CN106877527A - Wireless energy transfer method based on different resonant frequency ancillary coils - Google Patents
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Abstract
The invention discloses a kind of wireless energy transfer method based on different resonant frequency ancillary coils, wireless transmitting system is built first, the system includes HF signal generator, transmitting coil, receiving coil, ancillary coil and load；Transmitting coil and receiving coil are tuned secondly by variable capacitance, makes both that there is identical resonant frequency, and ancillary coil has different self-resonant frequencies, HF signal generator produces high frequency resonant signals so that transmitting coil and receiving coil produce resonance；Finally according to transmission range, the spacing of regulation ancillary coil and transmitting coil and ancillary coil and receiving coil enables power transmission efficiency as the change all-the-time stable of transmission range is more than 60%；Advantages of the present invention is：Design structure is simple, it is easy to accomplish；The phenomenon of frequency splitting can be alleviated, efficient energy transmission is realized；When transmission range changes, power transmission efficiency remains higher level, has a wide range of application, strong adaptability.
Description
Technical field
The present invention relates to wireless power transmission, more particularly to a kind of height by increasing the ancillary coil of different resonant frequencies
Efficiency wireless energy transfer method.
Background technology
Wireless energy transfer (Wireless Power Transmission, WPT) be one communication, industry, medical treatment,
There is the practical technique of huge applications prospect in the fields such as consumer electronics.WPT technologies can be wirelessly transferred energy, make it is portable, can
Wearable really breaks away from the limitation of power line；Can with remote transmission energy, solve radio sensing network in from principal mode node,
Autonomous humanoid robot, the powerup issue of RFID label tag；Barrier transmission energy is may also pass through, makes the continuous of medical science implanted equipment
Boat is ensured.WPT technologies are broadly divided into：Induction type WPT, resonant WPT, and radiant type WPT.Three kinds of technologies respectively have excellent lacking
Point：Induction type WPT technologies can obtain larger efficiency of transmission, but efficiency of transmission with the increase of distance when distance is extremely near
It is rapid to decline；Radiant type WPT can utilize directed radiation to obtain larger transmission range, but its efficiency of transmission is relatively low, and deposit
In the possibility of radio-frequency pollution.
Resonant WPT is then using the Critical Coupling between each independent self-resonant coil, by the transmission of induction type WPT
Distance brings up to and is several times as much as coil dimension, in the case of sacrificial section efficiency of transmission, obtains more considerable transimission power.So
And, the transmission range of traditional resonant WPT nevertheless suffers from the limitation of coil dimension, it is impossible to realize medium and long distance (transmission range
Several times in coil dimension) energy transmission.In recent years, in order to realize the WPT of medium and long distance, researcher begins attempt to use many
Individual repeating coil is expanding the transmission range of resonant wireless energy transfer.It is this to include a transmitting coil, multiple junction lines
Circle, the wireless energy transfer mode of one or more receiving coils are referred to as " midsequent wireless energy transfer (Wireless
Power Transfer with Relay Resonators)”.The structure of this multiple coupled resonance rings earliest by
E.Shamonina et al. proposed that be mainly used in the communication of sensing network, the structure is by multiple toroidal cavity resonators row in 2002
In alignment or curve, electromagnetic wave long-distance communications are enable using the magnetic coupling between resonator, thus are referred to as " magnetic strength
Answer waveguide (MIW, Magneto-inductive waveguide) ".In recent years, this magnetic induction waveguiding structure is used for wirelessly
Energy is transmitted, also referred to as " midsequent WPT ", " domino resonance type wireless energy transmission (Wireless Power Domino-
Resonator System) " or " array wireless power transfer (WPT System with Array of Resonators) " etc..
This traditional " midsequent WPT " requirement of system design all coils (including transmitting coil, repeating coil and reception
Coil) it is tuned under identical resonant frequency and realizes resonance transfer energy.When number of coils increase is relayed, inevitably
The phenomenon of frequency of occurrences division.The phenomenon of this frequency splitting can cause that system efficiency at resonant frequency is very low.In order to solve
This problem, domestic and international many researchers it is also proposed the method for frequency-tracking and impedance matching, but implement comparing and answer
It is miscellaneous.Therefore, we have proposed a kind of new system architecture, the phenomenon of frequency splitting, efficient Transmission system can be alleviated
Energy.
The content of the invention
Goal of the invention：For magnetic coupling resonance radio energy transmission system with the increase of transmission range, the coefficient of coup
The problem for reducing and causing system transfers efficiency drastically to decline, it is an object of the invention to provide one kind by increasing different resonance frequently
Wireless power transmission method of the rate ancillary coil to alleviate frequency splitting, realize the transmission of high efficiency electric energy.
Technical scheme：Wireless energy transfer method based on different resonant frequency ancillary coils of the present invention, including
Following steps：
(A) wireless transmitting system is built, the system includes HF signal generator, transmitting coil, receiving coil, auxiliary
Coil and load, wherein, HF signal generator is connected with transmitting coil, and receiving coil is connected with load, and ancillary coil is placed
Certain position near load；The transmitting coil and receiving coil have identical structure and electrical parameter；And transmitting coil,
Any distance between the two is adjustable in receiving coil and ancillary coil；
(B) transmitting coil, receiving coil and ancillary coil are using the equivalent resistance under high frequency, own inductance and variable capacitance
Respective resonance circuit is separately constituted, and specific resonant frequency is produced by variable capacitance tuning circuit；Wherein, transmitting coil
There is identical resonant frequency f1 with receiving coil, the self-resonant frequency of ancillary coil is f2, and f2 ≠ f1；
(C) HF signal generator produces high frequency resonant signals, its frequency and transmitting coil, the resonant frequency of receiving coil
It is identical so that transmitting coil and receiving coil produce resonance；
(D) according to the transmission range between transmitting coil and receiving coil, regulation ancillary coil position therebetween,
Enable power transmission efficiency as the change all-the-time stable of transmission range is more than 60%.
The transmitting coil, receiving coil and ancillary coil are formed by copper wire winding, and diameter parallel is met on position.
The ancillary coil can be one or more, when transmitting coil is far with the spacing of receiving coil or relative position
When putting more complicated, an ancillary coil may can not realize that efficiency is more excellent, at this time be accomplished by increasing the individual of ancillary coil
The resonant frequency of ancillary coil is counted or adjusts to realize efficiency optimization.
Beneficial effect：Compared with prior art, the present invention has advantages below：Design structure is simple, it is easy to accomplish；It is based on
New system architecture, can alleviate the phenomenon of frequency splitting, realize efficient energy transmission；When transmission range changes
When, power transmission efficiency remains higher level, has a wide range of application, strong adaptability.
Brief description of the drawings
Fig. 1 is the structural representation of wireless energy transfer system of the invention；
Fig. 2 is the equivalent-circuit model figure of wireless energy transfer system of the invention；
Fig. 3 is only transmitting coil and during receiving coil, the pass of wireless power transfer system transfers distance and power transmission efficiency
It is schematic diagram；
Fig. 4 is when ancillary coil couples a timing, coupling and biography between transmitting coil and ancillary coil with receiving coil
Influence figure of the change of defeated distance to power transmission efficiency；
Fig. 5 is the efficiency of transmission contrast based on different resonant frequency ancillary coils and based on identical resonance frequency ancillary coil
Figure.
Specific embodiment
Technical scheme is described further with reference to the accompanying drawings and examples.
As shown in figure 1, based on the wireless energy transfer system for increasing different resonant frequency ancillary coils, including high-frequency signal
Generator 1, transmitting coil 2, receiving coil 3, ancillary coil 4 and load 5.HF signal generator 1 sends high-frequency signal arteries and veins
Punching, sends energy signal to transmitting coil 2, and receiving coil 3 is obtained by the magnetic coupling resonance between coil from transmitting coil 2
The high-frequency oscillation signal that HF signal generator 1 is sent, receiving coil 3 supplies energy to load 5 and load equipment again.
As shown in Fig. 2 the equivalent-circuit model of magnetic coupling resonance wireless power transfer system proposed by the present invention has three lines
Circle loop, respectively launching circuit receives loop and subsidiary loop, wherein, transmitting coil 2, receiving coil 3 and ancillary coil 4
Using its own equivalent resistance in high frequency, own inductance and variable capacitance composition resonance circuit, the effect of variable capacitance is
Tuning circuit produces specific resonant frequency；Transmitting coil 2 and receiving coil 3 have identical structure and electrical parameter, by variable
Capacitance tuning is into identical resonant frequency.On this basis, HF signal generator 1 sends and transmitting coil 2 and reception
The high frequency resonant signals of the identical resonance frequency of coil 3 so that transmitting coil 2 and receiving coil 3 produce resonance.When transmitting coil 2
When being changed with the distance between receiving coil 3, ancillary coil 4 and transmitting coil 2 and ancillary coil 4 are adjusted respectively and is connect
Spacing between take-up circle 3, makes the coefficient of coup between the coil of the spacing of three, i.e., three meet certain relation, makes power
Efficiency of transmission can be as the change all-the-time stable of transmission range be more than 60%, you can realize when transmission range changes, work(
Rate efficiency of transmission keeps higher level.
The working frequency of the wireless energy transfer system of the present embodiment is f=30MHz, and power supply and the resistance for loading are respectively
The parameter of 50 Ω, transmitting coil 2, receiving coil 3 and ancillary coil 4 is as shown in table 1.
Table 1
In Fig. 2, VSIt is the voltage of the generation signal of extrinsic motivated source HF signal generator 1；Rs is extrinsic motivated source high frequency
The internal resistance of signal generator；Coil resonance loop for wireless energy transmission includes inductance LT, variable capacitance CT, under high frequency
Equivalent resistance RTP；Ancillary coil resonant tank includes inductance L1, variable capacitance C1, the resistance R under high frequency1P；For wireless receiving
Coil resonance loop include inductance L2, variable capacitance C2, the resistance R under high frequency2P；RXIt is load impedance.The exchange of system power supply
The inductance of voltage and internal resistance and the resonant tank of transmitting coil 2, electric capacity and dead resistance are series relationship；The electricity of receiving coil 3
Sense, electric capacity and dead resistance are series relationship with load 5.The computing formula of variable capacitance C is：
ITIt is the electric current on transmitting coil 2；IX1It is the electric current on ancillary coil 4；IX2It is receiving coil 3 and flows through load 5
On electric current；
Mt1It is the mutual inductance between transmitting coil 2 and ancillary coil 4；Mt2It is between transmitting coil 2 and receiving coil 3
Mutual inductance；M12It is the mutual inductance between ancillary coil 4 and receiving coil 3；
Resonant frequency：
Load-receipt power (The Load Power)：
Power transmission efficiency (power transfer efficiency)：
In the case of no ancillary coil, as shown in Figure 3 and Figure 4, power transmission efficiency can be with transmitting coil 2 and connecing
The increase of the spacing between take-up circle 3, i.e. transmission range and strongly reduce.When wireless energy transfer system working frequency f with
There is resonance transmission energy when transmitting coil 2 is identical with the resonant frequency of receiving coil 3, between transmitting coil 2 and receiving coil 3
Amount.And as transmission range changes, the input impedance of port changes, efficiency of transmission is caused to drastically reduce.Now
If adding the ancillary coil 4 with different resonant frequencies, it becomes possible to function well as the effect of impedance matching, alleviate because of distance
The influence for changing and causing efficiency to strongly reduce.
The equivalent circuit of the system is analyzed according to Kirchoff s voltage current law can obtain below equation：
Wherein, λij=ω Mij, Z represents the impedance on each coil.
Determinant in above-mentioned steps solves electric current ITAnd IX2, the transmission power value of system can be obtained.As shown in figure 5,
Only when the value of λ t1 is equal to more than 100, in whole transmission range change procedure, efficiency of transmission can be maintained at all the time
More than 60%.
Claims (4)
1. a kind of wireless energy transfer method based on different resonant frequency ancillary coils, it is characterised in that comprise the following steps：
(A) wireless transmitting system is built, the system includes HF signal generator (1), transmitting coil (2), receiving coil
(3), ancillary coil (4) and load (5)；Wherein, HF signal generator (1) is connected with transmitting coil (2), receiving coil (3)
It is connected with load (5), any distance between the two is adjustable in transmitting coil (2), receiving coil (3) and ancillary coil (4)；Institute
Transmitting coil (2) and receiving coil (3) are stated with identical structure and electrical parameter；
(B) transmitting coil (2), receiving coil (3) and ancillary coil (4) are using the equivalent resistance under high frequency, own inductance and can
Become electric capacity and separately constitute resonance circuit, specific resonant frequency is produced by variable capacitance tuning circuit；Wherein, transmitting coil
(2) and receiving coil (3) is with identical resonant frequency f1, the self-resonant frequency of ancillary coil is f2, f2 ≠ f1；
(C) it is the high frequency resonant signals of f1 that HF signal generator (1) produces frequency so that transmitting coil (2) and receiving coil
(3) resonance is produced；
(D) according to the distance between transmitting coil (2) and receiving coil (3), regulation ancillary coil (4) position therebetween
Put, enable power transmission efficiency as the change all-the-time stable of transmission range is more than 60%.
2. the wireless energy transfer method based on different resonant frequency ancillary coils according to claim 1, its feature exists
In：The transmitting coil (2), receiving coil (3) and ancillary coil (4) are formed by copper wire winding.
3. according to claim 1 based on the wireless energy transfer method for increasing ancillary coil, it is characterised in that：The hair
Ray circle (2), receiving coil (3) and ancillary coil (4) diameter parallel.
4. according to claim 1 based on the wireless energy transfer method for increasing ancillary coil, it is characterised in that：It is described auxiliary
Index contour circle (4) is one or more.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546869A (en) * | 2017-10-09 | 2018-01-05 | 中国矿业大学(北京) | The suppressing method of three-winding wireless power transmission systems frequency splitting phenomenon |
| CN110098663A (en) * | 2019-05-20 | 2019-08-06 | 云南电网有限责任公司丽江供电局 | A kind of radio energy transmission system and configuration method of high pressure on-line monitoring equipment |
| CN110233524A (en) * | 2019-06-24 | 2019-09-13 | 天津大学 | Simulate the self-resonance controlled, super-silent wireless power supply system |
| CN110770999A (en) * | 2017-06-16 | 2020-02-07 | 元板有限公司 | Magnetic induction wave control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738908A (en) * | 2011-03-29 | 2012-10-17 | 索尼公司 | Power supply device, power supply system, and electronic device |
| CN105896741A (en) * | 2016-05-30 | 2016-08-24 | 东南大学 | Wireless power transmission system power efficiency optimization method based on matching efficiency set element exhaustion method |
-
2017
- 2017-03-13 CN CN201710146082.4A patent/CN106877527A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738908A (en) * | 2011-03-29 | 2012-10-17 | 索尼公司 | Power supply device, power supply system, and electronic device |
| CN105896741A (en) * | 2016-05-30 | 2016-08-24 | 东南大学 | Wireless power transmission system power efficiency optimization method based on matching efficiency set element exhaustion method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110770999A (en) * | 2017-06-16 | 2020-02-07 | 元板有限公司 | Magnetic induction wave control |
| CN107546869A (en) * | 2017-10-09 | 2018-01-05 | 中国矿业大学(北京) | The suppressing method of three-winding wireless power transmission systems frequency splitting phenomenon |
| CN110098663A (en) * | 2019-05-20 | 2019-08-06 | 云南电网有限责任公司丽江供电局 | A kind of radio energy transmission system and configuration method of high pressure on-line monitoring equipment |
| CN110098663B (en) * | 2019-05-20 | 2023-04-07 | 云南电网有限责任公司丽江供电局 | Wireless power transmission system and configuration method of high-voltage online monitoring equipment |
| CN110233524A (en) * | 2019-06-24 | 2019-09-13 | 天津大学 | Simulate the self-resonance controlled, super-silent wireless power supply system |
| CN110233524B (en) * | 2019-06-24 | 2023-09-26 | 天津大学 | Analog controlled self-resonance and ultra-silent wireless power supply system |
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