CN201947065U - Proximate wireless power transmission device structure - Google Patents
Proximate wireless power transmission device structure Download PDFInfo
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- CN201947065U CN201947065U CN2010205631229U CN201020563122U CN201947065U CN 201947065 U CN201947065 U CN 201947065U CN 2010205631229 U CN2010205631229 U CN 2010205631229U CN 201020563122 U CN201020563122 U CN 201020563122U CN 201947065 U CN201947065 U CN 201947065U
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Abstract
The utility model provides a proximate wireless power transmission device structure, which is characterized by comprising four necessary parts, namely an open type excitation coil, a baffle board, a receiving coil and a flat-can shaped magnetic core, wherein the receiving coil is fixed in a groove of the flat-can shaped magnetic core to form a receiver; the baffle board and the receiver are respectively arranged on the two sides of the open type excitation coil; and the baffle board with an area larger than the excitation coil is fixed with the open type excitation coil at a certain interval. The proximate wireless power transmission device structure is suitable for proximate non-contact miniwatt power transmission, and can be applied to portable small size electronic devices and power transmission situations where a conductor contact manner is unfavorable to be adopted.
Description
One. technical field
The content that the utility model relates to should belong to the low-voltage power supply technical field, is that a kind of high-frequency impulse that utilizes is realized touchless power transmitting device, and is closely related with switch power technology.Can be used for being not suitable for adopting the directly occasion of transmission of electricity of lead, as the transmission of electricity inside and outside the closed container etc.
Two. background technology
Traditional power delivery is to utilize conductor to connect to realize, for alternating current, comprises also and adopt incorporate transformer to carry out power delivery that the contact of all serving a ball power transmission mode always has conductor interconnective between network.Satisfy the transmission of electricity requirement fully for most of occasion tradition power transmission modes.But adopt the electric wire connected mode to have some inconvenient parts, the transmission of electricity inside and outside, the electronic equipment in the implantable bioartificial body, and the charging of equipment such as mobile phone, notebook computer, portable power free electronic equipment etc. as closed container for some power consumption equipment.As long as if use instead near the no contact power transmission mode that just can transmit electricity, the heart can bring in the use surely and be convenient greatly.Obtained extensive use at present in contactless card-punching system, just the electric energy that can carry of this system is very small.
In view of the convenience that radio energy is carried, present many technical staff begin to explore various technological means, improve its transmitted power, transmission distance etc. as far as possible.One of them is to convert electric energy to magnetic field energy, is radiated to the recipient, converts magnetic energy to electric energy again.Contactless card-punching system relies on these means to be achieved exactly, is a kind of effective mode.But electromagnetic field becomes opening mode after losing electric conductor, magnetic conductor constraint, and the efficient of transmission of electricity reduces, and also can cause serious space electromagnetic interference simultaneously.After particularly transmitted power strengthens, need emphasis to consider to reduce the measure of space electromagnetic interference.Electromagnetic interference source mainly comes from the conversion equipment between electricity and the magnetic, and therefore, the structure of electromagnetic energy conversion, conveying device is effectively to realize wireless transmission of electricity key point.
Necessarily have magnetic field to produce around the current-carrying coil, the radiation scope in its magnetic field is directly proportional with the excitation coil size.The magnetic line of force of independent air core coil on coil plane distributes even substantially; Near more apart from coil, the magnetic line of force is close more, and magnetic field intensity is high more; Far away more apart from coil, the magnetic line of force is thin more, and magnetic field intensity is more little.In order to improve transmission range, generally adopt the transverse magnetic field coupling, the yardstick in its formation magnetic field of extending simultaneously, its principle is as shown in Figure 1.In this mode, magnetic field coupling amount is less, and the electromagnetic interference especially severe.In order to limit the electromagnetic interference degree, can adopt the longitudinal magnetic field coupled modes, its principle is as shown in Figure 2.For radius is the magnetic field of the air core coil institute radiation of R, can be calculated by following formula in the magnetic induction density B at distance coil x place.As seen, along with distance x increases, the magnetic flux density decay is very fast.
When distance x is smaller, can obtain many magnetic field coupling amounts, but this mode also can only be done in-plant electric energy transmitting, be fit to press close to formula transmission of electricity occasion.
Three. summary of the invention
In wireless power transmission mode, improve power transmission efficiency, the magnetic line of force that the magnetic field radiation coil is produced passes through receiving coil as much as possible.Radiation field utilizes fully more, and is also just more little to the electromagnetic interference in space.The utilance that improves radiation field is a key problem.In order to reach this purpose, the technical scheme that the utility model adopted is: magnetic field coil adopts wide-open structure, form by open excitation coil, reflecting plate, receiving coil, four necessary parts of flat jar of type magnetic core, receiving coil is fixed in the flat jar of type magnetic core groove forms receiver, the be placed in both sides of open excitation coil of reflecting plate and receiver, wherein area is fixed together greater than the alternate certain distance with open excitation coil of reflecting plate of excitation coil, as shown in Figure 3.The three-dimensional model of its whole composition structure as shown in Figure 4.
