CN111785475A - Winding structure, transformer and wireless charging system of car - Google Patents

Winding structure, transformer and wireless charging system of car Download PDF

Info

Publication number
CN111785475A
CN111785475A CN202010775131.2A CN202010775131A CN111785475A CN 111785475 A CN111785475 A CN 111785475A CN 202010775131 A CN202010775131 A CN 202010775131A CN 111785475 A CN111785475 A CN 111785475A
Authority
CN
China
Prior art keywords
winding
coil
coils
impedances
turn
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010775131.2A
Other languages
Chinese (zh)
Inventor
刘玮
罗勇
胡超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongxing New Energy Automobile Co ltd
Original Assignee
Zhongxing New Energy Automobile Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhongxing New Energy Automobile Co ltd filed Critical Zhongxing New Energy Automobile Co ltd
Priority to CN202010775131.2A priority Critical patent/CN111785475A/en
Publication of CN111785475A publication Critical patent/CN111785475A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/006—Details of transformers or inductances, in general with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2871—Pancake coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a winding structure which at least comprises a first winding and a second winding which are connected in parallel, wherein the first winding and the second winding are respectively formed by winding independent conducting wires and are wound in parallel, the first winding comprises a multi-turn first coil, the second winding comprises a multi-turn second coil, the multiple first coils comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the multiple second coils also comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, and the first turn coil of the second winding is wound on the periphery of the corresponding first turn coil of the first winding, wherein the impedance of the first winding is equal to that of the second winding, or the difference value of the impedance of the first winding and the impedance of the second winding is within a preset range. The invention solves the problem of uneven current of a multi-strand wound winding. In addition, a transformer and an automobile wireless charging system are also provided.

