Wireless transmission system and wireless terminal device

Abstract

The present disclosure provides a wireless transmission system and a wireless terminal device, and belongs to the technical field of wireless transmission. The wireless transmission system comprises a first spiral arm, a second spiral arm, a feeding circuit, a rectifier circuit and a battery, and the first spiral arm is embedded in the second spiral arm. The first spiral arm has a first terminal and a second terminal arranged along a first direction, and the second spiral arm has a third terminal and a fourth terminal arranged along the first direction. The first direction is parallel to the axis of the first spiral arm. The feeding circuit is electrically connected with the first terminal and the third terminal, and the rectifier circuit is electrically connected with the first terminal, the fourth terminal and the battery. The rectifier circuit comprises a capacitor. When the feeding circuit works, the wireless transmission system can receive or send signals. When the rectifier circuit works, the wireless transmission system can charge or discharge the battery. In this way, the wireless transmission system can not only serve as an antenna, but also as a charging coil, so that the overall size of the antenna and the charging coil is relatively small.

Description

Technical Field

[0001] This disclosure relates to the field of wireless transmission technology, and in particular to a wireless transmission system and terminal device. Background Technology

[0002] With the diversification of functions in wireless terminal devices, wireless communication and wireless charging have become essential needs for consumers. Current product solutions use antennas as the electromagnetic wave transmitting and receiving structure for wireless communication, and coils as the power transmission structure for wireless charging.

[0003] However, as terminal devices become increasingly miniaturized, the internal space within them also decreases. If the overall size of the antenna and coil is too large, it becomes difficult to incorporate them into the terminal device. Therefore, reducing the overall size of the antenna and coil is a key issue that needs to be addressed. Utility Model Content

[0004] This disclosure provides a wireless transmission system and a wireless terminal device that can solve the technical problems existing in related technologies. The technical solutions of the wireless transmission system and the wireless terminal device are as follows.

[0005] In a first aspect, this disclosure provides a wireless transmission system, which includes a first spiral arm, a second spiral arm, a power supply circuit, a rectifier circuit, and a battery.

[0006] The first spiral arm is embedded in the second spiral arm. The first spiral arm has a first terminal and a second terminal arranged along a first direction. The second spiral arm has a third terminal and a fourth terminal arranged along the first direction. The first direction is parallel to the axis of the first spiral arm.

[0007] The two ends of the power supply circuit are electrically connected to the first terminal and the third terminal, respectively. The two ends of the rectifier circuit are electrically connected to the first terminal and the fourth terminal, respectively. The rectifier circuit is also electrically connected to the battery. The rectifier circuit includes a capacitor.

[0008] In one possible implementation, the phase difference between the first spiral arm and the second spiral arm is 180°.

[0009] In one possible implementation, when the power supply circuit is operating, the signal frequency radiated by the first spiral arm and the second spiral arm is 2.4 GHz.

[0010] In one possible implementation, the first terminal of the first spiral arm is flush with the third terminal of the second spiral arm, and the second terminal of the first spiral arm is flush with the fourth terminal of the second spiral arm.

[0011] In one possible implementation, let the outer diameters of the first spiral arm and the second spiral arm be D, then 4mm ≤ D ≤ 8mm.

[0012] In one possible implementation, let the lengths of the first spiral arm and the second spiral arm be L, then 15mm ≤ L ≤ 20mm.

[0013] In one possible implementation, the number of turns of the first spiral arm and the number of turns of the second spiral arm are 3-20.

[0014] In one possible implementation, both the first spiral arm and the second spiral arm are copper sheets.

[0015] In one possible implementation, the thickness of the copper sheet is 0.5mm-1mm.

[0016] In a second aspect, this disclosure also provides a wireless terminal device, the wireless terminal device including the wireless transmission system as described in any of the first aspects.

