CN108717799A - A kind of radio communication station board system of bus station - Google Patents

Abstract

The present invention relates to a kind of radio communication station board systems of bus station, are communicated using nRF905 radio-frequency modules between bus and bus station, and bus station's nRF905 radio-frequency communication modules monitor aerial information, receive bus arrival data.The AC power of intelligent display station board is taken along the road lamp power supply on road, and Centralized Controller uses power line communication, Centralized Controller to access mobile radio communication network by 4G wireless routers with intelligent display station board.Passenger also cell phone application can be used to check each road bus arrival situation.

Description

A kind of radio communication station board system of bus station

(1) technical field：

The present invention relates to a kind of radio communication station board systems of bus station, including Centralized Controller and each intelligent display station Board is crossed 0 area's specified point to grid cyclic wave voltage and sends wide pulse signal generation mutation current, made using power line communication method For the position value of signal, Centralized Controller receives the data of each intelligent display station board acquisition, and accesses 4G by wireless router Mobile radio communication network, from regardless of all mobile phone, computer and handheld mobile device can be used to realize Wireless Networking in where.

(2) background technology：

The communication of current power line refers mainly to power line carrier communication and bi-directional Glenn shunt.Power line carrier communication PLC profits Signal is transmitted by carrier system with existing power line.But distribution transformer has iris action to power carrier signal, simultaneously Transmission has the very big loss of signal again between three-phase power line, so power carrier signal can only be in a distribution transformer platform area Transmission, and can only be transmitted in single-phase electricity line.In practical application, when power line zero load, point-to-point carrier signal can be transferred to Several kilometers, but when load is very heavy on power line, tens meters can only be transmitted, therefore power line carrier communication is only applied remote at present In journey meter reading, also need to coordinate other means of communication.

Bi-directional Glenn shunt TWACS is utilized is added modulated signal in power-frequency voltage fundamental wave zero passage area, with the electricity in this region The distorted signal of pressure or current waveform carries information.TWACS system equipments exist only in substation and user terminal.Wherein by power transformation The stand channel transmitted to user terminal is output channel, carries information using the modulation of voltage waveform, is passed from user terminal to substation Defeated channel is input channel, and information is transmitted using the variation of current waveform.Its receiving and transmitting signal passes through coupling transformer and electricity Power net is crosslinked.

The detection of TW A CS signals is mainly based upon time-domain difference technology, these methods mostly data processing complex, in real time Property it is poor, equipment cost is high, needs to acquire a large amount of signal of multiple cycles relatively and carries out A/D conversions respectively, then carries out complicated meter It calculates, just can determine that the signal position is " 1 " or " 0 ", due to the preciseness of calculating, interference signal can seriously affect detected signal Judgement as a result, therefore original method be difficult China apply.

Clock timer and synchrotimer is arranged in the present invention, and the true and false judgement of synchrotimer and cycle signal is screened With reference to my 2016 yearly correlation patents.

(3) invention content：

Power line bi-directional Glenn shunt be when silicon-controlled 30 ° of triggering and conductings before zero crossing of modulation circuit, by every Modulated signal is generated from transformer, makes grid cyclic wave that short circuit distortion occur, exports the frequency of modulated signal in 200~600Hz Range, receiving terminal demodulate useful letter by acquisition, A/D conversions and the series of computation to multigroup cycle distorted signal Breath.But China's power network uses isolated neutral or small current neutral grounding system, electricity consumption situation is complicated, the two-way power frequency of power line Communication can hardly find practical applications in China.

The present invention relates to a kind of radio communication station board system of bus station, passenger needs to know that each road is public in vehicles such as bus stations Hand over when vehicle arrives at a station, each road bus arrival situation opened in front of bus station's one intelligent display station board of installation is shown. The Vehicle Controller of bus and the intelligent display station board of bus station include nRF905 radio-frequency communication modules, bus and public transport It is communicated using nRF905 radio-frequency communication modules between standing, adjusting radio communication transmitting-receiving power makes efficient communication range and adjacent public transport It stands and is not overlapped.Each bus is designed with unique number, and number is made of public bus network number and vehicle number, convenient for bus with Bus station is inquired when communicating, and nRF905 utilizes SPI mouthfuls and the microcontroller both-way communication in radio-frequency communication module.Bus station nRF905 Radio-frequency communication module cycles through the handshake of our station public bus network number, bus in a receive mode when, nRF905 detectings Aerial information waits bus station's handshake to be received, when bus nRF905 detects carrier wave identical with receives frequency simultaneously After the handshake for receiving effective public bus network number, bus station then cycles through the bus number of the public bus network, after Continuous when shaking hands successfully, after a correct data packet receives, microcontroller carries in bus station's nRF905 radio-frequency communication modules Effective reception data in data packet are taken, when the valid data for once communicating all receive, bus station's microcontroller controls NRF905 enters standby mode.It sends cycle and is in detecting state, recursive call sends function.

