Visual display device for magnetic field intensity of wireless charging coil

Abstract

The utility model provides a wireless charging coil magnetic field intensity visual display device, and relates to the field of wireless charging coil magnetic field detection. The wireless charging coil magnetic field intensity visual display device provided by the utility model comprises a bottom plate and a plurality of coil assemblies, and the coil assemblies are arranged on the bottom plate in an array; the coil assembly comprises a printed circuit board, a light-emitting diode and at least one capacitor are arranged on the front face of the printed circuit board, the capacitor and the light-emitting diode are connected in parallel through a wire and form an LC parallel resonance circuit, the resonance frequency of the LC parallel resonance circuit is the same as that of an external magnetic field to be measured, and the light-emitting diode is used for displaying the magnetic field intensity of an external magnet. The device can directly observe the external magnetic field intensity and range to be measured, is low in cost, can be produced in batches, and is simple and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of magnetic field detection of wireless charging coils, and in particular to a visualization display device for the magnetic field strength of wireless charging coils. Background Technology

[0002] Magnetic field detection technology has significant application value in industrial measurement, electronic equipment monitoring, and scientific research experiments. Traditional magnetic field detection methods typically rely on Hall effect sensors, magnetoresistive elements, or induction coils combined with complex signal processing circuits. While these solutions offer high accuracy, they have significant limitations: First, the detection system requires specialized instruments to analyze electrical signals, making it difficult to intuitively present the magnetic field distribution. Second, fixed sensor arrays are difficult to adapt flexibly to magnetic field scenarios with varying intensities and ranges; redesigning or adjusting the array size significantly increases cost and time. Third, existing visualization solutions mostly rely on electronic displays or software imaging, resulting in high hardware costs and specialized operational requirements. Therefore, there is an urgent need for a detection solution that can intuitively indicate magnetic field strength and range, support rapid deployment, and offer cost advantages. In response to these needs, the field has recently begun exploring innovative paths combining modularity and visualization; however, existing technologies have not effectively solved core problems such as poor adaptability of detection units and the lack of intuitive feedback mechanisms.

[0003] Against this backdrop, developing a detection device that can be adapted to multiple scenarios through modular expansion and directly map magnetic field characteristics using optical signals has become an important direction for improving the efficiency and practicality of magnetic field detection. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a visualization display device for the magnetic field strength of a wireless charging coil, which allows direct observation of the strength and range of the external magnetic field to be measured. It is low in cost, can be mass-produced, and is simple and convenient to use.

[0005] The present invention provides a wireless charging coil magnetic field strength visualization display device, comprising a base plate and multiple coil assemblies arranged in an array on the base plate; each coil assembly includes a printed circuit board, the front side of which is provided with a light-emitting diode and at least one capacitor, the capacitor and the light-emitting diode being connected in parallel by wires to form an LC parallel resonant circuit, the resonant frequency of the LC parallel resonant circuit being the same as that of the external magnetic field to be measured, and the light-emitting diode being used to display the magnetic field strength of the external magnet.

[0006] In one feasible embodiment, the printed circuit board is provided with a first capacitor, a second capacitor and a third capacitor connected in parallel. The capacitance value of the first capacitor is 1nF to 100pF, the capacitance value of the second capacitor is 1nF to 100pF, the capacitance value of the third capacitor is 1nF to 100pF, and the resonant frequency of the coil assembly is 5 to 8MHz.

[0007] In one feasible embodiment, the conductor includes a spiral conductor disposed on the front side of the printed circuit board and a straight conductor disposed on the back side of the printed circuit board. The spiral conductor is spirally coiled around the front side of the printed circuit board, and the light-emitting diode is located in the central area of ​​the front side of the printed circuit board.

[0008] In one feasible embodiment, the spiral wire is wound 3 to 6 times, and the pitch of the spiral wire is 0.5 to 1.5 mm.

[0009] In one feasible embodiment, the printed circuit board is circular in shape and has a diameter of 10-20 mm.

[0010] In one feasible embodiment, the spacing between adjacent coil assemblies is 10 to 20 mm.

[0011] In one feasible embodiment, the array has 10 to 15 rows and 10 to 15 columns.

[0012] In one feasible embodiment, the length of the base plate is 100-300mm and the width of the base plate is 100-300mm.

[0013] In one feasible embodiment, one or more resistors are also connected in series in the LC parallel resonant circuit.

[0014] In one feasible embodiment, the base plate is made of epoxy resin.

[0015] The wireless charging coil magnetic field strength visualization display device provided by this utility model has the following beneficial effects:

[0016] 1) The coil assembly in this utility model adopts a modular design and can be assembled into detection arrays of different sizes. Therefore, this utility model can directly observe the strength and range of the external magnetic field to be measured by the light intensity of the light-emitting diodes in different coil assemblies. This magnetic field indication method is not only low in cost and mass-producible, but also simple and convenient to use.

