CN102223160B - Power line carrier communication transmitting circuit - Google Patents
Power line carrier communication transmitting circuit Download PDFInfo
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- CN102223160B CN102223160B CN 201110166801 CN201110166801A CN102223160B CN 102223160 B CN102223160 B CN 102223160B CN 201110166801 CN201110166801 CN 201110166801 CN 201110166801 A CN201110166801 A CN 201110166801A CN 102223160 B CN102223160 B CN 102223160B
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Abstract
The invention provides a power line carrier communication transmitting circuit comprising a filter circuit, a power amplification circuit and a coupling circuit; the modulation signal is filtered by the filter circuit and subsequently enters the power amplification circuit so as to be amplified; the amplified modulation signal enters the power line channel by the coupling circuit and is transmitted. The power line carrier communication transmitting circuit provides signal filtering of communication frequency band and stops the interference of other frequency bands; and the power amplifier has low output resistance and high input resistance so as to be effectively used for power line carrier communication.
Description
Affiliated technical field
The present invention relates to the communications field, particularly power line carrier communication field relates to a kind of transtation mission circuit of power line carrier communication.
Background technology
Power line carrier communication is a kind of with the communication mode of high-frequency carrier signal by high-voltage power line transmission information.This communication system is to be the communication of power system of the transmission medium of carrier signal with the transmission line.Because transmission line possesses very firm supporting construction, and sets up the conductor (three-phase good conductor and one or two overhead ground wire are generally arranged) more than 3, so when power transmission line is carried power current, the transmission carrier signal of using, not only economy but also very reliable.This comprehensive utilization becomes the preferential peculiar means of communication that adopts of all power departments in the world already.
Power line carrier communication with the difference of general overhead wire carrier communication is: the available spectrum scope is from 8kHz～500kHz in same electrical network, can only open limited passage, need take standard bands 4kHz as each half-duplex channel, then this frequency band can not be reused, otherwise will produce serious cross-talk.So general power line carrier equipment all adopts the monolateral belt body system of single channel, every passage dual seizure 2 * 4kHz bandwidth, 61 circuit altogether.Open more multicircuit if desired, then must take to install additional the quarantine measures that the electrical network high frequency is cut apart filter.
The coupled modes of carrier current and power transmission line are divided into and are coupled mutually and coupling two classes mutually.The sending allowance that is coupled mutually is less, but coupling that investment is set is bigger.Mutually ground coupled transfer attenuation is bigger, but that coupling arranges investment is less.On the power transmission line of the overhead ground wire that adopts insulation against ground (discharging gap by insulator during thunderbolt discharges over the ground), also carrier current can be coupled on the overhead ground wire, be called ground wire carrier.If the phase conductor of high voltage transmission line is bundle conductor, then is coupling in the carrier wave of opening between two sub-conductors and is called and divides carrier wave (this moment between bundle conductor must insulated from each other) mutually.
The Power Limitation of posting a letter is because carrier current can be to the space radiation electromagnetic wave when power line transmits, disturb broadcasting and navigation services such as flight, navigation in this frequency range, so national governments are all limited the power of posting a letter, common 10 watts of outputs can be transmitted the hundreds of kilometer, and some is greater than 1000 kilometers circuit, also allows power output is brought up to 100 watts.
Most of power line carriers of multiplexing modern times of frequency band all adopt standard 4kHz frequency spectrum, and wherein effective transmission band is 300～3400Hz.In order to save the use effective band, adopt frequency multiplexing technique, 300～2000Hz is transmitted speech for one section, the last audio section of 2400～3400Hz transmits remote action data or high-frequency protecting signal.Also some carrier terminal equipment is furnished with special-purpose control interface, utilizes the instantaneous switching of same carrier channel to transmit high-frequency protecting signal, is referred to as the Multiplexing Carrier machine.
The high frequency carrier electric current that is coupled on the power transmission line is calculated in the transmission of signal, along with the difference of arrangements of conductors and coordinated transposition, and the difference of coupled modes, its transmission rule is very complicated.When the design carrier channel, the calculating of transmission performance in the past more uses empirical equation, accurate inadequately.After the seventies, according to the mode transfer theory carrier current mode transfer computational mathematics model of having derived, the general-purpose computations program of working out provides on the engineering enough accurate computational tools, for design, manufacturing and the use of operation department.The practicability software that the eighties, China developed has reached international most advanced level.