The AC power of intelligent display station board is taken along the street lamp special electric power network source on road, in a power transformer platform One Centralized Controller is set in area, and Centralized Controller uses power line communication with intelligent display station board, using power line communication Reduce wiring installation.Microcontroller in Centralized Controller is communicated by serial ports with 4G wireless routers, and by 4G without circuit Mobile radio communication network is accessed by device.Using 4G fast wireless networks as data carrying network, it can be achieved that the service of master station No matter the wireless connection of safety high speed between device and the intelligent display station board of each website, passenger can be used in where from total Cell phone application, computer and the handheld mobile device downloaded of standing check each road bus arrival situation.

The power line communication of use is the signal sending point and signal receiving point by the setting to grid cyclic wave voltage It is accurately positioned, sends a rectangle broad pulse of communication positive or negative pole in the signal sending point of setting to generate mutation electricity Stream, which causes a voltage drop to be superimposed on grid voltage waveform on the short-circuit impedance of distribution transformer, to complete Signal modulation process, signal receiving point demodulated signal of the receiving terminal in the setting of grid cyclic wave voltage；One anode Broad pulse refers to that the high level part of pulse returns 0 from 0 to height.Because only sending single rectangular wave broad pulse to power grid shadow Very little is rung, and signal recall rate simple in structure is high.The microcontroller STC15F2K60S of system, using external crystal-controlled oscillation, frequency 35MHz, signal procedure are write with assembler language, to reduce communication instruction holding time.Or use other model high speed microcontrollers Device.

The setting of signal transmitting and receiving position：It is crossed at 0 in the voltage of grid cyclic wave positive half cycle and 0 voltage comparator was set, in electricity A setting cycle voltage location setting signal voltage comparator between voltage 21V -40V of net week wave positive half cycle.In this way, The output of signal voltage comparator realizes overturning in two positions of all wave voltages of setting of a cycle positive half cycle.Cycle just The position of the setting week wave voltage of half cycle ascent stage is as the first signal location, all wave voltages of setting signal transmitting-receiving point Position is known as the first signal set point, cycle positive half cycle descending branch the setting week wave voltage position as second signal The cycle voltage location of position, setting signal transmitting-receiving point is known as second signal set point.Microcontroller STC15F2K60S can be with It is that rising edge triggers or failing edge triggers that external interrupt, which is arranged, has served as 0 voltage comparator and signal voltage comparator in power grid week The ascent stage of wave positive half cycle or descending branch, which generate after overturning triggering is interrupted, changes down trigger mode, or and by different interruptions Source generates interruption.

The condition that signal transmitting and receiving has：0 voltage comparator of the mistake and signal voltage comparator are all made of ns grades of height Fast voltage comparator.The time mistake that overturning and triggering are interrupted can be reduced using High Speed Microcontroller and high speed voltage comparator Difference, and have the resolution ratio of sufficiently high detection overturning triggering break period, coordinate the position of signal to wipe the skill with synchrotimer Art means improve the recall rate that grid cyclic wave carries information.It needs to transmit by ns grades of high-speed power control switch basis signal Distance it is tests determined by transmitted positive 35V to one between 60V setting rectangular wave broad pulse voltage-drop loading in power grid Signal sending point on cycle, the rectangular wave broad pulse voltage are higher than the voltage for the grid cyclic wave position being loaded.Basis signal The width for the tests determined rectangular wave broad pulse voltage of distance that need to be transmitted is 0.3ms~0.5ms, can provide signal code 1A- 20A.All wave voltages are made to be displaced in the time of the signal location, to make the high speed voltage comparator of receiving terminal be connect in signal Sink is not overturn, is taken " 0 " to send as the position (BIT) in signal, is otherwise taken " 1 " to send for the position (BIT) in signal.Therefore only When the position value in signal makes signal voltage comparator that should be overturn in signal receiving point, due to interference do not occur overturning just have by Interference effect.

Signal receiving end is arranged：Signal receiving end is by twin voltage comparator, High-speed Control switch and signal voltage comparator It constitutes, grid cyclic wave connects after electric resistance partial pressure with twin voltage comparator input terminal, and the setting of twin voltage comparator is rationed the power supply by wealthy family The low-voltage window region that the threshold range of pressure and low threshold voltage is constituted.Under microcontroller control, when all wave voltages of input It falls in the low-voltage window region that twin voltage comparator is arranged, makes High-speed Control switch in an ON state, signal voltage compares Device directly receives position in the signal of all wave voltages and receives signal and measurement cycle time parameter, whether determines received signal In the signal receiving point error range of setting, High-speed Control switch is made to be off state other than low-voltage window region.Cause This, grid cyclic wave voltage is switched through High-speed Control and is controlled, only directly conditioned in two low-voltage window regions of cycle positive half cycle Filtering is followed by signal voltage comparator input terminal, filters out High-frequency Interference by fundamental frequency signal re-demodulation signal of communication, every From grid cyclic wave high voltage, reduce by the error caused by bleeder circuit.Low-voltage window region is arranged in twin voltage comparator When, it need to ensure that the first signal location and second signal position are fallen always in the low-voltage window region.

