CN111211407B - Antenna assembly and wireless charging device comprising such an antenna assembly - Google Patents

Antenna assembly and wireless charging device comprising such an antenna assembly Download PDF

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Publication number
CN111211407B
CN111211407B CN201811389111.0A CN201811389111A CN111211407B CN 111211407 B CN111211407 B CN 111211407B CN 201811389111 A CN201811389111 A CN 201811389111A CN 111211407 B CN111211407 B CN 111211407B
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CN
China
Prior art keywords
antenna
coil antenna
coil
terminals
pair
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Application number
CN201811389111.0A
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Chinese (zh)
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CN111211407A (en
Inventor
修罗
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.)
Valeo Comfort and Driving Assistance SAS
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Valeo Comfort and Driving Assistance SAS
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Priority to CN201811389111.0A priority Critical patent/CN111211407B/en
Priority to PCT/EP2019/078846 priority patent/WO2020104134A1/en
Publication of CN111211407A publication Critical patent/CN111211407A/en
Application granted granted Critical
Publication of CN111211407B publication Critical patent/CN111211407B/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • 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
    • 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
    • H01F27/2804—Printed windings
    • 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
    • H01F27/2866—Combination of wires and sheets
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • 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
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • 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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

An antenna assembly (2) comprising: -at least a first pair of terminals (12, 14) and a second pair of terminals (16, 18); -a stamped coil antenna (6) connected to the first pair of terminals (12, 14); -a second coil antenna (8) connected to a second pair of terminals (16, 18). The first coil antenna (6) is of the stamped type. The first coil antenna (6) and the second coil antenna (8) are arranged in a first antenna layer comprising at least the first coil antenna and in a second antenna layer comprising at least the second coil antenna and being different from the first antenna layer, respectively. The first coil antenna (6) and the second coil antenna (8) at least partially overlap. The second coil antenna (8) has a quality factor in the empty air that is greater than that of the first coil antenna (6). A wireless charging apparatus is also described, comprising such an antenna assembly.

Description

Antenna assembly and wireless charging device comprising such an antenna assembly
Technical Field
The invention relates to wireless charging.
More particularly, the present invention relates to antenna assemblies and wireless charging devices including such antenna assemblies.
Background
The wireless charging device is provided with an antenna assembly for generating an alternating magnetic field.
In some embodiments, such an antenna assembly includes at least a first pair of terminals, a second pair of terminals, a first coil antenna connected to the first pair of terminals, and a second coil antenna connected to the second pair of terminals.
In such an antenna assembly, the first coil antenna and the second coil antenna may be arranged in a first antenna layer (including at least the first coil antenna) and a second antenna layer (including at least the second coil antenna), respectively.
When seeking to reduce cost, the first coil antenna and the second coil antenna are stamped coil antennas; the quality factor of stamped coil antennas is low compared to other technologies such as using Litz (Litz) wire, thereby negatively impacting the efficiency of the system.
Disclosure of Invention
In this context, the present invention provides an antenna assembly comprising:
-at least a first pair of terminals and a second pair of terminals;
-a first coil antenna connected to a first pair of terminals, said first coil antenna being of the stamped type;
A second coil antenna connected to a second pair of terminals,
Wherein the first coil antenna and the second coil antenna are arranged in a first antenna layer comprising at least the first coil antenna and in a second antenna layer comprising at least the second coil antenna and being different from the first antenna layer, respectively, wherein the first coil antenna and the second coil antenna at least partially overlap, and wherein the second coil antenna has a quality factor in empty air that is greater than the first coil antenna.
The use of different types of coil antennas for the first and second antennas, respectively, is predictably inefficient. For example, the first (stamped) coil antenna is expected to be of little significance compared to a second coil antenna having a higher quality factor; the first (stamped) coil antenna is considered problematic because it is detrimental to the quality factor of the second coil antenna.
Conversely, when considering the Quality Factor (QF) of the two coil antennas, the structure proposed above is relatively balanced and a satisfactory good result is achieved at a reduced cost.
According to possible optional functions:
-a first antenna layer comprises at least a third coil antenna (and possibly additional coil antennas) adjacent to the first coil antenna in the first antenna layer;
the third coil antenna (and possibly each additional coil antenna) is stamped;
the second coil antenna has a quality factor in empty air higher than 60 (possibly higher than 100, for example in the case of the litz coil antenna mentioned below);
-the second coil antenna comprises at least one wound insulated wire;
the second coil antenna is a litz wire coil antenna;
-the second coil antenna is formed by a conductive track of a flexible printed circuit;
-the second antenna layer comprises an additional coil antenna adjoining the first coil antenna in the second antenna layer;
-the first coil antenna is located on a first face on the printed circuit board;
-the second coil antenna is arranged at least partially overlapping the first coil antenna;
in general, the coil antenna layers are located in an unspecified order on the first side of the printed circuit board;
a second side of the printed circuit board opposite to the first side carries the reradiating antenna.
The invention also provides an antenna assembly comprising:
-at least a first pair of terminals and a second pair of terminals;
-a stamped coil antenna connected to the first pair of terminals;
-a litz wire coil antenna connected to the second pair of terminals;
Wherein the stamped coil antenna and the litz wire coil antenna are arranged in a first antenna layer comprising at least the stamped coil antenna and in a second antenna layer comprising at least the litz wire coil antenna and being different from the first antenna layer, respectively, wherein the stamped coil antenna and the litz wire coil antenna at least partly overlap.
As described above, the first antenna layer may include an additional stamped coil antenna (connected to the third pair of terminals of the antenna assembly). The further stamped coil antenna and litz wire coil antenna may also partially overlap.
The invention also provides a wireless charging device, which comprises the antenna assembly.
Such a wireless charging device may further comprise a driver circuit for delivering an alternating current and/or a selection circuit for selecting at least one pair of terminals among at least a first pair of terminals and a second pair of terminals and/or a switching circuit for applying said alternating current across the selected pair of terminals.
Other features and advantages of embodiments of the present invention will be better understood by reading the preferred embodiments thereof with reference to the drawings.
Drawings
Fig. 1 shows a first embodiment of an antenna assembly according to the invention;
fig. 2 shows a second embodiment of an antenna assembly according to the invention;
Fig. 3 shows elements of a possible electronic circuit for a wireless charging device according to the invention.
Detailed Description
Figures 1 and 2 show an antenna assembly 2 according to the invention; 102, and two possible embodiments thereof.
An antenna assembly 2;102 includes a printed circuit board 4;104 and a plurality of coil antennas 6,8,10;106,108,110.
Here, coil antennas 6,8,10;106,108,110 are located on a first side of the printed circuit board 4. The second side of the printed circuit board 4 (located opposite the first side) may carry other electrical and/or electronic circuitry, such as a reradiating antenna (not shown) in the first embodiment shown in fig. 1, or a connector 124 such as in the second embodiment shown in fig. 2.
Coil antennas 6,8,10;106,108,110 are arranged in a plurality of layers, here first layer coil antennas 6,10;106,110 are located on the printed circuit board 4;104 and a second layer coil antenna (here comprising a single coil antenna 8; 108) is located on the first layer coil antenna 6,10;106,110 (such that the first layer is interposed between the second layer and the printed circuit board 4;104, although the invention is not limited to this configuration, as follows).
In a first embodiment (as shown in fig. 1), the coil antennas 6,10 of the first layer are in contact with the printed circuit board 4.
In a second embodiment (shown in fig. 2), a ferrite plate 105 is interposed between the coil antennas 106,110 of the first layer and the printed circuit board 104.
According to a possible variant, the antenna assembly may comprise at least one further antenna layer comprising one or more coil antennas placed on a second layer of coil antennas (the second layer then comprising a plurality of coil antennas).
A first layer coil antenna 6,10;106,110 is a stamped coil antenna. In the described embodiment, two first layers of coil antennas 6,10;106,110 are both stamped coil antennas. The stamped coil antenna is a coil antenna stamped from a metal plate into a coil shape, and thus is composed of a common metal.
Such stamped coil antennas for wireless charging devices have an empty air quality factor typically below 60.
A coil antenna 8 of a second layer; 108 are litz wire coil antennas. Such litz wire coil antennas are coil antennas formed of wound litz wire, i.e. an insulated wire comprising a plurality of strands insulated from each other.
Litz wire coil antennas for wireless charging devices typically have an empty air quality factor higher than 100 (and thus higher than that of stamped coil antennas).
According to a possible variant, the coil antenna 8 may be formed by a conductive track of a flexible printed circuit. Such antennas typically have an airborne quality factor of about 70 (and thus higher than that of stamped coil antennas).
As described above, the coil antenna 8;108 are here placed at the coil antennas 6,10 of the first layer; 106,110, i.e. in the punched coil antennas 6,10;106, 110.
Precisely, coil antennas 6,10;106,110 are arranged next to each other in the first layer and coil antennas 8;108 are placed on the coil antennas 6,10;106,110 such that it coincides with the coil antenna 6,10;106,110 are each partially overlapping.
According to a possible variant, the order of the layers (starting from the printed circuit board 4; 104) may be changed without departing from the invention.
An antenna assembly 2;102 include pairs of terminals 12,14;16,18;20,22;112,114;116,118;120,122 associated with the plurality of coil antennas 6,8,10, respectively; 106,108, 110.
In the first embodiment shown in fig. 1, the terminals 12,14,16,18,20,22 are conductive pads of the printed circuit board 4 to which the ends of the associated coil antenna 6,8,10 are soldered.
Specifically, the coil antenna 6 is connected to a first pair of terminals 12,14, the coil antenna 8 is connected to a second pair of terminals 16,18, and the coil antenna 10 is connected to a third pair of terminals 20,22.
In the first embodiment shown in fig. 1, the antenna assembly 2 further comprises a connector 24, so that each pair of terminals 12,14 can be connected; 16,18;20,22 are connected to other electronic components of the wireless charging device equipped with the antenna assembly 2, as will be further explained below.
With this structure, the antenna assembly 2 is assembled, for example, to a different (main) printed circuit board (not shown) such that the coil antenna 8 faces a ferrite board that may be carried by the main printed circuit board, and such that the connector 24 connects the antenna assembly 2 to the electronic circuit of the main printed circuit board.
In the second embodiment shown in fig. 2, coil antenna 106 is connected to a first pair of terminals 112,114, coil antenna 108 is connected to a second pair of terminals 116,118, and coil antenna 110 is connected to a third pair of terminals 120,122.
In this case, the coil antennas 106,108,110 may be connected to the electronic circuits on the second side of the printed circuit board 104 through holes in the ferrite plate 105, as shown in fig. 2.
Fig. 3 shows elements of a possible electronic circuit for use in a wireless charging device 30 according to the invention.
The electronic circuit is described in the context of the first embodiment shown in fig. 1, but is also applicable to the second embodiment shown in fig. 2.
The electronic circuit is intended to control the current injection in the coil antenna of the antenna assembly. Several methods are known in the art to perform such control of the current injected in the coil antenna, so the electronic circuit now described should be understood as an exemplary and non-limiting solution to perform such control.
In this example, the wireless charging device 30 includes the antenna assembly 2 described above (or as a possible variation, the antenna assembly 102 described above), the processor 32, the driver circuit 34, and the switching circuit 36.
The driver circuit 34 comprises two terminals P, N for delivering alternating current which excites one of the coil antennas 6,8,10 (via the switching circuit 36), as described below.
The switching circuit 36 comprises a first controllable switch 38 and a second controllable switch 40, which are simultaneously controlled by a command signal C generated by the processor 32.
The first controllable switch 38 connects the first terminal P (of the two terminals P, N of the driver circuit 34) to either of the first terminals 12,16,20 of the terminal pair of the antenna assembly 2 in accordance with a command signal C received from the processor 32.
Meanwhile, the second controllable switch 40 connects the second terminal N (of the two terminals P, N of the driver circuit 34) to any one of the second terminals 14,18,22 of the terminal pair of the antenna assembly 2 according to the command signal C received from the processor 32.
As shown in fig. 3, this arrangement makes it possible to connect one of the coil antennas 6,8,10 with the driver circuit 34 such that the driver circuit 34 excites the coil antenna with alternating current (the connected coil antenna being determined based on the command signal C received from the processor 32).
The exciting alternating current injected into the connected coil antenna generates an alternating magnetic field for wirelessly charging the electronic device placed on the wireless charging device 30.
The processor 32 is programmed to select one of the coil antennas 6,8,10 and to generate a command signal C adapted to control the switching circuit 36 such that it connects the driver circuit 34 (precisely, its terminals P, N) to the selected coil antenna (precisely, the corresponding terminal pair associated with the selected coil antenna).
In this regard, the processor 32 is programmed, for example, to select a coil antenna that provides the best coupling for charging the electronic device placed on the wireless charging device 30. The coil antenna providing the best coupling is determined, for example (by the processor 32), based on measurements made in the driver circuit 34 and transmitted to the processor 32.