The basic structure of power-line carrier channel is such: the receipts transmitting end of carrier terminal equipment connects coupling capacitor with high frequency cable through filter joint, carrier current is sent on the power transmission line, filter flows to the substation busbars side in order to prevent carrier current, reduces the shunting loss.Owing to power line is not to be the communication objective circuit that sets up specially, mainly lay for the electric power transfer purpose, the interference of various power consumption equipments is very serious on the circuit, load variations is big, so the impedance variation scope is very big, present transtation mission circuit can not stop the interference of other frequency ranges effectively, does not also have low output impedance, high input impedance, can not effectively be used for power line carrier communication.
Summary of the invention
Goal of the invention of the present invention provides the transtation mission circuit that is suitable for low-voltage powerline carrier communication, can stop the interference of other frequency ranges effectively, has the transtation mission circuit of the power line carrier communication of low output impedance, high input impedance and low-power consumption.
The present invention in order to realize the technical scheme that its goal of the invention adopts is: a kind of power line carrier communication transtation mission circuit, comprise filter circuit, power amplifier and coupling circuit, modulation signal by described filter circuit filtering after, entering described power amplifier amplifies, the described coupling circuit of process enters in the power line channel and transmits, it is characterized in that: described coupling circuit comprises coupling transformer and isolation capacitance, the amplifying signal output of the described power amplifier of out-phase termination of the primary coil of described coupling transformer, the in-phase end ground connection of the primary coil of described coupling transformer, the out-phase end of the secondary coil of described coupling transformer connects a phase line of power line by described isolation capacitance, and the in-phase end of the secondary coil of described coupling transformer directly connects another root phase line.
Further; in above-mentioned a kind of power line carrier communication transtation mission circuit: at the primary coil two ends of described coupling transformer and be connected to the second protection Transient Voltage Suppressor, at the secondary coil two ends of described coupling transformer and be connected to the first protection Transient Voltage Suppressor.
Further, in above-mentioned a kind of power line carrier communication transtation mission circuit: described filter circuit is three rank band pass filters, be included in side signal transmission to the first rank filter of being formed by filter inductance L4 and filter capacitor C11 ground connection in parallel, be connected on the second rank filter of being formed by filter capacitor C8 and filter capacitor L2 polyphone behind the described first rank filter, be arranged on behind the described second rank filter by the 3rd rank filter of forming after filter inductance L3 and the filter capacitor C10 parallel connection ground connection.
Further, in above-mentioned a kind of power line carrier communication transtation mission circuit: in the described filter, side signal transmission to, be connected with build-out resistor R17 before the described first rank filter.
Further, in above-mentioned a kind of power line carrier communication transtation mission circuit: described power amplifier will send amplification coupling circuit, voltage amplifier circuit, complementary push-pull amplifying circuit and constant-current source, the power circuit that signal is coupled to power amplifier;
Described amplification coupling circuit comprises coupling capacitance C4 and direct-current coupling triode Q5, the base stage of described direct-current coupling triode Q5 connects input signal by described coupling capacitance C4, the base stage that the base stage of described direct-current coupling triode Q5 is provided with resistance R 5 and R13 polyphone composition is worth resistance partially, resistance R 5 and R13 are connected between described power circuit output end and the ground, and the base stage of described direct-current coupling triode Q5 is connected between resistance R 5 and the R13; Resistance R 4 is set between the collector electrode of direct-current coupling triode Q5 and described power circuit output end to be formed the current collection levels and is worth resistance partially; Being provided with resistance R 12 between the emitter of direct-current coupling triode Q5 and ground forms emitters and is worth resistance partially;
Described voltage amplifier circuit comprises voltage amplification triode Q3, the base stage of described voltage amplification triode Q3 connects the collector electrode of described direct-current coupling triode Q5, the emitter of described voltage amplification triode Q3 connects described power circuit output end, is provided with the DC channel that diode D1, resistance R 10, triode Q7 and resistance R 14 are formed between the collector electrode of described voltage amplification triode Q3 and ground;
Described complementary push-pull amplifying circuit comprises triode Q4 and triode Q6, described triode Q4 is that NPN type triode, described triode Q6 are the positive-negative-positive triode, the emitter of described triode Q4 and triode Q6 links to each other with R9 by serial resistance R6, the collector electrode of triode Q4 connects+the 5V power supply, the grounded collector of triode Q6, the base stage of triode Q4 connects the collector electrode of described voltage amplification triode Q3, be connected diode D1 and resistance R 10 between the base stage of the base stage of triode Q6 and triode Q4, the P utmost point of diode D1 connects the base stage of triode Q4;
Described constant-current source comprises diode D2, resistance R 11, triode Q7 and resistance R 14, one end of described resistance R 11 links to each other with described power circuit output end, the described triode Q7 of another termination base stage, described diode D2 is connected between described triode Q7 base stage and the ground, and resistance R 14 is connected between triode Q7 emitter and the ground.
