CN208386253U - A kind of multifrequency multi-load wireless charging platform with load isolation characteristic - Google Patents
A kind of multifrequency multi-load wireless charging platform with load isolation characteristic Download PDFInfo
- Publication number
- CN208386253U CN208386253U CN201820751218.4U CN201820751218U CN208386253U CN 208386253 U CN208386253 U CN 208386253U CN 201820751218 U CN201820751218 U CN 201820751218U CN 208386253 U CN208386253 U CN 208386253U
- Authority
- CN
- China
- Prior art keywords
- load
- coil
- frequency
- receiver
- current source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 11
- 238000012546 transfer Methods 0.000 description 5
- 238000006880 cross-coupling reaction Methods 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
A kind of multifrequency multi-load wireless charging platform with load isolation characteristic, is made of the receiver of ac current source, transmitting coil, LC multifrequency tuning network and multiple and different working frequencies；Ac current source can produce the alternating current containing N number of different frequency component；Transmitting coil uses helmholtz coil structure, and the coil for the same size for being equal to coil radius by two coaxial placements and centre distance forms；LC multifrequency tuning network includes N number of parallel arm capacitor and N-1 series arm inductance；Receiver is made of receiving coil, tuning capacitance, load；Ac converter current source, transmitting coil L1, LC multifrequency tuning network be serially connected composition source emitting portion；Receiver can be placed in any position of charging platform when work.The utility model structure is simple, is easy to implement, can support the radio energy receiver of multiple and different working frequencies while charge, mutually isolated between each receiver, does not interfere with each other.
Description
Technical field
The utility model belongs to wireless power transmission technical field.
Background technique
Wireless power transmission technology is convenient because it is clean, safe advantage and by favor.Currently, wireless power transmission
Technical field has formed multiple technical standards such as Qi, PMA, A4WP, SAE, PT61980, however follows the radio of these standards
Energy Transmission system is usually operated at single-frequency, and its working frequency and disunity, such as: Qi working frequency range is 110-
205kHz, PMA working frequency range are that 110-300kHz, A4WP working frequency range are that ± 15 kHz, SAE working frequency range of 6.78Mhz is
81.38-90kHz.The radio energy charging platform of current existing one working frequency can only be for identical with its working frequency
Receiver charges, and can not charge to the receiver of multiple and different working frequencies.In order to solve this problem, document " Kim
Y,Ha D,Chappell W J,et al.Selective Wireless Power Transfer for Smart Power
Distribution in a Miniature-Sized Multiple-Receiver System[J]. IEEE
Transactions on Industrial Electronics, 2016,63 (3): 1853-1862 " is according to the maximum Q value of coil
The principle interfered with the relationship and minimum frequency of frequency has selected three optimal working frequency points, with Switching power at times
Frequency realizes load isolation and power distribution to the mode of three load supplyings, but cannot give multiple and different working frequencies simultaneously
Load supplying；Document " Beppu A, Katsura S.Analysis of dual-mode wireless power transfer
with two frequencies[C].Industrial Electronics Society,IECON 2016-,Conference
Of the IEEE.IEEE, 2016:4487-4492. " are by increasing matched coil to receiver to meet connecing for different frequency
It receives, but multiple and different working frequency load supplyings can not be given simultaneously；In document " Zhong W, Hui S Y R.
