Wireless charger for smart watch

Abstract

The utility model discloses a wireless charger for smart watch, including equipment casing and face cover, equipment casing and face cover middle are equipped with equipment main body, equipment main body includes the coaxial setting of outer coil and inner coil, the radial outside of outer coil, between outer coil and inner coil and the radial inner side of inner coil all are equipped with annular magnetic core, outer coil and inner coil are connected circuit board through outer coil connecting wire, inner coil connecting wire respectively, circuit board connects input cable, the wireless charger that the utility model provides can be compatible with different size watch, and charging power can keep consistent.

Description

Technical Field

[0001] This utility model belongs to the field of wireless charger technology, specifically relating to a wireless charger for smartwatches. Background Technology

[0002] New electronic products, especially portable electronic products such as smartwatches, are being used more and more in people's work and life. Wireless chargers are used to match them. Wireless charging devices use the principle of electromagnetic induction to charge. In existing wireless charging devices, the transmitting coil adopts a planar arrangement of multiple coils (such as matrix or side-by-side layout). Although this increases the coverage area, the magnetic fields of adjacent coils interfere with each other, forming a weak field area. In addition, the arrangement of multiple coils leads to an increase in overall size, which contradicts the miniaturization requirements of smartwatch chargers. Utility Model Content

[0003] The purpose of this invention is to provide a wireless charger for smartwatches to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wireless charger for smartwatches, comprising a device housing and a face cover, with a device body disposed between the device housing and the face cover, the device body comprising an outer coil and an inner coil coaxially arranged, and an annular magnetic core disposed on the radially outer side of the outer coil, between the outer coil and the inner coil, and on the radially inner side of the inner coil, respectively; the outer coil and the inner coil are respectively connected to a circuit board via an outer coil connecting wire and an inner coil connecting wire, and the circuit board is connected to an input cable.

[0005] Preferably, a fixed bracket is provided in the middle of the annular magnetic core on the radial inner side of the inner coil. A magnet is provided at the end of the fixed bracket near the face cover. A support plate is provided at the middle end of the fixed bracket. The circuit board is placed at the end of the support plate away from the face cover. A connecting block is also provided in the middle of the end of the support plate away from the face cover. The front and rear sides of the connecting block are provided with slots. The slots are used to hold the input cable. A limit plate is provided at the upper end of the slots to limit the input cable.

[0006] Preferably, the outer coil and the inner coil are connected in parallel to the circuit board.

[0007] Preferably, the outer coil and the inner coil have the same inductance.

[0008] Preferably, the annular magnetic core is a PC95 ferrite magnetic sheet.

[0009] The technical effects and advantages of this utility model are as follows: Through the radial gradient distribution of the outer coil and the inner coil, the magnetic field is continuously covered, weak field areas are eliminated, and the size is small. At the same time, due to the setting of the inner and outer double coils, the charger can be adapted to watches of different sizes and the charging power is consistent. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention; Figure 2 This utility model Figure 1 Reverse view diagram; Figure 3 This is a schematic diagram of the charger of this utility model exploding.

[0011] In the diagram: 100 Equipment housing, 200 Face cover, 300 Equipment body, 310 Outer coil, 320 Inner coil, 330 Ring magnetic core, 340 Circuit board, 350 Outer coil connecting wire, 360 Inner coil connecting wire, 400 Input cable, 500 Fixing bracket, 510 Magnet, 520 Support plate, 530 Connecting block, 540 Slot, 550 Limiting plate. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] This utility model provides, for example Figure 1-3 The wireless charger for a smartwatch shown includes a device housing 100 and a face cover 200. A device body 300 is located between the device housing 100 and the face cover 200. The device body 300 includes an outer coil 310 and an inner coil 320 arranged coaxially. A ring-shaped magnetic core 330 is provided on the radially outer side of the outer coil 310, between the outer coil 310 and the inner coil 320, and on the radially inner side of the inner coil 320. The outer coil 310 and the inner coil 320 are connected to a circuit board 340 through an outer coil connecting line 350 and an inner coil connecting line 360, respectively. The circuit board 340 is connected to an input cable 400.