The present invention has played key effect in the power line carrier communication circuit of reality, effectively improved the efficient of receiving sensitivity and transtation mission circuit and reduced power consumption.
Describe the present invention below in conjunction with accompanying drawing.
Description of drawings
Accompanying drawing 1 is system block diagram of the present invention.
Accompanying drawing 2 is coupling circuit schematic diagrams of the present invention.
Accompanying drawing 3 is filter circuit schematic diagrams of the present invention.
Accompanying drawing 4 is power amplifier schematic diagrams of the present invention.
Embodiment
Be the filter circuit of present embodiment as shown in Figure 3, carrier signal is carried out low-pass filtering by this filter circuit, the filter circuit of present embodiment is three rank band pass filters, carrier signal is successively by three grades of filters, three rank band pass filters are included in side signal transmission to the first rank filter of being made up of filter inductance L4 and filter capacitor C11 ground connection in parallel, be connected on the second rank filter of being formed by filter capacitor C8 and filter capacitor L2 polyphone behind the first rank filter, be arranged on behind the second rank filter by the 3rd rank filter of forming after filter inductance L3 and the filter capacitor C10 parallel connection ground connection.Before filter, also be provided with build-out resistor R17 and capacitor C 19.Be the filter circuit behind the PLM-1 chip in the present embodiment, because the output impedance of prime modulation circuit is smaller, be less than 50 Ω, therefore use the resistance of 100 Ω to do impedance matching.
Be illustrated in figure 4 as the power amplifier of present embodiment, signal after this circuit will be handled through filtering amplifies, and as shown: the power amplifier in the present embodiment will send amplification coupling circuit, voltage amplifier circuit, complementary push-pull amplifying circuit and constant-current source, the power circuit that signal is coupled to power amplifier;
In the present embodiment, coupling capacitance C4 is the coupling capacitance of direct-current coupling triode Q5, direct-current coupling triode Q5 provides the direct-current coupling signal for voltage amplification triode Q3, amplification coupling circuit in the present embodiment comprises coupling capacitance C4 and direct-current coupling triode Q5, the base stage of direct-current coupling triode Q5 connects input signal by coupling capacitance C4, the base stage that the base stage of direct-current coupling triode Q5 is provided with resistance R 5 and R13 polyphone composition is worth resistance partially, resistance R 5 and R13 are connected between power circuit output end and the ground, and the base stage of described direct-current coupling triode Q5 is connected between resistance R 5 and the R13; Resistance R 4 is set between the collector electrode of direct-current coupling triode Q5 and power circuit output end to be formed the current collection levels and is worth resistance partially; Being provided with resistance R 12 between the emitter of direct-current coupling triode Q5 and ground forms emitters and is worth resistance partially;
Q4 and Q6 form the complementary push-pull amplifying circuit, there is not voltage amplification, have only electric current to amplify, comprise triode Q4 and triode Q6, described triode Q4 is NPN type triode, described triode Q6 is the positive-negative-positive triode, the emitter of described triode Q4 and triode Q6 links to each other with R9 by serial resistance R6, the collector electrode of triode Q4 connects+the 5V power supply, the grounded collector of triode Q6, the base stage of triode Q4 connects the collector electrode of described voltage amplification triode Q3, be connected diode D1 and resistance R 10 between the base stage of the base stage of triode Q6 and triode Q4, the P utmost point of diode D1 connects the base stage of triode Q4;
Voltage amplifier circuit comprises voltage amplification triode Q3, Q3 is used as voltage amplification here, through after the low-pass filtering, again through direct-current coupling triode Q5 coupling, in the present embodiment, the signal that voltage amplification triode Q3 will need to send carries out voltage amplification, the base stage of voltage amplification triode Q3 connects the collector electrode of direct-current coupling triode Q5, obtain signal to be sent from the collector electrode of direct-current coupling triode Q5, the emitter of voltage amplification triode Q3 connects described power circuit output end, is provided with diode D1 between the collector electrode of described voltage amplification triode Q3 and ground, resistance R 10, the through ground of DC channel that triode Q7 and resistance R 14 are formed.Diode D1, resistance R 10 and resistance R 14 make Q4 and Q6 be in critical conduction mode for Q4, Q6 provide base bias, eliminate the output intermodulation distortion.Here the direction of D1 is extremely important, it is correct that the D1 installation direction must keep, otherwise be easy to cause Q4 and Q6 to burn out, reason be the D1 direction anti-after, the collector current of Q3 all injects the base stage of Q4, cause Q4 conducting and electric current very big, and the base stage of Q6 is received the current collection collection of Q7 and Q7 is in the conducting state of constant-current source, so Q6 also has very big conducting electric current, and two pipes have enough conducting electric currents, cause the collector current of Q4 and Q6 excessive, finally burn out.In addition, R10 is unsuitable excessive, otherwise causes the base bias voltage of Q4 and Q6 excessive, and R6 and R9 play metering function, and the voltage method by detecting resistance two ends Q4 as can be seen provides with Q6 and exchanges the negative half period operating current.