[0017] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0018] This disclosure provides a wireless transmission system. When the feed circuit is operating, the first and second spiral arms form a double-helix antenna, enabling the wireless transmission system to receive or transmit signals. When the wireless transmission system transmits a signal, the feed circuit provides alternating current to the first and second spiral arms, generating electromagnetic waves between them and radiating them outwards. When the wireless transmission system receives a signal, the first and second spiral arms receive the electromagnetic waves, generate electrical signals in the magnetic field, and transmit these signals to the feed circuit. When the rectifier circuit is operating, the first and second spiral arms form an open-circuit charging coil. The inductance of the first and second spiral arms and the capacitance in the rectifier circuit can form an LC resonance, enabling the wireless transmission system to charge or discharge. When the wireless transmission system is charging, the first and second spiral arms generate induced current under the influence of an external magnetic field and transmit this current to the rectifier circuit. When the wireless transmission system is discharging, the rectifier circuit provides alternating current to the first and second spiral arms, causing them to generate magnetic fields. Thus, the wireless transmission system can achieve both wireless communication and wireless charging. In other words, the wireless transmission system can function as both an antenna and a charging coil. This allows for a smaller overall size of both the antenna and the charging coil, which is beneficial for implementing wireless charging and wireless communication in smaller terminal devices.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a first spiral arm and a second spiral arm according to an embodiment of this disclosure;

[0022] Figure 2 This is a schematic diagram of the structure of a wireless transmission system shown in an embodiment of this disclosure;

[0023] Figure 3 This is a schematic diagram of the structure of a wireless transmission system shown in an embodiment of this disclosure.

[0024] Legend:

[0025] 1. First spiral arm; 1a. First terminal; 1b. Second terminal;

[0026] 2. Second spiral arm, 2a. Third terminal, 2b. Fourth terminal;

[0027] 3. Power supply circuit;

[0028] 4. Rectifier circuit;

[0029] 5. Battery.

[0030] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0032] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0033] This disclosure provides a wireless transmission system, such as... Figure 1 and Figure 2 As shown, the wireless transmission system includes a first spiral arm 1, a second spiral arm 2, a power supply circuit 3, a rectifier circuit 4, and a battery 5. The first spiral arm 1 is embedded in the second spiral arm 2. The first spiral arm 1 has a first terminal 1a and a second terminal 1b arranged along a first direction, and the second spiral arm 2 has a third terminal 2a and a fourth terminal 2b arranged along the first direction. The first direction is parallel to the axis of the first spiral arm 1. The two ends of the power supply circuit 3 are electrically connected to the first terminal 1a and the third terminal 2a, respectively. The two ends of the rectifier circuit 4 are electrically connected to the first terminal 1a and the fourth terminal 2b, respectively. The rectifier circuit 4 is also electrically connected to the battery 5, and includes a capacitor.

[0034] In this configuration, the axis of the first helical arm 1 coincides with the axis of the second helical arm 2, and the first helical arm 1 and the second helical arm 2 are arranged in the form of a double helical antenna. The first helical arm 1 and the second helical arm 2 have the same structure, that is, the number of turns, inner diameter, and pitch of the first helical arm 1 and the second helical arm 2 can all be the same.

[0035] The two ends of the power supply circuit 3 can also be electrically connected to the second terminal 1b and the fourth terminal 2b respectively, and the two ends of the rectifier circuit 4 can also be electrically connected to the second terminal 1b and the third terminal 2a respectively.

