CN212875485U - Miniaturized wireless charging circuit, printed circuit board, terminal and charging system - Google Patents
Miniaturized wireless charging circuit, printed circuit board, terminal and charging system Download PDFInfo
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- CN212875485U CN212875485U CN202021669437.1U CN202021669437U CN212875485U CN 212875485 U CN212875485 U CN 212875485U CN 202021669437 U CN202021669437 U CN 202021669437U CN 212875485 U CN212875485 U CN 212875485U
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- 238000010586 diagram Methods 0.000 description 6
- 230000005674 electromagnetic induction Effects 0.000 description 4
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- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a miniaturized wireless charging circuit, printed circuit board, terminal and charging system, this miniaturized wireless charging circuit includes resonant circuit and first electric capacity, resonant circuit receives the alternating current and converts the alternating current to the direct current and exports; the resonance circuit comprises a secondary coil which is coupled with a primary coil of a power supply end; the first capacitor is arranged in parallel with the secondary coil. This miniaturized wireless charging circuit is through the parallelly connected electric capacity in secondary coil both ends that include in the resonant circuit that sets up in small-size terminal to coupling voltage when reducing to charge between secondary coil and the primary coil looks coupling, and then reduced secondary coil's input current, even when the antenna area is less, also can have the charge efficiency of preferred, and can effectively avoid the temperature rise.
Description
Technical Field
The utility model relates to a wireless charging technology field, in particular to miniaturized wireless charging circuit, printed circuit board, terminal and charging system.
Background
WPC, Wireless Power Consortium, is intended to create and promote the market for widespread adoption of the international Wireless charging standard Qi compatible with all rechargeable electronic devices. WPC is the first industry standard organization for wireless power supplies, and establishes a standardized industry standard for low power applications of less than 5W, which aims to achieve interoperability between various charging pads and portable devices. The product that obtains authentication of the WPC alliance, the LOGO that will be identified in the word "Qi", the terminal with "Qi", can be charged on all the charging plates marked with this LOGO.
Traditional WPC antenna all is the standard size preparation according to QI standard requirement, for example cell-phone, smart machine, on-vehicle equipment etc. electronic product, WPC antenna area is great usually. With the increasing WPC function on more and more intelligent products, influenced by space limitation, the WPC antenna can not be made into the size required by QI specification and can only be customized. The WPC antenna is likely to cause problems such as low efficiency, high temperature, etc. due to its reduced area.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the prior art, the utility model provides a miniaturized wireless charging circuit, printed circuit board, terminal and charging system, it can effectively improve charge efficiency and avoid the temperature rise.
In order to solve the technical problem, the utility model provides a following technical scheme:
in a first aspect, a miniaturized wireless charging circuit is provided, which includes a resonant circuit and a first capacitor, wherein the resonant circuit receives an alternating current and converts the alternating current into a direct current to output;
the resonance circuit comprises a secondary coil which is coupled with a primary coil of a power supply end;
the first capacitor is arranged in parallel with the secondary coil.
In some preferred embodiments, the resonant circuit further includes a second capacitor connected in series with the secondary coil, and a third capacitor connected in parallel with a circuit formed by the secondary coil and the second capacitor connected in series.
In some preferred embodiments, the secondary coil comprises a plurality of annular coils wound in sequence, all the annular coils are located on the same plane, and the diameter of the largest annular coil is 13 ± 0.01 mm.
In a second aspect, a printed circuit board is also provided, which comprises the miniaturized wireless charging circuit.
In a third aspect, a terminal is provided, which includes the miniaturized wireless charging circuit.
In a fourth aspect, a charging system is further provided, which includes a power supply terminal and the terminal.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the utility model provides a miniaturized wireless charging circuit, printed circuit board, terminal and charging system, this miniaturized wireless charging circuit includes resonant circuit and first electric capacity, resonant circuit receives the alternating current and converts the alternating current to the direct current and exports; the resonance circuit comprises a secondary coil which is coupled with a primary coil of a power supply end; the first capacitor is arranged in parallel with the secondary coil. This miniaturized wireless charging circuit is through the parallelly connected electric capacity in secondary coil both ends that include in the resonant circuit that sets up in small-size terminal to coupling voltage when reducing to charge between secondary coil and the primary coil looks coupling, and then reduced secondary coil's input current, even when the antenna area is less, also can have the charge efficiency of preferred, and can effectively avoid the temperature rise.