Claims (8)

1. An antenna assembly, comprising:
-at least a first pair of terminals (12, 14;112, 114) and a second pair of terminals (16, 18;116, 118);
-a first coil antenna (6; 106) connected to the first pair of terminals, said first coil antenna being of the stamped type;
a second coil antenna (8; 108) connected to the second pair of terminals,
Wherein the first coil antenna and the second coil antenna are arranged in a first antenna layer comprising at least the first coil antenna and in a second antenna layer comprising at least the second coil antenna and being different from the first antenna layer, respectively,
Wherein the first coil antenna and the second coil antenna at least partially overlap, an
Wherein the second coil antenna has a quality factor in empty air that is greater than that of the first coil antenna.
2. An antenna assembly according to claim 1, wherein the first antenna layer comprises at least a third coil antenna (10; 110) adjacent to the first coil antenna in the first antenna layer.
3. The antenna assembly of claim 2, wherein the third coil antenna is stamped.
4. The antenna assembly of any of claims 1-3, wherein the second coil antenna comprises at least one wound insulated wire.
5. The antenna assembly of any of claims 1-3, wherein the second coil antenna is a litz wire coil antenna.
6. The antenna assembly of any of claims 1-3, wherein the second coil antenna is formed from conductive tracks on a flexible printed circuit.
7. A wireless charging device comprising an antenna assembly according to any one of claims 1-6.
8. The wireless charging device of any one of claims 7, further comprising:
A driver circuit for delivering alternating current;
a selection circuit for selecting at least one pair of terminals from at least a first pair of terminals and a second pair of terminals;
and a switching circuit for applying the alternating current across the selected terminal pair.
CN201811389111.0A 2018-11-21 2018-11-21 Antenna assembly and wireless charging device comprising such an antenna assembly Active CN111211407B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201811389111.0A CN111211407B (en) 2018-11-21 2018-11-21 Antenna assembly and wireless charging device comprising such an antenna assembly
PCT/EP2019/078846 WO2020104134A1 (en) 2018-11-21 2019-10-23 Antenna assembly and wireless charging device comprising such an antenna assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811389111.0A CN111211407B (en) 2018-11-21 2018-11-21 Antenna assembly and wireless charging device comprising such an antenna assembly

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CN111211407A CN111211407A (en) 2020-05-29
CN111211407B true CN111211407B (en) 2024-05-28

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CN111211407A (en) 2020-05-29

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