[0036] The technical solution provided in this embodiment of the invention, when the feed circuit 3 is working, the first spiral arm 1 and the second spiral arm 2 constitute a double-helix antenna, enabling the wireless transmission system to receive or transmit signals. When the wireless transmission system transmits a signal, the feed circuit 3 provides alternating current to the first spiral arm 1 and the second spiral arm 2, causing electromagnetic waves to be generated between the first spiral arm 1 and the second spiral arm 2, and radiating the electromagnetic waves outward. When the wireless transmission system receives a signal, the first spiral arm 1 and the second spiral arm 2 receive the electromagnetic waves, generate electrical signals in the magnetic field, and send the signals to the feed circuit 3. Figure 3 As shown, when the rectifier circuit 4 is working, the first spiral arm 1 and the second spiral arm 2 constitute the terminal open-circuit charging coil. The inductance of the first spiral arm 1 and the second spiral arm 2 themselves, along with the capacitor in the rectifier circuit, can form an LC resonance, enabling the wireless transmission system to charge or discharge the battery 5. When the wireless transmission system is charging, the first spiral arm 1 and the second spiral arm 2 generate an induced current under the influence of an external magnetic field, and transmit the current to the rectifier circuit 4, and then to the battery 5. When the wireless transmission system is discharging, the rectifier circuit 4 provides alternating current to the first spiral arm 1 and the second spiral arm 2, causing the first spiral arm 1 and the second spiral arm 2 to generate a magnetic field. In this way, the wireless transmission system can realize both wireless communication and wireless charging. That is, the wireless transmission system can act as both an antenna and a charging coil. This makes the overall size of the antenna and the charging coil relatively small, which is beneficial for realizing wireless charging and wireless communication in a small terminal device.

[0037] In some examples, the phase difference between the first helical arm 1 and the second helical arm 2 is 180°. That is, the first helical arm 1 can be rotated 180° along the axis to coincide with the second helical arm 2. Thus, when the first helical arm 1 and the second helical arm 2 function as an antenna, their radiated fields are in phase and superimposed along the axial direction (directly in front of the antenna), while being weakened in other directions due to phase cancellation, thereby improving the antenna's directivity and positive gain. Furthermore, it can reduce common-mode current in the feed line, reduce structural interference with the radiation mode, and improve impedance matching.

[0038] In some examples, when the power supply circuit 3 is operating, the signal frequency radiated by the first spiral arm 1 and the second spiral arm 2 is 2.4 GHz. This enables the wireless transmission system to send or receive Bluetooth signals, thereby establishing wireless connections with other devices.

[0039] Specifically, the signal frequencies radiated by the first spiral arm 1 and the second spiral arm 2 can be set according to actual needs. For example, if the wireless transmission system can be used as an NFC (Near Field Communication) antenna, then the signal frequency radiated by the first spiral arm 1 and the second spiral arm 2 is 13.56Hz.

[0040] In some examples, such as Figure 1 and Figure 2 As shown, the first terminal 1a of the first spiral arm 1 is flush with the third terminal 2a of the second spiral arm 2, and the second terminal 1b of the first spiral arm 1 is flush with the fourth terminal 2b of the second spiral arm 2. This reduces the axial space occupied by the first spiral arm 1 and the second spiral arm 2 as a whole.

[0041] Of course, in other examples, the first terminal 1a of the first spiral arm 1 and the third terminal 2a of the second spiral arm 2 may not be flush, and this embodiment does not specifically limit this.

[0042] In some examples, such as Figure 1 As shown, let D be the outer diameter of the first spiral arm 1 and the outer diameter of the second spiral arm 2, then 4mm ≤ D ≤ 8mm. This makes the radial space occupied by the first spiral arm 1 and the second spiral arm 2 relatively small.

[0043] Specifically, the outer diameter of the first spiral arm 1 and the outer diameter of the second spiral arm 2 can be set to D according to the specific internal dimensions of the wireless terminal device.

[0044] In some examples, such as Figure 1 As shown, let the length of the first helical arm 1 and the length of the second helical arm 2 be L, then 15mm ≤ L ≤ 20mm. This makes the space occupied by the first helical arm 1 and the second helical arm 2 in the axial direction relatively small.

[0045] Specifically, the length of the first spiral arm 1 and the length of the second spiral arm 2 can be set to L according to the specific internal dimensions of the wireless terminal device.

[0046] It should be noted that, since the first spiral arm 1 and the second spiral arm 2 need to transmit or receive signals in the Bluetooth frequency band, the circumference of the first spiral arm 1 and the circumference of the second spiral arm 2 are fixed. Therefore, the outer diameter D of the first spiral arm 1 and the second spiral arm 2 is inversely proportional to the length L of the first spiral arm 1 and the second spiral arm 2.