Auxiliary Circuits for Power Flow Control in Multi-frequency Wireless Power
Transfer Systems With Multiple Receivers[J].IEEE Transactions on Power
2015,30 (10): Electronics by increasing auxiliary circuit to receiver in 5902-5910 ", enables it to reception two
The electric energy of a different frequency, but presence interferes with each other the charging load on receiver each other；Document " Li Lin, Li Ran two-band
Magnet coupled resonant type wireless electric energy transmission system specificity analysis and experimental verification [J] electrotechnics journal, 2017,32 (18):
90-97. " provides the transmission channel of two different frequencies to realize the synchronous transfer of electric energy and signal, according to single resonance frequency
The impedance operator of electric energy transmission coil propose the mentality of designing of dual-band radio electric energy transmission coil；Document " Wang
Guoxing, Wang Peijun,Tang Yina,et al.Analysis of dual band power and data
telemetry for biomedical implants[J].IEEE Transactions on Biomedical Circuits
And System, 2012,6 (3): 208-2015. " additionally constructs a set of natural resonance frequency different from electric energy in WPT system
The signal transmssion line circle of transmission coil, to realize two independent physical channels, since system includes two sets of independent coils, line
Cross-coupling between circle will bring the interference between two physical channels, while also be not easy to the miniaturization of system and device.Text
Offer " Kung M L, Lin K H.Enhanced analysis and design method of dual-band coil
module for near-field wireless power transfer systems[J].IEEE Transactions on
Microwave Theory and Techniques, 2015,63 (3): tool is constructed in 821-832. ", and there are two natural resonances
The single turn double frequency coil of frequency, and realize using two frequency range simultaneous transmission electric energy to improve efficiency, however for multiple negative
Interfering with each other between load or receiver does not consider.
Utility model content
The purpose of the utility model is to overcome current radio energy transmission systems to be only operable on single-frequency, cannot be simultaneously
For the defect of a variety of different operating frequency receivers charging, a kind of multifrequency multi-load wireless charging of magnet coupled resonant type is proposed
Platform can be used for simultaneously to the receiver wireless charging of multiple and different working frequencies, and receiver load voltage is determined by current source,
Other frequencies are to its crosstalk very little in current source, and good isolation is kept between each receiver, are independent of each other.
The utility model is achieved through the following technical solutions.
A kind of multifrequency multi-load wireless charging platform with load isolation characteristic described in the utility model, by alternating current
Stream source, transmitting coil, LC multifrequency tuning network and multiple and different working frequencies receiver composition.
The ac current source is that can produce the ac current source containing N number of different frequency component, by AC-DC circuit,
Inverter circuit, FPGA control circuit are constituted.220V50/60Hz alternating current is powered after AC-DC is converted to inverter circuit；Inverter circuit
Using full-bridge current-mode inverter circuit, while by the control signal of FPGA programming output inverter switching tube, alternating current is obtained
The output current wave in stream source includes required each sinusoidal frequency components, and the angular frequency of each sinusoidal frequency components is by ascending time
Sequence arrangement is respectively ω1,ω2,…,ωN, the relationship of angular frequency and frequency meets ωi=2 π fi(i=1,2 ..., N), each sine
Frequency component current amplitude is respectively I1,I2,…,IN。
The transmitting coil uses helmholtz coil structure, is equal to coil half by two coaxial placements and centre distance
The coil of the same size of diameter forms, and the specific value of the inductance of transmitting coil can be determined by application demand.
The LC multifrequency tuning network is the stairstepping lumped LC match network an of single port, including N number of parallel arm
Capacitor and N-1 series arm inductance.
The receiver is made of receiving coil, tuning capacitance, load, and receiving coil passes through the magnetic coupling with transmitting coil
It closes resonance and picks up electric energy.
Ac converter current source, transmitting coil L1, LC multifrequency tuning network be serially connected composition source emitting portion.Work
When receiver can be placed in any position of charging platform.
