CN202998093U - Bifrequency power line carrier communication apparatus - Google Patents
Bifrequency power line carrier communication apparatus Download PDFInfo
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- CN202998093U CN202998093U CN 201220635182 CN201220635182U CN202998093U CN 202998093 U CN202998093 U CN 202998093U CN 201220635182 CN201220635182 CN 201220635182 CN 201220635182 U CN201220635182 U CN 201220635182U CN 202998093 U CN202998093 U CN 202998093U
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- frequency
- power line
- bifrequency
- line carrier
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Abstract
The utility model provides a bifrequency power line carrier communication apparatus, which is used for realizing high-frequency power line carrier communication and low-frequency power line carrier communication. The apparatus comprises a bifrequency transmission device and a bifrequency reception device, wherein the bifrequency reception device comprises a reception signal carrier frequency determination module which includes a high-frequency band pass filter centered by high frequency and a low-frequency band pass filter centered by low frequency which are controlled by a microprocessor. According to the bifrequency power line carrier communication apparatus, two carrier devices of different frequencies are combined together, and because a receiver can immediately identify the frequency of a transmitter, the apparatus is compatible with the original single frequency system, thereby realizing the smooth transition from single frequency to double frequency. Besides, a switch-type filtering circuit is used for separately filtering the two frequencies with a large distance therebetween, and the filtering effect of single frequency is as same as the original system, so that the band width needs not to be increased for covering the two frequencies.
Description
Technical field
The utility model relates to power line carrier communication field, particularly a kind of communicator that utilizes different frequency sending and receivings.
Background technology
Power line carrier communication is with the communication mode of high-frequency carrier signal by high pressure or low-voltage power line transmission information.Traditional power line carrier device uses single frequency to communicate, and centre frequency filter circuit after selecting namely designs as the center.The shortcoming of this unifrequency system is to process co-channel interference, and common frequency-selecting decay on power line.So-called co-channel interference refers to interfering frequency near centre carrier frequency, causes filter circuit invalid.And frequency-selecting decay refers to that on power line, distributed inductance and capacitance parameter have formed bandreject filtering, and is serious to a certain frequency decay.In addition, two different unifrequency systems be owing to interconnecting, and bring difficulty on engineering also for the enforcement of power line carrier.
The utility model content
The utility model uses single frequency to communicate at present traditional power line carrier device, can't process co-channel interference, and the deficiency of common frequency-selecting decay on power line, and a kind of bifrequency device for power line carrier communications is provided.
The utility model is especially for present use two frequency 270kHZ and 421kHZ comparatively widely, can accomplish and existed system compatible, can be used as again switching node the unifrequency equipment of two different frequencies can be interconnected.
The utility model for the technical scheme of completing its technical purpose and adopting is: a kind of bifrequency device for power line carrier communications, realize high-frequency power line carrier communication and low frequency power line carrier communication, comprise bifrequency dispensing device and bifrequency receiving system, comprise at described bifrequency receiving system receiving the signal(-) carrier frequency determination module, described reception signal(-) carrier frequency determination module comprises by the high freguency bandpass filter centered by high-frequency of microprocessor control and the low frequency bandpass filter centered by low frequency.
Further, in above-mentioned bifrequency device for power line carrier communications: the beat frequency oscillator and the frequency mixer that also comprise the difference that produces high and low frequency in described bifrequency receiving system, the input of described frequency mixer accesses respectively low frequency power line carrier communication signal or the high-frequency power line carrier communication signal of difference frequency signal and reception, described difference frequency signal input mixer is controlled by microprocessor, intermediate frequency filtering and the demodulator circuit of the described bifrequency receiving system of output termination of described frequency mixer.
Further, in above-mentioned bifrequency device for power line carrier communications: described high-frequency is 421kHz, and low frequency is 270kHz.
Further, in above-mentioned bifrequency device for power line carrier communications: also comprise power line power frequency zero-crossing detection circuit, described power line power frequency zero-crossing detection circuit is connected with microprocessor.
The utility model can combine the carrier equipment of two different frequencies, can immediately differentiate the frequency of transmit leg due to the recipient, therefore can with original unifrequency system compatible, realize single-frequency seamlessly transitting to double frequency.The utility model adopts the suitching type filter circuit, can be to two frequency filtering respectively that distance is larger, and the filter effect of single frequency is consistent with original system, need to not cover two frequencies to increase bandwidth.After using bifrequency, system can effectively tackle co-channel interference and frequency-selecting decay, and communication is more reliable and more stable.
Below by specific embodiment by reference to the accompanying drawings, the utility model is further detailed.
Description of drawings
Accompanying drawing 1, the utility model embodiment bifrequency dispensing device theory diagram.
Accompanying drawing 2, the utility model embodiment bifrequency receiving system theory diagram.
