CN103795442B - A kind of low-voltage power line carrier communication circuit based on OFDM mode modulation - Google Patents
A kind of low-voltage power line carrier communication circuit based on OFDM mode modulation Download PDFInfo
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- CN103795442B CN103795442B CN201310671615.2A CN201310671615A CN103795442B CN 103795442 B CN103795442 B CN 103795442B CN 201310671615 A CN201310671615 A CN 201310671615A CN 103795442 B CN103795442 B CN 103795442B
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Abstract
The invention discloses a kind of low-voltage power line carrier communication circuit based on OFDM mode modulation, this circuit includes that carrier Control circuit, zero cross detection circuit and signal coupling circuit, described carrier Control circuit are made up of SSC1650 chip and peripheral circuit；Described SSC1650 chip, this chip includes ARM core chip, PLL, OFDM base band, AFE, SPI；Described ARM core chip is connected by bus and OFDM base band, SPI；Described chip also includes SWD ICE, PMU Control, UART, WDT, GPIO, ADC；Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC are all connected by bus and ARM core chip；Compared with prior art, the low voltage power line carrier chip based on OFDM mode modulation of the present invention, flank speed reaches 150kbps, and utilizes 128bits AES encryption mechanism, ensured the safety of communication.
Description
Technical field
The present invention relates to a kind of power carrier communication circuit, be specifically related to a kind of based on OFDM pattern
The low-voltage power line carrier communication circuit of modulation.
Background technology
Along with the progressively foundation of country's intelligent grid, voltage power-line carrier communication technology is at electric energy
And various energy measurement field has obtained in depth applying, following electrical network necessarily electricity consumption, charging,
It is in communication in the automated system of integration, owing to carrier communication utilizes electric lines of force itself as transmission
Channel so that it has unrivaled advantage as means of communication, and power line carrier is led to
Believe that the range of application in fields such as household electrical appliance Automated condtrol and prospect will be quite varied, because of
This, power line carrier communication has huge economic benefit and significant social benefit.In but
There is many factors being unfavorable for that voltage power-line carrier communication technology develops in state's electrical network, such as:
Mains by harmonics serious interference, the pressure standard without electro instrument noise restriction, the branch of low-voltage network
Topological structure many, its complexity result in network impedance time-varying and non-linear, the most severe
Under power grid environment, it is achieved low-voltage power carrier mechanics of communication it is critical only that solution power line network
Impedance matching, power line signal decay, the problem such as noise and interference.Existing low-voltage power
Line carrier communication circuit, mostly have that circuit structure is complicated, cost high, operating voltage range is narrow,
The problems such as fidelity is poor, current drain is excessive.
Chinese Patent Application No. 201220740043.X, discloses a kind of low voltage power line carrier
Telecommunication circuit, this circuit includes carrier Control circuit, zero cross detection circuit and signal coupling circuit,
It is connected between described carrier Control circuit and signal coupling circuit and has signal amplification circuit filter
And wave reception filtering circuit, wherein, the mould that carrier Control circuit is exported by signal amplification circuit filter
Intend after signal is amplified, filters, transmitting in signal coupling circuit enters power line channel,
In power line channel, the signal of transmission is after signal coupling circuit converts, and is received filter circuit and disappears
Except being delivered to carrier Control circuit after High-frequency Interference；Described signal amplification circuit filter connects to be had
Current-limiting circuit, for controlling the output electric current of carrier Control circuit；Zero cross detection circuit is connected to
Between carrier Control circuit and electric lines of force, for power network power frequency component zero passage is detected.
This utility model circuit is simple, adds signal amplification circuit filter and current-limiting circuit, low in energy consumption,
Fidelity is high, and carrier communication performance is high；But its described carrier Control circuit uses
SSC1641 control chip, only supports BFSK communication mode, and can only realize the load of 270kHz
Wave communication, for there being other band requirement, and the place that other modulation systems require meets not
And needing additional EEPROM, the wave reception filtering circuit protection diode of the present invention is arranged on the 2nd
Level, protected effect is the best；And power circuit current drain is 3mA, loss ratio is higher.
Summary of the invention
For solving the problems referred to above, the object of the invention is in providing a kind of based on OFDM mode modulation
Low-voltage power line carrier communication circuit, uses OFDM modulating mode, and band efficiency is high；Solve
Intersymbol interference (ISI) that multipath transmisstion causes and fading problem.