The capacitor of LC multifrequency tuning network and the specific value of inductance can be by following scheme selections:
1) constructed fuction:
Parameter ω in denominator1,2,…,ωN-1,NMeet: ωi< ωi,i+1< ωi+1(i=1,2 ..., N-1), usually may be used
To takeOrOr
2) Z (s) is expanded into the continued fraction form of s, it may be assumed that
Utilize the extractable parallel arm capacitance C out of relation above1~CNWith series arm inductance value L2~LN。
J-th of reception resonator is by receiving end inductance coil LRj, tuning capacitance CRjWith load RRjIt is connected in series, j=1,
2,3,....Resonator j is tuned at ω1,ω2,…,ωNIn some frequencies omegaiOn, i.e.,ωi∈{ω1,
ω2,...,ωN}.Load presented in this frequency purely or it is approximate purely.For the mutual dry of limitation adjacent frequency
It disturbs, resonance angular frequency ωiReception resonator winding inductance quantity LRjIt should meet:
Min(ωiLRj|ωi+1/ωi-ωi/ωi+1|,ωiLRj|ωi/ωi-1-ωi-1/ωi|) > > RRj
Then load RRjBoth ends output voltage amplitude is | VRj|=ωiIiM1j, unrelated with load.
Charging platform structure disclosed by the utility model is simple, is easy to implement.The wireless charging platform can support it is multiple not
With working frequency radio energy receiver simultaneously charge, and each receiver load both end voltage amplitude and own load and
Other loads are unrelated thus mutually isolated between each receiver, do not interfere with each other.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model, (I1,f1)(I2,f2)…(IN,fN) it is that output includes multi-frequency point
The current source of amount, L1For emission inductance coil, C1、C2…CNFor the parallel arm capacitor of LC source multifrequency tuning network, L2、L2…
LNFor series arm inductance, LR1、LR1' it is resonance frequency f1Load-receipt coil, LR2、LR3... it be resonance frequency is f2、f3…fN
Load-receipt coil, CR1、CR1’、CR2、CR3... it is respective resonant capacitance, meetsRR1、RR1'、RR2、
RR3... for load, M11、M11'、M12、M13... it is each receiving coil LNWith transmitting coil L1Mutual inductance.
Fig. 2 is a kind of implementation example figure of double frequency multi-load wireless charging platform, and transmitting resonator inductor here uses the last of the twelve Earthly Branches
Mu Huozi coil.The present embodiment receiver selects working frequency f1=90kHz, f2=180kHz, wherein 90kHz work is in SAE
Standard wave band, 180kHz work in QI standard wave band.RR1、RR1’For resonance frequency f1Two receivers load, RR2Place connects
The resonance frequency of receipts machine is f2。
Fig. 3 be current source amplitude be 1A when, load RR1、RR2In 10ohm to 100ohm Standard resistance range, R is loadedR1’It opens
Lu Shi, RR1With frequency (kHz)-voltage amplitude curve graph of change in resistance, wherein (a) is RR1It is attached in resonance frequency 90kHz
Close voltage amplitude curve graph, is (b) RR1Voltage amplitude curve graph near frequency 180kHz.
Fig. 4 be current source amplitude be 1A when, load RR1、RR2In 10ohm to 100ohm Standard resistance range, R is loadedR1’It opens
Lu Shi, RR2With frequency (kHz)-voltage amplitude curve graph of change in resistance, wherein (a) is RR2It is attached in resonance frequency 180kHz
Close voltage amplitude curve graph (b) is voltage amplitude curve near frequency 90kHz.
Fig. 5 be current source amplitude be 1A when, load RR1、RR1‘ RR2In the presence of, load RR1、RR1’、RR210ohm extremely
In 100ohm Standard resistance range, RR1With frequency (kHz)-voltage amplitude curve graph of change in resistance, wherein (a) is RR1In resonance
Voltage amplitude curve graph near frequency 90kHz, is (b) RR1Voltage amplitude curve graph near frequency 180kHz.
Fig. 6 be current source amplitude be 1A when, load RR1、RR1‘ RR2In the presence of, load RR1、RR1’、RR210ohm extremely
In 100ohm Standard resistance range, RR1’With frequency (kHz)-voltage amplitude curve graph of change in resistance, wherein (a) is RR2Humorous
Voltage amplitude curve graph near vibration frequency 180kHz (b) is voltage amplitude curve near frequency 90kHz
Fig. 7 be current source amplitude be 1A when, load RR1、RR1‘ RR2In the presence of, load RR1、RR1’、RR210ohm extremely
In 100ohm Standard resistance range, RR2With frequency (kHz)-voltage amplitude curve graph of change in resistance, wherein (a) is RR2Humorous
Voltage amplitude curve graph near vibration frequency 180kHz (b) is voltage amplitude curve near frequency 90kHz.