Description

Winding structure, transformer and wireless charging system of car
Technical Field
The invention relates to the technical field of transformers, in particular to a winding structure, a transformer and an automobile wireless charging system.
Background
The wireless charging mode of the electric automobile is a technology for transmitting power grid energy to a battery in a non-contact mode by utilizing the principle of electromagnetic induction coupling. The loosely coupled transformer is used as a core component of wireless charging, and a primary coil and a secondary coil of the loosely coupled transformer are respectively arranged on a capital construction subsystem and a vehicle-mounted subsystem and are respectively used for transmitting and receiving energy to realize energy transmission.
In the prior art, a primary coil and a secondary coil are windings wound by multiple strands, and the windings wound by the multiple strands have a non-uniform current phenomenon, that is, the current flowing through each cable in the coils is not equal due to the non-uniform impedance. This non-uniform current phenomenon can affect the effect of parallel winding and the performance of the system, and even can make the parallel winding method fail.
Disclosure of Invention
The invention mainly aims to provide a winding structure, a transformer and an automobile wireless charging system, and aims to solve the problem that a multi-strand winding has an uneven current phenomenon.
In order to achieve the above object, the present invention provides a winding structure, which at least includes a first winding and a second winding connected in parallel, wherein the first winding and the second winding are respectively formed by winding a single wire, and the first winding and the second winding are wound in parallel, the first winding comprises a multi-turn first coil, the second winding comprises a multi-turn second coil, the first coils comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the second coils also comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the first turn coil of the second winding is wrapped on the periphery of the corresponding first turn coil of the first winding, wherein the impedances of the first winding and the second winding are equal, or the difference between the impedances of the first winding and the second winding is within a predetermined range.
In an embodiment, the first winding and the second winding are made of wires made of the same material, and the length of the wire of the second winding relative to the first winding is adjusted to make the impedance of the first winding equal to that of the second winding, or the difference between the impedance of the first winding and that of the second winding is within a predetermined range.
In an embodiment, the first winding and the second winding are made of wires made of the same material, and the length of the wire of the first winding relative to the length of the wire of the second winding is adjusted to make the impedance of the first winding equal to that of the second winding, or the difference between the impedance of the first winding and that of the second winding is within a predetermined range.
In an embodiment, the first winding has a first inner connection end and a first outer connection end, the second winding has a second inner connection end and a second outer connection end, the first inner connection end and the second inner connection end have different winding start points, and/or the first outer connection end and the second outer connection end have different winding end points.
In an embodiment, each of the second coils is wrapped around a corresponding periphery of each of the first coils, a length of a wire corresponding to the second winding is greater than a length of a wire corresponding to the first winding, the first winding and the second winding are formed by winding wires made of different materials, and an internal resistance of a material of the wire forming the first winding is greater than an internal resistance of a material of the wire forming the second winding.
In one embodiment, the plurality of first coils of the first winding are divided into a first inner coil and a first outer coil, and the plurality of second coils of the second winding are divided into a plurality of second inner coils and a plurality of second outer coils, wherein the second inner coils are wound around the periphery of the corresponding first inner coils, and the first outer coils are wound around the periphery of the corresponding second outer coils, so that the impedances of the first winding and the second winding are equal, or the difference between the impedances of the first winding and the second winding is within a predetermined range.
In an embodiment, the first winding and/or the second winding includes a winding body and an impedance adjusting circuit electrically connected to the winding body, and the impedance adjusting circuit is configured to adjust an impedance of the first winding and/or the second winding so that the impedance of the first winding and the impedance of the second winding are equal to each other, or a difference between the impedances of the first winding and the second winding is within a predetermined range.
In order to achieve the above object, the present invention provides a transformer, which includes a primary winding and a secondary winding coupled to the primary winding, wherein the primary winding and/or the secondary winding includes the winding structure as described above.
In order to achieve the above object, the present invention provides a wireless charging system for an automobile, where the wireless charging system has the winding structure described above, and the wireless charging system further includes:
the primary winding is arranged in the power supply system;
and the secondary winding is arranged in the power receiving device and is electrically connected with a battery of the power receiving device.