The erasing and repeating transmission of position value in signal：During transmitting terminal sends signal, opened when high-speed power controls switch Afterwards, the signal transmitted by transmitting terminal simultaneously receiving end signal voltage comparator receive, if receive position value information with The position value information of transmission is different, then then sends the erasing signal of this.Each data bit is erasable in each frame information Retransmit, using control bit receive and dispatch erasing signal, if wipe twice in succession it is unsuccessful, that is, send erasing frame signal, to carry High signal recall rate.Only when the quantity for being wiped free of position is more than setting value, just wipe and retransmission of information frame.

Information frame generates：System is the communication of two machines or principal and subordinate's multi-computer communication, is allocated in advance when for principal and subordinate's multi-computer communication Synchronization time is used in the communication of each machine, and setting section synchronization time can communicate one or many, communicate multiple information frames every time, synchronous Period timing terminates, and synchrotimer resets and restarts timing.

Institute's rheme is binary digit.Each information frame is made of start bit, data bit, stop bits.Start bit and end Position is per bit occupancy a cycle, data bit totally 8, per two periods of bit occupancy.Position value is with signal voltage comparator in signal Receiving point does not overturn to send position signal " 0 ", overturns to send position signal " 1 ".Microcontroller records effective during transmitting-receiving Data bits and the occupied digit of erase process, wherein valid data digit show that data bit passes when reaching 8 digit of setting Send end.When first signal set point of each data bit sends position signal " 1 " or " 0 ", position signal " 1 " that second round sends or " 0 " is with the period 1 on the contrary, its two kinds are combined " 1 ", " 0 " and " 0 ", " 1 " as two different values of position signal.Second round Second signal set point is the data for confirming or wiping the first signal set point and send, and it is to confirm to send " 1 ", and transmission " 0 " is to wipe It removes.It is to start to send that signal voltage comparator sends " 0 " in the first signal set point in start bit, and stop bits is set in the first signal Fixed point is terminated with sending " 1 ", and the second signal set point of start bit and stop bits does not have to.

The compensation of signal transmitting and receiving site error：China's sinusoidal ac mains frequency be 50Hz, voltage effective value 220V, Its instantaneous voltage u is calculated by following formula：

U=Umsin100 π t；………………………………….1

In formula：U_mFor China's network voltage peak value

As shown in Figure 1, system is crossed at 0 using the voltage of cycle positive half cycle ascent stage as start time to the first signal set point Time interval be nominal value T_m1；The voltage of cycle positive half cycle ascent stage is crossed at 0 as start time to second signal set point Time interval is nominal value T_m2.The T_m1And T_m2It is calculated by 1 formula, u is all wave voltages of setting in formula.

Simultaneously measured 0 voltage comparator the cycle positive half cycle ascent stage mistake 0 overturn when time arrived for start time The real-time measurement values T of time interval of the signal voltage comparator when the first signal location is overturn_c1；This spent for 0 flip-flop transition when being Between time interval of the starting point to signal voltage comparator when second signal position is overturn real-time measurement values T_c2；Signal voltage ratio It was arrived between time of 0 voltage comparator when the mistake 0 of cycle positive half cycle descending branch is overturn compared with device when second signal position is overturn Every real-time measurement values T_c3；Cross 0 voltage comparator the cycle positive half cycle ascent stage of two adjacent cycles mistake 0 overturn when Between between be divided into cycle period real-time measurement values Tzu.

Since power grid crosses the left and right shake that 0 error showed as at 0 point, but sending and receiving end synchronized 0 and to cross 0 overturning as base Locating tab assembly cycle time parameter, cross 0 shake influences very little to measuring cycle time parameter, therefore ignores 0 voltage comparator and cross 0 Overturning and timing error.When the cycle detected and its adjacent two cycles are true, the cycle period being detected simultaneously by is real When measured value Tzu in 20ms and its error range, measure the cycle with cross 0 voltage comparator in the cycle positive half cycle ascent stage The a reference value T of time interval when crossing 0 overturning for start time to signal voltage comparator when the first signal location is overturn_c01 The a reference value that 0 overturning is time interval of the start time to signal voltage comparator when second signal position is overturn is crossed with this T_c02, preserve the continuous T of a setting number in 30 to 50_c01And T_c02And calculate preserved T_c01Average value T_p1With protected The T deposited_c02Average value T_p2, by T_p1And T_p2It is stored in corresponding storage unit.

The then error compensation value T of signal voltage comparator flip-flop transition_bIt is determined by following formula：

T_b={ (T_m2-T_m1)-(T_p2-T_p1)}÷2；………………2

By T_bIt preserves.T_bIllustrate that the position of actual signal transmitting-receiving point is higher for timing.

Measurement described above, wherein T_c1Or T_c01It is to cross 0 voltage comparator and signal voltage comparator in cycle just half Week crossed on the basis of the flip-flop transition of 0 position and signal location, but practical measure is after being interrupted with voltage comparator overturning triggering On the basis of the timing time of timer, in this way, having served as triggering after mistake 0 of 0 voltage comparator in the cycle positive half cycle ascent stage is overturn The process for interrupting and starting timer, there are time for each instructions, it need to be added in the timing time of the measurement；Meanwhile institute The triggering after the overturning of the first signal location need to be subtracted and interrupt and read the instruction of process of timer and hold by stating the timing time of measurement The row time.The execution time for an instruction for also needing to be carrying out comprising microcontroller after overturning is interrupted in triggering after wherein overturning, It can postpone interruption, and microcontroller STC15F2K60S is the microcontroller of 1T, this is easy to obtain the instruction time.Second Signal location measures T_c2Or T_c02Similarly, T is measured_c3When be also similar to above.

