CN113839468A - Wireless charging coupling coil for segmented resonance of electric automobile - Google Patents
Wireless charging coupling coil for segmented resonance of electric automobile Download PDFInfo
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- CN113839468A CN113839468A CN202111094685.7A CN202111094685A CN113839468A CN 113839468 A CN113839468 A CN 113839468A CN 202111094685 A CN202111094685 A CN 202111094685A CN 113839468 A CN113839468 A CN 113839468A
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- 230000008878 coupling Effects 0.000 title claims abstract description 92
- 238000010168 coupling process Methods 0.000 title claims abstract description 92
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 92
- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 230000011218 segmentation Effects 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention discloses a segmented resonance wireless charging coupling coil of an electric automobile, wherein the coupling coil is wound outwards and inwards, the coupling coil is divided into N sections, the wire inlet end is connected with a first capacitor, an ith compensation capacitor is connected between an i-1 section of coupling coil and an ith section of coupling coil, and i is more than or equal to 2 and less than or equal to N; the ith section of coupling coil resonates with the ith compensation capacitor. Each segmented coil is provided with a series compensation capacitor for resonance compensation. This electric automobile wireless charging coupling coil passes through the coupling coil segmentation back, can realize that every section coil voltage of system diminishes, diminishes at aluminum plate's displacement current, and aluminum plate's induced voltage diminishes, and the electromagnetism is harassed and is reduced to guarantee the wireless charging system safe operation of electric automobile.
Description
Technical Field
The invention relates to the technical field of positioning methods, in particular to a segmented resonance wireless charging coupling coil for an electric vehicle.
Background
In recent years, an electromagnetic coupling resonant wireless energy transmission technology is rapidly developed as a new wireless energy transmission technology, can realize long-distance and high-power energy transmission, is very suitable for wireless charging of electric automobiles, and can realize unmanned charging and mobile charging on the premise of meeting the driving mileage of automobile owners. In the wireless charging mode, the transmitting coil and the receiving coil are respectively arranged under the ground and in the chassis of the automobile, the energy transmitting device is completely isolated from the energy receiving device, energy is transmitted through an air gap between the transmitting coil and the receiving coil, and the automobile can start to be charged after the transmitting coil and the receiving coil are aligned when the automobile runs. The charging device does not need manual plugging and unplugging during charging, is convenient and safe to use, does not have exposed wires, and does not have the problems of spark and the like caused by factors such as line aging and point discharge. The charging mode of the electric automobile in the future mainly takes wireless charging as the main mode.
Although wireless charging has unique advantages which are not possessed by the traditional wired power supply technology, in fact, a plurality of problems need to be solved, wherein one of the problems is that the wireless charging system is disturbed by electromagnetism outside the system. In addition, a strong magnetic field exists in the middle of the coil, the electromagnetic exposure is influenced, and the human health is endangered.
At present, the difficulty of directly measuring a magnetic field is high, and no good method exists for detecting and eliminating higher harmonics.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the segmented resonance wireless charging coupling coil for the electric automobile, which can realize that the voltage of each segment of the coil of the system is reduced, the displacement current of an aluminum plate is reduced, the induction voltage of the aluminum plate is reduced, and the electromagnetic disturbance is reduced after the coupling coil is segmented, so that the safe operation of the wireless charging system for the electric automobile is ensured.
In order to achieve the aim, the invention provides a segmented resonance wireless charging coupling coil for an electric vehicle, wherein the coupling coil is wound outwards and inwards, the coupling coil is divided into N segments, the wire inlet end is connected with a first capacitor, an ith compensation capacitor is connected between an i-1 segment of the coupling coil and an ith segment of the coupling coil, and i is more than or equal to 2 and less than or equal to N;
the ith section of coupling coil resonates with the ith compensation capacitor.
Providing another electric vehicle segmented resonance wireless charging coupling coil, wherein the coupling coil is wound outwards and inwards, the coupling coil is divided into N segments, an ith compensation capacitor is connected between the ith segment of coupling coil and the (i + 1) th segment of coupling coil, and i is more than or equal to 1 and less than or equal to N-1; the outlet end is connected with the Nth capacitor;
the ith section of coupling coil resonates with the ith compensation capacitor.