[0047] In some examples, the number of turns of the first helical arm 1 and the second helical arm 2 is 3-20. If the number of turns of the first helical arm 1 and the second helical arm 2 is too small, the range of the radiated signal of the first helical arm 1 and the second helical arm 2 will be small. If the number of turns of the first helical arm 1 and the second helical arm 2 is too large, the space occupied by the first helical arm 1 and the second helical arm 2 in the axial direction will be large.

[0048] In some examples, both the first spiral arm 1 and the second spiral arm 2 are made of copper sheets. Copper sheets have high conductivity, which reduces current loss during wireless charging or discharging. Furthermore, copper sheets have excellent high-frequency performance, making them compatible with Bluetooth frequency bands, and they also reduce signal reflection, improving transmission efficiency.

[0049] In some examples, the copper sheet thickness is 0.5mm-1mm. This allows the first spiral arm 1 and the second spiral arm 2 to have greater strength, eliminating the need for other supporting components between the first spiral arm 1 and the second spiral arm 2, thus reducing the number of parts in the wireless transmission device.

[0050] This disclosure also provides a wireless terminal device, which includes the wireless transmission system described above.

[0051] The wireless terminal device can be a stylus. Because the stylus has a relatively long axial length and a relatively small radial width, the first helical arm 1 and the second helical arm 2 are positioned along the axial direction of the stylus. The axis of the first helical arm 1 can coincide with the axis of the stylus.

[0052] In other examples, the wireless terminal device may also be a mobile phone or a tablet computer.

[0053] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A wireless transmission system, characterized in that, The wireless transmission system includes a first spiral arm (1), a second spiral arm (2), a power supply circuit (3), a rectifier circuit (4), and a battery (5); The first spiral arm (1) is embedded in the second spiral arm (2). The first spiral arm (1) has a first terminal (1a) and a second terminal (1b) arranged along a first direction. The second spiral arm (2) has a third terminal (2a) and a fourth terminal (2b) arranged along the first direction. The first direction is parallel to the axis of the first spiral arm (1). The two ends of the power supply circuit (3) are electrically connected to the first terminal (1a) and the third terminal (2a) respectively. The two ends of the rectifier circuit (4) are electrically connected to the first terminal (1a) and the fourth terminal (2b) respectively. The rectifier circuit (4) is also electrically connected to the battery (5). The rectifier circuit (4) includes a capacitor.

2. The wireless transmission system according to claim 1, characterized in that, The phase difference between the first spiral arm (1) and the second spiral arm (2) is 180°.

3. The wireless transmission system according to claim 1, characterized in that, When the power supply circuit (3) is working, the signal frequency radiated by the first spiral arm (1) and the second spiral arm (2) is 2.4 GHz.

4. The wireless transmission system according to claim 1, characterized in that, The first terminal (1a) of the first spiral arm (1) is flush with the third terminal (2a) of the second spiral arm (2), and the second terminal (1b) of the first spiral arm (1) is flush with the fourth terminal (2b) of the second spiral arm (2).

5. The wireless transmission system according to claim 1, characterized in that, Let the outer diameter of the first spiral arm (1) and the outer diameter of the second spiral arm (2) be D, then 4mm ≤ D ≤ 8mm.

6. The wireless transmission system according to claim 1, characterized in that, Let the length of the first spiral arm (1) and the length of the second spiral arm (2) be L, then 15mm≤L≤20mm.

7. The wireless transmission system according to claim 1, characterized in that, The number of turns of the first spiral arm (1) and the number of turns of the second spiral arm (2) are 3-20.

8. The wireless transmission system according to claim 1, characterized in that, Both the first spiral arm (1) and the second spiral arm (2) are copper sheets.

9. The wireless transmission system according to claim 8, characterized in that, The thickness of the copper sheet is 0.5mm-1mm.

10. A wireless terminal device, characterized in that, The wireless terminal device includes the wireless transmission system as described in any one of claims 1-9.

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