[0017] 2) Furthermore, depending on the different external magnetic fields to be measured, the modular coil assembly can be replaced so that the coil assembly can be adapted to the external magnetic field to be measured. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the coil assembly in this utility model.

[0019] Figure 2 This is a side view of the coil assembly in this utility model.

[0020] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure Labels

[0022] Base plate 1

[0023] Coil assembly 2

[0024] Printed Circuit Board 21

[0025] LED 22

[0026] Capacitor 23

[0027] First capacitor 23.1

[0028] The second capacitor is 23.2.

[0029] The third capacitor is 23.3.

[0030] Wire 24

[0031] 24.1 helical wire

[0032] Straight-through wire 24.2 Detailed Implementation

[0033] 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 skilled in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, it should be noted that the terms "left side", "right side", "upper side", "lower side", "above", "below", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] This utility model provides a visualization display device for the magnetic field strength of a wireless charging coil, see reference. Figure 1The system includes a base plate 1 and multiple coil assemblies 2 arranged in an array on the base plate 1. Each coil assembly 2 includes a printed circuit board 21. The front side of the printed circuit board 21 has a light-emitting diode 22 and at least one capacitor 23. The capacitor 23 and the light-emitting diode 22 are connected in parallel via a wire 24 to form an LC parallel resonant circuit. The wire 24 is the inductor. The resonant frequency of the LC parallel resonant circuit is the same as that of the external magnetic field to be measured. The light-emitting diode 22 is used to display the magnetic field strength of the external magnet. For illustration, the external magnetic field to be measured is an alternating magnetic field. Therefore, according to Faraday's law of electromagnetic induction, when a coil assembly 2 is located within the range of the external magnetic field to be measured, an induced current will be generated in the wire 24 of that coil assembly 2, causing the LC parallel resonant circuit to conduct. After conduction, the light-emitting diode 22 will emit light. The wavelength of the light emitted by the light-emitting diode 22 is the visible light band, preferably 500–600 nm. Meanwhile, since different coil components 2 are positioned differently relative to the external magnetic field to be measured, the induced current generated by the wires 24 in different coil components 2 is also different. The magnitude of the induced current directly affects the power of the light-emitting diode 22, and the power of the light-emitting diode 22 can be intuitively judged by the intensity of the light emitted by the light-emitting diode 22. Therefore, when the range of the external magnetic field to be measured covers most of the coil components 2, the range of the magnetic field to be measured can be intuitively inferred based on the intensity of the light emitted by different coil components 2. Similarly, when the position of the external magnetic field to be measured moves, the position of each coil component 2 relative to the external magnetic field will also change, thereby changing the magnitude of the induced current generated in the wires 24. Therefore, when the external magnetic field to be measured moves, the intensity of the external magnetic field to be measured can be qualitatively detected by the change in the intensity of the light emitted by the light-emitting diodes 22 in different coil components 2. The so-called qualitative detection refers to roughly judging which area of ​​the external magnetic field has a larger magnetic induction intensity and which area has a smaller magnetic induction intensity. The coil assembly 2 in this invention adopts a modular design and can be assembled into detection arrays of varying sizes. Therefore, this invention can directly observe the strength and range of the external magnetic field to be measured by observing the light emission intensity of the LEDs 22 in different coil assemblies 2. This magnetic field indication method is not only low-cost and mass-producible, but also simple and convenient to use. Furthermore, depending on the different external magnetic fields to be measured (mainly the range and size of the magnetic field), the modular coil assembly 2 can be replaced, thereby enabling the coil assembly 2 to be adapted to the external magnetic field to be measured (adaptation generally means that the magnitude of the induced current generated in the guide wire 24 is sufficient to enable the LEDs 22 to reach their rated power).

[0037] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1The printed circuit board 21 has a first capacitor 23.1, a second capacitor 23.2, and a third capacitor 23.3 connected in parallel. The capacitance values ​​of the first capacitor 23.1, the second capacitor 23.2, and the third capacitor 23.3 are all 1nF to 100pF. The resonant frequency of the coil assembly 2 is 5 to 8MHz. For illustration, when the frequency of the external magnetic field matches the resonant frequency of the coil assembly 2, the LC parallel resonant circuit amplifies the signal of the light-emitting diode 22 by a factor of Q, where Q is the quality factor, making the light emitted by the light-emitting diode 22 easier to observe.

[0038] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The conductor 24 includes a spiral conductor 24.1 disposed on the front side of the printed circuit board 21 and a straight conductor 24.2 disposed on the back side of the printed circuit board 21. The spiral conductor 24.1 is spirally coiled around the front side of the printed circuit board 21, and the light-emitting diode 22 is located in the central area of ​​the front side of the printed circuit board 21.