Further, the setting of the voltage peak value Vp, N at the two ends of the coupling coil satisfies: Vp/N is less than or equal to 500V.
Further, the coupling coil is divided into N sections for sharing.
Further, the coupling coil is divided into N sections which are not equally divided.
Further, the distance between the i-1 th section of coupling coil and the i-th section of coupling coil is not more than 20 mm.
Further, the distance between the ith segment of coupling coil and the (i + 1) th segment of coupling coil is not more than 20 mm.
Further, the respective compensation capacitors are arranged inside or outside the coupling coil.
Further, the total inductance value of the series connection of the coupling coils after the division is equal to that before the division.
The technical scheme of the invention has the following beneficial technical effects:
according to the invention, after the coupling coil is designed in a segmented manner, the voltage of each segment of the coil of the system is reduced, the displacement current of the aluminum plate is reduced, the induction voltage of the aluminum plate is reduced, and the electromagnetic disturbance is reduced, so that the safe operation of the wireless charging system of the electric automobile is ensured.
Drawings
Fig. 1 is a schematic diagram of a conventional wireless charging principle;
FIG. 2 is a schematic diagram of the charging principle of one embodiment of the present invention;
FIG. 3 is a schematic diagram of a segmented coil configuration of an embodiment;
FIG. 4 is a schematic diagram of the charging principle of another embodiment of the present invention;
fig. 5 is a schematic diagram of a segmented coil structure of yet another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
At present, the most common compensation method is to add a capacitor to form a resonance compensation structure with the self-inductance leakage inductance of the coil, which is shown in fig. 1. The wireless charging system of the electric vehicle usually adopts a mode of serially connecting a capacitor and a coupling coil for compensation. Because the working voltage of the coupling coil of the wireless charging system of the electric automobile is higher, the electromagnetic disturbance is larger, and in order to reduce the induction voltage, a sectional type compensation scheme is adopted, so that the voltage of the coupling coil and the series compensation capacitor is reduced.
The invention provides a segmented resonance wireless charging coupling coil for an electric automobile, aiming at reducing electromagnetic disturbance of a coupling mechanism part of a wireless charging system to the outside of the system and solving the problem of higher working voltage of the coil.
The coupling coil is wound outwards and inwards clockwise or anticlockwise, the coupling coil is divided into N sections, the wire inlet end is connected with a first capacitor, an ith compensation capacitor is connected between the i-1 section of the coupling coil and the ith section of the coupling coil, and i is more than or equal to 2 and less than or equal to N; the ith section of coupling coil resonates with the ith compensation capacitor.
On the other hand, a mode that an outlet end is connected with a capacitor can also be adopted, the coupling coil is wound outwards and inwards, the coupling coil is divided into N sections, an ith compensation capacitor is connected between the ith section of coupling coil and the (i + 1) th section of coupling coil, and i is more than or equal to 1 and less than or equal to N-1; the outlet end is connected with the Nth capacitor; the ith section of coupling coil resonates with the ith compensation capacitor.
The voltage peak value Vp and N at two ends of each section of coupling coil are set up to satisfy the following conditions: Vp/N is less than or equal to 500V. Each segmented coil is provided with a series compensation capacitor for resonance compensation, and N series compensation capacitors are provided in total. For the traditional direct series resonance of the compensation capacitor and the coupling coil, the resonance relation is satisfied, after segmentation, the resonance relation is also satisfied by each series compensation capacitor and each segmented coil, the capacitance value is N times of the original capacitance value, and the voltage of each segment of coil is changed into 1/N of the original voltage.
Further, the coupling coil is divided into N sections, and an equal division mode can be adopted. For the condition that the coupling coil is divided into N sections and the self-inductance values of the coils of the sections are different, the capacitors corresponding to the capacitance values are matched according to the self-inductance of the actual coil after the sections are segmented, the series compensation capacitors and the segmented coils also meet the resonance relation, and the compensation capacitors can be arranged inside or outside the coupling coil.
Furthermore, in order to ensure the voltage resistance and the insulation of the coil, a litz wire with a proper specification is selected, and the distance between the tail end of the wire section and the head end of the next wire section to be supported does not exceed 20 mm.