This technical finesse scheme is based in the open-flux path, and the magnetic line of force always passes through along the path of minimum reluctance.The Distribution of Magnetic Field that open coil itself produces substantially all claims, in the space of being close to excitation coil, must exist the short magnetic line of force in path to distribute, and these magnetic lines of force can not pass through receiver, power delivery are not had effect, as shown in Figure 2.Be directed to the longitudinal magnetic field coupled modes, after the receiving coil outside installs magnetic core additional, magnetic line of force distribution changed to some extent.Because the magnetic permeability height of FERRITE CORE, magnetic resistance is little, in the magnetic field that excitation coil produced, can have the more magnetic line of force to form the loop through this magnetic core.Just this magnetic core plays the effect of collecting the magnetic line of force.After the receiving coil outside added magnetic core, magnetic line of force distribution as shown in Figure 5.Equally, settle a little magnetic core again in the excitation coil center, can help increasing the proportional numbers of the magnetic line of force that passes through receiving coil, but this little magnetic core be less to entire effect, is inessential parts with magnetic line of force distribution density to the guiding of hub of a spool place.
Be arranged on the acting as of reflector at the excitation coil back side: after excitation coil pulsed magnetic field radiation overleaf arrives good conductor, in conductor, just induce current vortex, this current vortex produces new magnetic field, offset original magnetic field radiation, make the electromagnetic field of high frequency to be difficult to pass through good conductor, reach the purpose that stops back side electromagnetic radiation like this.The electric conductivity of reflector is good more, and the loss of its current vortex is also more little.Therefore, reflector adopts good conductor materials such as copper, aluminium sheet, generally adopts scale copper, and needs enough thickness.Real material thickness l and driving pulse frequency dependence, calculate according to the penetration depth formula of electromagnetic wave in electric conductor:
ρ is the conductor resistance rate in the formula, is the unit substitution with Ω cm; μ
rBe the conductor relative permeability; F is alternating magnetic field frequency (Hz).For copper product, ρ=1.7 * 10
-6(Ω cm), μ
r=0.9999, when f=100kHz, should be as the scale copper thickness of reflector greater than 0.2mm.When f=50kHz, should be as the scale copper thickness of reflector greater than 0.4mm.In the design, the area requirements of reflecting plate is obviously greater than the area of excitation coil.
Must leave gap d between reflector and the excitation coil, to guarantee the magnetic field have enough spatial distribution excitation coils to be produced.Gap d should increase to some extent with the increase of coil diameter, generally should be greater than 5mm.If gap d is too small, can suppress the ability that excitation coil produces magnetic field, reduce the performance number of carrying.Consider that from magnetic circuit magnetic resistance aspect too small gap d can increase the magnetic resistance of magnetic circuit, reduce the inductance value of excitation coil.
Profile of the present utility model is flat thin type, and volume is less, helps reducing the volume of wireless power transmitting device.
The beneficial effects of the utility model are, pulsed magnetic field distributes relatively concentrated, and pulsed magnetic field coupling amount is relatively large, can realize bigger transmission power, have two borders of less external electromagnetic field radiation, particularly reflecting plate and receiving terminal magnetic core with the electromagnetic interference of the external space a little less than.
Four. description of drawings
Fig. 1 is transverse magnetic field coupling principle figure.
Fig. 2 is transverse magnetic field coupling principle figure.
Fig. 3 is the utility model structural representation.
1. pulsed magnetic field reflecting plates among the figure, 2. magnetic field coil, 3. magnetic field receiving coil, 4. flat jar of type magnetic core of receiving terminal.
Fig. 4 is magnetic field radiation device and a receiver layout stereoscopic model in the utility model device.
1. pulsed magnetic field reflecting plates among the figure, 2. magnetic field coil, 3. magnetic field receiving coil, 4. flat jar of type magnetic core of receiving terminal.
Fig. 5 is the utility model device Distribution of Magnetic Field view.
Fig. 6 is the utility model device magnetic field receiver application example.
Five. embodiment
The utility model divides makes two individual components: pulsed magnetic field exciter and receiver, see accompanying drawing 4.
