CN104659930B - Radio energy receiving equipment and the method for adaptive frequency - Google Patents
Radio energy receiving equipment and the method for adaptive frequency Download PDFInfo
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- CN104659930B CN104659930B CN201410397198.1A CN201410397198A CN104659930B CN 104659930 B CN104659930 B CN 104659930B CN 201410397198 A CN201410397198 A CN 201410397198A CN 104659930 B CN104659930 B CN 104659930B
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Abstract
The invention provides a kind of radio energy receiving equipment and method, comprising: receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations; Energy testing apparatus detects the electric current on this receiving terminal LC resonant network and current value is exported to feedback control circuit; Feedback control circuit transmits control signal to self-adapting resonance adjusting device according to the variation of current value, and self-adapting resonance adjusting device receives the intrinsic frequency that regulates described receiving terminal LC resonant network after this control signal; Feedback control circuit continues according to the current value result of variations after regulating, and controls the intrinsic frequency of self-adapting resonance adjusting device adjusting receiving terminal LC resonant network, until the current value on LC resonant network maximizes; Energy acquisition output circuit is exported after the current acquisition in described LC resonant network is processed. Can receive adaptively the electromagnetic energy of radio energy emitter transmitting by the present invention.
Description
Technical field
The present invention relates to wireless power transmission technology, refer to that especially a kind of radio energy of adaptive frequency connectsReceiving unit and method.
Background technology
China is greatly developing in intelligent grid technology, the equipment on transmission tower of the being arranged on electricity of not workingSource, traditional way is to adopt the combination of solar energy pole plate and battery that equipment working power is provided, thisThe later maintenance cost of planting power supply mode is higher. And ultra-high-tension power transmission line induction power taking technology is that equipotential is gotElectricity, provides working power can to work equipment on the line. But be operated in equipment on shaft tower stillSo there is no working power, if by wire by electrical energy transfer to shaft tower, be equal to the high potential of transmission line of electricityWith earth potential short circuit, can not implement.
Wireless power transmission (WirelessPowerTransmission, WPT), i.e. wireless transmission of electricity be byA kind of new technique that carries out energy transmission in electromagnetic field or electromagnetic wave. Along with scientific and technological development, traditionalPower transmission mode is difficult to meet its power demands. Therefore, the importance of development wireless power transmission technology day by dayHighlight.
Existing wireless transmission of electricity is broadly divided into: induction, electromagnetic radiation formula and electromagentic resonance formula.Induction transmission range is near, efficiency is low. Energy transmission between the rotor of generator, motorUtilize exactly this principle, transmission range is grade. Electromagnetic radiation formula long transmission distance, but if completeDirectional emission, the efficiency of electric energy transmitting can be very low; And if directed radiation, have pay no attention to disconnectedVisual orientation and very complicated tracking instrument and equipment, its development difficulty is very large. Electromagentic resonance formula, mainUtilizing magnet coupled resonant type delivery of energy technology, is the breakthrough to induction type, in theory can be at the model of several metersEnclose the interior high efficiency energy transmission that realizes, make a breakthrough will change people's power mode once technical, it shouldWith having a extensive future.
Magnet coupled resonant type delivery of energy technical thought is carried in 2006 by the Massachusetts Institute of Technology (MIT) the earliestGo out, and obtained preliminary experimental verification in 2007, it is assorted that experimental result has been published in " Science "Will. On this technological essence, rely on magnetic field transferring energy, it,, by the coupling in magnetic field between resonance coil, is borrowedHelp and transmit and receive the resonance that coil produces and realize the wireless transmission of energy. Technique in theory can beThe energy of meter level Distance Transmission relatively high power has the non-magnetic of passing through barrier, to relative position simultaneouslyRequire the lower outstanding advantages of Denging.
The basic implementation of this technology is mainly, at transmitting terminal, delivery of energy power supply, drive circuit and transmitting are setCircuit; At receiving terminal, receiving circuit and mu balanced circuit etc. are set. Wherein radiating circuit is generally by the line of departureThe LC oscillation circuit of circle and electric capacity composition, the LC that receiving circuit is made up of receiving coil and electric capacity vibratesLoop. Provide lasting energy to export by delivery of energy power supply to transmitting coil, produce and drive letter by drive circuitNumber stimulated emission coil resonance, produces alternating magnetic field. Action of alternating magnetic field, in receiving coil, makes to receive lineCircle produces resonance, and because receiving coil is identical with transmitting coil frequency, therefore the two produces resonance, therebyBy the Energy Transfer of delivery of energy power supply to receiving coil.
Shown in Figure 1, be the structure of a kind of typical implementation of the prior art. Comprise direct currentSource, on-off circuit, radiating circuit, booster, five parts of resonance receiving circuit. Wherein, direct currentSource, on-off circuit and radiating circuit are connected in series, and by on-off circuit, drive driving of signal as producingMoving circuit, gauge tap pipe T turns on and off, thereby obtains the high frequency side of stimulated emission circuit resonanceWave voltage, makes the LC loop of radiating circuit produce the higher-order of oscillation; The LC loop of receiving circuit produces with frequentlyResonance, receives the energy that radiating circuit is launched.