For achieving the above object, the technical solution adopted in the present invention is: a kind of based on OFDM
The low-voltage power line carrier communication circuit of mode modulation, this circuit includes carrier Control circuit, mistake
Zero testing circuit and signal coupling circuit；State carrier Control circuit by SSC1650 chip and periphery
Circuit is constituted；Described SSC1650 chip, this chip includes ARM core chip, PLL, OFDM
Base band, AFE, SPI；Described ARM core chip is connected by bus and OFDM base band, SPI；
Described chip also includes SWD ICE, PMU Control, UART, WDT, GPIO, ADC；
Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC all pass through bus
Connect with ARM core chip；It is connected between described carrier Control circuit and signal coupling circuit
Signal amplification circuit filter and wave reception filtering circuit, described signal amplification circuit filter is had to connect
Current limit circuit, zero cross detection circuit is connected between carrier Control circuit and electric lines of force, described
Telecommunication circuit also includes the power pack powered to telecommunication circuit.
Further, the resolution of described ADC is 10.
Further, described OFDM base band and AFE connect.
Further, described carrier Control circuit connects interface circuit and display lamp.
Further, described wave reception filtering circuit includes two stage filter circuit, wherein, the first order
Filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit；The
Secondary filter circuit output end is parallel with clamp circuit.
Yet further, described clamp circuit is to be inverted parallel connection by diode D3 and diode D4
The parallel circuit structure of composition.
Further, described signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof,
It is provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit,
Current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all with power amplification circuit even
Connect；It is additionally provided with intermediate reference voltage output circuit in described ESPA16 chip.
Further, described power pack is 3.3V power supply, by DC/DC module composition.
Beneficial effect:
Compared with prior art, low-voltage power based on OFDM mode modulation of the present utility model
Line carrier chip, flank speed reaches 150kbps, and utilizes 128bits AES encryption mechanism,
Ensure the safety of communication.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the present invention；
Fig. 2 is the SSC1650 circuit structure block diagram of the present invention；
Fig. 3 is the current-limiting circuit circuit theory diagrams of the present invention；
Fig. 4 is the ESPA16 chip periphery circuit theory diagrams of the present invention；
Fig. 5 is the ESPA16 chip structure figure of the present invention；
Fig. 6 is coupling circuit and the circuit theory diagrams of wave reception filtering circuit of the present invention；
Fig. 7 is the circuit theory diagrams of the zero cross detection circuit of the present invention；
Fig. 8 is the circuit block diagram of the power pack of the present invention.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings:
As depicted in figs. 1 and 2, the low voltage power line carrier based on OFDM mode modulation of the present invention
Telecommunication circuit, this circuit includes carrier Control circuit, zero cross detection circuit and signal coupling circuit；
State carrier Control circuit to be made up of SSC1650 chip and peripheral circuit；Described SSC1650 chip,
This chip includes ARM core chip, PLL, OFDM base band, AFE, SPI；Described ARM kernel
Chip is connected by bus and OFDM base band, SPI；Described chip also includes SWD ICE, PMU
Control, UART, WDT, GPIO, ADC；Described SWD ICE, PMU Control,
UART, WDT, GPIO, ADC are all connected by bus and ARM core chip；Described
It is connected between carrier Control circuit and signal coupling circuit and has signal amplification circuit filter and reception
Filter circuit, described signal amplification circuit filter connects current limit circuit, zero cross detection circuit
Being connected between carrier Control circuit and electric lines of force, described telecommunication circuit also includes to telecommunication circuit
The power pack of power supply.
As shown in Fig. 3, Fig. 6, Fig. 7 and Fig. 8, described current-limiting circuit, signal amplification circuit filter,
Signal coupling circuit, wave reception filtering circuit and zero cross detection circuit are prior art, at this no longer
Repeat.
As shown in Figure 8, described wave reception filtering circuit includes two stage filter circuit, wherein, first
Level filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit；
Second level filter circuit outfan is parallel with clamp circuit；Described clamp circuit is by diode D3
It is inverted the parallel circuit structure composed in parallel with diode D4.
As shown in Figure 4 and Figure 5, described signal amplification circuit filter is by ESPA16 chip and periphery thereof
Circuit is constituted, and is provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and owes
Voltage protection circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all and power
Amplifying circuit connects；Intermediate reference voltage output electricity it is additionally provided with in described ESPA16 chip
Road.
As shown in Figure 8, described power pack is 3.3V power supply, by DC/DC module composition.
As it is shown in figure 9, this chip uses ofdm communication mode, i.e. orthogonal frequency division multiplexi,
It it is the one of MCM (Multi-CarrierModulation) multi-carrier modulation；Its main thought
It is: break a channel into some orthogonal sub-channels that high-speed data signal is converted into parallel low speed
Sub data flow, modulation is to being transmitted on each of the sub-channels；Orthogonal signalling can be by connecing
Receiving end uses correlation technique to come separately, so can reduce interfering between subchannel
ICI；Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and therefore every height is believed
Flatness of can regarding as on road declines, such that it is able to eliminate intersymbol interference；And due to often
The bandwidth of sub-channels is only the sub-fraction of former channel width, and channel equalization becomes relatively to hold
Easily.