In the technical scheme provided by the application, the winding structure at least comprises a first winding and a second winding which are connected in parallel, the first winding and the second winding are respectively formed by winding independent conducting wires, and the first winding and the second winding are wound in parallel, the first winding comprises a multi-turn first coil, the second winding comprises a multi-turn second coil, the first coils comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the second coils also comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the first turn coil of the second winding is wrapped on the periphery of the corresponding first turn coil of the first winding, wherein the impedances of the first winding and the second winding are equal, or the difference between the impedances of the first winding and the second winding is within a predetermined range. The impedance of the first winding and the impedance of the second winding in the winding structure are equal, so that the currents of the first winding and the second winding are equal, the difference value of the impedances of the first winding and the second winding is within a preset range, the difference value of the currents of the first winding and the second winding is within the preset range, and the problem that the winding formed by winding in multiple strands has the phenomenon of uneven current is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of a fourth embodiment of a winding structure of the present invention;
FIG. 2 is a schematic diagram of a fourth embodiment of a winding structure of the present invention;
FIG. 3 is a schematic diagram of a transformer according to the present invention;
FIG. 4 is a schematic structural diagram of a wireless charging system for a vehicle according to the present invention;
the reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
10 First winding 20 Second winding
a1 First external connection terminal a2 Second external connection terminal
b1 First internal connection terminal b2 Second internal connection terminal
Lp Primary winding Ls Secondary winding
100 Power supply device 200 Power receiving device
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 or 2, the present invention provides a winding structure, which provides a first embodiment of the present invention, the winding structure includes at least a first winding 10 and a second winding 20 connected in parallel, the first winding 10 and the second winding 20 are each formed by winding a single wire, and the first winding 10 and the second winding 20 are wound in parallel, the first winding 10 includes a multi-turn first coil, the second winding 20 includes a multi-turn second coil, the plurality of first coils include a first turn coil, a second turn coil, and a third turn coil … … nth turn coil formed by winding from inside to outside, the plurality of second coils also include a first turn coil, a second turn coil, and a third turn coil … … nth turn coil formed by winding from inside to outside, the first turn coil of the second winding 20 is wound around the periphery of the corresponding first turn coil of the first winding 10, wherein the impedance of the first winding 10 is equal to that of the second winding 20, alternatively, the difference in impedance between the first winding 10 and the second winding 20 is within a predetermined range.
In the technical solution proposed in this embodiment, the winding structure at least includes a first winding 10 and a second winding 20 connected in parallel, and a certain gap may or may not be provided between the first winding 10 and the second winding 20. The first winding 10 includes a plurality of turns of a first coil, wherein the first coil is a complete first coil starting from a starting position of the first winding 10 and making one turn to the starting position, the plurality of first coils are wound from inside to outside to form a first turn coil, a second turn coil, a third turn coil and … … nth turn coil, and the first coil at the outermost turn may be a complete coil or a partial coil. The second coil is a complete second coil starting from the starting position of the second winding 20 and making one turn to the starting position, the plurality of second coils also include a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are wound from inside to outside, and the second coil at the outermost turn can be a complete coil or a partial coil. The first turns of the second winding 20 are wound around the corresponding first turns of the first winding 10, the remaining second windings may be wound around the corresponding first windings, and the remaining first windings may be wound around the corresponding second windings.
The winding impedance is mainly determined by the winding internal resistance and the winding self-inductance, wherein the main influence factor of the winding internal resistance is the winding length, and the main influence factor of the winding self-inductance is the winding area and the magnetic flux intensity. By adjusting the winding length, the internal resistance of the winding is adjusted, and meanwhile, the winding area is also adjusted.
The impedance of the second winding 20 can be reduced by reducing the winding length of any turn in the second winding 20, so that the impedance of the second winding 20 is equal to the impedance of the first winding 10, or the impedance of the second winding 20 and the first winding 10 is in a predetermined range.
The impedance of the first winding 10 may be increased by increasing the winding length of any turn of the first winding 10, so that the impedance of the first winding 10 is equal to the impedance of the second winding 20, or the impedances of the first winding 10 and the second winding 20 are within a predetermined range.
The impedance of the second winding 20 may also be reduced by decreasing the winding length of any turn of the second winding 20, and/or the impedance of the first winding 10 may be increased by increasing the winding length of any turn of the first winding 10, so that the impedance of the first winding 10 is equal to the impedance of the second winding 20, or the impedance of the first winding 10 and the second winding 20 is within a predetermined range.
In the winding structure of the embodiment, the impedances of the first winding 10 and the second winding 20 are equal, so that the currents of the first winding 10 and the second winding 20 are equal, the difference value of the impedances of the first winding 10 and the second winding 20 is within a predetermined range, the difference value of the currents of the first winding 10 and the second winding 20 is within the predetermined range, and the problem that the winding formed by winding a plurality of strands has the phenomenon of uneven current is solved.
