CN205142776U - Electromagnetic shield layer and have electromagnetic shield layer's wireless power transmission device - Google Patents
Electromagnetic shield layer and have electromagnetic shield layer's wireless power transmission device Download PDFInfo
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- CN205142776U CN205142776U CN201520696004.8U CN201520696004U CN205142776U CN 205142776 U CN205142776 U CN 205142776U CN 201520696004 U CN201520696004 U CN 201520696004U CN 205142776 U CN205142776 U CN 205142776U
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Abstract
The utility model discloses an electromagnetic shield layer and have electromagnetic shield layer's wireless power transmission device, through the structure that sets up first shielding layer as that hollow region and solid region combine together, because the magnetic resistance of air is greater than the magnetic resistance of magnetic sheet in the hollow region, like this, the provocative high frequency magnetic field magnetic line of force of former limit transmitting coil is difficult to through hollow region, can so that in the course of the work the transmitting coil's on former limit sense value be difficult to receive the change influence of magnetic resistance, the inductance value remains stable, simultaneously, set up the magnetic sheet in receiving coil's below region as far as possible to guarantee receiving coil and transmitting coil's coupling, improve transmission efficiency. The utility model discloses an electromagnetic shield layer is through individual layer and the double -deck shielding mode that combines together, can effectively reduce the magnetic sheet to the influence of transmitting coil sense value, improvement transmission system efficiency.
Description
Technical field
The utility model relates to wireless charging field, in particular, relates to a kind of electro-magnetic screen layer and has the wireless electric energy transmission device of electro-magnetic screen layer.
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 unit 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 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 pure transformer.
On the other hand, in order to improve the energy acceptance efficiency of receiving terminal and suppress transmitting terminal magnetic field to the interference of charging device, usually receiving coil is placed on the screen be made up of magnetic sheet and copper sheet, as shown in Figure 2, because the magnetic resistance of magnetic sheet is smaller, magnetic field can be attracted, the field weakening in magnetic sheet underlying space can be made like this, thus reduce magnetic field on be positioned over below magnetic sheet by the impact of charging device, and high frequency magnetic field can produce eddy current on copper sheet, disturbing magnetic field is offset further on by the impact of charging device in the opposing magnetic field that eddy current produces, thus at utmost protect by charging device.
But, when receiving terminal coil and transmitting terminal coil distance nearer time, because the magnetic resistance of magnetic sheet is lower, the magnetic field of transmitting coil forms closed-loop path easily via the magnetic sheet of receiving terminal, as shown in Figure 3, like this, the flux loop of transmitting terminal coil surrounding magnetic field shortens, thus causes the inductance value of transmitting coil to increase, as become Ls ', now building-out capacitor Cs and primary coil Ls ' can not on system operating frequency resonance, will the efficiency of transmission of energy be affected.
Utility model content
In view of this, the utility model proposes a kind of electro-magnetic screen layer and there is the wireless electric energy transmission device of electro-magnetic screen layer.By the first screen is set to hollow area and solid area two parts, the high frequency magnetic field of transmitting coil is not easy by hollow area, thus reduces transmitting coil inductance value change in the course of the work, the efficiency of transmission of effective raising system.
According to a kind of electro-magnetic screen layer of the present utility model, in order to the interference of shielding space magnetic field to power consumption equipment, comprise,
First screen, comprises the magnetic shield be made up of hollow area and solid area;
Secondary shielding layer, is positioned under the first screen, to shield the magnetic field through described first screen, and protection power consumption equipment;
Wherein, described hollow area is in order to increase the magnetic resistance of described space magnetic field.
Further, described hollow area is positioned at the center of described first screen, and described solid area is positioned at the surrounding of described first screen, to surround described hollow area.
Further, described hollow area is positioned at the centre position of described first screen, and described solid area is positioned at two side positions of described first screen, to be distributed in the both sides of described hollow area,
Further, described hollow area is equal with the length of described solid area.
Further, the magnetic sheet of setting size is placed in the end positions symmetry of described hollow area, to increase the area of described solid area.
Further, described solid area is positioned at four end Angle Position of described first screen, and described hollow area is positioned at the rest position of described first screen.
Further, the magnetic sheet of at least one setting size is placed in described hollow area position, to increase the area of described solid area.
According to a kind of wireless electric energy transmission device with magnetic field shielding layer of the present utility model, comprising:
Electric energy transmitting terminal, comprises electric energy transmitting coil, and described electric energy transmitting coil receives alternating voltage to be converted to high-frequency emission magnetic field;
Electric energy receiving terminal, comprises electric energy receiving coil and electro-magnetic screen layer, and described electric energy receiving coil responds to described high-frequency emission magnetic field to obtain corresponding high frequency voltage, and described high frequency voltage obtains suitable output voltage supply power consumption equipment after rectifying and wave-filtering process;
Described electro-magnetic screen layer is positioned between described electric energy receiving coil and power consumption equipment, and described electro-magnetic screen layer comprises the first screen and secondary shielding layer,
Described first screen comprises the magnetic shield be made up of hollow area and solid area, and described hollow area, in order to increase the magnetic resistance in described high-frequency emission magnetic field, is launching the change of the inductance value in magnetic field process to reduce described electric energy transmitting coil;
Described secondary shielding layer is positioned under the first screen, to shield the magnetic field through described first screen, and protection power consumption equipment.
Further, the hollow area of described first screen is positioned at the center of described first screen, and described solid area is positioned at the surrounding of described first screen, to surround described hollow area.
Further, described electric energy receiving coil is positioned on the solid area of described first screen.
Further, described hollow area is positioned at the centre position of described first screen, and described solid area is positioned at two side positions of described first screen, to be distributed in the both sides of described hollow area,
Further, described hollow area is equal with the length of described solid area.
Further, the magnetic sheet of setting size is placed in the end positions symmetry of described hollow area, to increase the area of described solid area.
Further, described solid area is positioned at four end Angle Position of described first screen, and described hollow area is positioned at the rest position of described first screen.
Further, the magnetic sheet of at least one setting size is placed in described hollow area position, to increase the area of described solid area.
From the above, according to a kind of electro-magnetic screen layer of the utility model and the wireless electric energy transmission device with electro-magnetic screen layer, by the first screen (i.e. magnetic sheet layer) being set to hollow area and solid area combines, because in hollow area, the magnetic resistance of air is greater than the magnetic resistance of magnetic sheet, like this, the high frequency magnetic field magnetic line of force of former edge emitting coil excitation is not easy to pass through hollow area, the inductance value of the transmitting coil on former limit in the course of the work can be made to be not easy to be subject to the variable effect of magnetic resistance, and inductance value keeps stable; Meanwhile, at the lower zone of receiving coil, magnetic sheet is set as far as possible, to ensure the efficient coupling of receiving coil and transmitting coil, improves efficiency of transmission.Electro-magnetic screen layer of the present utility model, by individual layer and the double-deck shielding mode combined, effectively can reduce the impact of magnetic sheet on transmitting coil inductance value, improve system transfers efficiency.
Accompanying drawing explanation
It is the schematic block diagram of magnetic resonance type wireless electric energy transmission device described in Fig. 1;
Figure 2 shows that the schematic diagram of electromagnetic armouring structure in prior art;
Figure 3 shows that the field circuit schematic diagram according to structure in Fig. 2;
Figure 4 shows that the structure chart of the first embodiment according to electromagnetic armouring structure of the present utility model;
Figure 5 shows that the field circuit schematic diagram according to structure shown in Fig. 4;
Figure 6 shows that the structure chart of the second embodiment according to electromagnetic armouring structure of the present utility model;
Figure 7 shows that the structure chart of the 3rd embodiment according to electromagnetic armouring structure of the present utility model;
Figure 8 shows that the structure chart of the 4th embodiment according to electromagnetic armouring structure of the present utility model;
Figure 9 shows that the structure chart of the 5th embodiment according to electromagnetic armouring structure 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 the utility model embodiment, described electromagnetic armouring structure is applied in wireless electric energy transmission device, described wireless electric energy transmission device includes electric energy transmitting terminal and electric energy receiving terminal, described electric energy transmitting terminal comprises electric energy transmitting coil, and described electric energy transmitting coil receives alternating voltage to be converted to high-frequency emission magnetic field; Described electric energy receiving terminal draws together electric energy receiving coil and electro-magnetic screen layer, and described electric energy receiving coil responds to described high-frequency emission magnetic field to obtain corresponding high frequency voltage, and described high frequency voltage obtains suitable output voltage supply power consumption equipment after rectifying and wave-filtering process; Described electro-magnetic screen layer is positioned between described electric energy receiving coil and power consumption equipment, to shield the interference of high-frequency emission magnetic field to power consumption equipment.
For ensureing the optimization of Energy Transfer, former edge emitting coil Ls is set to consistent with the operating frequency of system with the resonance frequency of resonant capacitance Cs, when former edge emitting coil and secondary receiving coil distant, the inductance value of transmitting coil can not change because of the interference of electro-magnetic screen layer, and when former edge emitting coil and secondary receiving coil close together, because the magnetic resistance of magnetic sheet is lower, the flux loop of high frequency magnetic field shortens, the inductance value of former edge emitting coil is increased, former edge emitting coil and resonance capacitor resonance frequency departure system operating frequency, influential system efficiency of transmission.
Electro-magnetic screen layer in the utility model embodiment comprises the first screen and secondary shielding layer, described first screen is positioned under described receiving coil, described secondary shielding layer is positioned between described first screen and power consumption equipment, with the magnetic field of shielding through described first screen, protect power consumption equipment further; Here, described first screen is for ferrite magnetic lamella, and secondary shielding layer is for copper sheet layer, and described first screen and secondary shielding layer combine in the mode adhered to.
Be illustrated in figure 4 the structure chart of the first embodiment according to electromagnetic armouring structure of the present utility model, described magnetic sheet layer comprises by hollow area 1 and solid area 2, and, described hollow area 1 is positioned at the center of described magnetic sheet layer, described solid area 2 is positioned at the surrounding of described magnetic sheet, to surround described hollow area 1.In the present embodiment, described receiving coil is positioned on the solid area 2 of described magnetic sheet layer.
With reference to the field circuit schematic diagram that Figure 5 shows that structure shown in Fig. 4, in hollow area position, because air reluctance is greater than the magnetic resistance of magnetic sheet, therefore, the high frequency magnetic field of transmitting coil is not easy to form low-resistance loop by hollow area, thus decrease transmitting coil magnetic field occur flux loop shorter situation, the inductance value of former edge emitting coil can not produce larger variation because of the change of flux loop, the resonance frequency of former limit resonance structure can maintain system operating frequency or skew is very little, and the impact of delivery of electrical energy efficiency is little.On the other hand, because electric energy receiving coil is positioned on described solid area, therefore, electric energy transmitting coil and electric energy receiving coil still can keep good magnetic Field Coupling, and efficiency of transmission is high.
According to the electromagnetic armouring structure of above-described embodiment, by electro-magnetic screen layer being set to the mode that individual layer (hollow area is copper sheet layer single-layer shield) and bilayer (solid area is magnetic sheet layer and copper sheet layer double layer screen) combine, no matter when transmitting coil distance receiving coil far or nearer, can keep former edge emitting coil and resonance capacitor resonance under system operating frequency, energy transmission efficiency is high, and shield effectiveness is good.
With reference to the structure chart that Figure 6 shows that the second embodiment according to electromagnetic armouring structure of the present utility model, Fig. 6 be on the basis of Fig. 4 the low magnetic sheet layer of an enterprising step-down on the impact of transmitting coil inductance value, as shown in Figure 6, described hollow area 1 is positioned at the centre position of described magnetic sheet layer, described solid area 2 is positioned at two side positions of described magnetic sheet layer, to be distributed in the both sides of described hollow area 1, and described hollow area 1 is equal with the length of described solid area 2.
Structure chart according to Fig. 6, the high frequency magnetic field of transmitting coil not easily passs through hollow area 1, then transmitting coil flux loop in transmitting magnetic field process does not have that great changes will take place, therefore, the inductance value of transmitting coil also can not change, relative to the embodiment shown in Fig. 4, the inductance value change that obviously can reduce transmitting coil of the utility model embodiment, resonance effect is better.
Equal for the length of hollow area and solid area in Fig. 6; those skilled in the art are known, and under the derivation of above-described embodiment, the width that can also arrange hollow area and solid area is equal; it has same technique effect, all within protection range of the present utility model.
But the embodiment shown in Fig. 6, owing to not placing magnetic sheet below part receiving coil, the coupling of receiving coil and transmitting coil can be affected, therefore, utility model people increases the area of solid area on this basis further, the structure chart of the 3rd embodiment according to electromagnetic armouring structure of the present utility model as shown in Figure 7, the present embodiment further increases the position of magnetic sheet on the basis being the embodiment shown in Fig. 6, the magnetic sheet of setting size is placed in the end positions symmetry of described hollow area 1, as the solid area 2 ' in Fig. 7, to increase the area of described solid area 2.
Obviously, owing to being provided with the magnetic sheet that more multiaspect is long-pending below receiving coil, then can there is better coupling in receiving coil and transmitting coil, makes radio transmission efficiency be able to further raising.
With reference to the structure chart that Figure 8 shows that the 4th embodiment according to electromagnetic armouring structure of the present utility model, in the present embodiment, described solid area 2 is positioned at four end Angle Position of described magnetic sheet layer, as the position of the left upper end in Fig. 8, lower-left end, upper right side and bottom righthand side, described hollow area 1 is positioned at the rest position of described magnetic sheet layer.Same, the high frequency magnetic field of the transmitting coil in the present embodiment not easily passs through hollow area 1, larger change can not be there is in the inductance value of transmitting coil, and compared to above-mentioned several execution mode, in the present embodiment, transmitting coil and receiving coil from diverse location near time, effectively can reduce the inductance value change of transmitting coil, at utmost to stablize the inductance value of transmitting coil, guarantee that former limit resonance frequency is consistent with system operating frequency.
In like manner, although the embodiment shown in Fig. 8 can be good at the inductance value of stable transmitting coil, but because its magnetic sheet hollow area is more, make the coupling performance of transmitting coil and receiving coil poor, therefore, utility model people adds solid area area on this basis, be illustrated in figure 9 the structure chart of the 5th embodiment according to electromagnetic armouring structure of the present utility model, on basis embodiment illustrated in fig. 8, the magnetic sheet of at least one setting size is put in described hollow area position, to increase the area of described feasible region 2 in the present embodiment.As added four solid area 2 ' in Fig. 9, those skilled in the art are known, can increase solid area quantity and size, do not do concrete restriction to this according to the designing requirement of circuit.Embodiment shown in Fig. 9 can improve the coupling of receiving coil and transmitting coil, makes radio transmission efficiency be able to further raising.
According to the description of above-mentioned each embodiment to electro-magnetic screen layer, electro-magnetic screen layer of the present utility model is by being set to engraved structure by magnetic sheet layer, effectively can reduce magnetic sheet layer to the impact of launching high frequency magnetic field, reduce the inductance value change of transmitting coil, make former limit resonance structure can maintain system operating frequency resonance, and electric energy transmitting coil and receiving coil still can keep good magnetic Field Coupling, energy transmission efficiency is high, and, the structure that electro-magnetic screen layer of the present utility model is combined by double-deck and individual layer can very well shielding space electromagnetic field to the interference of power consumption equipment, can effectively reduce costs, effective.
Those skilled in the art are known, and above-mentioned electro-magnetic screen layer also can be applicable to other occasions needing spatial electromagnetic field shield, can at utmost improve delivery of electrical energy efficiency while protection power consumption equipment.
Detailed description has been carried out above to according to the electro-magnetic screen layer of preferred embodiment of the present utility model and the wireless electric energy transmission device with electro-magnetic screen layer; 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 (13)
1. an electro-magnetic screen layer, in order to the interference of shielding space magnetic field to power consumption equipment, is characterized in that, comprise,
First screen, comprises the magnetic shield be made up of hollow area and solid area;
Secondary shielding layer, is positioned under the first screen, to shield the magnetic field through described first screen, and protection power consumption equipment;
Wherein, described hollow area is in order to increase the magnetic resistance of described space magnetic field.
2. electro-magnetic screen layer according to claim 1, is characterized in that, the hollow area of described first screen is positioned at the center of described first screen, and described solid area is positioned at the surrounding of described first screen, to surround described hollow area.
3. electro-magnetic screen layer according to claim 1, is characterized in that, described hollow area is positioned at the centre position of described first screen, and described solid area is positioned at two side positions of described first screen, to be distributed in the both sides of described hollow area,
Further, described hollow area is equal with the length of described solid area.
4. electro-magnetic screen layer according to claim 3, is characterized in that, places the magnetic sheet of setting size, to increase the area of described solid area in the end positions symmetry of described hollow area.
5. electro-magnetic screen layer according to claim 1, is characterized in that, described solid area is positioned at four end Angle Position of described first screen, and described hollow area is positioned at the rest position of described first screen.
6. electro-magnetic screen layer according to claim 5, is characterized in that, places the magnetic sheet of at least one setting size, to increase the area of described solid area in described hollow area position.
7. there is a wireless electric energy transmission device for magnetic field shielding layer, it is characterized in that, comprising:
Electric energy transmitting terminal, comprises electric energy transmitting coil, and described electric energy transmitting coil receives alternating voltage to be converted to high-frequency emission magnetic field;
Electric energy receiving terminal, comprises electric energy receiving coil and electro-magnetic screen layer, and described electric energy receiving coil responds to described high-frequency emission magnetic field to obtain corresponding high frequency voltage, and described high frequency voltage obtains output voltage supply power consumption equipment after rectifying and wave-filtering process;
Described electro-magnetic screen layer is positioned between described electric energy receiving coil and power consumption equipment, and described electro-magnetic screen layer comprises the first screen and secondary shielding layer,
Described first screen comprises the magnetic shield be made up of hollow area and solid area, and described hollow area, in order to increase the magnetic resistance in described high-frequency emission magnetic field, is launching the change of the inductance value in magnetic field process to reduce described electric energy transmitting coil;
Described secondary shielding layer is positioned under the first screen, to shield the magnetic field through described first screen, and protection power consumption equipment.
8. wireless electric energy transmission device according to claim 7, is characterized in that, the hollow area of described first screen is positioned at the center of described first screen, and described solid area is positioned at the surrounding of described first screen, to surround described hollow area.
9. wireless electric energy transmission device according to claim 8, is characterized in that, described electric energy receiving coil is positioned on the solid area of described first screen.
10. wireless electric energy transmission device according to claim 7, is characterized in that, described hollow area is positioned at the centre position of described first screen, and described solid area is positioned at two side positions of described first screen, to be distributed in the both sides of described hollow area,
Further, described hollow area is equal with the length of described solid area.
11. wireless electric energy transmission devices according to claim 10, is characterized in that, place the magnetic sheet of setting size, to increase the area of described solid area in the end positions symmetry of described hollow area.
12. wireless electric energy transmission devices according to claim 7, is characterized in that, described solid area is positioned at four end Angle Position of described first screen, and described hollow area is positioned at the rest position of described first screen.
13. wireless electric energy transmission devices according to claim 12, is characterized in that, place the magnetic sheet of at least one setting size, to increase the area of described solid area in described hollow area position.
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| CN201520696004.8U CN205142776U (en) | 2015-09-09 | 2015-09-09 | Electromagnetic shield layer and have electromagnetic shield layer's wireless power transmission device |
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| CN201520696004.8U CN205142776U (en) | 2015-09-09 | 2015-09-09 | Electromagnetic shield layer and have electromagnetic shield layer's wireless power transmission device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050372A (en) * | 2015-09-09 | 2015-11-11 | 宁波微鹅电子科技有限公司 | Electromagnetic shielding layer and wireless power transmission device with same |
| CN107346918A (en) * | 2016-05-06 | 2017-11-14 | 宁波微鹅电子科技有限公司 | A kind of wireless electric energy transmission device |
| CN109149793A (en) * | 2018-08-22 | 2019-01-04 | 上海电力学院 | Sink type magnet shielding structure and plate coil radio energy transmission system including it |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
| US11018527B2 (en) | 2018-08-09 | 2021-05-25 | Ningbo Weie Electronics Technology Ltd. | Wireless power supply assembly and electronic device |
| US11062841B2 (en) | 2017-12-05 | 2021-07-13 | Ningbo Weie Electronics Technology Ltd. | Electromagnetic shield device, wireless charging transmitting terminal, wireless charging receiving terminal and system |
-
2015
- 2015-09-09 CN CN201520696004.8U patent/CN205142776U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050372A (en) * | 2015-09-09 | 2015-11-11 | 宁波微鹅电子科技有限公司 | Electromagnetic shielding layer and wireless power transmission device with same |
| CN107346918A (en) * | 2016-05-06 | 2017-11-14 | 宁波微鹅电子科技有限公司 | A kind of wireless electric energy transmission device |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
| US11062841B2 (en) | 2017-12-05 | 2021-07-13 | Ningbo Weie Electronics Technology Ltd. | Electromagnetic shield device, wireless charging transmitting terminal, wireless charging receiving terminal and system |
| US11018527B2 (en) | 2018-08-09 | 2021-05-25 | Ningbo Weie Electronics Technology Ltd. | Wireless power supply assembly and electronic device |
| CN109149793A (en) * | 2018-08-22 | 2019-01-04 | 上海电力学院 | Sink type magnet shielding structure and plate coil radio energy transmission system including it |
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