[0014] The faceplate 200 is used to connect the watch for charging. The coaxial outer coil 310 and inner coil 320 can reduce the overall size of the device. The circuit board 340 includes detection and control circuits, which can automatically identify the size of the watch placed on the faceplate 200 and select to activate the outer coil 310 or the inner coil (320) for charging accordingly to ensure optimal charging power. For example, when the watch is large, such as a 42-48mm dial, the outer coil 310 is activated for charging, and when the dial is small, such as 38 or 40mm, the inner coil 320 is activated for charging.

[0015] In this embodiment, a fixed bracket 500 is provided in the middle of the annular magnetic core 330 on the radial inner side of the inner coil 320. A magnet 510 is provided at the end of the fixed bracket 500 near the face cover 200. A support plate 520 is provided at the middle end of the fixed bracket 500. The circuit board 340 is placed at the end of the support plate 520 away from the face cover 200. A connecting block 530 is also provided in the middle of the end of the support plate 520 away from the face cover 200. The front and rear sides of the connecting block 530 are provided with slots 540. The slots 540 are used to hold the input cable 400. A limit plate 550 is provided at the upper end of the slots 540 to limit the input cable 400.

[0016] The fixed bracket 500 near the end of the faceplate 200 is used to support the outer coil 310, the inner coil 320 and the annular magnetic core 330, and the limiting plate 550 is used to prevent the input cable 400 from coming out of the slot 540.

[0017] In this embodiment, the outer coil 310 and the inner coil 320 are connected in parallel with the circuit board 340, and the outer coil 310 and the inner coil 320 have the same inductance.

[0018] Since the outer coil 310 and the inner coil 320 have the same inductance and are connected in parallel, their impedances are matched. When a single coil is working, the circuit board 340 outputs a constant power, ensuring that watches of different sizes receive the same power.

[0019] In this embodiment, the toroidal magnetic core 330 is a PC95 ferrite magnetic sheet.

[0020] The PC95 ferrite toroidal core achieves efficient magnetic field focusing and interference isolation through its high-frequency, low-loss characteristics, supporting the miniaturization and high compatibility of coaxial dual coils.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wireless charger for a smart watch, comprising a device housing (100) and a face cover (200), a device main body (300) being arranged between the device housing (100) and the face cover (200), characterized in that: The main body of the device (300) includes an outer coil (310) and an inner coil (320) arranged coaxially. A ring-shaped magnetic core (330) is provided on the radially outer side of the outer coil (310), between the outer coil (310) and the inner coil (320), and on the radially inner side of the inner coil (320). The outer coil (310) and the inner coil (320) are respectively connected to a circuit board (340) through an outer coil connecting line (350) and an inner coil connecting line (360). The circuit board (340) is connected to an input cable (400).

2. The wireless charger of claim 1, wherein: A fixed bracket (500) is provided in the middle of the annular magnetic core (330) on the radial inner side of the inner coil (320). A magnet (510) is provided at the end of the fixed bracket (500) near the face cover (200). A support plate (520) is provided at the middle end of the fixed bracket (500). The circuit board (340) is placed at the end of the support plate (520) away from the face cover (200). A connecting block (530) is also provided in the middle of the end of the support plate (520) away from the face cover (200). A slot (540) is provided on the front and rear sides of the connecting block (530). The slot (540) is used to snap the input cable (400). A limit plate (550) is provided at the upper end of the slot (540) to limit the input cable (400).

3. The wireless charger of claim 1, wherein: The outer coil (310) and inner coil (320) are connected in parallel to the circuit board (340).

4. The wireless charger of claim 1, wherein: The outer coil (310) and the inner coil (320) have the same inductance.

5. The wireless charger of claim 2, wherein: The toroidal magnetic core (330) is a PC95 ferrite magnetic sheet.

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