Example 1
Taking the self-inductance values of the segmented coils as an example, as shown in fig. 2, the coils are divided into 4 segments, and the inductance values of the coils in each segment are the same, i.e., the lengths of the windings of the coils in each segment are the same, S is the incoming end, F is the outgoing end, C1-C4 are series compensation capacitors, and D1-D7 are the end points of the segments.
The coil is wound clockwise from outside to inside, D7 is a starting point connected with an external circuit, a series capacitor C1 is connected to an incoming end S of the coil, a first conducting wire enters from the end S and is wound clockwise to a tail end D1 for division, a second conducting wire is wound clockwise from a head end D2 to a tail end D3 for division, a third conducting wire is wound clockwise from a head end D4 to a tail end D5 for division, a fourth conducting wire is wound clockwise from a head end D6 to an innermost ring and is wound to an outgoing end F for division, and an end F is connected with the external circuit. The capacitor C2 is connected in series between the tail end D1 of the first wire and the head end D2 of the second wire, the capacitor C3 is connected in series between the tail end D3 of the second wire and the head end D4 of the third wire, and the capacitor C4 is connected in series between the tail end D5 of the third wire and the head end D6 of the fourth wire.
The capacitance values of the capacitors C1-C4 can resonate with the inductance values of the four sections of conducting wires respectively, if the inductance values of the four sections of conducting wires are the same, the capacitance values of the four capacitors are the same, and the same capacitor design can be adopted.
Example 2
The capacitor may also be connected to the outlet terminal as shown in fig. 4.
Referring to fig. 5, the coil is wound clockwise from outside to inside, D7 is a terminal point connected to an external circuit, a series capacitor C4 is connected to a coil outlet terminal F, a first wire enters from the S terminal and is wound clockwise to the tail terminal D1 for division, a second wire is wound clockwise from the head terminal D2 to the tail terminal D3 for division, a third wire is wound clockwise from the head terminal D4 to the tail terminal D5 for division, a fourth wire is wound clockwise from the head terminal D6 to the innermost ring and is wound to the outlet terminal F, and the F terminal is connected to the external circuit. The capacitor C1 is connected in series between the tail end D1 of the first wire and the head end D2 of the second wire, the capacitor C2 is connected in series between the tail end D3 of the second wire and the head end D4 of the third wire, and the capacitor C3 is connected in series between the tail end D5 of the third wire and the head end D6 of the fourth wire.
In summary, the invention discloses a segmented resonance wireless charging coupling coil for an electric vehicle, the coupling coil is wound clockwise from outside to inside, the coupling coil is divided into N segments, the incoming line end is connected with a first capacitor, an ith compensation capacitor is connected between the i-1 segment of the coupling coil and the ith segment of the coupling coil, and i is more than or equal to 2 and less than or equal to N; the ith section of coupling coil resonates with the ith compensation capacitor. Each segmented coil is provided with a series compensation capacitor for resonance compensation. This electric automobile wireless charging coupling coil passes through the coupling coil segmentation back, can realize that every section coil voltage of system diminishes, diminishes at aluminum plate's displacement current, and aluminum plate's induced voltage diminishes, and the electromagnetism is harassed and is reduced to guarantee the wireless charging system safe operation of electric automobile.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A wireless charging coupling coil of electric automobile segmented resonance is characterized in that the coupling coil is wound outwards and inwards, the coupling coil is divided into N sections, an incoming line end is connected with a first capacitor, an ith compensation capacitor is connected between an i-1 section of coupling coil and an ith section of coupling coil, and i is more than or equal to 2 and less than or equal to N;
the ith section of coupling coil resonates with the ith compensation capacitor.
2. A wireless charging coupling coil of electric automobile segmental resonance is characterized in that the coupling coil is wound outwards and inwards, the coupling coil is divided into N sections, an ith compensation capacitor is connected between the ith section of coupling coil and the (i + 1) th section of coupling coil, and i is more than or equal to 1 and less than or equal to N-1; the outlet end is connected with the Nth capacitor;
the ith section of coupling coil resonates with the ith compensation capacitor.
3. The wireless charging coupling coil of electric automobile segmentation resonance according to claim 1 or 2, characterized in that, the setting of voltage peak value Vp, N at coupling coil both ends satisfies: Vp/N is less than or equal to 500V.
4. The segmented resonance wireless charging coupling coil for the electric automobile according to claim 1 or 2, wherein the coupling coil is divided into N segments for sharing.