At present the Research Challenges of this technology is: in order to improve efficiency of transmission and transmission range, make itReaching can application level, all frequency of oscillation of an urgent demand raising radiating circuit. But want so on the one handAsk the LC oscillation circuit frequency that improves radiating circuit, also require drive circuit generation to match simultaneouslyHigh-frequency driving signal, and require the LC loop in this driving signal and radiating circuit under high-frequency to shakeSwing frequency and keep Complete Synchronization. After general way is the natural mode shape of Accurate Measurement radiating circuit,The occurrence frequency that drives signal is set again, and in the time that equipment is worked, also needs to regulate this driving signal frequencySynchronize with LC recirculating loop frequency. But along with the raising of transmitting coil frequency of oscillation, gauge tap pipe T selfThe switching frequency that determines of device and be difficult to opportunity regulate, be therefore difficult to realize accurate control, cannot makeCoil all vibrates in resonant frequency at any time.
The switching frequency of gauge tap pipe T also will reach the frequency of oscillation of radiating circuit, to gauge tapLoss is also very large.
The resonant frequency of receiving circuit also must be consistent with the tranmitting frequency of radiating circuit, therefore no matter to sending outRay circle or the processing technology of receiving coil require all higher.
And along with the change of the external environment condition such as temperature, humidity, discrete inductance parameter is also becoming thereuponChange, and due to radio energy-transmitting device discrete parameter complexity, coil is easily subject to peripheral circuit and disturbs, and makesBecome frequency drift. And prior art drives the frequency adaptively modifying thereupon of signal, thus willHave a strong impact on reliability and the efficiency of wireless energy transfer. Thereby special in engineering to wireless technology of transmission of electricityNot that the practical application of high voltage power transmission field and popularization have caused very large obstacle. All the time neither one scheme at presentHead it off well.
Summary of the invention
In view of this, the object of the invention is to propose a kind of radio energy receiving equipment of adaptive frequencyAnd method, to solve the difficult problems such as conventional wireless passes energy scheme high frequency control difficulty, and adaptivity is poor.
Based on above-mentioned purpose radio energy receiving equipment provided by the invention, comprising: receiving terminal LC resonanceNetwork, energy testing apparatus, feedback control circuit, self-adapting resonance adjusting device, energy acquisition outputCircuit;
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations; InstituteState energy testing apparatus and comprise punching current transformer and rectifying and voltage-stabilizing module; The induction of punching current transformerElectric current in receiving terminal LC resonant network, exports induced-current to rectifying and voltage-stabilizing module rectifying and voltage-stabilizingAfter, current value is exported to feedback control circuit; Feedback control circuit according to the variation of current value to adaptiveAnswer resonance adjusting device to transmit control signal, self-adapting resonance adjusting device is adjusted after receiving this control signalSave the intrinsic frequency of described receiving terminal LC resonant network; Feedback control circuit continues according to the electricity after regulatingFlow valuve result of variations, control self-adapting resonance adjusting device regulates the intrinsic frequency of receiving terminal LC resonant networkRate, until the current value on LC resonant network maximizes;
Energy acquisition output circuit is exported after the current acquisition in described LC resonant network is processed.
Optionally, in this receiving equipment, described energy testing apparatus comprises: punching current transformer and wholeStream Voltage stabilizing module; Described feedback control circuit is MCU; Described self-adapting resonance adjusting device comprises motorDriver module, motor and with receiving terminal LC resonant network in the tunable capacitor of withstand voltage Capacitance parallel connection;
After described rectifying and voltage-stabilizing module rectifying and voltage-stabilizing, input to the AD module in MCU; MCU is according to tuneBefore and after joint, the variation of current value, sends conditioning signal to motor drive module; Motor drive module control electricityMachine regulates the capacitance of described tunable capacitor.
Optionally, in this receiving equipment, described energy acquisition output circuit comprises: matching network, rectificationVoltage stabilizing module, charging control circuit, battery;
The output of receiving terminal LC resonant network is connected to described matching network, and matching network is used for making to connectThe internal resistance of receiving end LC resonant network is mated with receiving terminal equivalent load impedance, and by the electricity on LC resonant networkStream exports rectifying and voltage-stabilizing module to; Export respectively battery and negative to through rectifying and voltage-stabilizing electric current after treatmentCarry, described battery powers to the load simultaneously;
Described charging control circuit detects battery both end voltage, when magnitude of voltage is during lower than predetermined threshold, fillsElectric control circuit is opened to charge in batteries, and continues to detect battery both end voltage; When magnitude of voltage reachesWhen the full piezoelectric voltage value of battery, charging control circuit stops to charge in batteries.
Optionally, in this receiving equipment, between described mu balanced circuit and load and charging control circuit andBetween load, be connected with respectively the diode for anti-backflow.
Optionally, in this receiving equipment, described self-adapting resonance adjusting device regulates described receiving terminal LCThe process of the intrinsic frequency of resonant network comprises:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step.
In another aspect of this invention, also provide a kind of radio energy method of reseptance of adaptive frequency,Comprise:
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations;
Detect electric current on this receiving terminal LC resonant network and by current value;
Regulate the intrinsic frequency of described receiving terminal LC resonant network according to the variation of current value;
According to the current value result of variations after regulating, regulate the intrinsic frequency of receiving terminal LC resonant network,Until the current value on LC resonant network maximizes;
Output after current acquisition in described LC resonant network is processed.
Optionally, the method is by regulating the capacitance on receiving terminal LC resonant network to regulate described solidThere is frequency.