Specific embodiment
The utility model will be described further in conjunction with attached drawing by specific embodiment, but it is practical new to should not be used as this
The limitation of type range and its application.
A kind of embodiment: multi-load wireless charging platform of two-frequency operation.
As shown in Fig. 2, the utility model platform is by generating two different frequency f1=90kHz, f2The alternating current of=180kHz
Stream source, LC source tuning circuit, transmit circuit, load-receipt circuit are constituted, RrFor the loss resistance R of receiving coilR1、RR2、
RR1’It is load resistance, M11、M12、M11’Mutual inductance between receiving coil and transmitting coil, the cross-coupling of receiving coil is herein
It ignores.Ac current source in embodiment is multiple by generating to FPGA programming Control full-bridge inverter switching tube
The current source of different frequency component, LC source tuning circuit are made of the T type lumped LC match network of a single port, transmitting
Circuit is made of Helmholtz source coupled inductor and source tuning capacitance, the magnetic field approaches uniformity around the coil point
Cloth.Receiving terminal circuit is made of load end coupled inductor and load end tuning capacitance.The charging platform realizes different frequency range
Electric energy emit while passing to the receiver of different frequency by the same source coil.
The physical circuit parameter of embodiment is as follows: f in the present embodiment1=90kHz, f2=180kHz, current source current amplitude
Value 1A, Helmholtz transmitting coil are connected in series by 2 air core coils at a distance of 15cm, bore (diameter) 30cm, (He Muhuo
Hereby two coil distances=radius) each air core coil forms by 12 circle of enamel covered wire coiling of linear diameter 1mm, total inductance L1=
180 μ H take C according to formula1=6.9nF, L2=500 μ H, C2=3.9nF.Load LR1、LR1’Wire gauge is identical, and bore is (straight
Diameter) it is 10cm, it is formed by 17 circle of enamel covered wire coiling of linear diameter 1mm, inductance is about LR1=LR1’=100 μ H, LR1、
LR1’Receiving coil connects a lumped inductance to improve its Q value, so that other interference of the frequency (i.e. 180kHz) to him are reduced,
Lumped inductance value takes 200 μ H；Load LR2Wire gauge is that bore (diameter) is 10cm, by the enamel covered wire coiling of linear diameter 1mm
10 circles form, and inductance is about LR2=60 μ H；Tuning capacitance CR1=CR1’=8nF, CR2=13nF is separately tuned to f1=
90kHz,f2=180kHz.The mutual inductance M of load and transmitting11=M11’=9 μ H, M12=5 μ H, load coupling coil are placed on relaying
On coil, to reduce the cross-coupling of each adjacent loading coil.
Fig. 3 to Fig. 7 give alternating current amplitude be 1A when, load frequency (kHz)-voltage amplitude in varied situations
Curve graph.
Fig. 3, Fig. 4 are that current source peak value is 1A, RR1‘When open circuit, R is loadedR1、RR2Resistance value is in 10ohm to 100ohm range
The frequency of interior scanning-voltage amplitude curve graph, as shown in (a) in Fig. 3, RR1Voltage peak-to-peak value reaches at resonance frequency 90kHz
To 10V.Frequency shown in (b) in Fig. 3 is R at 180kHzR1Voltage peak-to-peak value (is interfered lower than 0.6V caused by non-targeted frequency
Voltage).R shown in (b) in Fig. 4R2Frequency be 90kHz locate voltage peak-to-peak value be lower than 0.6V (interfered caused by non-targeted frequency
Voltage, frequency shown in (a) in Fig. 4 are R at 180kHzR2Voltage peak-to-peak value, which reaches, is up to 10V, it can be seen that is supported on each
From resonance frequency reach voltage magnitude maximum, and the voltage of resonance point and load resistance value it is unrelated, load resistance value difference when resonance
Point voltage magnitude is identical, and the interference voltage that non-targeted frequency current source is given is less than the 10% of operating voltage.
Fig. 5, Fig. 6, Fig. 7 are that current source peak value is 1A, RR1、RR1'、RR2In the presence of all, i.e. increase RR1'Load back loading RR1、
RR1'、RR2The frequency that resistance value scans within the scope of 10ohm to 100ohm-voltage amplitude curve graph.For example, in (a) in Fig. 5,
RR1It is that 90kHz locates voltage peak-to-peak value and reaches and be up to 10V in frequency, frequency is at 180kHz, RR1Voltage peak-to-peak value is lower than
0.6V (interference voltage caused by non-targeted frequency), as shown in (b) in Fig. 5.
In (a) in Fig. 6, RR1’It is that voltage peak-to-peak value reaches and is up to 10V at 90kHz in frequency, (b) in Fig. 6
Middle frequency is R at 180kHzR1’Voltage peak-to-peak value is lower than 0.6V (interference voltage caused by non-targeted frequency).Load RR1、RR1’
Resistance value is different, and voltage is identical, it can be seen that, load voltage and the resistance value of itself are unrelated.
In (b) in Fig. 7, RR2It is (caused by non-targeted frequency dry lower than 0.6V to be that 90kHz locates voltage peak-to-peak value in frequency
Disturb voltage), frequency is R at 180kHz in (a) in Fig. 7R2Voltage peak-to-peak value, which reaches, is up to 10V.It can be seen that being added
RR1′After load, RR2Load voltage is unaffected,
It can be obtained from two kinds of situation comparisons, when multi-load is powered simultaneously and when load is individually powered, load voltage amplitude phase
Together, the voltage of load does not change with the addition and reduction of other loads, this system has achieved the effect that load isolation, that is, loads
When individualism and in the presence of multiple loads, load voltage amplitude be it is the same, load both end voltage amplitude be load it is unrelated,
It is unrelated with own load and other loads, it is mutually isolated between each load.
Be supported on resonant frequency point voltage can according to demand, by adjust current amplitude or mutual inductance value (receiver and
Between transmitting) it is obtained, the interference voltage of non-targeted frequency effect can be reduced by improving receiver coil Q value.
It can be seen that a well-designed multifrequency multi-load wireless charging platform can be realized to the multiple of different frequency
Receiver is powered, and each receiver load both end voltage amplitude is that load is unrelated, with own load and other load nothings
It closes, it is mutually isolated between each load, it does not interfere with each other, current source is smaller to non-target receiver interference, and each load is mutually indepedent, no
Influence its charging effect.
