CN102497220A - Calling system based on flexible alternating current signal technology and communication method for calling system - Google Patents
Calling system based on flexible alternating current signal technology and communication method for calling system Download PDFInfo
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- CN102497220A CN102497220A CN2011104136670A CN201110413667A CN102497220A CN 102497220 A CN102497220 A CN 102497220A CN 2011104136670 A CN2011104136670 A CN 2011104136670A CN 201110413667 A CN201110413667 A CN 201110413667A CN 102497220 A CN102497220 A CN 102497220A
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Abstract
The invention discloses a calling system based on a flexible alternating current signal technology. The system comprises a power line, a tail end signal transmission device and a head end signal receiving device, wherein the tail end signal transmission device and the head end signal receiving device are arranged on and connected to the power line through sockets. A communication method based on a flexible alternating current signal comprises the following steps that: 1) a transmitter detects whether the line bears information or not; 2) the transmitter loads the information onto a voltage waveform; 3) a receiver detects whether the line carries the information or not; and 4) the receiver interprets the information, and gives a response. Compared with a special communication line, the power line is not required to be rewired, and is suitable for alteration. Compared with the conventional calling system and the conventional power carrier calling system, the calling system is simple and easy, and simultaneously can maximally reduce the interference of background noise over a calling signal. Compared with wireless communication, the invention has high reliability, and can avoid the interference over other equipment.
Description
Technical field
The present invention relates to the communications field, the apparatus and method that particularly a kind of power circuit power frequency voltage waveform communicates.
Background technology
Along with socioeconomic continuous development, rise energetically as the service trade of the tertiary industry, in order to guarantee the favorable service quality; Realize higher efficiency of service; All can use calling system in a lot of service industries, for example, service locations such as hospital, dining room and KTV.Therefore having or not and quality of calling system can produce very big influence to people's quality of life, and sometimes even entail dangers to people's life, a good calling system has social effect and great practical value widely.
Traditional calling system generally adopts the special circuit transmission means, but because its wiring installation is loaded down with trivial details, safeguards inconvenience, therefore causes its cost performance very low.
Because the wireless type calling system has appearred in all limitations of traditional calling system, it sends call signal through wireless signal transmitting module and transfers to information processing centre; Be sent to large-screen display board after treatment, though there is not wiring problem in the wireless type calling system, its poor reliability; And radio wave brings interference can for other equipment; Especially in hospital, injure people's life sometimes, so the use of wireless calling system also is restricted at present.
Based on above-mentioned situation, there is the scholar to propose calling system in recent years based on power line carrier technology.Low-voltage powerline carrier communication (power line communication; PLC) be meant the existing power line of utilization; The analog or digital signal is carried out the technology of high-speed transfer through carrier system; Its maximum characteristics are not need to set up again transmission network, as long as live wire just can carry out data passes.But because the direct user oriented of low-voltage network, these intrinsic characteristics make its communication environment extremely abominable, as: load condition is complicated, and noise jamming is strong and have time variation, and signal attenuation is big, and channel capacity is little etc.Therefore, realize that high performance low-voltage powerline carrier communication has sizable difficulty.
Summary of the invention
One object of the present invention just provides a kind of calling system based on flexible AC signal technology, and it utilizes existing power circuit to communicate, and is simple and reliable, does not need to increase again transmission network.
This purpose of the present invention is to realize through such technical scheme, and it includes power circuit, is connected terminal sender unit and the head end signal receiving device on the power circuit through the socket installation;
Terminal sender unit is loaded into the address signal of calling out transmitting terminal among the power frequency voltage waveform in the power circuit;
The head end signal receiving device is used for detecting the signal that voltage waveform carried of power circuit, and the information that conversion of signals is read for the user.
Further; Said terminal sender unit includes thyristor units, triac controller and voltage check device; Thyristor-controlled system device is used to control the conducting of thyristor units; Send signal to circuit, voltage check device detects in real time and handles port voltage, whether to judge on the circuit beared information.
Further; Said head end signal receiving device includes core controller, display unit and voltage check device; Voltage check device is connected with power circuit through socket, and core controller is used to receive the detected data of voltage check device, and realizes signal extraction, conversion and decoding; Information after the decoding is sent to display unit, drives display unit and show.
Another object of the present invention just provides a kind of communication means based on flexible AC signal, and its Principle of Communication is simple, and is practical reliable.