Optionally, the mode of the method employing dichotomy progressively regulates described receiving terminal LC resonant networkIntrinsic frequency, until the current value on LC resonant network maximizes.
Optionally, described in the method, regulate the process of the intrinsic frequency of receiving terminal LC resonant network to comprise:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step. As can be seen from above, the nothing of adaptive frequency provided by the inventionLine electric energy receiving equipment and method, do not adopt outside driving signal to control the vibration of radiating circuit,But broken through original thoughtcast, utilize LC loop intrinsic frequency in radiating circuit to realize energy biographyDefeated. No longer be concerned about and drive the frequency of signal whether can keep consistent and synchronous with the frequency of radiating circuit,And whether the energy of only paying close attention in radiating circuit reaches transmission requirement. Pass through adaptive side at receiving terminalFormula, makes receiving circuit frequency remain consistent with the frequency of radiating circuit. Thereby realize well energyAmount transmission, has effectively improved efficiency of transmission. The solution of the present invention is had the following advantages:
1, equipment dependability and adaptivity effectively promote, and the circuit topological structure of transmitting terminal is simple, does not needProduce the drive circuit that drives signal, avoided as realizing driving signal frequency and radiating circuit frequency oneCause and synchronous complex control. In addition,, because control procedure is simple, frequency self-adaption is all used basic circuitBuild, logic is simple, there is no software programming, has promoted reliability and reaction speed, can realize high-frequencyUnder self-control, have stronger adaptive ability. Particularly when using in ultra-high-tension power transmission line power takingTime, because transmitter closes on high voltage transmission line, its electromagnetic radiation is very strong, easily transmitter is causedDisturb, produce frequency drift, even damage the control chip in transmitter, transmitting terminal of the present invention due toTopological structure is simple and can not need chip to realize to control, therefore effective lifting means reliability.
2, efficiency of transmission significantly improves, and the present invention utilizes radiating circuit directly to form frequency-selective network, makes systemThe concussion forever of concussion frequency, in the resonant frequency of radiating circuit, has solved radiating circuit medium frequency coupling and has askedTopic. And by receiving circuit being taked to self adaptation regulative mode, make receiving circuit also be operated in resonance frequentlyIn rate, even if the factors such as external environment condition cause tranmitting frequency to change, receiving terminal also can be realized frequently wellRate coupling, remains synchronously transmitting terminal and receiving terminal, produces resonance effects, thereby efficiency of transmission is aobviousWork improves. In addition, in the present invention, transmitting terminal, due to the restriction without being activated signal control circuit, is sent outThe frequency of oscillation of penetrating signal can significantly improve, and high-frequency can effectively be avoided energy in electron waves transmitting procedureAmount dissipates, and can effectively improve the efficiency of radio energy-transmitting and pass can distance. Generally, the present invention is notNeed booster, can realize effective transmission of wireless energy.
3, the security of equipment, practicality are high, greatly reduce costs. Contrary compared with traditional many switch DCsPower transformation road is controlled, and because batch (-type) of the present invention passes energy, in the present invention, the switching frequency of transmitting terminal is brightAobvious minimizing, switching frequency is well below frequency of oscillation, effectively avoided causing because switching frequency is too highSome row difficult problems, as driven chip difficulty to look for, seldom have the MOS of megahertz rank to drive chip; RightMetal-oxide-semiconductor rising edge and trailing edge time delay have high requirement, if resonant frequency is 1M hertz, switchRise and fall along time to be controlled in 50ns; Under high frequency situations, the economize on electricity of switch self is held, between wireMutual inductance cannot ignore, actual fabrication difficulty is very large etc. In addition, because the present invention program is to transmittingSelf frequency of circuit and receiving circuit, all less than very high required precision, makes transmitting coil and receiving coilProcessing technology become simply, greatly reduced production cost.
Wireless power transmission systems of the present invention is through Practical on-site test, reliability, energy transfer efficiency and biography energy distanceFrom all apparently higher than prior art, make this technology depart from laboratory stage, reach the water of practical applicationFlat. Utilize radio energy transmission system of the present invention, can convert electrical energy into electromagnetic transmission energy, inBetween by air insulation, can effectively avoid short circuit problem. Get the necks such as energy, wireless charging at high voltage transmission lineTerritory is with a wide range of applications.
Brief description of the drawings
Fig. 1 is prior art magnet coupled resonant type delivery of energy radio energy transmission system structural representation;
Fig. 2 is the structural representation of embodiment of the present invention magnet coupled resonant type wireless electric energy transmission system;
Fig. 3 is the structured flowchart of embodiment of the present invention magnet coupled resonant type wireless delivery of electrical energy transmitter;
Fig. 4 is the structural representation of a specific embodiment of transmitter of the present invention;
Fig. 5 is the structured flowchart of embodiment of the present invention magnet coupled resonant type wireless delivery of electrical energy receiving equipment;
Fig. 6 is the structural representation of a specific embodiment of receiving equipment of the present invention;
Fig. 7 is the Adaptive matching control flow chart of embodiment of the present invention receiving equipment;
Fig. 8 is the application schematic diagram of embodiment of the present invention radio energy transmission system on high voltage transmission line.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete enforcementExample, and with reference to accompanying drawing, the present invention is described in more detail.
As one embodiment of the present of invention, radio energy receiving equipment mainly comprises: receiving terminal LC is humorousVibrating network, energy testing apparatus, feedback control circuit, self-adapting resonance adjusting device, energy acquisition are defeatedGo out circuit;
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations; EnergyAmount detecting device detects the electric current on this receiving terminal LC resonant network and current value is exported to FEEDBACK CONTROLCircuit; Feedback control circuit sends and controls letter to self-adapting resonance adjusting device according to the variation of current valueNumber, self-adapting resonance adjusting device regulates described receiving terminal LC resonant network after receiving this control signalIntrinsic frequency; Feedback control circuit continues, according to the current value result of variations after regulating, to control self adaptationResonance adjusting device regulates the intrinsic frequency of receiving terminal LC resonant network, until the electricity on LC resonant networkFlow valuve maximizes;
Energy acquisition output circuit is exported after the current acquisition in described LC resonant network is processed.
The structure of an embodiment of radio energy receiving equipment provided by the invention is shown in Figure 5, bagDraw together: receiving terminal LC resonant network 501, energy testing apparatus 502, feedback control circuit 504, adaptiveAnswer resonance adjusting device 503, energy acquisition output circuit;
Receiving terminal LC resonant network 501 receives the next electromagnetic wave of transmitter transmission and produces resonance and shakesSwing, energy testing apparatus 502 detects electric current on this receiving terminal LC resonant networks 501 and by current valueExport to feedback control circuit 504, feedback control circuit 504 is humorous to self adaptation according to the variation of current valueThe adjusting device of shaking 503 transmits control signal, and self-adapting resonance adjusting device 503 regulates described receiving terminal LCThe intrinsic frequency of resonant network 501, so that the current value maximum on receiving terminal LC resonant network 501Change; After energy acquisition output circuit is processed the current acquisition in described receiving terminal LC resonant network 501Output.
As an embodiment, described energy acquisition output circuit comprises: matching network 602, rectificationVoltage stabilizing module 603, battery 605 and by electric loading 606.
The output of receiving terminal LC resonant network 501 is connected to described matching network 602, matching network602 for 501 internal resistances of receiving terminal LC resonant network are mated with receiving terminal equivalent load impedance, and willElectric current on LC resonant network 501 exports rectifying and voltage-stabilizing module to, for making receiving terminal LC resonant network501 internal resistances are mated with receiving terminal equivalent load impedance, so that the received energy of receiving terminal load maximizes.Optionally, described matching network 602 can be the LC formula matching network of L-type, T-shaped, π type etc.;Also can be other type matching networks such as transformer impedance translation circuit. Through rectifying and voltage-stabilizing electricity after treatmentStream exports respectively battery 605 and load 606 to, and described battery 605 also supplies to load 606 simultaneouslyElectricity.
As an embodiment, radio energy receiving equipment specifically can adopt structure as shown in Figure 7:
By being set, a tunable capacitor is connected in parallel on the withstand voltage electric capacity 610 of receiving terminal LC resonant network 501Upper, control this tunable capacitor by motor 611, thereby achieve a butt joint receiving end LC resonant network 501Self intrinsic frequency tuning.
Particularly, described energy testing apparatus 502 comprises: punching current transformer 612 and rectifying and voltage-stabilizingModule 607.
Described feedback control circuit 504 mainly comprises a control chip MCU608.
Described self-adapting resonance adjusting device 503 comprise motor drive module 609, motor 611 and withThe tunable capacitor of withstand voltage electric capacity 610 parallel connections in receiving terminal LC resonant network 501.
Punching current transformer 612 is responded to the electric current in receiving terminal LC resonant network 501, by induced electricityStream exports rectifying and voltage-stabilizing module 607 to, and (modulus turns after rectifying and voltage-stabilizing, to input to AD in MCU608Change) module; MCU, according to the variation of current value before and after capacitance adjustment, sends conditioning signal to motor and drivesModule 609; Motor drive module 609 is controlled motor 611 and is rotated the electric capacity that regulates described tunable capacitorValue. As an embodiment, described motor 611 can be asynchronous machine, regulates adjustable electric by rotationThe capacitance of holding.
Described energy acquisition output circuit comprises: matching network 602, rectifying and voltage-stabilizing module 603, charging controlCircuit 604 processed, battery 605.
The output of receiving terminal LC resonant network 501 is connected to described matching network 602, matching network602 mate with receiving terminal equivalent load impedance for the internal resistance that makes receiving terminal LC resonant network 501, and willElectric current on LC resonant network 501 exports rectifying and voltage-stabilizing module to; Divide through rectifying and voltage-stabilizing electric current after treatmentDo not export battery 605 and load 606 to, described battery 605 is powered to load 606 simultaneously.
Described charging control circuit 604 detects battery 605 both end voltage, when magnitude of voltage is lower than predetermined thresholdWhen value, charging control circuit 604 is opened to battery 605 and is charged, and continues to detect 605 liang, batteryTerminal voltage; When magnitude of voltage reaches battery 605, completely piezoelectric voltage value (can be by presetting a maximumThreshold value realizes this deterministic process) time, charging control circuit 604 stops charging to battery 605.
In addition, optional, between described mu balanced circuit 603 and load 606 and charging control circuit604 and load 606 between be connected with respectively the diode for anti-backflow.