Constant-current source comprises diode D2, resistance R 11, triode Q7 and resistance R 14, one end of resistance R 11 links to each other with power circuit output end, the described triode Q7 of another termination base stage, diode D2 is contacted by two general-purpose diodes, be connected between triode Q7 base stage and the ground, making the bias voltage between Q7 base stage and the ground is the voltage of two PN junctions, is 0.3V+0.3V=0.6V probably in the present embodiment.Resistance R 14 is connected between triode Q7 emitter and the ground.
This place, Q4 and Q6 form the complementary push-pull amplifying circuit, do not have voltage amplification, have only electric current to amplify.D2, R11, Q7 and R14 form constant-current source, and Q3 provides the constant current collector current for the voltage amplification triode, and R8, R12, C6 form the feedback circuit of whole power amplifier, directly influence the multiplication factor of power amplifier by changing R8, R12.
In the present embodiment, power circuit also can provide power supply for the other parts circuit.
Coupling circuit as shown in Figure 2, coupling circuit comprises that coupling transformer T1 and isolation capacitance C7 and resistance R 15, R16 and variable resistor RV1 form, the amplifying signal output of the power amplifier of the out-phase termination of the primary coil of coupling transformer T1, in-phase end ground connection with the primary coil by filtering and the described coupling transformer T1 of amplifying signal, the out-phase end of the secondary coil of described coupling transformer T1 connects a phase line of power line by described isolation capacitance C7, and the in-phase end of the secondary coil of described coupling transformer T1 directly connects another root phase line.In the present embodiment, at the primary coil two ends of coupling transformer T1 and be connected to the second protection Transient Voltage Suppressor ZD2, at the secondary coil two ends of described coupling transformer T1 and be connected to the first protection Transient Voltage Suppressor ZD1.
Claims (4)
1. power line carrier communication transtation mission circuit, comprise filter circuit, power amplifier and coupling circuit, modulation signal by described filter circuit filtering after, entering described power amplifier amplifies, the described coupling circuit of process enters in the power line channel and transmits, it is characterized in that: described coupling circuit comprises coupling transformer (T1) and isolation capacitance (C7), the amplifying signal output of the described power amplifier of out-phase termination of the primary coil of described coupling transformer (T1), the in-phase end ground connection of the primary coil of described coupling transformer (T1), the out-phase end of the secondary coil of described coupling transformer (T1) connects a phase line of power line by described isolation capacitance (C7), and the in-phase end of the secondary coil of described coupling transformer (T1) directly connects another root phase line;
Described power amplifier comprises and will send amplification coupling circuit, voltage amplifier circuit, complementary push-pull amplifying circuit and constant-current source, the power circuit that signal is coupled to power amplifier;
Described amplification coupling circuit comprises coupling capacitance C4 and direct-current coupling triode Q5, the base stage of described direct-current coupling triode Q5 connects input signal by described coupling capacitance C4, the base stage that the base stage of described direct-current coupling triode Q5 is provided with resistance R 5 and R13 polyphone composition is worth resistance partially, resistance R 5 and R13 are connected between described power circuit output end and the ground, and the base stage of described direct-current coupling triode Q5 is connected between resistance R 5 and the R13; Resistance R 4 is set between the collector electrode of direct-current coupling triode Q5 and described power circuit output end to be formed the current collection levels and is worth resistance partially; Being provided with resistance R 12 between the emitter of direct-current coupling triode Q5 and ground forms emitters and is worth resistance partially;
Described voltage amplifier circuit comprises voltage amplification triode Q3, the base stage of described voltage amplification triode Q3 connects the collector electrode of described direct-current coupling triode Q5, the emitter of described voltage amplification triode Q3 connects described power circuit output end, is provided with the DC channel that diode D1, resistance R 10, triode Q7 and resistance R 14 are formed between the collector electrode of described voltage amplification triode Q3 and ground;
Described complementary push-pull amplifying circuit comprises triode Q4 and triode Q6, described triode Q4 is that NPN type triode, described triode Q6 are the positive-negative-positive triode, the emitter of described triode Q4 and triode Q6 links to each other with R9 by serial resistance R6, the collector electrode of triode Q4 connects+the 5V power supply, the grounded collector of triode Q6, the base stage of triode Q4 connects the collector electrode of described voltage amplification triode Q3, be connected diode D1 and resistance R 10 between the base stage of the base stage of triode Q6 and triode Q4, the P utmost point of diode D1 connects the base stage of triode Q4;
Described constant-current source comprises diode D2, resistance R 11, triode Q7 and resistance R 14, one end of described resistance R 11 links to each other with described power circuit output end, the described triode Q7 of another termination base stage, described diode D2 is connected between described triode Q7 base stage and the ground, and resistance R 14 is connected between triode Q7 emitter and the ground.
2. a kind of power line carrier communication transtation mission circuit according to claim 1; it is characterized in that: at the primary coil two ends of described coupling transformer (T1) and be connected to the second protection Transient Voltage Suppressor (ZD2), at the secondary coil two ends of described coupling transformer (T1) and be connected to the first protection Transient Voltage Suppressor (ZD1).
3. a kind of power line carrier communication transtation mission circuit according to claim 1, it is characterized in that: described filter circuit is three rank band pass filters, be included in side signal transmission to the first rank filter of being formed by filter inductance L4 and filter capacitor C11 ground connection in parallel, be connected on the second rank filter of being formed by filter capacitor C8 and filter capacitor L2 polyphone behind the described first rank filter, be arranged on behind the described second rank filter by the 3rd rank filter of forming after filter inductance L3 and the filter capacitor C10 parallel connection ground connection.
4. a kind of power line carrier communication transtation mission circuit according to claim 3 is characterized in that: in the described filter, side signal transmission to, be connected with build-out resistor R17 before the described first rank filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110166801 CN102223160B (en) | 2011-06-21 | 2011-06-21 | Power line carrier communication transmitting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110166801 CN102223160B (en) | 2011-06-21 | 2011-06-21 | Power line carrier communication transmitting circuit |
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| CN102223160A CN102223160A (en) | 2011-10-19 |
| CN102223160B true CN102223160B (en) | 2013-08-14 |
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| CN 201110166801 Ceased CN102223160B (en) | 2011-06-21 | 2011-06-21 | Power line carrier communication transmitting circuit |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141267A (en) * | 2015-08-05 | 2015-12-09 | 成都君禾天成科技有限公司 | Power amplifying circuit with adoption of power line carrier communication |
| CN108259012B (en) * | 2016-12-29 | 2021-09-14 | 钜泉光电科技(上海)股份有限公司 | Power amplifier of broadband power line |
| CN107733469B (en) * | 2017-11-17 | 2023-10-20 | 联桥科技有限公司 | Anti-interference circuit for power line broadband carrier communication |
| FR3083939A1 (en) * | 2018-07-13 | 2020-01-17 | Zodiac Aerotechnics | DATA TRANSMISSION SYSTEM |
| CN109861723B (en) * | 2019-01-25 | 2021-12-28 | 安徽南瑞继远电网技术有限公司 | Wireless WiFi equipment for power line carrier communication |
| CN110830084B (en) * | 2019-12-24 | 2021-06-22 | 上海虑信电力科技有限公司 | Phase coupling driving circuit of power line carrier communication system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003134003A (en) * | 2001-10-30 | 2003-05-09 | Matsushita Electric Works Ltd | Power line coupling circuit and power line carrier communication adapter |
| JP4341894B2 (en) * | 2003-03-14 | 2009-10-14 | ネッツエスアイ東洋株式会社 | Power line communication system |
| CN2779733Y (en) * | 2005-04-08 | 2006-05-10 | 中国电子科技集团公司第五十四研究所 | Electronic phase scanning track receiver |
| CN2852538Y (en) * | 2005-11-22 | 2006-12-27 | 国晓娜 | Power line multi-carrier transmitter |
| CN101414852B (en) * | 2007-10-19 | 2012-08-22 | 弥亚微电子（上海）有限公司 | Output coupling and filter circuit for power line carrier communication |
| CN201340652Y (en) * | 2009-01-22 | 2009-11-04 | 南京信息职业技术学院 | Device for metering low-voltage power line carrier |
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