Drawings
Fig. 1 is a schematic structural diagram of a miniaturized wireless charging circuit in an embodiment;
FIG. 2 is a schematic structural diagram of a printed circuit board according to an embodiment;
fig. 3 is a schematic structural diagram of a charging system in an embodiment;
fig. 4 is a schematic structural diagram of another perspective of the charging system in the embodiment;
FIG. 5 is a schematic structural diagram of an exemplary transmitter module;
fig. 6 is a schematic diagram of the charging system in the embodiment.
The labels in the figure are: 100-a miniaturized wireless charging circuit, 11-a secondary coil, 12-a second capacitor, 13-a third capacitor, 20-a first capacitor, 30-a receiving module, 31-a first main board, 32-a magnetic isolation board, 40-a transmitting module, 41-a primary coil and 42-a second main board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "vertical", "parallel", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As described in the background art, with the development of wireless charging, the influence of charging efficiency and temperature rise on the wireless charging technology in the development direction of miniaturization is large, and in order to effectively overcome these problems, the present embodiment optimizes the wireless charging circuit to achieve the miniaturization of the wireless charging terminal.
The present invention provides a miniaturized wireless charging circuit, a printed circuit board, a terminal and a charging system, which are described in detail below with reference to the accompanying drawings 1 to 6.
Examples
As shown in fig. 1, the present embodiment provides a miniaturized wireless charging circuit 100, the miniaturized wireless charging circuit 100 includes a resonant circuit and a first capacitor (C)20, the resonant circuit receives an alternating current and converts the alternating current into a direct current, and outputs the direct current to a battery in a terminal for storage.
Specifically, the resonant circuit includes a secondary coil 11, a second capacitor 12(Cs), a third capacitor (Cd)13 and a voltage output terminal Vout, where Vout is electrically connected to the battery, and the secondary coil 11 is coupled to a primary coil (not shown) of a power supply terminal to receive power. The method specifically comprises the following steps: the primary coil is electrified, alternating current with a certain frequency generates an electromagnetic induction phenomenon, and the secondary coil generates alternating current with a certain frequency under the action of electromagnetic induction, so that energy is transferred from the power supply end to the secondary coil end to generate alternating current (Vin). The secondary coil 11 is connected in series with the second capacitor 12, the third capacitor 13 is connected in parallel with a circuit in which the secondary coil 11 and the second capacitor 12 are connected in series, and the first capacitor 12 is arranged in parallel with the secondary coil 11. By arranging the first capacitor 12 connected with the secondary coil 11 in parallel, the coupling voltage during coupling between the secondary coil and the primary coil during charging can be reduced, so that the input current of the secondary coil is reduced, the charging efficiency is improved, and the temperature rise is reduced.
In one embodiment, the secondary coil 11 includes a plurality of sequentially wound loop coils, all of which are located on the same plane, and the largest loop coil diameter is 13 ± 0.01mm, so as to achieve miniaturization of the antenna, and thus, the charging circuit can be used in a small-sized terminal such as a charging toothbrush, a portable charging torch, and a charging pen.
In addition, in this embodiment, the number of turns of the secondary coil and the capacitance of each capacitor are not particularly limited, and the specific use environment and the debugging direction are taken as the standard.
Referring to fig. 2, the present embodiment further provides a printed circuit board, the printed circuit board includes a receiving module 30(RX module), the receiving module 30 includes a first main board 31, the miniaturized wireless charging circuit 100 and a magnetic shield 32 attached to the lower surface of the secondary coil 11, and the miniaturized wireless charging circuit 100 and the magnetic shield 32 are connected to one side of the first main board 31, and exemplarily the sizes of the main boards are as follows: 19 ± 0.01mm by 7 ± 0.01 mm.
