signal of filtered signal amplifying circuit output except that 50kHz;
Full-wave rectifying circuit carries out full-wave rectification with the carrier signal after the filtering interfering of 50kHz bandwidth-limited circuit output, output direct current carrier signal;
Three rank low-pass filter circuits carry out low-pass filtering to the direct current carrier signal of full-wave rectifying circuit output, become approximate square-wave signal;
The chain rate that stagnates reaches output circuit, and the approximate square-wave signal that three rank low-pass filter circuits are exported stagnates chain rate, exports square-wave signal preferably;
Described transtation mission circuit comprises:
Band pass filter generates the square-wave signal of 50kHz and is used for the 50kHz sinusoidal signal that carrier wave sends;
Signal sending circuit uses analog switch that the 50kHz sinusoidal signal of band pass filter output is switched, and realizes 0,1 transmission of carrier signal;
The signal that band sends Enable Pin amplifies transtation mission circuit, and the carrier signal of the output of signal sending circuit is sent on the EURIDIS connecting line through amplifying circuit and signal coupling circuit.
2. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 1 is characterized in that signal coupling circuit and the shared same circuit of the signal coupling circuit in the transtation mission circuit in the described receiving circuit.
3. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described signal coupling circuit comprises capacitor C 6, capacitor C 8, capacitor C 21, diode D154, diode D155, resistance R 14, resistance R 28 and coupling transformer T1, described capacitor C 8 one termination EURIDIS import 1 end, one end of the end of the other end connecting resistance R28 of capacitor C 8 and the former limit of coupling transformer T1 winding, another termination EURIDIS of resistance R 28 imports the other end of 2 ends and the former limit of coupling transformer T1 winding, the end of one termination capacitor C21 of coupling transformer T1 secondary winding and an end of resistance R 14, the other end and the signal ground of another termination capacitor C 21 of coupling transformer T1 secondary winding, one end of another termination capacitor C 6 of resistance R 14, the anode of another terminating diode D154 of capacitor C 6 and the negative electrode of diode D155, also be signal output part simultaneously, the negative electrode of diode D154 connects power positive end, the plus earth of diode D155.
4. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described signal amplification circuit comprises capacitor C 1, capacitor C 101, resistance R 1, resistance R 2 and an operational amplifier, one end of described capacitor C 1 is an input, the end of other end connecting resistance R1, the input negative terminal of one end of another termination capacitor C 101 of resistance R 1, an end of resistance R 2 and operational amplifier, the other end of the other end connecting resistance R2 of capacitor C 101 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.
5. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described 50kHz bandwidth-limited circuit comprises resistance R 156, resistance R 151, resistance R 157, capacitor C 150, capacitor C 151 and an operational amplifier, described resistance R 156 1 ends are input, the end of other end connecting resistance R157, one end of capacitor C 150 and an end of capacitor C 151, the end of the other end connecting resistance R151 of capacitor C 150 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 151 of resistance R 151 and the output of operational amplifier, also be signal output part simultaneously, the positive termination signal ground of the other end of resistance R 157 and the input of operational amplifier.
6. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described full-wave rectifying circuit comprises resistance R 152, resistance R 150, resistance R 158, diode D150, diode D151, first operational amplifier, resistance R 170, resistance R 160, resistance R 161, diode D152, diode D153, second operational amplifier, resistance R 154 and the 3rd operational amplifier, one end of described resistance R 152 is an input, the end of other end connecting resistance R150, the input negative terminal of the negative electrode of diode D150 and first operational amplifier, the anode of another terminating diode D151 of resistance R 150 and an end of resistance R 158, the anode of diode D150 connects the negative electrode of diode D151 and the output of first operational amplifier, the positive termination signal ground of the input of first operational amplifier; Resistance R 170 ends are input, the input negative terminal of the end of other end connecting resistance R160, diode D152 negative electrode and second operational amplifier, an another terminating diode D153 anode of resistance R 160 and an end of resistance R 161, the anode of diode D152 connects the negative electrode of diode D153 and the output of second operational amplifier, the positive termination signal ground of the input of second operational amplifier; The other end of the other end connecting resistance R161 of resistance R 158, an end of resistance R 154 and the input negative terminal of the 3rd operational amplifier, the output of another termination the 3rd operational amplifier of resistance R 154, the positive termination signal ground of the input of the 3rd operational amplifier.
7. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described three rank low-pass filter circuits comprise resistance R 3, resistance R 165, capacitor C 2, capacitor C 154, resistance R 166, capacitor C 156, capacitor C 153 and an operational amplifier, one end of described resistance R 3 is an input, the end of other end connecting resistance R165 and an end of capacitor C 2, the end of the other end connecting resistance R166 of resistance R 165 and an end of capacitor C 154, the input negative terminal and the output of another termination operational amplifier of capacitor C 154, one end of another termination capacitor C 156 of resistance R 166 and the input anode of operational amplifier, another termination signal ground of capacitor C 2 and capacitor C 156, capacitor C 153 two ends connect power positive end and ground respectively.
8. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described stagnant chain rate reaches output circuit and comprises resistance R 163, resistance R 162, resistance R 171, an operational amplifier, resistance R 5 ground, resistance R 29, diode D1, diode D2, diode D3 and a triode, one end of described resistance R 163 is an input, the input anode of another termination operational amplifier, one termination power anode of resistance R 162, the end of other end connecting resistance R171 and the input negative terminal of operational amplifier, the end of the output connecting resistance R4 of operational amplifier and an end of resistance R 5, the anode of another terminating diode D1 of resistance R 5, the negative electrode of diode D1 connects the anode of diode D2, the negative electrode of diode D2 connects the anode of diode D3, the end of the negative electrode connecting resistance R29 of diode D3 and the base stage of triode, the collector electrode of triode connects EURIDIS RXD signal, the other end of resistance 171, the other end of resistance R 4, the other end of resistance R 29 and the grounded emitter of triode.
9. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described band pass filter comprises resistance R 16, resistance R 17, resistance R 18, capacitor C 22, capacitor C 23, capacitor C 24 and an operational amplifier, the square-wave signal of one termination 50kHz of described resistance R 17, the end of other end connecting resistance R18, one end of capacitor C 22 and an end of capacitor C 23, the end of the other end connecting resistance R16 of capacitor C 22 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 23 of resistance R 161 and the output of operational amplifier, the positive termination signal ground of the input of operational amplifier.
10. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 9 is characterized in that the square-wave signal of described 50kHz input is an external signal, perhaps produces by 555 timers by telecommunication circuit of the present invention is inner.
11. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, it is characterized in that described signal sending circuit comprises two level reverse circuit and analog switching circuits that structure is identical, wherein two level reverse circuits are respectively applied for and connect EURIDIS TXD and TIC TXD.
12. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 11, it is characterized in that the described level reverse circuit that is used to connect EURIDIS TXD comprises resistance R 19, resistance R 20, resistance R 21 and a triode, one termination EURIDIS TXD signal of described resistance R 19, the base stage of other end connecting resistance R21 and triode, one termination power anode of resistance R 20, the collector electrode of another termination triode and the input of analog switching circuit, the other end of resistance R 21 and the grounded emitter of triode.
13. the twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system as claimed in claim 2, the signal amplification transtation mission circuit that it is characterized in that described band transmission Enable Pin comprises resistance R 10, resistance R 11, capacitor C 28 capacitor C 6, resistance R 14 and signal coupling circuit, one end of described resistance R 10 is an input, the end of other end connecting resistance R11, one end of capacitor C 28 and the input negative terminal of operational amplifier, the other end of another termination capacitor C 28 of resistance R 11, the output of operational amplifier and the input of signal coupling circuit, the positive termination signal ground of the input of operational amplifier.
14., it is characterized in that telecommunication circuit employing contact pin type interface of the present invention and ammeter are interconnected as any one described twisted-pair feeder carrier communication circuit that is used for Automatic meter reading system of claim 1-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206401915U CN201869196U (en) | 2010-12-01 | 2010-12-01 | Twisted-pair carrier communication circuit for automatic meter reading system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206401915U CN201869196U (en) | 2010-12-01 | 2010-12-01 | Twisted-pair carrier communication circuit for automatic meter reading system |
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| Publication Number | Publication Date |
|---|---|
| CN201869196U true CN201869196U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206401915U Expired - Lifetime CN201869196U (en) | 2010-12-01 | 2010-12-01 | Twisted-pair carrier communication circuit for automatic meter reading system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034345A (en) * | 2010-12-01 | 2011-04-27 | 浙江正泰仪器仪表有限责任公司 | Twisted pair carrier communication circuit for automatic meter reading system and method thereof |
| CN105548683A (en) * | 2015-12-11 | 2016-05-04 | 华立科技股份有限公司 | Three-phase electric meter |
| CN109302194A (en) * | 2018-11-29 | 2019-02-01 | 苏州东剑智能科技有限公司 | Mbus host receives circuit |
-
2010
- 2010-12-01 CN CN2010206401915U patent/CN201869196U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034345A (en) * | 2010-12-01 | 2011-04-27 | 浙江正泰仪器仪表有限责任公司 | Twisted pair carrier communication circuit for automatic meter reading system and method thereof |
| CN102034345B (en) * | 2010-12-01 | 2013-03-13 | 浙江正泰仪器仪表有限责任公司 | Twisted pair carrier communication circuit for automatic meter reading system and method thereof |
| CN105548683A (en) * | 2015-12-11 | 2016-05-04 | 华立科技股份有限公司 | Three-phase electric meter |
| CN109302194A (en) * | 2018-11-29 | 2019-02-01 | 苏州东剑智能科技有限公司 | Mbus host receives circuit |
| CN109302194B (en) * | 2018-11-29 | 2023-10-20 | 苏州东剑智能科技有限公司 | Mbus host receiving circuit |
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