5. The segmented resonance wireless charging coupling coil for the electric automobile according to claim 1 or 2, wherein the coupling coil is divided into N segments which are not equally divided.
6. The wireless charging coupling coil of electric automobile segmentation resonance of claim 1, characterized in that, the distance between ith-1 section coupling coil and ith section coupling coil does not exceed 20 mm.
7. The wireless charging coupling coil of electric automobile segmentation resonance of claim 2, characterized in that, the distance between ith segment coupling coil and the (i + 1) th segment coupling coil does not exceed 20 mm.
8. The segmented resonance wireless charging coupling coil for the electric automobile according to claim 1 or 2, wherein each compensation capacitor is arranged inside or outside the coupling coil.
9. The segmented resonance wireless charging coupling coil for the electric automobile according to claim 1 or 2, wherein the total inductance value of the series connection of the coupling coil after the segmentation is equal to that before the segmentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094685.7A CN113839468A (en) | 2021-09-17 | 2021-09-17 | Wireless charging coupling coil for segmented resonance of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094685.7A CN113839468A (en) | 2021-09-17 | 2021-09-17 | Wireless charging coupling coil for segmented resonance of electric automobile |
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| CN113839468A true CN113839468A (en) | 2021-12-24 |
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| CN202111094685.7A Pending CN113839468A (en) | 2021-09-17 | 2021-09-17 | Wireless charging coupling coil for segmented resonance of electric automobile |
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|---|---|---|---|---|
| CN103296989A (en) * | 2013-05-06 | 2013-09-11 | 南京航空航天大学 | Resonance circuit with resonant inductor and capacitor connected in segmented series |
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| CN107069990A (en) * | 2017-03-27 | 2017-08-18 | 华北电力大学（保定） | A kind of two-band magnet coupled resonant type wireless electric energy and signal synchronous transmission system |
| CN109664778A (en) * | 2018-12-19 | 2019-04-23 | 国网江苏省电力有限公司 | A kind of electric car dynamic radio charging system based on short sectional coil |
| CN110350636A (en) * | 2019-08-12 | 2019-10-18 | 广东工业大学 | A kind of wireless charging system and method |
| CN110696642A (en) * | 2019-09-27 | 2020-01-17 | 南京理工大学 | Wireless charging coupling mechanism based on inductance integrated LCC compensation topology |
| CN111342565A (en) * | 2020-03-19 | 2020-06-26 | 许继集团有限公司 | Electric power wireless transmission coupling device and system |
| CN112311204A (en) * | 2020-10-21 | 2021-02-02 | 哈尔滨工业大学 | Segmented series compensation method for reducing coil loss of resonant converter |
| CN112737142A (en) * | 2020-12-23 | 2021-04-30 | 中兴新能源科技有限公司 | Mutual inductance detection method and control method of wireless charging system and corresponding system |
-
2021
- 2021-09-17 CN CN202111094685.7A patent/CN113839468A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296989A (en) * | 2013-05-06 | 2013-09-11 | 南京航空航天大学 | Resonance circuit with resonant inductor and capacitor connected in segmented series |
| CN104578222A (en) * | 2013-10-28 | 2015-04-29 | 华为技术有限公司 | Wireless charging device and system |
| CN107069990A (en) * | 2017-03-27 | 2017-08-18 | 华北电力大学（保定） | A kind of two-band magnet coupled resonant type wireless electric energy and signal synchronous transmission system |
| CN109664778A (en) * | 2018-12-19 | 2019-04-23 | 国网江苏省电力有限公司 | A kind of electric car dynamic radio charging system based on short sectional coil |
| CN110350636A (en) * | 2019-08-12 | 2019-10-18 | 广东工业大学 | A kind of wireless charging system and method |
| CN110696642A (en) * | 2019-09-27 | 2020-01-17 | 南京理工大学 | Wireless charging coupling mechanism based on inductance integrated LCC compensation topology |
| CN111342565A (en) * | 2020-03-19 | 2020-06-26 | 许继集团有限公司 | Electric power wireless transmission coupling device and system |
| CN112311204A (en) * | 2020-10-21 | 2021-02-02 | 哈尔滨工业大学 | Segmented series compensation method for reducing coil loss of resonant converter |
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