The judgement of the cycle true and false：By T_c1With T_p1；T_c2With T_p2；Tzu makes comparisons respectively with 20ms, if respectively fair at it Perhaps in cycle error range, then the cycle signal detected is true, otherwise there is more overproof a, cycle detected Signal is false.Not in communication period and in the T of communication period_c1With T_p1；T_c2With T_p2Difference is respectively set when making comparisons respectively Cycle error range, since the first signal location of communication period and second signal position are shifted, and larger cycle is taken to miss Poor range.

Clock timer and synchrotimer is arranged in system, and wherein synchrotimer preserves each cycle period and counted with 20ms The cycle period aggregate-value of calculation is as synchronization time.When above-mentioned judgement cycle signal is true, preserves Tzu and take 20ms and synchronometer When device timing time be added, the value that will add up restores in synchrotimer, will be all if the cycle signal detected is false Compared with wave signal is multiplied by with 20ms as the product of cycle during the vacation for timing time during the vacation, if in error range, It takes 20ms to be multiplied by and is added with synchrotimer timing time for the product of cycle during the vacation, when detecting that cycle signal is again The time synchronisation time is accurately corrected when true, and it is timing time and synchrotimer timing during the vacation otherwise to use cycle signal Time is added.It is ± 0.1Hz when generally running, when the relative error since power system frequency deviation allowable value is 0.2Hz When more than 6ms, illustrate that power grid has occurred compared with major break down.

The synchronization of signal transmitting and receiving：Communication is realized in the case where controlling synchronization time.Communication transmits multiple information frames each time, often At the beginning of secondary communication use synchronization time, be it is preset or by Centralized Controller instruct arrange, according to power grid quality and letter Number structure needs the data bit occupancy in each frame information 1 to multiple setting byte numbers, and power grid quality takes well larger set Determine byte number.The clock timer time there are two cycle period is stayed after each frame traffic, for updating T_c1、T_c2And T_c3。 The communication of next frame since next cycle retransmits the information frame if detecting that cycle signal is false in a frame traffic.

Realize that the cycle in communication sequentially synchronizes by the start bit of each frame information, stop bits in the sending and receiving end of the communication information It connects.Centralized Controller or intelligent display station board measure and store T respectively in the call duration time gap of described two frames_c1、T_c2 And T_c3, and calculate separately two real-time measurement values T_c1Average value T_k1、T_c2Average value T_k2And T_c3Average value T_k3, and respectively It is stored in two groups of storage units, i.e. T_c1、T_c2And T_c3Storage unit and T_k1、T_k2And T_k3Storage unit is taken out when from storage unit T_k1、T_k2And T_k3After reset two groups of storage units.The storage unit can store 16 real-time measurement values T_c1、T_c2And T_c3.Do not exist Communication period measures continuous 16 real-time measurement values T respectively_c1、T_c2And T_c3If it is false to screen to cycle signal, reset The T_c1、T_c2And T_c3Respective storage unit, continue to measure when it to cycle signal is true to screen and storage, often be deposited when being filled with Enter a T_c1、T_c2And T_c3, first remove a T being stored at first_c1、T_c2And T_c3, while being taken out by a setting in 2 to 15 Number takes out the T of last one group of deposit_c1、T_c2And T_c3, the smaller setting taking-up number of choosing when power grid quality difference, calculating is taken out every One group of T_c1Average value T_k1、T_c2Average value T_k2And T_c3Average value T_k3And replace the T originally preserved_k1、T_k2And T_k3, adopt With average value T_k1、T_k2And T_k3Reduce the influence of network voltage and frequency fluctuation.

Send the determination of signal time：Communication is implemented in single-phase phase line in a transformer platform area of power grid, And it makes an appointment by the synchrotimer time and starts call duration time.Holding with address information is first broadcasted by Centralized Controller when communication Hand signal, when Centralized Controller requires some intelligent display station board to Centralized Controller feedback information, the intelligent display station board Just information is sent to Centralized Controller.Centralized Controller or intelligent display station board receive and dispatch letter in the communication synchronization time made an appointment Before breath, it is necessary to screen out continuous no less than 16 grid cyclic waves, i.e., measure in storage unit in real time and have no less than 16 A T_c1、T_c2And T_c3If continuous 16 T are not detected_c1、T_c2And T_c3It is then sequentially delayed until detecting that 16 are Only.Transmitting terminal takes out T from storage unit_k1、T_k2And T_k3Value respectively add T_b, it is real to obtain the first signal with error compensation Border transmitting-receiving point T_d1With the practical sending point T of second signal_d2：

Td1=Tk1-Tb；……………………………………3

Td₂=Tk₂+Tb；……………………………………4

The practical receiving point T of second signal with error compensation_d3：

Td3=Tk3-Tb；………………………………………5

Preserve T_d1、T_d2And T_d3In respective storage unit.Send T after each frame information_k1、T_k2And T_k3All it is updated.

When sending signal, microcontroller uses T respectively_d1And T_d2As switching signal timer timing midpoint and according to Used rectangular wave broad pulse voltage levels take certain offset, then using the spaced time of rectangular wave broad pulse as switch The timing length of signal timing device is easy to calculate high-speed power control switch ON time point, that is, is used for T_d1Point sends rectangle The setting sending time T of wave broad pulse_f1And T_d2The setting sending time T of the rectangular wave broad pulse of point_f2：

T_f1=T_d1-(T_m/2)-T_an；………………………………6

T_f2=T_d2-(T_m/2)-T_an；………………………………7

T in formula_mFor signal rectangular wave broad pulse width, T_anFor the offset.

In the cycle positive half cycle ascent stage, since rectangular wave broad pulse loads on the initial stage of cycle positive half cycle, the wide arteries and veins of rectangular wave Rush that the voltage more therefore transmitted rectangular wave broad pulses high relative to all wave voltages are more powerful, the signal of generation receives Point displacement is more, sets turnover voltage in the other time segment signal voltage comparator of loading procedure, has been moved off signal reception The voltage location of point；Cycle positive half cycle descending branch is then that the signal of the latter stage generation of all wave processes is loaded in rectangular wave broad pulse Receiving point displacement is more, in this way, the switching signal according to the tests determined transmitting terminal of rectangular wave broad pulse voltage actually used The point midway and T of timer time_d1Or T_d2Between offset T_an, so that signal is received more reliable.

Signal transmission process：Transmitting terminal is crossed the overturning of 0 voltage comparator in cycle positive half cycle ascent stage cycle and was generated in 0 It is disconnected, through the T that is delayed_i1Or T_i2Afterwards, firing switch signal timing device and connect high-speed power control switch, single rectangular wave is wide Pulse voltage is superimposed on grid cyclic wave, makes fundamental frequency in T_d1Or T_d2Voltage generate small displacement on a timeline, and Certain harmonic wave can be injected to system.

If crossing interrupt handling routine after 0 interruption, starting measurement T_c1Timer with connect switching signal timer instruction The execution time is Tin

When to T_d1When sending signal：

Ti=Tf1-Tin；…………………………………………8

When to T_d2When sending signal：

Ti2=Tf2-Tin.…………………………………………9

T_iAnd T_i2Value also adjusted in real time according to the displacement of the signaling point of receiving terminal is how many.

Switching signal timer timing overflow interrupt when in interrupt service routine closing high-speed power control switch, to Complete a signal modulation process.

In view of the decaying of signals transmission, and demodulation is using cycle voltage over zero as time reference, in this way For signal in Long Distant Transmit, the cycle voltage phase difference of sending and receiving end can cause setting to receive signal time position and actual signal Occur deviation between time location and shadow communication performance, therefore when not taking the method for eliminating deviation, communication distance is limited System is in same transformer platform area.

The demodulation of signal：Signal voltage comparator of the receiving terminal when receiving signal measures in real time in the first signal location T_c1Subtract T_bRear value and the T being finally stored in is taken out from memory_c1Previous T_c1Subtract T_bValue afterwards make comparisons whether Within the scope of the signal errors of permission, determine that the first signal location receives position value in signal；Signal voltage comparator is second The T that signal location measures in real time_c3Subtract T_bRear value and the T being finally stored in is taken out from memory_c3Previous T_c3Subtract T_b Whether value afterwards makes comparisons within the scope of the signal errors of permission, determines that second signal position receives position value in signal.

The control of signal transmitting power：When transmitting terminal switching signal timer fires and connect high-speed power control switch Afterwards, the external interrupt mouth of microcontroller opening signal receiving terminal immediately, detection signal voltage comparator is in cycle positive half cycle first The flip-flop transition of signal location and second signal position, with T_d1And T_d3It compares and whether shifts and its shift amount, if signal is electric Press comparator flip-flop transition closer to T_d1, illustrate to send rectangular wave broad pulse energy is relatively smaller or electric network impedance relatively It is low.If signal voltage comparator flip-flop transition is closer to T_d1, then increase T_iTime, if rectangular wave broad pulse voltage comparator Flip-flop transition is closer to T_d2Then reduce T_i2Time.

(4) it illustrates：

Fig. 1 is grid cyclic wave receiving and transmitting signal position data relation schematic diagram；

Fig. 2 is a kind of circuit structure block diagram of the radio communication station board system of bus station.

(5) specific implementation mode：

A kind of circuit structure block diagram of the radio communication station board system of bus station is as shown in Figure 2.By Centralized Controller and Multiple intelligent display station boards are constituted.Centralized Controller is shown by signal sending end A, signal receiving end B, 4G wireless router 2, keyboard Show that module 10 and micro controller module 1 are constituted.Intelligent display station board is by signal sending end A, signal receiving end B and nRF905 radio frequency Communication module 1 is constituted.Radio communication is used between intelligent display station board and Vehicle Controller 11.Centralized Controller and intelligent display Station board uses the power line communication.Master station is the computer management system positioned at top layer by 4G wireless routers, microcontroller Device module and computer are constituted.

The signal sending end A, signal receiving end B of power line communication described in Centralized Controller and intelligent display station board and micro- Controller module 1 is identical with the hardware configuration of power module 4.

The signal sending end A of the power line communication is made of high-speed power control switch 5, switching signal timer 3, electricity Net voltage is connected to high-speed power control output switching terminal.

The signal receiving end B of the power line communication is compared by twin voltage comparator 7, High-speed Control switch 6,0 voltage excessively Device 8 and signal voltage comparator 9 are constituted.Grid cyclic wave connects after electric resistance partial pressure with 7 input terminal of twin voltage comparator, crosses 0 electricity Pressure comparator 8 and signal voltage comparator 9 are all made of ns grades of high speed voltage comparator MAX319.

Micro controller module 1 uses High Speed Microcontroller STC15F2K60S, this is a kind of single clock/machine cycle (1T) Microcontroller, speed ratio STC12 also fast 20% is high speed/low-power consumption/superpower jamproof 8051 microcontroller of new generation, no AD Conversion.

The single-phase firewire and zero curve of power grid connect the output port of signal sending end and the input port of receiving terminal, wherein power grid Zero line grounding end.The window region network voltage control is in 55V voltage ranges, machine shell protective grounding, and has high electricity The security warning of pressure area, it is 1 that trouble hunting, which should install no-load voltage ratio additional,：1 isolating transformer is avoided because of failure accidental shock.

2 model F3836 of 4G wireless routers, can also select other model routers.F3836 is industrial built in one kind Grade 32 bit processors and technical grade wireless module provide 1 RS232 (or RS485/ using embedded real-time operating system RS422) 4 ethernet lans, 1 Ethernet WAN and 1 WIFI interface, can connect WIFI equipment, ethernet device simultaneously Data transparent transmission and routing function are realized with serial equipment.

Claims (10)

1. the data of a kind of implementation method of the radio communication station board system of bus station, the acquisition of intelligent display station board pass through power line It is uploaded to Centralized Controller, Centralized Controller accesses mobile radio communication network by wireless router, it is characterised in that：

The power line communication of use is by the accurate of the signal sending point of the setting to grid cyclic wave voltage and signal receiving point Positioning, setting signal sending point send communication positive or negative pole a rectangle broad pulse to generate mutation current, The electric current causes a voltage drop to be superimposed on grid voltage waveform on the short-circuit impedance of distribution transformer, primary to complete Signal modulation process, signal receiving point demodulated signal of the receiving terminal in the setting of grid cyclic wave voltage；One wide arteries and veins of anode Punching refers to that the high level part of pulse returns 0 from 0 to height.

2. according to the method described in claim 1, it is characterized in that, the signal sending point of the setting in grid cyclic wave voltage Modulating and demodulating signal step with the signal receiving point of setting includes：

It sends：When be arranged the cycle in the cycle positive half cycle ascent stage cross 0 voltage comparator overturning generated 0 interruption, after delay Its sending time is fallen in the signal sending point of the setting of all wave voltages, and firing switch signal timing device simultaneously connects high-speed power control Switch, by single positive pulse voltage Signal averaging on grid cyclic wave；

It receives：The low-voltage window being made of the threshold range of high threshold voltage and low threshold voltage being arranged by twin voltage comparator Mouth region, when all wave voltages of input are fallen in the low-voltage window region that twin voltage comparator is arranged, makes under microcontroller control High-speed Control switch in an ON state, signal voltage comparator directly the signal of all wave voltages receive position receive signal and Cycle time parameter is measured, received signal is determined whether in the signal receiving point error range of setting, in low-voltage window High-speed Control switch is set to be off state other than mouth region.

3. according to the method described in claim 2, it is characterized in that, the signal sending point and signal receiving point of setting are in power grid The voltage of cycle positive half cycle, which is crossed at 0, was arranged 0 voltage comparator, and one in grid cyclic wave positive half cycle sets cycle voltage location Setting signal voltage comparator, the output of signal voltage comparator is in two positions for setting all wave voltages of a cycle positive half cycle Set realization overturning；The cycle positive half cycle ascent stage the setting week wave voltage position as the first signal location, setting The cycle voltage location of signal transmitting and receiving point is known as the first signal set point, in the setting cycle electricity of cycle positive half cycle descending branch The position of pressure is known as second signal set point as second signal position, the cycle voltage location of setting signal transmitting-receiving point；

The signal voltage comparator is provided in a setting cycle between voltage 21V -40V of grid cyclic wave positive half cycle Voltage location.

4. according to the method described in claim 1, it is characterized in that, the distance that basis signal need to transmit when sending signal is through experiment It determines：

Rectangular wave broad pulse voltage-drop loading is set in the positive 35V of the signal sending point on grid cyclic wave to the voltage value between 60V； The rectangular wave broad pulse voltage is higher by value than the voltage for the grid cyclic wave position being loaded；The width value of rectangular wave broad pulse voltage For 0.3ms~0.5ms；Signal code value 1A -20A can be provided.

5. according to the method described in claim 1, it is characterized in that, the signal receiving point demodulated signal in setting, including Confirm or wipe the signal sent from the signal sending point of setting, during transmitting terminal sends signal, the letter transmitted by transmitting terminal Number simultaneously receiving end receive, if receive position value information it is different from the position value information of transmission, then send the position Erasing signal, each data bit is erasable in each frame information and retransmits.

6. according to the method described in claim 5, it is characterized in that, position value with signal voltage comparator signal receiving point not Overturning overturns to send position signal " 1 ", the first signal set point of each data bit sends position signal " 1 " to send position signal " 0 " Or when " 0 ", second round send position signal " 1 " or " 0 " with the period 1 on the contrary, its two kinds are combined " 1 ", " 0 " and " 0 ", " 1 " As two different values of position signal, the second signal set point of second round is to confirm or wipe the first signal set point to send Data, it is to confirm to send " 1 ", and it is erasing to send " 0 ", and signal voltage comparator is sent in the first signal set point in start bit " 0 " is to start to send, and stop bits is terminated in the first signal set point with sending " 1 ", and the second signal of start bit and stop bits is set Fixed point does not have to.

7. according to the method described in claim 1, it is characterized in that, the signal sending point of setting and the accurate of signal receiving point are determined Position includes the error compensation of set signal sending point and signal receiving point, while crossing 0 voltage comparator and signal voltage ratio It is all made of ns grades of high speed voltage comparators and High Speed Microcontroller compared with device.

8. according to claim 1 and method of claim 7, which is characterized in that signal sending point and signal receiving point It is accurately positioned and its compensation method of error, to be first computing system crossed at 0 using the voltage of cycle positive half cycle ascent stage as the time O'clock to the first signal set point time interval be nominal value T_m1；It is start time that the voltage of cycle positive half cycle ascent stage, which is crossed at 0, Time interval to second signal set point is nominal value T_m2；

And time of 0 voltage comparator when the mistake 0 of cycle positive half cycle ascent stage overturns was measured as start time to signal electricity Press the real-time measurement values T of time interval of the comparator when the first signal location is overturn_c1；This spent for 0 flip-flop transition as start time To the real-time measurement values T of time interval of the signal voltage comparator when second signal position is overturn_c2；Signal voltage comparator exists The reality of time interval of 0 voltage comparator when the mistake 0 of cycle positive half cycle descending branch is overturn was arrived in second signal position when overturning When measured value T_c3；Cross time interval of 0 voltage comparator when the mistake 0 of the cycle positive half cycle ascent stage of two adjacent cycles is overturn For cycle period real-time measurement values Tzu；

When the cycle detected and its adjacent two cycles are true, the cycle period real-time measurement values Tzu being detected simultaneously by In 20ms and its error range, measure the cycle to cross 0 voltage comparator is when the mistake 0 of cycle positive half cycle ascent stage is overturn The a reference value T of time interval of the start time to signal voltage comparator when the first signal location is overturn_c010 overturning is crossed with this For a reference value T of time interval of the start time to signal voltage comparator when second signal position is overturn_c02, preserve 30 to The continuous T of a setting number in 50_c01And T_c02And calculate preserved T_c01Average value T_p1With the T preserved_c02It is flat Mean value T_p2, by T_p1And T_p2It is stored in corresponding storage unit；

The then error compensation value T of signal voltage comparator flip-flop transition_bIt is determined by following formula：

T_b={ (T_m2-T_m1)-(T_p2-T_p1)}÷2；

By T_bIt preserves, T_bIllustrate that the position of actual signal transmitting-receiving point is higher for timing；

The extremely multiple setting byte number of the data bit occupancy in each frame information 1 is needed according to power grid quality and signal structure, The clock timer time there are two cycle period is stayed after each frame traffic, for updating T_c1、T_c2And T_c3, from next week Wave starts the communication of next frame, if detecting that cycle signal is false in a frame traffic, retransmits the information frame；

It realizes that the cycle in communication sequentially synchronizes by the start bit of each frame information, stop bits and connects in the sending and receiving end of the communication information Continuous, Centralized Controller or intelligent display station board measure and store T respectively in the call duration time gap of described two frames_c1、T_c2With T_c3, and calculate separately two real-time measurement values T_c1Average value T_k1、T_c2Average value T_k2And T_c3Average value T_k3, and deposit respectively Enter two groups of storage units, i.e. T_c1、T_c2And T_c3Storage unit and T_k1、T_k2And T_k3Storage unit, when from storage unit take out T_k1、 T_k2And T_k3After reset two groups of storage units, the storage unit can store 16 real-time measurement values T_c1、T_c2And T_c3, do not communicating Period measures continuous 16 real-time measurement values T respectively_c1、T_c2And T_c3If it is false to screen to cycle signal, described in clearing T_c1、T_c2And T_c3Respective storage unit, continue to measure when it to cycle signal is true to screen and storage, one be often stored in when being filled with A T_c1、T_c2And T_c3, first remove a T being stored at first_c1、T_c2And T_c3, while number is taken out by a setting in 2 to 15, Take out the T of last one group of deposit_c1、T_c2And T_c3, the smaller setting taking-up number of choosing when power grid quality difference, calculating is taken out each The T of group_c1Average value T_k1、T_c2Average value T_k2And T_c3Average value T_k3And replace the T originally preserved_k1、T_k2And T_k3；