Similarly, the components and circuits disposed on the motherboard are not particularly limited in this embodiment, and the specific use environment is taken as the standard.
The present embodiment further provides a terminal, which includes the miniaturized wireless charging circuit 100 or the printed circuit board.
As shown in fig. 3 to 5, the present embodiment further provides a charging system, which includes a receiving module 30(RX module) formed by the miniaturized wireless charging circuit, and a transmitting module 40(TX module), wherein the transmitting module 40 and the receiving module 30 cooperate to realize the transfer of electric energy from the transmitting module 40 to the receiving module 30, so as to complete charging. The receiving module 30 includes a secondary coil 11, and the transmitting module 40 includes a primary coil 41 and a second main board 42. In one embodiment, the secondary coil 41 is also circular and all coils are in the same plane, with the outermost coil diameter being 22 ± 0.01 mm. The second main plate 42 has dimensions of 32 ± 0.01mm by 32 ± 0.01 mm. Similarly, the present embodiment is not limited to the components and circuits provided in the second main board 42.
During charging, as shown in fig. 6, alternating current is introduced into the primary coil 41, and the alternating current generates an electromagnetic induction line as shown in the figure, and when the electromagnetic induction line passes through the secondary coil 11 (the secondary coil 41 is preferably located right above or right below the primary coil 41), the secondary coil 41 generates corresponding alternating current, so that charging is realized.
In order to prove that the charging efficiency and the temperature rise of the miniaturized wireless charging circuit are both improved, in this embodiment, battery performance tests are performed on two charging circuits before and after the first capacitor is added, and the test results are shown in tables 1 and 2:
| mode of operation | Charging efficiency (%) |
| Before adding the first capacitor | 35 |
| After adding the first capacitor | 45 |
TABLE 1 charging efficiency test
TABLE 2 charging temperature test
As shown in tables 1 and 2, it can be seen that the charging efficiency of the charging system is improved and the charging temperature rise is improved after the first capacitor is added.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the utility model discloses an optional embodiment, can make up arbitrary a plurality of embodiments to obtain the demand of dealing with different application scenes, all in the protective scope of this application, no longer give unnecessary details here one by one.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A miniaturized wireless charging circuit is characterized by comprising a resonant circuit and a first capacitor, wherein the resonant circuit receives alternating current, converts the alternating current into direct current and outputs the direct current;
the resonance circuit comprises a secondary coil which is coupled with a primary coil of a power supply end;
the first capacitor is arranged in parallel with the secondary coil.
2. The miniaturized wireless charging circuit of claim 1, wherein the resonant circuit further comprises a second capacitor connected in series with the secondary coil, and a third capacitor connected in parallel with a circuit formed by the secondary coil and the second capacitor connected in series.
3. The miniaturized wireless charging circuit of claim 1 or 2, wherein the secondary coil comprises a plurality of sequentially wound ring coils, all the ring coils are located on the same plane, and the diameter of the largest ring coil is 13 ± 0.01 mm.
4. A printed circuit board comprising a miniaturized wireless charging circuit according to any one of claims 1 to 3.
5. A terminal, characterized in that it comprises a miniaturized wireless charging circuit according to any of claims 1 to 3.
6. A charging system comprising a power supply terminal and a terminal according to claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021669437.1U CN212875485U (en) | 2020-08-12 | 2020-08-12 | Miniaturized wireless charging circuit, printed circuit board, terminal and charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021669437.1U CN212875485U (en) | 2020-08-12 | 2020-08-12 | Miniaturized wireless charging circuit, printed circuit board, terminal and charging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212875485U true CN212875485U (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021669437.1U Active CN212875485U (en) | 2020-08-12 | 2020-08-12 | Miniaturized wireless charging circuit, printed circuit board, terminal and charging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212875485U (en) |
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- 2020-08-12 CN CN202021669437.1U patent/CN212875485U/en active Active
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