Referring to fig. 1 or 2, a second embodiment of the present invention is proposed based on the first embodiment, in which the first winding 10 and the second winding 20 are made of wires made of the same material, and the length of the wire of the second winding 20 relative to the first winding 10 is adjusted to make the impedances of the first winding 10 and the second winding 20 equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range.
In the technical solution proposed in this embodiment, the first winding 10 and the second winding 20 use conducting wires made of the same material, so that the internal resistances of the first winding 10 and the second winding 20 with the same length are the same, and the length of the conducting wire of the second winding 20 relative to the first winding 10 is adjusted to make the impedances of the first winding 10 and the second winding 20 equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range. Therefore, the same voltage is applied to the two ends of the first winding 10 and the second winding 20, the impedances of the first winding 10 and the second winding 20 are equal, the currents of the first winding 10 and the second winding 20 can be equal, the difference value of the impedances of the first winding 10 and the second winding 20 is in a preset range, the difference value of the currents of the first winding 10 and the second winding 20 is in the preset range, and the problem that the winding formed by winding a plurality of strands has the phenomenon of uneven current is solved.
Referring to fig. 1 or 2, a third embodiment of the present invention is proposed based on the first or second embodiment, in which the first winding 10 and the second winding 20 are made of wires made of the same material, and the length of the wire of the first winding 10 relative to the length of the wire of the second winding 20 is adjusted so that the impedances of the first winding 10 and the second winding 20 are equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range.
In the technical solution proposed in this embodiment, the first winding 10 and the second winding 20 use conducting wires made of the same material, so that the internal resistances of the first winding 10 and the second winding 20 with the same length are the same, and the length of the conducting wire of the first winding 10 relative to the second winding 20 is adjusted to make the impedances of the first winding and the second winding 20 equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range. Therefore, the same voltage is applied to the two ends of the first winding 10 and the second winding 20, the impedances of the first winding 10 and the second winding 20 are equal, the currents of the first winding 10 and the second winding 20 can be equal, the difference value of the impedances of the first winding 10 and the second winding 20 is in a preset range, the difference value of the currents of the first winding 10 and the second winding 20 is in the preset range, and the problem that the winding formed by winding a plurality of strands has the phenomenon of uneven current is solved.
Referring to fig. 1 or 2, based on any one of the first to third embodiments, a fourth embodiment of the present invention is provided, in which the first winding 10 has a first inner connection end b1 and a first outer connection end a1, the second winding 20 has a second inner connection end b2 and a second outer connection end a2, the first inner connection end b1 and the second inner connection end b2 have different winding starting points, and/or the first outer connection end a1 and the second outer connection end a2 have different winding ending points.
In the solution proposed in this embodiment, the first inner connection end b1 of the first winding 10 is the starting position of the innermost first coil, and the first outer connection end a1 is the ending position of the outermost first coil. The second inner connection end b2 of the second winding 20 is the start position of the innermost second coil, and the second outer connection end a2 is the end position of the outermost second coil.
As shown in fig. 1, the winding end points of the first and second external connection terminals a1 and a2 are fixed, the length of the first winding 10 is adjusted by adjusting the winding start point of the first internal connection terminal b1, and/or the length of the second winding 20 is adjusted by adjusting the winding start point of the second internal connection terminal b2, thereby adjusting the impedance of the first winding 10 and/or the second winding 20. The impedances of the first winding 10 and the second winding 20 can be made the same, and the currents flowing through the first winding 10 and the second winding 20 can be made equal in the case where the voltages across the first winding 10 and the second winding 20 are the same. It is also possible to make the difference between the impedances of the first winding 10 and the second winding 20 within a predetermined range, and to make the difference between the currents flowing through the first winding 10 and the second winding 20 within a predetermined range in the case where the voltages across the first winding 10 and the second winding 20 are the same.
As shown in fig. 2, the winding start point of the first inner connection terminal b1 and the second inner connection terminal b2 is fixed, the length of the first winding 10 is adjusted by adjusting the winding end point of the first outer connection terminal a1, and/or the length of the second winding 20 is adjusted by adjusting the winding end point of the second outer connection terminal a2, thereby adjusting the impedance of the first winding 10 and/or the second winding 20. The impedances of the first winding 10 and the second winding 20 can be made the same, and the currents flowing through the first winding 10 and the second winding 20 can be made equal in the case where the voltages across the first winding 10 and the second winding 20 are the same. It is also possible to make the difference between the impedances of the first winding 10 and the second winding 20 within a predetermined range, and to make the difference between the currents flowing through the first winding 10 and the second winding 20 within a predetermined range in the case where the voltages across the first winding 10 and the second winding 20 are the same.