Claims (1)
1. a kind of multifrequency multi-load wireless charging platform with load isolation characteristic, it is characterized in that by ac current source, transmitting
The receiver of coil, LC multifrequency tuning network and multiple and different working frequencies forms；
The ac current source is that can produce the ac current source containing N number of different frequency component, by AC-DC circuit, inversion
Circuit, FPGA control circuit are constituted；220V50/60Hz alternating current is powered after AC-DC is converted to inverter circuit；Inverter circuit uses
Full-bridge current-mode inverter circuit, while by the control signal of FPGA programming output inverter switching tube, obtain ac current source
Output current wave include required each sinusoidal frequency components, the angular frequencies of each sinusoidal frequency components is by ascending order row
Column are respectively ω1,ω2,…,ωN, the relationship of angular frequency and frequency meets ωi=2 π fi(i=1,2 ..., N), each sinusoidal frequency
Current weight amplitude is respectively I1,I2,…,IN；
The transmitting coil uses helmholtz coil structure, is equal to coil radius by two coaxial placements and centre distance
The coil of same size forms, and the specific value of the inductance of transmitting coil can be determined by application demand；
The LC multifrequency tuning network is the stairstepping lumped LC match network an of single port, including N number of parallel arm capacitor
With N-1 series arm inductance；
The receiver is made of receiving coil, tuning capacitance, load, and receiving coil passes through humorous with the magnetic coupling of transmitting coil
Electric energy is picked up in vibration；
Ac converter current source, transmitting coil L1, LC multifrequency tuning network be serially connected composition source emitting portion；It is connect when work
Receipts machine can be placed in any position of charging platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820751218.4U CN208386253U (en) | 2018-05-21 | 2018-05-21 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820751218.4U CN208386253U (en) | 2018-05-21 | 2018-05-21 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208386253U true CN208386253U (en) | 2019-01-15 |
Family
ID=64971222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820751218.4U Withdrawn - After Issue CN208386253U (en) | 2018-05-21 | 2018-05-21 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208386253U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667154A (en) * | 2018-05-21 | 2018-10-16 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
| CN111478457A (en) * | 2020-04-27 | 2020-07-31 | 中国矿业大学 | Multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control |
-
2018
- 2018-05-21 CN CN201820751218.4U patent/CN208386253U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667154A (en) * | 2018-05-21 | 2018-10-16 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
| CN108667154B (en) * | 2018-05-21 | 2024-03-29 | 南昌大学 | Multi-frequency multi-load wireless charging platform with load isolation characteristic |
| CN111478457A (en) * | 2020-04-27 | 2020-07-31 | 中国矿业大学 | Multi-frequency multi-load wireless power transmission system based on multi-modulation wave composite SPWM control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108667154B (en) | Multi-frequency multi-load wireless charging platform with load isolation characteristic | |
| US10027377B2 (en) | Wireless power supply apparatus | |
| CN104081623B (en) | Use can the wireless power transfer of resonator of independent tuning | |
| KR20120097239A (en) | Wireless power transfer system | |
| CN104993614A (en) | Asymmetric wireless power transmission system with relay coil inserted therein, and method | |
| CN208386253U (en) | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic | |
| JP2012039815A (en) | Wireless power supply method and wireless power supply system | |
| JP2018515057A (en) | Wireless electric field / magnetic field power transmission system, transmitter and receiver | |
| CN105305659A (en) | Magnetic coupling resonant wireless power transmission device | |
| CN115037062A (en) | Anti-offset hybrid wireless power transmission system and charging method thereof | |
| JP6652841B2 (en) | Non-contact power receiving device | |
| KR20140094779A (en) | wireless power transmitter | |
| US11735955B2 (en) | Resonant circuit for transmitting electric energy | |
| CN107196423A (en) | Based on 13.56MHz magnet coupled resonant type wireless power transfers | |
| KR102235673B1 (en) | Wireless power trasmission method using inphase feeding with dual loops and apparatus using the method | |
| CN109361272A (en) | A kind of high efficiency wireless charging power supply and its design method | |
| Kiratipongvoot et al. | Design a high-frequency-fed unity power-factor AC-DC power converter for wireless power transfer application | |
| CN114614580A (en) | PT symmetry-based parallel multi-transmitting multi-receiving wireless power transmission system | |
| US11539245B2 (en) | Resonant circuit for transmitting electric energy without a power amplifier | |
| CN109728655A (en) | Variable topological structure magnetic coupling resonant radio energy Transmission system and method | |
| Kavitha et al. | A comparative analysis on WPT system using various power transfer methodologies and core configurations | |
| KR20120033757A (en) | Wireless power transfer system using electromagnetic field resonator | |
| CN109617253A (en) | A kind of wireless charging device and its design method for cardiac pacing | |
| CN205509667U (en) | DC voltage is to power wireless transmission device of DC voltage | |
| CN106972649A (en) | Wireless charging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20240329 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20240329 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |