CN205029441U - Transmitting coil structure and use its wireless power transmitting terminal - Google Patents
Transmitting coil structure and use its wireless power transmitting terminal Download PDFInfo
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- CN205029441U CN205029441U CN201520829973.6U CN201520829973U CN205029441U CN 205029441 U CN205029441 U CN 205029441U CN 201520829973 U CN201520829973 U CN 201520829973U CN 205029441 U CN205029441 U CN 205029441U
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- coiling
- coil
- transmitting coil
- transmitting
- circle
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Abstract
The utility model discloses a transmitting coil structure and use its wireless power transmitting terminal. Transmitting coil is through first wire winding and the parallelly connected structure of second wire winding for under the condition that produces the same space magnetic field, the transmitting coil sense value of transmitting coil's sense value in than prior art is littleer, and like this, in the receiving terminal was close to transmitting coil, because transmitting coil's sense itself is worth less, the receiving terminal also will reduce the influence of transmitting coil sense value greatly, can not cause too big influence to former limit transmitting coil and resonant capacitor's impedance match, has improved the power transfer efficiency of system.
Description
Technical field
The utility model relates to wireless charging field, in particular, relates to a kind of transmitting coil structure and applies its radio energy transmitting terminal.
Background technology
Be illustrated in figure 1 the schematic block diagram of magnetic resonance type wireless electric energy transmission device, transmitting terminal includes the resonance structure that former edge emitting coil Ls and resonant capacitance Cs forms, and wherein, Ls comprises magnetizing inductance and leakage inductance part.Receiving terminal includes the resonance structure that secondary receiving coil Ld and resonant capacitance Cd forms.In order to ensure that wireless power can effectively transmit, the resonance frequency usually arranging former secondary resonance structure is consistent with the operating frequency f0 of system, and be such as set to the 6.78MHZ specified in wireless charging alliance (A4WP) standard, now efficiency of transmission is the highest.Wherein, in Fig. 1, T is transformer.
Transmitting coil receives input current, to produce space magnetic field, receiving coil responds to described space magnetic field, to obtain corresponding alternating voltage, but in the course of the work, when receiving terminal is near transmitting coil, the distribution of transmitting coil surrounding magnetic field can be affected, thus cause the inductance value of transmitting terminal circle Ls to change.Such as when receiving terminal is placed in diverse location around transmitting coil, the inductance value of transmitting coil Ls can not be identical, or, when have multiple receiving terminal near time, the inductance value of transmitting terminal circle Ls also can change.Now, building-out capacitor Cs and transmitting coil Ls impedance mismatch, affect the energy transmission efficiency of whole system.
Utility model content
In view of this, the utility model proposes a kind of transmitting coil structure and apply its radio energy transmitting terminal.The mode that this transmitting coil adopts two coiling parallel connections to be wound around, the mode that the single coiling series connection of the prior art that compares is wound around, can make when producing identical space magnetic field, the inductance value of transmitting coil of the present utility model significantly reduces than inductance value of the prior art, the inductance value impact of such receiving terminal on transmitting coil also reduces greatly, the building-out capacitor on transmitting coil and former limit is in impedance matching condition, ensures that the efficiency of transmission of system is high.
According to a kind of transmitting coil structure of the present utility model, comprise coil and expelling plate, described coil comprises input, output, the first coiling and the second coiling,
Described input and output are two end points adjacent on same plane;
The first end of described first coiling is connected to input, and the second end is connected to output, and the first end of described second coiling is connected to output, and the second end is connected to input;
Described first coiling and the second coiling are wound around for symmetry axis is symmetrical with the perpendicular bisector of line between input and output, jointly to form N circle coil, wherein, and N≤1.
Further, when the number of turn N of described coil is odd number, then described first coiling and the second coiling are wound around for symmetry axis carries out symmetry with described perpendicular bisector, and to obtain described N circle coil, and the first coiling and the second coiling are by described perpendicular bisector position;
When the number of turn N of described coil is even number, then described first coiling and the second coiling are wound around, to obtain described N circle coil for symmetry axis carries out symmetry with described perpendicular bisector;
Preferably, described first coiling and described second coiling material, thickness and length are identical.
Preferably, the N circle coil that described first coiling and described second coiling are formed jointly is the loop construction with symmetrical structure.
Preferably, described first coiling and described second coiling form N circle circular coil or square coil or oval coil jointly.
Preferably, described coil laminating is positioned on described expelling plate.
According to a kind of radio energy transmitting terminal of the present utility model, with the electric energy receiving terminal transmitting energy to isolation, described radio energy transmitting terminal comprises inverter circuit, ON-OFF control circuit and radiating portion,
Described inverter circuit receives external dc power, to produce high-frequency alternating voltage signal;
Described ON-OFF control circuit in order to control the switch motion of described inverter circuit breaker in middle pipe, to make switching tube in described inverter circuit in the conducting of no-voltage place;
Described radiating portion includes transmitting coil and resonant capacitance, the transmitting coil structure that described transmitting coil is above-mentioned, and resonance frequency and the predeterminated frequency of described resonant capacitance and described transmitting coil are consistent.
Preferably, described predeterminated frequency is the system operating frequency of described electric energy transmitting terminal and described electric energy receiving terminal.
According to above-mentioned transmitting coil structure and the radio energy transmitting terminal applying it.Transmitting coil is by the first coiling and the second coiling symmetrical winding in parallel, to obtain N circle coil, make when producing identical space magnetic field, the inductance value that the inductance value of transmitting coil is wound around than connecting in prior art is less, such as, under the same number of turn, in the utility model, transmitting coil inductance value can reduce 75% than the transmitting coil inductance value of cascaded structure of the prior art, like this, when receiving terminal is in transmitting coil, because the inductance value of transmitting coil itself is less, receiving terminal also will reduce greatly on the impact of transmitting coil inductance value, too large impact can not be caused to the impedance matching of former edge emitting coil and resonant capacitance, improve the delivery of electrical energy efficiency of system.
Accompanying drawing explanation
Figure 1 shows that the schematic block diagram of magnetic resonance type wireless electric energy transmission device;
Figure 2 shows that the structure chart of a circle coil of transmitting coil in prior art;
Figure 3 shows that the structure chart of the first embodiment according to transmitting coil of the present utility model;
Figure 4 shows that the structure chart of two circle coils of transmitting coil in prior art;
Figure 5 shows that the structure chart of the second embodiment according to transmitting coil of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiment of the present utility model is described in detail, but the utility model is not restricted to these embodiments.The utility model contain any make on marrow of the present utility model and scope substitute, amendment, equivalent method and scheme.To have the utility model to make the public and understand thoroughly, in following the utility model preferred embodiment, describe concrete details in detail, and do not have the description of these details also can understand the utility model completely for a person skilled in the art.
In prior art, transmitting coil often adopts the mode be connected in series, as shown in Figure 2, for a circle transmitting coil, the coiling of described transmitting coil is held from A end around to B, the mid point of note coiling is O point, then described transmitting coil can be seen as coiling AO and coiling OB two parts are connected in series, if the inductance value of AO part coiling is 0.5Ls, then total inductance value of described transmitting coil is Ls.
And adopt transmitting coil structure of the present utility model, described transmitting coil structure comprises coil and expelling plate, described coil laminating is positioned over described reflecting plate, as shown in Figure 3, described coil comprise input as A end, output as B end, the first coiling 1. with the second coiling 2., side a and b is two end points adjacent on same plane, electric current is defined from the input of A end in the present embodiment, export from B end, easy understand, current direction can exchange.First coiling 1. with the second coiling, two end points 2. connect described side a and b respectively, to form parallel connection structure, 2. first coiling 1. and the second coiling is wound around for symmetry axis is symmetrical with the perpendicular bisector of line between input and output, common formation N circle coil, wherein, N≤1, here for a circle circular coil, as shown in Figure 3, in the present embodiment, first coiling 1. with the second coiling material 2., thickness and length are identical, such as, first coiling 1. with the second coiling winding length 2. comprises the length of half circular arc and perpendicular bisector respectively, the length of the first coiling 1. with the second coiling 2. in perpendicular bisector position is equal.Those skilled in the art are known, described N circle coil can also for square, oval or other have the figure of symmetrical structure.
Structure chart according to Fig. 3, first coiling 1. with in Fig. 2 AO part winding length be approximately equal, when material, thickness etc. are all identical, then the first coiling inductance value 1. is also 0.5Ls, in like manner, second coiling inductance value 2. is also 0.5Ls, then total inductance value of the transmitting coil in the present embodiment is Ls/4.When passing through the electric current of formed objects in coiling, as input input 2I
xelectric current, then the electric current in the first coiling 1. with the second coiling is 1. I
x, because the length of the first coiling 1. with the second coiling 1. in perpendicular bisector position is equal in the present embodiment, cancel out each other, as also passed through I in a circle coil in prior art in the magnetic field therefore produced at perpendicular bisector place
xelectric current, then in the space magnetic field that produces of the present embodiment and prior art, the space magnetic field that produces is equal sizes, and according to the calculating of above-mentioned inductance value, the inductance value of the coil in the present embodiment is only 1/4 of existing inductance value, that is, compared to prior art, the transmitting coil structure inductance value in the present embodiment reduces 75%, like this, extraneous factor also will reduce greatly on the impact of transmitting coil inductance value.Such as, when same electric energy receiving terminal is placed on same position around transmitting coil shown in Fig. 2 and Fig. 3, the affect percentage of receiving terminal on transmitting coil surrounding magnetic field is consistent, all 20% is reduced as made the inductance value of coil shown in Fig. 2 and Fig. 3, namely the inductance value of coil shown in Fig. 2 reduces 0.2*Ls=Ls/5, and the inductance value of coil shown in Fig. 3 reduces 0.2*Ls/4=Ls/20.Obviously, can see, adopt loop construction in parallel shown in Fig. 3, the change of coil inductance value reduces greatly compared to the transmitting coil of cascaded structure, makes the inductance value of transmitting coil more stable.
When described transmitting coil is applied in wireless electric energy transmission device, because electric energy transmitting terminal and electric energy receiving terminal are operated in system operating frequency f
0time, efficiency of transmission is the highest, adopts the transmitting coil of the utility model embodiment, in frequency f
0on working point, the impedance of transmitting coil has only changed 2 π fOL
s/ 20, f
0for system resonance frequencies, significantly reduce the degree of transmitting coil impedance mismatch, system transfers efficiency keeps higher.
Figure 4 shows that the structure chart of two circle coils of transmitting coil in prior art, in like manner, obtain two circle coils by a coiling in prior art, two end points are side a and b, then be set to O point in the centre position of described coiling, described like this coiling can regard being connected in series as AO and OB two coilings as, and the inductance value of note AO and OB coiling is 0.5Ls, then total inductance value of two circle coils of the prior art is Ls.And according to the winding mode of the utility model embodiment, with reference to the structure chart that Figure 5 shows that the second embodiment according to transmitting coil of the present utility model, by two coilings, as the mode that 2. the first coiling 1. with the second coiling in Fig. 5 is connected in parallel, first coiling the first termination A end 1., second termination B end, first termination B end of the second coiling, second termination A end, 2. first coiling 1. with the second coiling is wound around about the perpendicular bisector symmetry of AB end, further, 2. the first coiling 1. with the second coiling forms two circle circular coils jointly.In the present embodiment, first coiling 1. with the second coiling inductance value is 2. 0.5Ls, then total inductance value of coil shown in Fig. 5 is Ls/4, time in each coiling by identical electric current, the transmitting coil of the utility model embodiment is the same with the space magnetic field size that transmitting coil of the prior art produces, and inductance value at least reduces 75%, have inductance value equally and stablize, efficiency of transmission is high.
Finally, the invention also discloses a kind of radio energy transmitting terminal, with the electric energy receiving terminal transmitting energy to isolation, described radio energy transmitting terminal comprises inverter circuit, ON-OFF control circuit and radiating portion, described inverter circuit receives external dc power, to produce high-frequency alternating voltage signal; Described ON-OFF control circuit is in order to control the switch motion of described inverter circuit breaker in middle pipe, to make switching tube in described inverter circuit in the conducting of no-voltage place, described inverter circuit can be full-bridge or the inverter circuit such as half-bridge or ClassE or ClassD in prior art, described ON-OFF control circuit can be the control circuit of prior art or improvement, as being the soft switch control circuit structure described in 201520579872.8 for number of patent application.
Described electric energy transmitting terminal also includes transmitting coil and resonant capacitance, described transmitting coil is above-mentioned transmitting coil structure, resonance frequency and the predeterminated frequency of described resonant capacitance and described transmitting coil are consistent, and described predeterminated frequency is the system operating frequency of described electric energy transmitting terminal and described electric energy receiving terminal.
By above-mentioned winding structure in parallel, the inductance value of the transmitting coil of electric energy transmitting terminal can be made greatly to reduce, therefore, in the course of the work, the inductance value impact of electric energy receiving terminal on transmitting coil also will reduce greatly, can make the transmitting coil of electric energy transmitting terminal and resonance condensance not matching degree greatly reduce, system transfers efficiency keep higher.
Need it is noted that, illustrate that utility model of the present utility model is conceived with a circle or two circle coil examples in the utility model embodiment, but those skilled in the art are known, the utility model can reasoning to multi turn coil arrangement, its principle is identical with a circle or two circle coils, the inductance value of transmitting coil can also be made greatly to reduce, obtain good stability, the beneficial effect that energy transmission efficiency is high.
Detailed description has been carried out above to according to the transmitting coil structure of preferred embodiment of the present utility model and the radio energy transmitting terminal of applying it; those of ordinary skill in the art can know other analog structure and layouts etc. by inference according to above-described embodiment accordingly and all can be applicable to the utility model, and the amendment done in thought range of the present utility model and replacement are all within protection range of the present utility model.
According to embodiment of the present utility model as described above these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this utility model is only described yet.Obviously, according to above description, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present utility model and practical application better, thus makes art technical staff that the utility model and the amendment on the utility model basis can be utilized well to use.The utility model is only subject to the restriction of claims and four corner and equivalent.
Claims (8)
1. a transmitting coil structure, comprises coil and expelling plate, it is characterized in that, described coil comprises input, output, the first coiling and the second coiling,
Described input and output are two end points adjacent on same plane;
The first end of described first coiling is connected to input, and the second end is connected to output, and the first end of described second coiling is connected to output, and the second end is connected to input;
Described first coiling and the second coiling are wound around for symmetry axis is symmetrical with the perpendicular bisector of line between input and output, jointly to form N circle coil, wherein, and N≤1.
2. transmitting coil structure according to claim 1, it is characterized in that, when the number of turn N of described coil is odd number, then described first coiling and the second coiling are wound around for symmetry axis carries out symmetry with described perpendicular bisector, to obtain described N circle coil, and the first coiling and the second coiling are by described perpendicular bisector position;
When the number of turn N of described coil is even number, then described first coiling and the second coiling are wound around, to obtain described N circle coil for symmetry axis carries out symmetry with described perpendicular bisector;
3. transmitting coil structure according to claim 1, is characterized in that, described first coiling and described second coiling material, thickness and length are identical.
4. transmitting coil structure according to claim 1, is characterized in that, the N circle coil that described first coiling and described second coiling are formed jointly is the loop construction with symmetrical structure.
5. transmitting coil structure according to claim 4, is characterized in that, described first coiling and described second coiling form N circle circular coil or square coil or oval coil jointly.
6. transmitting coil structure according to claim 1, is characterized in that, described coil laminating is positioned on described expelling plate.
7. a radio energy transmitting terminal, with the electric energy receiving terminal transmitting energy to isolation, it is characterized in that, described radio energy transmitting terminal comprises inverter circuit, ON-OFF control circuit and radiating portion,
Described inverter circuit receives external dc power, to produce high-frequency alternating voltage signal;
Described ON-OFF control circuit in order to control the switch motion of described inverter circuit breaker in middle pipe, to make switching tube in described inverter circuit in the conducting of no-voltage place;
Described radiating portion includes transmitting coil and resonant capacitance, and described transmitting coil is the arbitrary described transmitting coil structure of claim 1-6, and resonance frequency and the predeterminated frequency of described resonant capacitance and described transmitting coil are consistent.
8. radio energy transmitting terminal according to claim 7, is characterized in that, described predeterminated frequency is the system operating frequency of described electric energy transmitting terminal and described electric energy receiving terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520829973.6U CN205029441U (en) | 2015-10-24 | 2015-10-24 | Transmitting coil structure and use its wireless power transmitting terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520829973.6U CN205029441U (en) | 2015-10-24 | 2015-10-24 | Transmitting coil structure and use its wireless power transmitting terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205029441U true CN205029441U (en) | 2016-02-10 |
Family
ID=55261944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520829973.6U Withdrawn - After Issue CN205029441U (en) | 2015-10-24 | 2015-10-24 | Transmitting coil structure and use its wireless power transmitting terminal |
Country Status (1)
| Country | Link |
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| CN (1) | CN205029441U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186720A (en) * | 2015-10-24 | 2015-12-23 | 宁波微鹅电子科技有限公司 | Transmitting coil structure and wireless electric energy transmitting terminal applying transmitting coil structure |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
-
2015
- 2015-10-24 CN CN201520829973.6U patent/CN205029441U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186720A (en) * | 2015-10-24 | 2015-12-23 | 宁波微鹅电子科技有限公司 | Transmitting coil structure and wireless electric energy transmitting terminal applying transmitting coil structure |
| CN105186720B (en) * | 2015-10-24 | 2017-12-26 | 宁波微鹅电子科技有限公司 | A kind of transmitting coil structure and apply its radio energy transmitting terminal |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160210 Effective date of abandoning: 20171226 |