Accompanying drawing 3, be that the utility model embodiment bifrequency receives signal schematic representation.
Accompanying drawing 4, be that the utility model embodiment bifrequency receives signal spectrum figure.
Accompanying drawing 5, the utility model embodiment bifrequency dispensing device principle sketch.
Accompanying drawing 6, the utility model embodiment bifrequency receiving system principle sketch.
Accompanying drawing 7, the utility model embodiment bifrequency communicator switch figure.
Mixing principle sketch in accompanying drawing 8, the utility model embodiment bifrequency receiving system.
Embodiment
The present embodiment is the bifrequency carrier communication device of a kind of 421kHZ and 270kHz, and transmitting terminal selects arbitrary frequency carrier signal to carry out the FSK modulation to data-signal, and then signal spectrum sends modulated signal as shown in Figure 3 by power line carrier; Simultaneously, confirm by detection that at receiving terminal carrier frequency that transmitting terminal adopts is in 421kHZ or 270kHz carrier signal, and the modulated signal that receives is carried out demodulation.
Two channels of the present embodiment use respectively 421kHZ and 270kHZ frequency.Two channels are the FSK modulation system, 421kHZ before and after the zero crossing each 1.5ms as the transmission time groove, i.e. so-called zero passage transmission means, bit rate is 13.33kHZ; 270kHZ is take 3.024ms as a chip, and bit rate is 20.83kHZ, and transmission means is transmission continuously or zero crossing transmission.
The power frequency zero-crossing detection circuit provides A phase time benchmark for microprocessor.B phase and C zero crossing mutually can be calculated by software.
Diverter switch SGM4717 is adopted in suitching type filtering, and as shown in Fig. 5,6,7, transformer BT1/BT2 inductance value is respectively 94uH/28uH, and during corresponding 421kHZ, the pairing capacitance is 1.5nF/5.1nF, during corresponding 270kHZ, and pairing capacitance 3.7nF/12.4nF.BT1 is used for accepting filter, and BT2 is used for sending filtering.
Dispensing device such as Fig. 1 and shown in Figure 5, after the modulated carrier signal of 421kHz or 270kHz passes through a band-pass filter, send by power line carrier, as shown in Figure 1, in the present embodiment, band pass filter is controlled by a switch, when select be high-frequency modulated carrier signal the time, utilize processor MCU to control two electric capacity in parallel and disconnect, here, the centre frequency of band pass filter will be 421kHz, if what select is in the time of will sending low-frequency signal, the MCU control switch is closed, and at this moment, the centre frequency of band pass filter is 270kHz.The frequency spectrum of two kinds of signal bandpass filterings as shown in Figure 4.
As Fig. 5, shown in Figure 7, during transmission, Micro-processor MCV produces square wave output SSCOUT or the SSCOUT1 of corresponding frequencies, and both transmitted powers are had any different, and software is selection intensity as required.BT2 and C26 C27 form the 421kHZ filter network, and when analog switch is connected NO2 and COM2 as shown in Figure 7, increase C4 C5 and form the 270kHZ filter network.The BT2 filter network produces two reverse sine wave drive VT1 and VT2, sends signal to BT1 and is coupled to power line.
equally, the device that similarly changes the band pass filter centre frequency by the conversion capacitance size is also arranged in receiving system, as shown in Figure 2, physical circuit as shown in Figure 6, simultaneously, as shown in Figure 8, also pass through switch, the low-frequency signals that receives is carried out the mixing rate, produce the signal consistent with high-frequency signal, then carry out demodulation, when receiving low-frequency signal, it is the signal of 270kHz in the present embodiment, need to carry out producing intermediate-freuqncy signal after mixing through the mixing chip of MC3361, here poor is 151kHz, the intermediate-freuqncy signal that produces is exactly the high-frequency signal of 421kHz.Therefore, here can receive two kinds of carrier signals of 421kHz or 270kHz, if receive the signal of 270kHz, also need by the slip frequency signal mixing generation 421kHz signal of mixing with the local 151kHz that produces, whether mixing rate device adds by the output of MCU control timer realizes.If what receive is that 421kHz signal MCU will control not the slip frequency signal that adds 151kHz in the frequency mixer, the mixing chip of MC3361 will be only an amplifier like this, the 421kHz signal be amplified, so that demodulation later on.Therefore, this receiving circuit is compared with the single-frequency receiver, has only increased this mixting circuit, has increased in addition one and whether select the selector switch of shunt capacitance in receiving filter, and this switch is synchronizeed with the difference signal in being input to mixting circuit.