[0039] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The spiral wire 24.1 is wound in 3 to 6 turns, and the pitch of the spiral wire 24.1 is 0.5 to 1.5 mm.

[0040] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The printed circuit board 21 is circular in shape and has a diameter of 10-20 mm.

[0041] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The spacing between adjacent coil assemblies 2 is 10–20 mm. For illustrative purposes, please refer to [reference needed]. Figure 1 When coil assembly 2 is circular, the interval between adjacent coil assemblies 2 should be understood as the center distance.

[0042] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The array has 10 to 15 rows and 10 to 15 columns.

[0043] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The base plate 1 has a length of 100-300mm and a width of 100-300mm.

[0044] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The LC parallel resonant circuit also includes one or more resistors connected in series.

[0045] In the wireless charging coil magnetic field strength visualization display device provided by this utility model, see [reference needed]. Figure 1 The base plate 1 is made of epoxy resin.

[0046] Example 1

[0047] In this embodiment, the light emitted by the LED 22 has a wavelength of nm. The printed circuit board 21 has a first capacitor 23.1, a second capacitor 23.2, and a third capacitor 23.3 connected in parallel. The capacitance of the first capacitor 23.1 is 1 nF, the capacitance of the second capacitor 23.2 is 10 pF, and the capacitance of the third capacitor 23.3 is 100 pF. The resonant frequency of the coil assembly 2 is 6.78 MHz. The spiral wire 24.1 has 4.7 turns and a pitch of 1 mm. The printed circuit board 21 is circular with a diameter of 15 mm. The spacing between adjacent coil assemblies 2 is 15 mm. The array has 13 rows and 13 columns. The base plate 1 has a length of 200 mm and a width of 200 mm. This embodiment can be used to test the magnitude of the alternating magnetic field of a wireless charging coil, and the intensity and range of the external magnetic field to be tested can be directly observed by the light intensity of the light-emitting diodes 22 in different coil components 2. This magnetic field indication method is not only low in cost and can be mass-produced, but also simple and convenient to use.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A wireless charging coil magnetic field strength visual display device, characterized by: The application relates to a coil assembly (2) comprising a base plate (1) and a plurality of coil assemblies (2) arranged in an array on the base plate (1); the coil assembly (2) comprises a printed circuit board (21), the front surface of the printed circuit board (21) is provided with a light emitting diode (22) and at least one capacitor (23), the capacitor (23) and the light emitting diode (22) are connected in parallel through a wire (24) and form an LC parallel resonance circuit, the resonance frequency of the LC parallel resonance circuit is the same as that of an external magnetic field to be measured, and the light emitting diode (22) is used for displaying the magnetic field strength of an external magnet.

2. The wireless charging coil magnetic field strength visual display device of claim 1, wherein: The printed circuit board (21) is provided with a first capacitor (23.1), a second capacitor (23.2) and a third capacitor (23.3) connected in parallel with each other, the capacitance of the first capacitor (23.1) is 1nf-100pf, the capacitance of the second capacitor (23.2) is 1nf-100pf, the capacitance of the third capacitor (23.3) is 1nf-100pf, and the resonance frequency of the coil assembly (2) is 5-8MHz. 3.The wireless charging coil magnetic field strength visual display device of claim 1 or 2, wherein: The wire (24) comprises a spiral wire (24.1) arranged on the front surface of the printed circuit board (21) and a straight-through wire (24.2) arranged on the back surface of the printed circuit board (21), the spiral wire (24.1) is spirally wound on the front surface of the printed circuit board (21), and the light emitting diode (22) is located in the central region of the front surface of the printed circuit board (21).

4. The wireless charging coil magnetic field strength visual display device of claim 3, wherein: The number of turns of the spiral wire (24.1) is 3-6 turns, and the pitch of the spiral wire (24.1) is 0.5-1.5mm.

5. The wireless charging coil magnetic field strength visualisation display apparatus of any of claims 1, 2 and 4, wherein: The shape of the printed circuit board (21) is circular, and the diameter of the printed circuit board (21) is 10-20mm.

6. The wireless charging coil magnetic field strength visual display device of any one of claims 1, 2, and 4, wherein: The interval between adjacent coil assemblies (2) is 10-20mm.

7. The wireless charging coil magnetic field strength visualisation display apparatus of any of claims 1, 2 and 4, wherein: The number of rows of the array is 10-15 rows, and the number of columns of the array is 10-15 columns.

8. The wireless charging coil magnetic field strength visual display device of any one of claims 1, 2, and 4, wherein: The length of the base plate (1) is 100-300mm, and the width of the base plate (1) is 100-300mm.

9. The wireless charging coil magnetic field strength visual display device of claim 1, wherein: One or more resistors are further connected in series in the LC parallel resonance circuit.

10. The wireless charging coil magnetic field strength visual display device of claim 1, wherein: The material of the base plate (1) is epoxy resin.

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