Send the determination of signal time：Continuous no less than 16 grid cyclic waves must be screened out before receiving and sending messages, i.e., in fact When measure and have no less than 16 T in storage unit_c1、T_c2And T_c3If continuous 16 T are not detected_c1、T_c2And T_c3 It is then sequentially delayed until detecting 16, transmitting terminal takes out T from storage unit_k1、T_k2And T_k3Value respectively add T_b, Obtain the practical transmitting-receiving point T of the first signal with error compensation_d1With the practical sending point T of second signal_d2：

T_d1=T_k1-T_b；

T_d2=T_k2+T_b；

The practical receiving point T of second signal with error compensation_d3：

T_d3=T_k3-T_b；

Preserve T_d1、T_d2And T_d3In respective storage unit, T after each frame information is sent_k1、T_k2And T_k3All it is updated；

When sending signal, microcontroller uses T respectively_d1And T_d2As switching signal timer timing midpoint and according to being used Rectangular wave broad pulse voltage levels take certain offset, then determined using the spaced time of rectangular wave broad pulse as switching signal When device timing length, be easy to calculate high-speed power control switch ON time point, that is, be used for T_d1Point sends the wide arteries and veins of rectangular wave The setting sending time T of punching_f1And T_d2The setting sending time T of the rectangular wave broad pulse of point_f2：

T_f1=T_d1-(T_m/2)-T_an；

T_f2=T_d2-(T_m/2)-T_an；

T in formula_mFor signal rectangular wave broad pulse width, T_anFor the offset；

Rectangular wave broad pulse loads on the initial stage of cycle positive half cycle, and rectangular wave broad pulse voltage is high more relative to all wave voltages More, the signal receiving point displacement of generation is more, and cycle positive half cycle descending branch is then to load on all wave processes in rectangular wave broad pulse The signal receiving point displacement that generates of latter stage it is more, the point midway of the switching signal timer time of tests determined transmitting terminal With T_d1Or T_d2Between offset T_an；

Signal transmission process：Grid cyclic wave voltage is connected to high-speed power control output switching terminal mouth, when the cycle positive half cycle ascent stage Cycle cross 0 voltage comparator overturning generated 0 interruption, through be delayed T_i1Or T_i2Afterwards, firing switch signal timing device and height is connected Fast power control switch makes fundamental frequency in T by single positive pulse voltage Signal averaging on grid cyclic wave_d1Or T_d2Electricity Pressure generates small displacement on a timeline；

If crossing interrupt handling routine after 0 interruption, starting measurement T_c1Timer with connect switching signal timer instruction execution Time is Tin

When to T_d1When sending signal：

T_i=T_f1-Tin；

When to T_d2When sending signal：

T_i2=T_f2-Tin；

T_iAnd T_i2Value also adjusted in real time according to the displacement of the signaling point of receiving terminal is how many；

Switching signal timer timing overflow interrupt when in interrupt service routine closing high-speed power control switch, to complete Signal modulation process；

Above-mentioned T_i2Value also adjusted in real time according to the displacement of the signaling point of receiving terminal is how many, methods are：If signal voltage compares Device flip-flop transition is closer to T_d1, then the control of microcontroller control high-speed power, which switchs, increases rectangular wave broad pulse voltage, if letter Number voltage comparator flip-flop transition is closer to T_d2Then reduce T_i2Time.

9. a kind of device of the radio communication station board system of bus station, it is characterised in that including,

Signal sending end, signal receiving end and the microcontroller of power line communication described in Centralized Controller and intelligent display station board The hardware configuration of module is identical；

The signal sending end of the power line communication is made of high-speed power control switch, switching signal timer；

The signal receiving end of the power line communication is switched by twin voltage comparator, High-speed Control, crosses 0 voltage comparator and signal Voltage comparator is constituted.

10. device according to claim 9, it is characterised in that the signal receiving end of the power line communication is by power grid All wave voltages through High-speed Control switch control, cycle positive half cycle two low-voltage window regions directly it is conditioned filtering be followed by Signal voltage comparator input terminal, low-voltage window region of the High-speed Control switch only around signal transmitting and receiving point are opened, isolation Grid cyclic wave high voltage, signal voltage comparator is directly when the signal of all wave voltages receives position and receives signal and measure cycle Between parameter；

The signal sending end of the power line communication, network voltage are connected to high-speed power control output switching terminal, in cycle just half All ascent stage cycles cross the overturning of 0 voltage comparator and generated 0 interruption, through the T that is delayed_i1Or T_i2Afterwards, firing switch signal timing device is simultaneously High-speed power control switch is connected, by single rectangular wave broad pulse voltage superposition on grid cyclic wave.