Certainly, it will be recognized by those skilled in the art that be above a kind of specific embodiment of the present invention and, can also realize by other means the capacitance tuning on receiving terminal LC resonant network 501, exampleAs: can directly adopt high pressure tunable capacitor as the withstand voltage electricity on receiving terminal LC resonant network 501Hold, like this without a tunable capacitor in parallel, and directly regulate withstand voltage on this LC resonant network 501Electric capacity; For tunable capacitor in parallel, or high pressure on receiving terminal LC resonant network 501 canAdjust electric capacity, by the mode of motor tuning capacitance value, also can take other modes except above-mentionedRealize capacitance tuning.
In order to compare peak value as far as possible, regulate the intrinsic frequency of described receiving terminal LC resonant network to adoptDichotomy, if described energy testing apparatus detects that the current value on LC receiving tank increasesTrend take a turn for the worse, the adjusting value of inductance is next time reduced by half, until the LC detecting receivesThere is peak-peak in the current wave on oscillation circuit. This dichotomy mode can be used separately, also can be withThe described regulated quantity of described each increase or minimizing is that the mode of a small value is combined with above, existsIn embodiment, if detecting the current value on LC receiving tank, described energy testing apparatus increases aboveWhen the trend adding takes a turn for the worse, further adopt dichotomy, the adjusting value of inductance is reduced by half at every turn, fromAnd can carry out accurate peak value location.
In addition,, as an embodiment, described self-adapting resonance adjusting device regulates described receiving terminal LCThe intrinsic frequency of resonant network can realize by following tuning process:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step.
Shown in Figure 7, the MCU Self Adaptive Control flow process of one embodiment of the invention comprises following stepRapid:
Step 701, device power initializes;
Step 702, detects the current value of current collection, i.e. AD value be stored as D1;
Step 703, judges whether D1 equals 0, and if so, the abnormal work of transmitting terminal is described, connectsReceiving end does not produce induced oscillation, returns to step 702 and continues to detect AD value; If not, enter step704；
Step 704, increases a pre-set fixed value Δ C by capacitance; In this step, can lead toCrossing motor regulates described tunable capacitor to realize;
Step 705, the current AD value after Detection capacitance increases, and be stored as D2;
Step 706, judges whether D2-D1 is greater than 0, if the adjusting direction that current capacitance is described justReally, enter step 707; Otherwise enter step 709;
Step 707, continues capacitance to increase a Δ C;
Step 708, detects current AD value, and is stored as D2, enters step 713;
Step 713, judges whether D2-D1 is greater than 0, and if so, current D2 is set to D1 and returnsStep 707, continues forward and increases capacitance; Otherwise current D2 is set to D1 and enters step714；
Step 714, reduces a Δ C by current capacitance and temporarily settles out current electric capacity to adjustHumorous, storing current current value is D1, enters step 715;
The object of this step is, through the judgement of step 713, after the electric capacity of step 707 is adjusted, rightThe tuning of receiving terminal LC resonant network should exceed maximum summit, therefore needs reverse readjustmentA Δ C. Certainly because after the electric capacity of step 707 is adjusted, in fact receiving terminal LC resonant networkBe near maximum summit, therefore also can have removed this step, or by the whole electric capacity of readjustmentValue is set to a fixed value less than Δ C.
Step 709, reduces a Δ C by capacitance;
Step 710, detects the value of AD and is stored as D2;
Step 711, judges that whether D2-D1 is greater than 0, if current D2 is set to D1, returnsStep 709; Otherwise, current D2 is arranged to D1 and enters step 712;
Step 712, increases current capacitance a Δ C and temporarily settles out current electric capacity and adjustHumorous, storing current current value is D1, enters step 715;
The object of this step is, through the judgement of step 710, after the electric capacity of step 709 is adjusted, rightThe tuning of receiving terminal LC resonant network should exceed maximum summit, therefore needs reverse readjustmentA Δ C. Certainly because after the electric capacity of step 707 is adjusted, in fact receiving terminal LC resonant networkBe near maximum summit, therefore also can have removed this step, or by the whole electric capacity of readjustmentValue is set to a fixed value less than Δ C.
Step 715, detects the value of current AD and is stored as D2;
Step 716, judges that D2 and D1 differ a predetermined percentage that whether exceedes D1, for example10%, if so, explanation has produced serious deviation, returns to step 2 and re-starts tuning; If not,Return to step 715.
In another aspect of this invention, also provide a kind of radio energy method of reseptance of adaptive frequency,Mainly comprise as an embodiment the method:
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations;
Detect electric current on this receiving terminal LC resonant network and by current value;
Regulate the intrinsic frequency of described receiving terminal LC resonant network according to the variation of current value;
According to the current value result of variations after regulating, regulate the intrinsic frequency of receiving terminal LC resonant network,Until the current value on LC resonant network maximizes;
Output after current acquisition in described LC resonant network is processed.
In the method, can be by regulating the capacitance on receiving terminal LC resonant network to regulate described solidThere is frequency.
Equally, can adopt the mode of dichotomy progressively to regulate the intrinsic of described receiving terminal LC resonant networkFrequency, until the current value on LC resonant network maximizes.
In addition, the intrinsic frequency of described adjusting receiving terminal LC resonant network also can take following process realExisting c:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step.
Shown in Figure 2, be magnetic coupling resonance radio energy receiving equipment and transmitting in the embodiment of the present inventionThe electric energy transmission system that equipment forms. Specific as follows:
In transmitter, include transmitting terminal LC resonant network, energy supply power supply and self-resonance control electricityRoad; Energy supply power supply is to the LC resonant network charging of transmitting terminal, and self-resonance control circuit is complete in chargingAfter, disconnect the power supply of energy supply power supply; The self-resonance under self intrinsic frequency of transmitting terminal LC resonant network is shakenSwing, and by the resonance coil in this transmitting terminal LC resonant network, energy is transmitted with electromagnetic formGo out;
In receiving equipment, include receiving terminal LC resonant network and self adaptation regulating circuit; Receiving terminal LCThe resonance coil of resonant network is responded to described electromagnetic wave and is produced resonance oscillations; Described self adaptation regulating circuitBy regulating the intrinsic frequency of this receiving terminal LC resonant network, make this receiving terminal LC resonant network with described inThe LC resonant network of transmitting terminal produces resonance.
In addition, described transmitting terminal LC resonant network under self intrinsic frequency in self-resonance oscillatory process,Self-resonance control circuit detects when in transmitting terminal LC resonant network, energy is lower than predetermined threshold, closed confessionElectricity power supply starts to described transmitting terminal LC resonant network charging.
The structure of an embodiment of radio energy transmitter provided by the invention is shown in Figure 3, bagDraw together: dc source 401, the transmitting terminal LC resonant network 402 being formed by transmitting coil and Capacitance parallel connection,Transmitting terminal current sensing means 303, emission control module 302, emission switch module 408;
Described dc source 401, emission switch module 408 and 402 series connection of transmitting terminal LC resonant network connectConnect; Described transmitting terminal current sensing means 303 is for detection of the electricity on transmitting terminal LC resonant network 402Stream is also transferred to emission control module 302 by the current value detecting; Described emission control module 302 useIn controlling, emission switch disconnects or closure;
After emission switch module 408 closures, dc source 401 starts to described transmitting terminal LC Resonance Neural NetworkNetwork 402 charges, when transmitting terminal current sensing means 303 detects that current value is higher than predetermined electric current maximumWhen value, emission control module 302 is controlled emission switch module 408 and is disconnected, and makes transmitting terminal LC Resonance Neural NetworkNetwork 402 starts self-oscillation and to unofficial biography energy; Described in described transmitting terminal current sensing means 303 detectsCurrent value on transmitting terminal LC resonant network 402 is during lower than predetermined current minimum, emission control mouldPiece 302 is controlled emission switch module 408 closures.
Wherein, describedly described transmitting terminal LC resonance detected when described transmitting terminal current sensing means 303Current value on network 402 is during lower than predetermined current minimum, in order to protect emission switch module408, can also further detect whether zero crossing of electric current, in the time of current zero-crossing point, emission control module302 control emission switch module 408 closures.
As an embodiment, described dc source 401 is induction type electricity getting device, for defeated from high pressureOn electric wire, induction obtains energy rectifying and wave-filtering formation galvanic current potential source.
This induction type electricity getting device comprises gets energy coil, rectifying and wave-filtering, power taking power adjusting, charging and voltage stabilizingCircuit, lithium battery group, the both positive and negative polarity output of charging and voltage stabilizing circuit is connected to described transmitting terminal LCResonant network 402 and emission switch module 408. Thus, induction electricity getting device is by feeling on high voltage transmission lineShould obtain energy, convert stable voltage source to through current rectifying and wave filtering circuit, be the wireless energy of batch (-type) resonanceThe radiating portion energy supply of amount transmitting device. And batch (-type) resonance wireless energy transform device will be responded to power taking dressPut the energy obtained from high voltage transmission line in the mode of electromagnetic induction by the wireless energy shaft tower that is transmitted back to, giveEquipment energy supply on shaft tower.
Shown in Figure 4, as an embodiment, described transmitting terminal current sensing means 303 comprises:Punching current transformer 409, rectification filtering module 403, current maxima comparator 404, electric current minimumValue comparator 405 and voltage zero-crossing comparator 407, wherein voltage zero-crossing comparator 407 is by detectingDescribed switch module 408 both end voltage are poor judges whether zero crossing of electric current. Described control module is that RS touchesHair device 406.
Punching current transformer 409 induced emission end LC resonant network 402 current oscillations, the sense of generationInduced current is transferred to rectification filtering module 403, is transferred to current maxima comparison after rectifying and wave-filtering simultaneouslyDevice 404 and current minimum comparator 405, current maxima comparator 404 judges that current value exceedes in advanceWhen fixed lowest high-current value, to described rest-set flip-flop 406 transmitted signals, rest-set flip-flop 406 receivesAfter this signal, be trigger switch module 408, now switch module 408 is in closure, therefore switch module408 disconnect after receiving the triggering signal of rest-set flip-flop 406. Current minimum comparator 405 judgement electricityFlow valuve is during lower than predetermined minimum of a value, to described voltage zero-crossing comparator 407 transmitted signals, trigger voltageZero-crossing comparator 407 detects and the voltage difference at more described switch module 408 two ends, if described switchModule 408 both end voltage are poor reaches zero, and this voltage zero-crossing comparator is to 406 of described rest-set flip-flopsThe number of delivering letters, rest-set flip-flop 406 trigger switch modules 408, now switch module 408 is in off-state(because therefore the internal resistance of switch module 408 is giving under LC resonant network 402 charged states, this switchThe voltage difference at module 408 two ends can not be zero), therefore receive after the triggering signal of rest-set flip-flop 406Switch module 408 closures, dc source 401 starts to charge for LC resonant network 402.