Signal frequency is confirmed the course of work: the 3ms take A phase zero crossing as benchmark is used for receiving 421kHZ, microprocessor switch to disconnect COM1 and is connected connection with NC1, this moment, C16 C17 was connected with BT1_6 BT1_8, form the 421kHZ frequency-selective network, MCU closes the 151kHz clock simultaneously, the MC3361 frequency mixer uses as amplifier, exports restituted signal from FM demodulator after signal is amplified.Microprocessor carries out the AD sampling to the FSK restituted signal, detects wherein whether there is effective frame head data, if having record once and confirm.The 3.024ms of second zero crossing (B phase zero crossing) time slot, microprocessor switched conductive COM1 and NC1, in parallel with C16 C17 and BT1_6 BT1_8 after C1 C2 series connection this moment C21, form the 270kHZ frequency-selective network, MCU opens the 151kHZ clock simultaneously, the work of MC3361 frequency mixer will obtain the 421kHz intermediate frequency after the mixing of 270kHZ signal, demodulation output after ceramic filter filtering.Microprocessor is sampled to restituted signal, and whether detect wherein has effective frame head data, if any once confirmation of record.The 3rd zero crossing (during C phase zero crossing) reaffirms as two frequencies, signal is arranged to the frequency that samples useful signal, the quality of signal compared, the 3rd zero crossing only to signal quality preferably frequency reaffirm.
Claims (4)
1. bifrequency device for power line carrier communications, realize high-frequency power line carrier communication and low frequency power line carrier communication, comprise bifrequency dispensing device and bifrequency receiving system, it is characterized in that: comprise at described bifrequency receiving system receiving the signal(-) carrier frequency determination module, described reception signal(-) carrier frequency determination module comprises by the high freguency bandpass filter centered by high-frequency of microprocessor control and the low frequency bandpass filter centered by low frequency.
2. bifrequency device for power line carrier communications according to claim 1, it is characterized in that: the beat frequency oscillator and the frequency mixer that also comprise the difference that produces high and low frequency in described bifrequency receiving system, the input of described frequency mixer accesses respectively low frequency power line carrier communication signal or the high-frequency power line carrier communication signal of difference frequency signal and reception, described difference frequency signal is controlled by microprocessor, when receiving low frequency power line carrier communication signal, the output of microcontroller difference frequency signal produces the signal of the difference of high and low frequency; When receiving high-frequency power line carrier communication signal, the microcontroller difference frequency signal is output as 0kHZ; Intermediate frequency filtering and the demodulator circuit of the described bifrequency receiving system of output termination of described frequency mixer.
3. bifrequency device for power line carrier communications according to claim 1, it is characterized in that: described high-frequency is 421kHz, low frequency is 270kHz.
4. arbitrary described bifrequency device for power line carrier communications according to claim 1 to 3, it is characterized in that: also comprise power line power frequency zero-crossing detection circuit, described power line power frequency zero-crossing detection circuit is connected with microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220635182 CN202998093U (en) | 2012-11-27 | 2012-11-27 | Bifrequency power line carrier communication apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220635182 CN202998093U (en) | 2012-11-27 | 2012-11-27 | Bifrequency power line carrier communication apparatus |
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| CN202998093U true CN202998093U (en) | 2013-06-12 |
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| CN 201220635182 Expired - Lifetime CN202998093U (en) | 2012-11-27 | 2012-11-27 | Bifrequency power line carrier communication apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023533A (en) * | 2012-11-27 | 2013-04-03 | 祝文闻 | Communication method and communication device for dual-frequency power line carrier |
| CN105024735A (en) * | 2015-08-05 | 2015-11-04 | 成都君禾天成科技有限公司 | Alarm receiving circuit employing power line communication |
-
2012
- 2012-11-27 CN CN 201220635182 patent/CN202998093U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023533A (en) * | 2012-11-27 | 2013-04-03 | 祝文闻 | Communication method and communication device for dual-frequency power line carrier |
| CN103023533B (en) * | 2012-11-27 | 2014-09-17 | 祝文闻 | Communication method and communication device for dual-frequency power line carrier |
| CN105024735A (en) * | 2015-08-05 | 2015-11-04 | 成都君禾天成科技有限公司 | Alarm receiving circuit employing power line communication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN CORE LONG ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHU WENWEN Effective date: 20150717 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150717 Address after: 7 B building, building five, Longjing second industrial zone, Pearl Dragon Road, Nanshan District, Shenzhen, Guangdong 518000, China Patentee after: SHENZHEN NEOTECWAY ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province in Longjing Nanshan District North Industrial Zone 9 05 Patentee before: Zhu Wenwen |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Bifrequency power line carrier communication apparatus Effective date of registration: 20171107 Granted publication date: 20130612 Pledgee: Shenzhen high tech investment and financing Company limited by guarantee Pledgor: SHENZHEN NEOTECWAY ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: 2017990001038 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20180416 Granted publication date: 20130612 Pledgee: Shenzhen high tech investment and financing Company limited by guarantee Pledgor: SHENZHEN NEOTECWAY ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: 2017990001038 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |
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| CX01 | Expiry of patent term |