This purpose of the present invention is to realize that through such technical scheme its step is following:
1) terminal sender unit detects on the power circuit whether carry information through voltage check device; If power circuit carries information and transmits; Then terminal sender unit postpones preset time T and detects, does not have beared information to transmit on the power circuit, then changes step 2 over to);
2) conducting of terminal sender unit through the control thyristor units is loaded into the address information of transmitting terminal among the power circuit power frequency voltage waveform;
3) the head end signal receiving device detects the voltage waveform information on the power circuit through voltage check device; And voltage waveform information extracted, changes and decipher; If do not have beared information on the voltage waveform; Then continue power circuit is detected,, then change step 4) over to if carried information on the voltage waveform;
4) power circuit is entrained transmitting terminal address information shows through display, sends audio signal simultaneously and notifies the staff to receive, and accomplishes communication process.
The pairing duration of binary code when further, preset time T described in the step 1) is each the signalling.
Further; The method whether terminal sender unit and head end signal receiving device detection power circuit carry information is: terminal sender unit is the binary message character string with the information translation of required transmission; Before every string binary message character string, add first sign indicating number, first sign indicating number is set to " 1 "; Voltage check device detects binary code " 1 " and then carries information on the power circuit, otherwise does not then have beared information on the power circuit.
Further; Terminal sender unit is to be carried in the power frequency voltage waveform string of binary characters information and the method transmitted is: terminal sender unit carries out short circuit with power supply in a bit of time before voltage over zero through the break-make of controlling thyristor units endways, and then causes the distortion of voltage waveform, is a unit with two power frequency periods; Carry out in one of them cycle in each unit; Thereby form one the state that do not have is arranged, utilize signal to receive two adjacent power frequency period signals are subtracted each other, thereby can obtain a signal that frequency is high slightly with checkout gear; Represent binary digit " 1 " with this; Two cycles in unit all do not have short-circuit signal, then subtract each other the no id signal appearance in back, represent binary digit " 0 " with this.Each unit can represent a binary code, and continuous several cycles are carried out the signal modulation, then can produce the multidigit binary code.
Owing to adopted technique scheme, the present invention to have following advantage:
With respect to the special line communication circuit, the present invention need not rewiring, is suitable for transforming again, compares the traditional calling system and the power carrier calling system is simple, can subdue the interference of background noise to call signal to greatest extent simultaneously.
With respect to radio communication, good reliability of the present invention can not bring interference to other equipment.
Other advantages of the present invention, target and characteristic will be set forth in specification subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from practice of the present invention, obtain instruction to investigating of hereinafter.Target of the present invention and other advantages can realize and obtain through following specification and claims.
Description of drawings
Description of drawings of the present invention is following:
Fig. 1 is a voltage waveform beared information schematic diagram;
Fig. 2 is the structural representation of binary signal coding;
Fig. 3 is the calling system structural representation;
Fig. 4 is terminal sender unit structural representation;
End signal receiving system structural representation headed by Fig. 5;
Fig. 6 is a communication means FB(flow block) of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
This calling system adopts a kind of flexible AC signal technology to be achieved, and its core concept is to utilize the distortion of grid voltage waveform to carry information.With the carrier of low-voltage distributing line as signal of communication; Through the conducting of sender unit control thyristor endways; Signal is being superimposed upon near the voltage over zero on the fundamental voltage; Signal in that the head end signal receiving device comprises in to voltage waveform is discerned, and on base of recognition, signal source is positioned, and realizes terminal call function to head end with this.
As shown in Figure 1; The specific embodiments of AC signal technology is meant under the prerequisite that does not influence the quality of power supply flexibly; Break-make through control thyristor at head end is carried out short circuit with power supply in a bit of time before voltage over zero, and then causes the distortion of voltage waveform.With two power frequency periods is a unit; Aforementioned process was carried out in one of them cycle in each unit; Thereby form one the state that do not have is arranged, utilize signal to receive two adjacent power frequency period signals (i.e. unit) are subtracted each other, thereby can obtain a signal that frequency is high slightly with checkout gear; Represent binary digit " 1 " with this, like the 3rd among Fig. 1 and the 4th cycle.If two cycles in unit all do not have short-circuit signal, then subtract each other the no id signal appearance in back, represent binary digit " 0 " with this, like the 1st among Fig. 1 and the 2nd cycle.Each unit can represent a binary code, and continuous several cycles are carried out signal modulation, then can produce the multidigit binary code, thereby can a plurality of different terminal of corresponding expression number, and for example 8 binary codes can be represented 28 terminal numbers at most.
For the ease of signal code is discerned; " first sign indicating number " as the coding position that signal imports into, is called in binary-coded first place among the present invention, it is not deciphered as data bit; It is set to all the time " 1 ", explains have signal to send when first sign indicating number occurs when detecting.A binary string that comprises 8 bit data positions and a first sign indicating number position is as shown in Figure 2, and it can represent 28 terminal numbers at most, can be according to the length that how much increases and decreases data bit at terminal when practice.
The useful signal of representing binary digit " 1 " is to obtain after adjacent two periodic voltage waveform signals subtract each other, because two adjacent periods interval times are extremely short, can eliminate the interference of background noise to useful signal after subtracting each other, and this is the outstanding advantage place of this method.
As shown in Figure 3, a kind of calling system based on flexible AC signal technology, it includes power circuit, is connected terminal sender unit and the head end signal receiving device on the power circuit through the socket installation;
Terminal sender unit is loaded into the address signal of calling out transmitting terminal among the power frequency voltage waveform in the power circuit;
The head end signal receiving device is used for detecting the signal that voltage waveform carried of power circuit, and with the information of conversion of signals for supplying the user to read.
As shown in Figure 4; Said terminal sender unit includes thyristor units, triac controller and voltage check device; Voltage check device is connected with power circuit through socket, and controller is used for controlling the conducting of thyristor on the one hand, sends signal with this to circuit; On the other hand, under the cooperation of voltage check device, port voltage is detected in real time and handles, extract the first sign indicating number that is encoded to " 1 "; Occur if detected first sign indicating number, then its corresponding marker bit is set at " 1 ", and continues a bit of time; This section period can be fixed as the shared time T of binary code; For example, the pairing time of the binary code among Fig. 2 is T=0.36s, and flag bit can be served as by a certain position of register in the controller.
When call request, the caller can enabling signal dispensing device, the at first flag bit of register in the access controller; If flag bit is " 0 "; Then explanation does not have carrying signal in the circuit this moment, through the conducting of control thyristor, this terminal corresponding address code signal is imported in the circuit; If flag bit is " 1 ", then explanation carries signal in the circuit this moment, and time-delay Ts continued is discerned flag bit, and distinguishing rule is identical with aforementioned process.
As shown in Figure 5; Said head end signal receiving device includes core controller, display unit and voltage check device; Voltage check device is connected with power circuit through socket, and core controller is used to receive the detected data of voltage check device, and realizes signal extraction, conversion and decoding; Information after the decoding is sent to display unit, drives display unit and show.
As shown in Figure 6, a kind of communication means based on flexible AC signal technology, its step is following:
1) terminal sender unit detects on the power circuit whether carry information through voltage check device; If power circuit carries information and transmits; Then terminal sender unit postpones preset time T and detects, if there is not beared information to transmit on the power circuit, then changes step 2 over to);
2) conducting of terminal sender unit through the control thyristor is loaded into the address information of transmitting terminal among the power circuit power frequency voltage waveform;
3) the head end signal receiving device detects the voltage waveform information on the power circuit through voltage check device; And voltage waveform information extracted, changes and decipher; If do not have beared information on the voltage waveform; Then continue power circuit is detected,, then change step 4) over to if carried information on the voltage waveform;
4) power circuit is entrained transmitting terminal address information process is extracted, is changed and decoding, and shows through display, sends audio signal simultaneously and notifies the staff to respond, and accomplishes communication process.
Communication means according to the invention can be accomplished the communication process of terminal sender unit to the head end signal receiving device, only carries a segment information on the same time power circuit, can avoid the phase mutual interference between the too much information, guarantees communication quality.When terminal sender unit was arranged in communication, all the other wanted the equal delayed delivery of terminal sender unit of communicating by letter, and carry out dispatcher queue.
The pairing duration of binary code can be adjusted according to terminal signal source quantity and binary code length when preset time T described in the step 1) was each the signalling.
Utilize binary digital information transmission, the beared information amount is big, and it is more accurate to transmit, and reduces the communication error rate, and accurately detects power circuit and whether carried information, improves judging nicety rate.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. calling system based on flexible AC signal technology is characterized in that: it includes power circuit, install through socket and be connected terminal sender unit and the head end signal receiving device on the power circuit;
Terminal sender unit is loaded into the address signal of calling out transmitting terminal among the power frequency voltage waveform in the power circuit;
The head end signal receiving device is used for detecting the signal that voltage waveform carried of power circuit, and the information that conversion of signals is read for the user.
2. a kind of calling system as claimed in claim 1 based on flexible AC signal technology; It is characterized in that: said terminal sender unit includes thyristor units, triac controller and voltage check device; Thyristor-controlled system device is used to control the conducting of thyristor units; Send signal to circuit, voltage check device detects in real time and handles port voltage, whether to judge on the circuit beared information.
3. according to claim 1 or claim 2 a kind of calling system based on flexible AC signal technology; It is characterized in that: said head end signal receiving device includes core controller, display unit and voltage check device; Voltage check device is connected with power circuit through socket, and core controller is used to receive the detected data of voltage check device, and realizes signal extraction, conversion and decoding; Information after the decoding is sent to display unit, drives display unit and show.
4. like any said method that communicates based on the calling system of flexible AC signal technology of claim 1-3, it is characterized in that its step is following:
1) terminal sender unit detects on the power circuit whether carry information through voltage check device; If power circuit carries information and transmits; Then terminal sender unit postpones preset time T and detects, does not have beared information to transmit on the power circuit, then changes step 2 over to);
2) conducting of terminal sender unit through the control thyristor units is loaded into the address information of transmitting terminal among the power circuit power frequency voltage waveform;
3) the head end signal receiving device detects the voltage waveform information on the power circuit through voltage check device; And voltage waveform information extracted, changes and decipher; If do not have beared information on the voltage waveform; Then continue power circuit is detected,, then change step 4) over to if carried information on the voltage waveform;
4) power circuit is entrained transmitting terminal address information shows through display, sends audio signal simultaneously and notifies the staff to receive, and accomplishes communication process.
5. the communication means based on flexible AC signal as claimed in claim 4 is characterized in that: the pairing duration of binary code when preset time T described in the step 1) is each the signalling.
6. the communication means based on flexible AC signal as claimed in claim 4; It is characterized in that; The method whether terminal sender unit and head end signal receiving device detection power circuit carry information is: terminal sender unit is the binary message character string with the information translation of required transmission; Before every string binary message character string, add first sign indicating number; First sign indicating number is set to " 1 ", and voltage check device detects binary code " 1 " and then carries information on the power circuit, otherwise does not then have beared information on the power circuit.
7. the communication means based on flexible AC signal as claimed in claim 6 is characterized in that, terminal sender unit is to be carried in the power frequency voltage waveform string of binary characters information and the method transmitted is: terminal sender unit carries out short circuit with power supply in a bit of time before voltage over zero through the break-make of controlling thyristor units endways; And then cause the distortion of voltage waveform, and be a unit with two power frequency periods, carry out in one of them cycle in each unit; Thereby form one the state that do not have is arranged; Utilize signal to receive two adjacent power frequency period signals are subtracted each other, thereby can obtain a signal that frequency is high slightly, represent binary digit " 1 " with this with checkout gear; Two cycles in unit all do not have short-circuit signal; Then subtract each other the no id signal in back and occur, represent binary digit " 0 " with this, each unit can represent a binary code; Continuous several cycle is carried out the signal modulation, then can produce the multidigit binary code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110413667.0A CN102497220B (en) | 2011-12-13 | 2011-12-13 | Calling system based on flexible alternating current signal technology and communication method for calling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110413667.0A CN102497220B (en) | 2011-12-13 | 2011-12-13 | Calling system based on flexible alternating current signal technology and communication method for calling system |
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| CN102497220A true CN102497220A (en) | 2012-06-13 |
| CN102497220B CN102497220B (en) | 2014-09-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109900952A (en) * | 2019-03-13 | 2019-06-18 | 清华四川能源互联网研究院 | A kind of transient signal rapidly extracting processing method |
| CN110692202A (en) * | 2017-04-26 | 2020-01-14 | 沃尔特瑟弗儿公司 | Method for verifying integrity of digital power line |
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| CN202042024U (en) * | 2011-05-31 | 2011-11-16 | 吉林省电力有限公司白城供电公司 | On-line monitoring and protecting device for transformer |
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2011
- 2011-12-13 CN CN201110413667.0A patent/CN102497220B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997031430A1 (en) * | 1996-02-21 | 1997-08-28 | Citycom S.P.A. | System for data transmission, remote sensing, remote controls, remote readings and the like, particularly suitable for the electric power distribution lines |
| JPH11266191A (en) * | 1998-03-17 | 1999-09-28 | Mitsubishi Electric Corp | Method and device for transmission |
| CN1289187A (en) * | 1999-09-20 | 2001-03-28 | 北京海通嘉讯科技有限公司 | Encoding communication method |
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| CN101980415A (en) * | 2010-10-09 | 2011-02-23 | 华北电力大学 | Method and system for implementing active uplink power line power-frequency communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110692202A (en) * | 2017-04-26 | 2020-01-14 | 沃尔特瑟弗儿公司 | Method for verifying integrity of digital power line |
| CN109900952A (en) * | 2019-03-13 | 2019-06-18 | 清华四川能源互联网研究院 | A kind of transient signal rapidly extracting processing method |
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| CN102497220B (en) | 2014-09-24 |
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