The first inner connection terminal b1, the second inner connection terminal b2, the first outer connection terminal a1 and the second outer connection terminal a2 may also be adjusted simultaneously to adjust the lengths of the first winding 10 and the second winding 20, thereby adjusting the impedance of the first winding 10 and the second winding 20. The impedances of the first winding 10 and the second winding 20 can be made the same, and the currents flowing through the first winding 10 and the second winding 20 can be made equal in the case where the voltages across the first winding 10 and the second winding 20 are the same. It is also possible to make the difference between the impedances of the first winding 10 and the second winding 20 within a predetermined range, and to make the difference between the currents flowing through the first winding 10 and the second winding 20 within a predetermined range in the case where the voltages across the first winding 10 and the second winding 20 are the same.
Referring to fig. 1 or fig. 2, a fifth embodiment of the present invention is provided based on any one of the first to fourth embodiments, each of the second coils is wrapped around the periphery of each of the corresponding first coils, the length of the wire corresponding to the second winding 20 is greater than the length of the wire corresponding to the first winding 10, the first winding 10 and the second winding 20 are formed by winding wires of different materials in parallel, and the material of the wire forming the first winding 10 has an internal resistance greater than the material of the wire forming the second winding 20.
In the technical solution proposed in this embodiment, each second coil of the second winding 20 is wrapped around the periphery of each first coil of the corresponding first winding 10, the length of the wire corresponding to the second winding 20 is greater than the length of the wire corresponding to the first winding 10, and here, the impedance of the first winding 10 is smaller than that of the second winding 20. The second winding 20 is replaced by a material with smaller internal resistance, and/or the first winding 10 is replaced by a material with larger internal resistance, so that the impedances of the first winding 10 and the second winding 20 are the same, and under the condition that the voltages at two ends of the first winding 10 and the second winding 20 are the same, the currents flowing through the first winding 10 and the second winding 20 can be equal. It is also possible to make the difference between the impedances of the first winding 10 and the second winding 20 within a predetermined range, and to make the difference between the currents flowing through the first winding 10 and the second winding 20 within a predetermined range in the case where the voltages across the first winding 10 and the second winding 20 are the same.
Referring to fig. 1 or 2, a seventh embodiment of the present invention is proposed based on any one of the first to sixth embodiments, and the plurality of second coils of the second winding 20 are divided into a plurality of second inner coils and a plurality of second outer coils, wherein the second inner coils are wound around the peripheries of the corresponding first inner coils, and the first outer coils are wound around the peripheries of the corresponding second outer coils, so that the impedances of the first winding 10 and the second winding 20 are equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range.
In the solution proposed in this embodiment, the second inner coil of the second winding 20 is wound around the periphery of the first inner coil of the first winding 10. The first outer coil of the first winding 10 is wound around the second outer coil of the second winding 20. By changing the internal and external relations of the plurality of first coils of the first winding 10 and the plurality of second coils of the second winding 20, the lengths of the first winding 10 and the second winding 20 are the same or the length difference value meets a predetermined range. The impedances of the first winding 10 and the second winding 20 can be made the same, and the currents flowing through the first winding 10 and the second winding 20 can be made equal in the case where the voltages across the first winding 10 and the second winding 20 are the same. It is also possible to make the difference between the impedances of the first winding 10 and the second winding 20 within a predetermined range, and to make the difference between the currents flowing through the first winding 10 and the second winding 20 within a predetermined range in the case where the voltages across the first winding 10 and the second winding 20 are the same.
Referring to fig. 1 or fig. 2, an eighth embodiment of the present invention is provided based on any one of the first to seventh embodiments, where the first winding 10 and/or the second winding 20 includes a winding body and an impedance adjusting circuit electrically connected to the winding body, and the impedance adjusting circuit is configured to adjust an impedance of the first winding 10 and/or the second winding 20 so as to make the impedance of the first winding 10 equal to that of the second winding 20, or so that a difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range.
In the solution proposed in this embodiment, the impedance of the first winding 10 and/or the second winding 20 is changed by the impedance adjusting circuit, for example, the impedance of the second winding 20 may be reduced by the impedance adjusting circuit, and/or the impedance of the first winding 10 may be increased by the impedance adjusting circuit. So that the impedances of the first winding 10 and the second winding 20 are equal, or the difference between the impedances of the first winding 10 and the second winding 20 is within a predetermined range. Therefore, the same voltage is applied to the two ends of the first winding 10 and the second winding 20, the impedances of the first winding 10 and the second winding 20 are equal, the currents of the first winding 10 and the second winding 20 can be equal, the difference value of the impedances of the first winding 10 and the second winding 20 is in a preset range, the difference value of the currents of the first winding 10 and the second winding 20 is in the preset range, and the problem that the winding formed by winding a plurality of strands has the phenomenon of uneven current is solved.
Referring to fig. 3, based on the winding structure, the present invention further provides a transformer, where the transformer includes a primary winding Lp and a secondary winding Ls coupled to the primary winding Lp, and the primary winding Lp and/or the secondary winding Ls include the winding structure as described above.
Referring to fig. 4, based on the winding structure, the present invention further provides an automobile wireless charging system, where the winding structure of the wireless charging system is as described above, and the wireless charging system further includes: the power supply device 100, the primary winding is arranged in the power supply system; a power receiving device 200, wherein the secondary winding is disposed in the power receiving device 200 and electrically connected to a battery of the power receiving device 200.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. A winding structure, characterized in that the winding structure comprises at least a first winding and a second winding connected in parallel, the first winding and the second winding are each formed by winding a separate wire, and the first winding and the second winding are wound in parallel, the first winding comprises a multi-turn first coil, the second winding comprises a multi-turn second coil, the first coils comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the second coils also comprise a first turn coil, a second turn coil and a third turn coil … … Nth turn coil which are formed by winding from inside to outside, the first turn coil of the second winding is wrapped on the periphery of the corresponding first turn coil of the first winding, wherein the impedances of the first winding and the second winding are equal, or the difference between the impedances of the first winding and the second winding is within a predetermined range.
2. The winding structure according to claim 1, wherein the first winding and the second winding are made of wires of the same material, and wherein the impedances of the first winding and the second winding are made equal or the difference between the impedances of the first winding and the second winding is within a predetermined range by adjusting the length of the wire of the second winding with respect to the first winding.
3. The winding structure according to claim 1, wherein the first winding and the second winding are made of wires of the same material, and wherein the impedances of the first winding and the second winding are made equal or the difference between the impedances of the first winding and the second winding is within a predetermined range by adjusting the length of the wire of the first winding relative to the second winding.
4. A winding construction according to claim 2 or 3, wherein the first winding has a first inner connection end and a first outer connection end, the second winding has a second inner connection end and a second outer connection end, the first inner connection end and the second inner connection end have different winding start points, and/or the first outer connection end and the second outer connection end have different winding end points.
5. The winding structure according to claim 1, wherein each of the second coils is wound around a periphery of each of the corresponding first coils, a length of a wire corresponding to the second coil is longer than a length of a wire corresponding to the first coil, the first and second coils are formed by winding wires of different materials, and an internal resistance of a material of the wire forming the first coil is larger than an internal resistance of a material of the wire forming the second coil.
6. The winding structure according to claim 1, wherein a plurality of first coils of the first winding are divided into a first inner coil and a first outer coil, and a plurality of second coils of the second winding are divided into a plurality of second inner coils and a plurality of second outer coils, wherein the second inner coils are wound around a periphery of the corresponding first inner coils, and the first outer coils are wound around a periphery of the corresponding second outer coils, so that impedances of the first winding and the second winding are equal, or a difference in the impedances of the first winding and the second winding is within a predetermined range.
7. The winding structure according to claim 1, wherein the first winding and/or the second winding includes a winding body and an impedance adjusting circuit electrically connected to the winding body, and the impedance adjusting circuit is configured to adjust an impedance of the first winding and/or the second winding so that the impedance of the first winding and the impedance of the second winding are equal to each other, or a difference between the impedances of the first winding and the second winding is within a predetermined range.
8. A transformer, characterized in that the transformer comprises a primary winding and a secondary winding coupled to the primary winding, and the primary winding and/or the secondary winding comprises a winding structure according to any one of claims 1 to 7.
9. A wireless charging system for a vehicle, wherein the wireless charging system comprises the winding structure of any one of claims 1-7, and further comprising:
the primary winding is arranged in the power supply system;
and the secondary winding is arranged in the power receiving device and is electrically connected with a battery of the power receiving device.
CN202010775131.2A 2020-08-03 2020-08-03 Winding structure, transformer and wireless charging system of car Pending CN111785475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010775131.2A CN111785475A (en) 2020-08-03 2020-08-03 Winding structure, transformer and wireless charging system of car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010775131.2A CN111785475A (en) 2020-08-03 2020-08-03 Winding structure, transformer and wireless charging system of car

