CN103795442A - OFDM mode modulation-based low-voltage power line carrier communication circuit - Google Patents
OFDM mode modulation-based low-voltage power line carrier communication circuit Download PDFInfo
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- CN103795442A CN103795442A CN201310671615.2A CN201310671615A CN103795442A CN 103795442 A CN103795442 A CN 103795442A CN 201310671615 A CN201310671615 A CN 201310671615A CN 103795442 A CN103795442 A CN 103795442A
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Abstract
The invention discloses an OFDM mode modulation-based low-voltage power line carrier communication circuit. The circuit includes a carrier control circuit, a zero crossing detection circuit and a signal coupling circuit; the carrier control circuit is composed of an SSC1650 chip and a peripheral circuit; the SSC1650 chip comprises an ARM inner core chip, a PLL, an OFDM baseband, an AFE and SPI, wherein the ARM inner core chip is connected with the OFDM baseband and the SPI through a bus; the chip further comprises a PMU control, a UART, a WDT, a GPIO and an ADC module; and an SWD ICE, the PMU Control, the UART, the WDT, the GPIO and the ADC module are respectively connected with the ARM inner core chip through the bus. Compared with the prior art, the maximum rate of the OFDM mode modulation-based low-voltage power line carrier chip can achieve 150kbps; and with a 128-bit AES encryption mechanism adopted, communication security can be ensured.
Description
Technical field
The present invention relates to a kind of power carrier communication circuit, be specifically related to a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern.
Background technology
Along with the progressively foundation of national intelligent grid, voltage power-line carrier communication technology has obtained in depth application at electric energy and various energy measurements field, following electrical network must be electricity consumption, charging, be in communication in integrated automated system, because carrier communication utilizes power line itself as transmission channel, make it there is unrivaled advantage as means of communication, and power line carrier communication will be very extensive in range of application and the prospect in the fields such as electric appliance automatic control, therefore, power line carrier communication has huge economic benefit and significant social benefit.But there is many factors that is unfavorable for voltage power-line carrier communication technology development in China Power Grids, for example: branch's topological structures many, that it is complicated of mains by harmonics serious interference, the pressure standard limiting without electro instrument noise, low-voltage network become while having caused network impedance and be non-linear, under so severe power grid environment, the key that realizes low-voltage power carrier mechanics of communication is to solve the problems such as impedance matching, power line signal decay, noise and the interference of power line network., mostly there is the problems such as circuit structure complexity, cost is high, operating voltage range is narrow, fidelity is poor, current drain is excessive in existing low-voltage powerline carrier communication circuit.
Chinese Patent Application No. 201220740043.X, a kind of low-voltage powerline carrier communication circuit is disclosed, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, wherein, signal filtering amplifying circuit amplifies the analog signal of carrier Control circuit output, after filtering, enter in power line channel and transmit through signal coupling circuit, the signal transmitting in power line channel is after signal coupling circuit conversion, after eliminating High-frequency Interference, wave reception filtering circuit is delivered to carrier Control circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, for controlling the output current of carrier Control circuit, zero cross detection circuit is connected between carrier Control circuit and power line, for power network power frequency component zero passage is detected.Circuit of the present invention is simple, has increased signal amplification circuit filter and current-limiting circuit, low in energy consumption, fidelity is high, and carrier communication performance is high; But what the carrier Control circuit described in it adopted is SSC1641 control chip, only support BFSK communication mode, and can only realize the carrier communication of 270kHz, for there being other frequency range requirements, and the place that other modulation systems require can not meet and the additional EEPROM of needs, wave reception filtering circuit protection diode of the present invention is arranged on the 2nd grade, and protection effect is good not; And power circuit current drain is 3mA, and loss ratio is higher.
Summary of the invention
For addressing the above problem, the object of the invention, in a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern is provided, adopts OFDM modulating mode, and band efficiency is high; The intersymbol interference that multipath transmisstion causes (ISI) and fading problem are solved.
For achieving the above object, the technical solution adopted in the present invention is: a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern, and this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit; Stating carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit power supply.
Further, the resolution of described ADC module is 10.
Further, described OFDM base band is connected with AFE.
Further, described carrier Control circuit is connected with interface circuit and indicator light.
Further, described wave reception filtering circuit comprises two stage filter circuit, and wherein, first order filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit; Second level filter circuit output is parallel with clamp circuit.
Again further, described clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.
Further, described signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be 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 connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.
Further, described power unit is 3.3V power supply, by DC/DC module composition.
Beneficial effect:
Compared with prior art, the low voltage power line carrier chip based on the modulation of OFDM pattern of the present invention, flank speed reaches 150kbps, and utilizes 128bits AES encryption mechanism, has ensured the fail safe of communication.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present invention;
Fig. 2 is SSC1650 circuit structure block diagram of the present invention;
Fig. 3 is current-limiting circuit circuit theory diagrams of the present invention;
Fig. 4 is ESPA16 chip periphery circuit theory diagrams of the present invention;
Fig. 5 is ESPA16 chip structure figure of the present invention;
Fig. 6 is the circuit theory diagrams of coupling circuit of the present invention and wave reception filtering circuit;
Fig. 7 is the circuit theory diagrams of zero cross detection circuit of the present invention;
Fig. 8 is the circuit block diagram of power unit of the present invention;
Fig. 9 is OFDM modulation system schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As depicted in figs. 1 and 2, the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern of the present invention, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit; Stating carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit 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, do not repeat them here.
As shown in Figure 8, described wave reception filtering circuit comprises two stage filter circuit, and wherein, first order filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit; Second level filter circuit output is parallel with clamp circuit; Described clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.
As shown in Figure 4 and Figure 5, described signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be 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 connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.
As shown in Figure 8, described power unit is 3.3V power supply, by DC/DC module composition.
As shown in Figure 9, this chip adopts ofdm communication mode, i.e. orthogonal frequency division multiplexi, is the one of MCM (Multi-CarrierModulation) multi-carrier modulation; Its main thought is: channel is divided into some orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, be modulated on every sub-channels and transmit; Orthogonal signalling can, by adopting correlation technique to separate at receiving terminal, can reduce the phase mutual interference ICI between subchannel like this; Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and therefore the flatness of can regarding as on every sub-channels declines, thereby can eliminate intersymbol interference; And because the bandwidth of every sub-channels is only the sub-fraction of former channel width, it is relatively easy that channel equalization becomes.
Embodiment recited above is described the preferred embodiment of the present invention, not the spirit and scope of the present invention is limited.Do not departing under the prerequisite of design concept of the present invention; various modification and improvement that this area ordinary person makes technical scheme of the present invention; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, has all been documented in claims.
Claims (8)
1. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, it is characterized in that: described carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit power supply.
2. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: the resolution of described ADC module is 10.
3. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described OFDM base band is connected with AFE.
4. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described carrier Control circuit is connected with interface circuit and indicator light.
5. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, it is characterized in that: wave reception filtering circuit comprises three grades of filter circuits, wherein, first order filter circuit connects signal coupling circuit, and third level filter circuit connects carrier Control circuit; Third level filter circuit output is parallel with clamp circuit.
6. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 3, is characterized in that: clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.
7. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, it is characterized in that: signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be 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 connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.
8. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described power unit is 3.3V power supply, by DC/DC module composition.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN103795442B CN103795442B (en) | 2016-09-21 |
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Cited By (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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Cited By (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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| CN103795442B (en) | 2016-09-21 |
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