Content can be found out from above, and the scheme circuit topological structure of the embodiment of the present invention is simple, peaceIt is convenient to fill, and through-put power is large, and efficiency is high, has very strong adaptive ability. Straight compared with traditional many switchesStream inverter circuit control, has reduced switching loss, and has only had a switch control, promoted security andPracticality, has reduced engineering cost greatly. And because batch (-type) passes energy, switching frequency far awayLower than frequency of oscillation, that has effectively avoided causing because switching frequency is too high comprises: HF switch, controlChip, LC resonant network etc. are in interior a series of difficult problems. Utilize transmitting coil directly to form frequency-selective network,Make the concussion forever of system concussion frequency in resonant frequency, maximizing efficiency. Its frequency self-adaption is all used baseThis circuit is built, and logic is simple, there is no software programming, has promoted reliability and reaction speed, can realizeSelf-control under high-frequency, has stronger adaptive ability.
In the present invention, because transmitting terminal LC resonant network and receiving terminal LC resonant network frequency have fineMatching, in the time that equipment is installed, the receiving coil in transmitting coil and receiving terminal LC resonant networkAxis not necessarily requires to overlap completely point-blank. Certainly in order to ensure preferably magnetic coupling, excellentSelect the as far as possible unsuitable deviation of transmitting coil and receiving coil axis too many; If transmitting coil and receiving coil itBetween distance at 2～5 meters, the angle of the relative transmitting coil axis of receiving coil axis can ± 30 ° withIn. In addition, the two axis of transmitting coil and receiving coil also can be parallel but be staggered necessarily compared with narrow spacingFrom, the distance that staggers does not exceed 2 times of transmitting coil diameters, is all generally acceptable.
The technology of the present invention radio energy-transmitting efficiency is high, and device structure is simple, and the technique that passes energy coil is not had yetToo high request. By current experiment, as long as coil is arranged a little, can realize within the scope of 2～5 metersWireless energy transfer, efficiency of transmission can reach 40%. Therefore application of the present invention is very extensive,Can be for the radio energy-transmitting on power line, also can be for the radio energy-transmitting of various needs, wireless defeatedThe scenes such as electricity, wireless charging.
Fig. 8 is the concrete application implementation of of radio energy transmission system of the present invention. Nothing of the present inventionThe transmitter of line electric energy is arranged on the tower bar of power line, by induction type electricity getting device, defeated from high pressureOn electric wire, induction obtains energy rectifying and wave-filtering formation galvanic current potential source, gives transmitting terminal LC resonanceNetwork power supply. Transmitting terminal LC resonant network vibrates by self intrinsic frequency, electric energy is turned batch (-type)Be changed to electromagnetic wave outside transmission. Receiving terminal LC resonant network in receiving equipment senses this electromagnetic waveAfter, start vibration thereupon, humorous by the self-adapting tuning circuit tuning receiving terminal LC of receiving equipment insideThe intrinsic frequency of vibrating network, produces altogether the LC resonant network of receiving terminal LC resonant network and transmitting terminalShakes, realize magnetic coupling with this, thereby the energy that transmitting terminal LC resonant network is launched receives,Realize the demand such as power supplied locally and stored energy. Due to the insulation characterisitic of air, this radio energy-transmitting modeCan effectively avoid the short circuit problem in high pressure power taking process. Get energy, wireless charging etc. at high voltage transmission lineField is with a wide range of applications.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiments of the inventionOnly, be not limited to the present invention, within the spirit and principles in the present invention all, any repairing of doingProtection scope of the present invention changes, be equal to replacement, improvement etc., within all should be included in.
Claims (9)
1. a radio energy receiving equipment, is characterized in that, comprising: receiving terminal LC resonant network,Energy testing apparatus, feedback control circuit, self-adapting resonance adjusting device, energy acquisition output circuit;
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations; InstituteState energy testing apparatus and comprise punching current transformer and rectifying and voltage-stabilizing module; The induction of punching current transformerElectric current in receiving terminal LC resonant network, exports induced-current to rectifying and voltage-stabilizing module rectifying and voltage-stabilizingAfter, current value is exported to feedback control circuit; Feedback control circuit according to the variation of current value to adaptiveAnswer resonance adjusting device to transmit control signal, self-adapting resonance adjusting device is adjusted after receiving this control signalSave the intrinsic frequency of described receiving terminal LC resonant network; Feedback control circuit continues according to the electricity after regulatingFlow valuve result of variations, control self-adapting resonance adjusting device regulates the intrinsic frequency of receiving terminal LC resonant networkRate, until the current value on LC resonant network maximizes;
Energy acquisition output circuit is exported after the current acquisition in described LC resonant network is processed.
2. receiving equipment according to claim 1, is characterized in that, described feedback control circuit isMCU; Described self-adapting resonance adjusting device comprise motor drive module, motor and with receiving terminal LCThe tunable capacitor of the withstand voltage Capacitance parallel connection in resonant network;
After described rectifying and voltage-stabilizing module rectifying and voltage-stabilizing, input to the AD module in MCU; MCU is according to tuneBefore and after joint, the variation of current value, sends conditioning signal to motor drive module; Motor drive module control electricityMachine regulates the capacitance of described tunable capacitor.