The pulsed magnetic field exciter is made of the little magnetic core three at pulsed magnetic field radial coil, pulsed magnetic field reflecting plate, coil middle part.Use the insulating bodies that does not influence Distribution of Magnetic Field to be fixed between pulsed magnetic field radial coil, reflecting plate, the little magnetic core three, generally make concentric structure.The size of pulsed magnetic field radial coil is determined that by actual needs coil diameter is more preferably greater than 5 times of coupling distance, and the pulsed magnetic field reflection plate material can be taken the thick above copper sheet of 0.5mm, also can adopt good conductor materials such as aluminium sheet.When the pulsed magnetic field frequency was higher, the reflecting plate surface can adopt method such as silver-plated to increase its conductive capability, reduces the wastage.The size of reflecting plate is greater than the size of excitation coil, and the gap between coil and magnetic field reflecting plate should be greater than 5mm.The little magnetic core of hub of a spool generally adopts Ferrite Material, and relative permeability is not less than 2000, and the thickness of its thickness and coil is suitable, and diameter is less than below 1/4th of coil diameter.The packaging material size of radiation end face is with Bao Weihao, and surface treatment is smooth.Exciting circuit can place the back side of reflecting plate.
The two constitutes the pulsed magnetic field receiver by receiving coil, flat jar type magnetic core, and coil places in the middle of jar groove of type magnetic core.Receiving coil is wound on earlier on the coil rack, fixes with magnetic core again.The diameter of receiving coil is suitable with the magnetic field radiation coil.Core material is generally selected ferrite for use, also can be other high frequency high permeability materials.Accompanying drawing 6 is samples of the utility model receiver.Voltage follower circuit can place the back side of magnetic core.
The utility model is only determined size and relative position, and the parameters such as the number of turn of two coils are by the requirement decision of exciting circuit.Be noted that the adding owing to the magnetic field reflecting plate, the inductance value of relative its air core coil of the inductance value of magnetic field coil is little, need suitably increase the number of turn when coiling.For the strong magnetic field radianting capacity, should more than 50kHz, be excellent with the frequency height to the pulse current frequency that excitation coil applied.
Claims (1)
1. press close to the wireless power transmitting device structure of formula for one kind, has following feature: form by open excitation coil, reflecting plate, receiving coil, four necessary parts of flat jar of type magnetic core, receiving coil is fixed in the flat jar of type magnetic core groove forms receiver, the be placed in both sides of open excitation coil of reflecting plate and receiver, wherein area is fixed together greater than the alternate certain distance with open excitation coil of reflecting plate of excitation coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205631229U CN201947065U (en) | 2010-10-18 | 2010-10-18 | Proximate wireless power transmission device structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205631229U CN201947065U (en) | 2010-10-18 | 2010-10-18 | Proximate wireless power transmission device structure |
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| CN201947065U true CN201947065U (en) | 2011-08-24 |
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| CN2010205631229U Expired - Fee Related CN201947065U (en) | 2010-10-18 | 2010-10-18 | Proximate wireless power transmission device structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400682A (en) * | 2013-08-14 | 2013-11-20 | 广西电网公司电力科学研究院 | Magnetic core structure and electromagnetic coupling device based on magnetic core structure |
| CN103947072A (en) * | 2011-09-07 | 2014-07-23 | 奥克兰联合服务有限公司 | Magnetic field shaping for inductive power transfer |
| CN103988269A (en) * | 2011-12-12 | 2014-08-13 | 威德米勒界面有限公司及两合公司 | plug device for contact-free inductive energy transfer and operating method for the plug device |
| CN104023512A (en) * | 2014-05-30 | 2014-09-03 | 西安理工大学 | Magnetic leakage field shield method of wireless electric energy transmission system |
| CN104134526A (en) * | 2014-06-27 | 2014-11-05 | 青岛众海汇智能源科技有限责任公司 | Annular coil structure |
| CN110415923A (en) * | 2019-08-15 | 2019-11-05 | 西安深维智能科技有限公司 | A kind of underwater efficient coupling power-feed connector structure |
-
2010
- 2010-10-18 CN CN2010205631229U patent/CN201947065U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103947072A (en) * | 2011-09-07 | 2014-07-23 | 奥克兰联合服务有限公司 | Magnetic field shaping for inductive power transfer |
| CN103988269A (en) * | 2011-12-12 | 2014-08-13 | 威德米勒界面有限公司及两合公司 | plug device for contact-free inductive energy transfer and operating method for the plug device |
| CN103400682A (en) * | 2013-08-14 | 2013-11-20 | 广西电网公司电力科学研究院 | Magnetic core structure and electromagnetic coupling device based on magnetic core structure |
| CN104023512A (en) * | 2014-05-30 | 2014-09-03 | 西安理工大学 | Magnetic leakage field shield method of wireless electric energy transmission system |
| CN104023512B (en) * | 2014-05-30 | 2017-01-11 | 西安理工大学 | Magnetic leakage field shield method of wireless electric energy transmission system |
| CN104134526A (en) * | 2014-06-27 | 2014-11-05 | 青岛众海汇智能源科技有限责任公司 | Annular coil structure |
| CN110415923A (en) * | 2019-08-15 | 2019-11-05 | 西安深维智能科技有限公司 | A kind of underwater efficient coupling power-feed connector structure |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20131018 |