CN109149791A - A kind of radio energy transmission system of active relaying device and its composition - Google Patents
A kind of radio energy transmission system of active relaying device and its composition Download PDFInfo
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- CN109149791A CN109149791A CN201810961194.XA CN201810961194A CN109149791A CN 109149791 A CN109149791 A CN 109149791A CN 201810961194 A CN201810961194 A CN 201810961194A CN 109149791 A CN109149791 A CN 109149791A
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- coil
- repeating
- relaying device
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- active relaying
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of active relaying device and its radio energy transmission systems of composition, the active relaying device includes distributed generation resource, a transmitting coil, at least one repeating coil and a receiving coil, and the distributed generation resource is made of multiple inverters being set in transmitting coil and repeating coil that are distributed.Compared with prior art, the present invention has power distribution in the design on transmitting coil and repeating coil, simplifying inverter, reduces the equivalent distances of each load of power supply to space Arbitrary distribution, improves efficiency of transmission.
Description
Technical field
The present invention relates to wireless power transmission technical fields, more particularly, to a kind of active relaying device and its nothing of composition
Line electric energy transmission system.
Background technique
With the development of science and technology, wireless power transmission technology has obtained the concern of more and more people, especially
Using the proposition of the wireless power transmission of magnetic coupling resonance principle, a 60W electric light remote apart from power supply about 2m has successfully been lighted
Bubble, has evoked people to the research boom of wireless power transmission technology.With going deep into magnetic coupling harmonic technology research, various countries
Experts and scholars develop the wireless electric energy transmission device of various power grades, such as magnetic suspension train, anury household electrical appliances, implantation in succession
Formula Medical Devices, electric car and mobile device etc..
The wireless charging system charging distance for being currently based on magnetic coupling principle is limited, is unable to satisfy many working environments to filling
The requirement of electrical distance and efficiency.The use of repeating coil can be with the transmission range of significant increase radio energy transmission system.Relaying
Coupling when coil improves remote transmission although between adjacent windings, but there is also following deficiencies:
1, the passive relay loop construction being widely used at present, as shown in Figure 1, RE is passive relay coil, with relaying
The increase of number of coils, system loss increase, and system effectiveness is caused to reduce.
2, under the premise of proof load charge power is constant, additional power losses brought by offering trunk circle cause
Rated power for inverter needed for identical load power supply increases, and increases the difficulty of Design of Inverter.
3, when transmitting coil breaks down, whole system can not work passive relay coil system, system reliability
It is lower.
Above-mentioned deficiency limits the raising of radio energy transmission system efficiency and brings to the design of inverter many tired
It is difficult.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of active relaying devices
And its radio energy transmission system constituted.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of active relaying device for wireless charging, including distributed generation resource, a transmitting coil, at least one
After coil and a receiving coil, the distributed generation resource is distributed the inversion being set in transmitting coil and repeating coil by multiple
Power supply composition.
Further, the transmitting coil is identical with the structure of repeating coil.
Further, when the repeating coil and receiving coil are in Critical Coupling, active relaying device has optimal effect
Rate.
Further, the transmitting coil, repeating coil and receiving coil are on same level axis.
Further, when the repeating coil is equipped with one, the optimum efficiency η of active relaying deviceoptAre as follows:
Wherein, ω0For resonance frequency, L1、L2、L3Respectively the coil of transmitting coil, repeating coil and receiving coil from
Sense, r1、r2、r3The respectively coil resistance of transmitting coil, repeating coil and receiving coil, RsFor the internal resistance of source, RLFor load electricity
Resistance, k12The coefficient of coup between transmitting coil, repeating coil.
The present invention also provides a kind of radio energy transmission systems, including the active relaying device.
Further, which further includes a rectification circuit, and the receiving coil passes through the rectification circuit and load equipment
Connection.
Compared with prior art, the invention has the following advantages:
1) present invention realizes a kind of efficient active relay system, and the power demand of transmitting coil inverter is distributed in
The inverter of each repeating coil, active relaying coil had both been used as distributed emission coil at this time, while being also used as junction line
Circle, is simplified the design of inverter, while improving system reliability of operation.
2) present invention is by power distribution on transmitting coil and repeating coil, reducing power supply to each of space Arbitrary distribution
The equivalent distances of a load, improve efficiency of transmission.
3) application distribution formula power supply of the present invention, improves system reliability of operation.
4) it is identical as corresponding unrepeatered system to obtain the optimum efficiency of active relaying device of the invention for theory analysis, and compares
Corresponding passive relay system is high.
Detailed description of the invention
Fig. 1 is traditional passive relay coil system schematic equivalent circuit；
Fig. 2 is active relaying coil system schematic equivalent circuit of the present invention；
Fig. 3 is coefficient of coup k23With repeating coil and receiving coil distance d23Relation schematic diagram；
Fig. 4 is the frequency characteristic schematic diagram of active relay system efficiency, wherein (4a) is small-sized receiving coil (Small
RX), (4b) is medium-sized receiving coil (Medium RX), and (4c) is large-scale receiving coil (Large RX)；
Fig. 5 is system effectiveness and transmission range d13Relation schematic diagram, wherein (5a) be small-sized receiving coil (Small
RX), (5b) is medium-sized receiving coil (Medium RX), and (5c) is large-scale receiving coil (Large RX).
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Repeating coil is improved remote by coupling between enhancing adjacent windings and itself higher quality factor
Efficiency when transmission.In remote transmission, needs to place multiple repeating coils between transmitting and receiving coil and constitute domino
The loss of structure, multiple repeating coils greatly reduces the efficiency of system and proposes higher want to the power of inverter
It asks.The present invention provides a kind of active relaying device for wireless charging, including distributed generation resource, a transmitting coil, at least
One repeating coil and a receiving coil, distributed generation resource are set to inverse in transmitting coil and repeating coil by multiple distributions
Variable power source composition.The active relaying device is by power distribution on transmitting coil and repeating coil, and repeating coil is both as distribution
Formula transmitting coil, while it being also used as repeating coil, system effectiveness is high.
The present embodiment has carried out theory analysis using equivalent-circuit model (ECM) by taking single relay structure as an example.
The equivalent circuit of active relaying coil system is as shown in Fig. 2, in figure, and TX is transmitting coil, and AR is active relaying line
Circle, RX is receiving coil, VsFor high frequency electric source, L1、L2、L3Respectively the coil of transmitting coil, repeating coil and receiving coil from
Sense, r1、r2、r3The respectively coil resistance of transmitting coil, repeating coil and receiving coil, RsFor the internal resistance of source, C1、C2、C3For
Compensating electric capacity, RLFor load resistance, k12、k13、k23The coefficient of coup between coil.
Active relaying coil system loop current equation is as follows:
Wherein,
Ignore the cross-coupling between TX and RX, then each loop current are as follows:
Wherein
Under resonant state, system effectiveness are as follows:
WhereinTable
Show coil q.
Since there are frequency splittings for system, in Critical Coupling, the efficiency highest of system.
It enablesIt obtains
Formula (7) are substituted into formula (5), obtain the optimum efficiency of system
If transmitting coil is identical with repeating coil, i.e. Q1=Q2=Q,Then formula (8) becomes:
Passive relay system analysis:
Wherein
Ignore the cross-coupling between TX and RX, then each loop current are as follows:
Wherein
Under resonant state, system effectiveness are as follows:
Wherein
Comparative analysis
By formula (9), (13), due to Q'2> Q2, have
k23opt> k '23opt (15)
Compared to passive relay system, the peak efficiency of receiving coil is located closer to repeating coil in active relay system
(d23optIt is smaller) and the quality of receiving coil it is lower, d23optIt is smaller.
Since transmitting coil is identical with active relaying coil parameter, have
Then formula (16) is reduced to
Compared with traditional passive relay system, if repeating coil is identical as loading coil structure, by active relay system
Receiving coil to be placed in the position close to repeating coil more efficient, and the higher coefficient of coup has energy transmission at this time
Benefit.And formula (18) illustrates the active relaying coil and passive relay coil system for same parameter, active relay system
Efficiency is higher.
The coefficient of coup k of system23It is as shown in Figure 3 with the relationship of repeating coil and the distance between receiving coil.Fig. 4 is pair
Answer the frequency characteristic of the active relay system efficiency of three kinds of receiving coil sizes.Three kinds of couple states are corresponded in each case: being owed
Coupling, Critical Coupling, overcoupling.In the case of three kinds, when system enters Critical Coupling by undercoupling, efficiency rises；And by facing
When boundary is coupled into overcoupling, due to frequency splitting, efficiency is reduced.It is similar to general passive relay system, active relaying system
Efficiency highest when Critical Coupling of uniting at resonance frequency, and frequency splitting is generated in overcoupling.
The relationship of system effectiveness and transmission range is as shown in Figure 5.
Compared to passive relay system, receiving coil optimal location d in active relay system23optIt is smaller and receiving coil
Quality factor are lower, d23optIt is smaller.The optimal location of the receiving coil of active relay system is closer to repeating coil, between the two
Coupling it is stronger, be conducive to energy transmission.Meanwhile working as d23When smaller, the optimum efficiency of active relay system is higher than passive
Relay system；And work as d23When larger, situation is opposite.Therefore active relay system is suitable for closer distance transmission to improve transmission effect
Rate and passive relay system can be used for promoting transmission range.It is especially small in transmission range and when receiving coil is larger, such as scheme
D in (5c)13When=15cm, the efficiency of unrepeatered system is higher than corresponding passive relay system and active relay system.This is main
It is due to overcoupling between the repeating coil and receiving coil in relay system at this time, system has occurred frequency splitting, causes to imitate
Rate drastically reduces.Therefore, system effectiveness is not necessarily able to ascend using repeating coil.By scheme (5a), (5b), (5c) curve can
To find out, the optimum efficiency of various active relay systems is identical as corresponding unrepeatered system and is higher than corresponding passive relay system
System.
In another embodiment of the present invention, a kind of radio energy transmission system, including above-mentioned active relaying device are provided.It should
Radio energy transmission system can also include a rectification circuit, and receiving coil is connect by the rectification circuit with load equipment.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (7)
1. a kind of active relaying device for wireless charging, which is characterized in that including distributed generation resource, a transmitting coil,
At least one repeating coil and a receiving coil, the distributed generation resource are set to transmitting coil and junction line by multiple distributions
Inverter composition in circle.
2. the active relaying device according to claim 1 for wireless charging, which is characterized in that the transmitting coil and
The structure of repeating coil is identical.
3. the active relaying device according to claim 1 for wireless charging, which is characterized in that the repeating coil with
When receiving coil is in Critical Coupling, active relaying device has optimum efficiency.
4. the active relaying device according to claim 1 for wireless charging, which is characterized in that the transmitting coil,
Repeating coil and receiving coil are on same level axis.
5. the active relaying device according to claim 1 for wireless charging, which is characterized in that the repeating coil is set
When having one, the optimum efficiency η of active relaying deviceoptAre as follows:
Wherein, ω0For resonance frequency, L1、L2、L3The respectively self-induction of loop of transmitting coil, repeating coil and receiving coil, r1、
r2、r3The respectively coil resistance of transmitting coil, repeating coil and receiving coil, RsFor the internal resistance of source, RLFor load resistance, k12
The coefficient of coup between transmitting coil, repeating coil.
6. a kind of radio energy transmission system, which is characterized in that filled including active relaying a method as claimed in any one of claims 1 to 5
It sets.
7. radio energy transmission system according to claim 6, which is characterized in that including a rectification circuit, the reception
Coil is connect by the rectification circuit with load equipment.
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| CN201810961194.XA CN109149791A (en) | 2018-08-22 | 2018-08-22 | A kind of radio energy transmission system of active relaying device and its composition |
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Citations (7)
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|---|---|---|---|---|
| KR20130127227A (en) * | 2012-05-14 | 2013-11-22 | 전자부품연구원 | Active energy repeater for wireless power transmission and wireless power transmission method and system using the same |
| CN104682574A (en) * | 2015-02-09 | 2015-06-03 | 重庆大学 | U-shaped wireless power transmission coupled structure and design method thereof |
| CN105896753A (en) * | 2016-06-02 | 2016-08-24 | 东南大学 | Optimal frequency configuration method of single-repeater wireless power transmission system |
| US20160329753A1 (en) * | 2015-05-03 | 2016-11-10 | Powermat Technologies Ltd. | Wireless power transmission |
| CN106981933A (en) * | 2017-04-25 | 2017-07-25 | 东北大学 | Radio energy transmission system and based on apart from adaptive driving coil collocation method |
| CN206712555U (en) * | 2017-05-22 | 2017-12-05 | 中国神华能源股份有限公司 | Radio energy transmission system |
| 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 |
-
2018
- 2018-08-22 CN CN201810961194.XA patent/CN109149791A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130127227A (en) * | 2012-05-14 | 2013-11-22 | 전자부품연구원 | Active energy repeater for wireless power transmission and wireless power transmission method and system using the same |
| CN104682574A (en) * | 2015-02-09 | 2015-06-03 | 重庆大学 | U-shaped wireless power transmission coupled structure and design method thereof |
| US20160329753A1 (en) * | 2015-05-03 | 2016-11-10 | Powermat Technologies Ltd. | Wireless power transmission |
| CN105896753A (en) * | 2016-06-02 | 2016-08-24 | 东南大学 | Optimal frequency configuration method of single-repeater wireless power transmission system |
| CN106981933A (en) * | 2017-04-25 | 2017-07-25 | 东北大学 | Radio energy transmission system and based on apart from adaptive driving coil collocation method |
| CN206712555U (en) * | 2017-05-22 | 2017-12-05 | 中国神华能源股份有限公司 | Radio energy transmission system |
| 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 |
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Application publication date: 20190104 |
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