3. receiving equipment according to claim 1, is characterized in that, described energy acquisition output electricityRoad comprises: matching network, rectifying and voltage-stabilizing module, charging control circuit, battery;
The output of receiving terminal LC resonant network is connected to described matching network, and matching network is used for making to connectThe internal resistance of receiving end LC resonant network is mated with receiving terminal equivalent load impedance, and by the electricity on LC resonant networkStream exports rectifying and voltage-stabilizing module to; Export respectively battery and negative to through rectifying and voltage-stabilizing electric current after treatmentCarry, described battery powers to the load simultaneously;
Described charging control circuit detects battery both end voltage, when magnitude of voltage is during lower than predetermined threshold, fillsElectric control circuit is opened to charge in batteries, and continues to detect battery both end voltage; When magnitude of voltage reachesWhen the full piezoelectric voltage value of battery, charging control circuit stops to charge in batteries.
4. receiving equipment according to claim 3, is characterized in that, described mu balanced circuit and loadBetween and between charging control circuit and load, be connected with respectively the diode for anti-backflow.
5. receiving equipment according to claim 1, is characterized in that, described self-adapting resonance regulatesDevice regulates the process of the intrinsic frequency of described receiving terminal LC resonant network to comprise:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step.
6. a radio energy method of reseptance for adaptive frequency, is characterized in that, comprising:
Receiving terminal LC resonant network receives the next electromagnetic wave of transmitter transmission and produces resonance oscillations;
By the electric current in punching current transformer induction receiving terminal LC resonant network;
Regulate the intrinsic frequency of described receiving terminal LC resonant network according to the variation of current value;
According to the current value result of variations after regulating, regulate the intrinsic frequency of receiving terminal LC resonant network,Until the current value on LC resonant network maximizes;
Output after current acquisition in described LC resonant network is processed.
7. method according to claim 6, is characterized in that, by regulating receiving terminal LC Resonance Neural NetworkCapacitance on network regulates described intrinsic frequency.
8. method according to claim 7, is characterized in that, adopts the mode of dichotomy progressively to regulateThe intrinsic frequency of described receiving terminal LC resonant network, until the current value on LC resonant network maximizes.
9. method according to claim 7, is characterized in that described adjusting receiving terminal LC Resonance Neural NetworkThe process of the intrinsic frequency of network comprises:
After power-up initializing, detect the current value on receiving terminal LC resonant network, determine whether zero,If so, return and continue to detect; If not zero regulates the capacitance on receiving terminal LC resonant network to increaseA little Δ C adds deduct;
Judge whether the current value after capacitance adjustment is greater than the current value before adjusting, if continue equidirectionalIncrease or reduce a Δ C, otherwise increase or reduce a Δ C in the other direction;
The trend increasing along electric current continues increase or reduce a Δ C, until electric current increase tendency detectedReverse; , to after a Δ C of current capacitance readjustment, lock this capacitance, and record current thisLarge current value;
Continue to detect the current value of receiving terminal LC resonant network, if current current value is in the maximum of recordCurrent value and exceed setting threshold, returns to the current value detecting on receiving terminal LC resonant network, judgementIt is whether zero initial step.
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| US10284018B2 (en) * | 2015-10-30 | 2019-05-07 | Shenzhen Yichong Wirless Power Technology Co. Ltd | System, apparatus and method for adaptive tuning for wireless power transfer |
| CN105490395A (en) * | 2015-11-30 | 2016-04-13 | 无锡华润矽科微电子有限公司 | Automatically detuned receiving terminal in wireless charging and energy adjusting method |
| CN106300699A (en) * | 2016-09-18 | 2017-01-04 | 青岛海信电器股份有限公司 | Wireless charging receiver, wireless charging system and charge control method thereof |
| CN106405332A (en) * | 2016-09-26 | 2017-02-15 | 武汉大学 | Continuous operation performance testing method for magnetic resonance type wireless energy transmission system |
| CN106602744A (en) * | 2017-01-13 | 2017-04-26 | 山西潞安环保能源开发股份有限公司王庄煤矿 | Miniwatt middle-distance magnetic coupling wireless power transmission apparatus and tuning method thereof |
| CN107093883B (en) * | 2017-06-27 | 2020-12-25 | 青岛鲁渝能源科技有限公司 | Protection circuit, wireless power transmission system and overcurrent/short-circuit protection method |
| EP3346579A1 (en) | 2017-11-03 | 2018-07-11 | Hilti Aktiengesellschaft | Resonant circuit for energy transfer |
| EP3346580A1 (en) * | 2017-11-03 | 2018-07-11 | Hilti Aktiengesellschaft | Resonant oscillating circuit for the transmission of electrical energy without power amplifier |
| CN108282030A (en) * | 2018-01-29 | 2018-07-13 | 重庆理工大学 | A kind of adaptive wireless charging method and device |
| CN111756119A (en) | 2019-03-27 | 2020-10-09 | 北京小米移动软件有限公司 | Method and device for improving wireless charging efficiency and electronic equipment |
| CN110033643A (en) * | 2019-04-20 | 2019-07-19 | 南京信息工程大学 | Roadside parking position monitoring instruction device and its control method |
| CN111355289B (en) * | 2020-04-16 | 2022-05-31 | 吉林大学 | Wireless charging constant current transmitting system for mobile phone |
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