Embodiment described above is only to be described the preferred embodiment of the present invention, and
Non-the spirit and scope of the present invention are defined.In the premise without departing from design concept of the present invention
Under, various modification that technical scheme is made by this area ordinary person and improvement, all
Protection scope of the present invention should be dropped into, the technology contents that the present invention is claimed, the most all
Record in detail in the claims.
Claims (8)
1. a low-voltage power line carrier communication circuit based on OFDM mode modulation, this circuit
Including carrier Control circuit, zero cross detection circuit and signal coupling circuit, it is characterised in that: institute
State carrier Control circuit to be made up of SSC1650 chip and peripheral circuit；Described SSC1650 chip,
This chip includes ARM core chip, PLL, OFDM base band, AFE, SPI；Described ARM kernel
Chip is connected by bus and OFDM base band, SPI；Described chip also includes SWD ICE, PMU
Control, UART, WDT, GPIO, ADC；Described SWD ICE, PMU Control,
UART, WDT, GPIO, ADC are all connected by bus and ARM core chip；Described
It is connected between carrier Control circuit and signal coupling circuit and has signal amplification circuit filter and reception
Filter circuit, described signal amplification circuit filter connects current limit circuit, zero cross detection circuit
Being connected between carrier Control circuit and electric lines of force, described telecommunication circuit also includes to telecommunication circuit
The power pack of power supply.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: the resolution of described ADC is 10.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: described OFDM base band and AFE connect.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: described carrier Control circuit connects interface circuit and display lamp.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: wave reception filtering circuit includes three-level filtering circuit, wherein,
First-level filtering wave circuit connects signal coupling circuit, and third level filter circuit connects carrier Control circuit；
Third level filter circuit outfan is parallel with clamp circuit.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 5
Telecommunication circuit, it is characterised in that: clamp circuit is to be inverted also by diode D3 and diode D4
The parallel circuit structure that joint group becomes.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: signal amplification circuit filter is by ESPA16 chip and peripheral electricity thereof
Road is constituted, and is provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage
Protection circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all put with power
Big circuit connects；It is additionally provided with intermediate reference voltage output circuit in described ESPA16 chip.
Low voltage power line carrier based on OFDM mode modulation the most according to claim 1
Telecommunication circuit, it is characterised in that: described power pack is 3.3V power supply, by DC/DC
Module composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671615.2A CN103795442B (en) | 2013-12-12 | 2013-12-12 | A kind of low-voltage power line carrier communication circuit based on OFDM mode modulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671615.2A CN103795442B (en) | 2013-12-12 | 2013-12-12 | A kind of low-voltage power line carrier communication circuit based on OFDM mode modulation |
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| Publication Number | Publication Date |
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| CN103795442A CN103795442A (en) | 2014-05-14 |
| CN103795442B true CN103795442B (en) | 2016-09-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985244A (en) * | 2014-06-03 | 2014-08-13 | 青岛东软载波科技股份有限公司 | Communication method for mobile terminal and power line carrier equipment |
| CN105389968A (en) * | 2015-12-21 | 2016-03-09 | 南京新联电子股份有限公司 | Electric line broadband carrier communication module for low voltage centralization meter reading terminal |
| CN106788603A (en) * | 2017-01-03 | 2017-05-31 | 青岛东软载波科技股份有限公司 | A kind of middle pressure broadband power line carrier communication circuit of OFDM mode modulations |
| CN109920229A (en) * | 2019-03-01 | 2019-06-21 | 青岛东软载波科技股份有限公司 | Electricity meter-reading communication module based on single carrier multicarrier and wireless communication fusion |
| CN110889961A (en) * | 2019-10-30 | 2020-03-17 | 江苏芯云电子科技有限公司 | System and method for reducing PLC power consumption and interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202231715U (en) * | 2011-08-25 | 2012-05-23 | 东华大学 | OFDM-based power line carrier communication system |
| CN202495963U (en) * | 2012-03-31 | 2012-10-17 | 北京华强智连微电子有限责任公司 | OFDM carrier communication module |
| CN103036593B (en) * | 2012-12-30 | 2015-01-07 | 青岛东软载波科技股份有限公司 | Low-voltage power line carrier communication circuit |
| CN103281103A (en) * | 2013-05-15 | 2013-09-04 | 北京华强智连微电子有限责任公司 | OFDM (orthogonal frequency division multiplexing) power line carrier communication SOC (system on chip) |
| CN203327000U (en) * | 2013-06-21 | 2013-12-04 | 利尔达科技集团股份有限公司 | OFDM technology-based power line carrier wave apparatus |
| CN203761387U (en) * | 2013-12-12 | 2014-08-06 | 青岛东软载波科技股份有限公司 | Low-voltage power line carrier communication circuit based on OFDM mode modulation |
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