Publications (1)

Publication Number Publication Date
CN111785475A true CN111785475A (en) 2020-10-16

Family

ID=72766024

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010775131.2A Pending CN111785475A (en) 2020-08-03 2020-08-03 Winding structure, transformer and wireless charging system of car

Country Status (1)

Country Link
CN (1) CN111785475A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112735727A (en) * 2020-12-16 2021-04-30 华东师范大学 Design method of PCB coil device of wireless power transmission system
EP4054057A1 (en) * 2021-03-04 2022-09-07 ElectDis AB A coil unit, and associated methods

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112735727A (en) * 2020-12-16 2021-04-30 华东师范大学 Design method of PCB coil device of wireless power transmission system
EP4054057A1 (en) * 2021-03-04 2022-09-07 ElectDis AB A coil unit, and associated methods
WO2022184890A1 (en) * 2021-03-04 2022-09-09 Electdis Ab A coil unit, and associated methods

Similar Documents

Publication Publication Date Title
EP2854145B1 (en) Contactless electrical-power-supplying transformer for moving body
CN1998055B (en) Planar high voltage transformer device
US10096421B2 (en) Coil device and method for manufacturing the same
US11908616B2 (en) Coil unit for inductively charging a vehicle
CN111785475A (en) Winding structure, transformer and wireless charging system of car
CN103003894B (en) Polyphase transformer and transformation system
CN103050223A (en) Inductor and manufacturing method of the same
Shimizu et al. A new he core transmitter of a contactless power transfer system that is compatible with circular core receivers and H-shaped core receivers
US10692646B2 (en) Single litz wire transformers
EP3588762B1 (en) Multi-winding inductive device for bi-directional dc-dc converter, converter, and power supply
JP6971062B2 (en) Manufacturing method of coil for non-contact power supply device and coil for non-contact power supply device
CN213070784U (en) Winding structure, transformer and wireless charging system of car
CN216389010U (en) High-frequency vertical winding inductor
Hanawa et al. Proposal of Ferrite-less and Capacitor-less 85 kHz Four-Layer Coil for Stationary Wireless Power Transfer
CN207116212U (en) A kind of current transformer of polytropic ratio
Ziegler et al. Influences of WPT-coil losses and coupling coefficient on the resonance circuits of wireless power transfer systems
CN109791833A (en) The design method of coil, reactor and coil
CN112955986B (en) Electrical component
CN202513025U (en) Extra-high-voltage current transformer with annular shielding box
de Miranda et al. Alternative configuration of open-bifilar coil for self-resonant wireless power transfer system
CN217719255U (en) Coil winding structure and transformer
CN221529655U (en) Inductance device
CN112953248B (en) Step-up transformer, step-up method and step-up circuit
CN219575932U (en) Coil structure and NFC card
CN217061731U (en) Secondary winding structure of voltage transformer

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination