Anti-interference foreign matter detection device in a wireless charging system

Abstract

The utility model discloses a kind of anti-interference foreign matter detection devices in wireless charging system, specifically related to wireless charging field, including base, the base upper end is provided with detection coil, the detection coil is provided with several groups, and detection coil outside is sleeved with reinforcing frame, the reinforcing frame is provided with several groups, and the inboard of reinforcing frame is fixedly provided with elastic buffer layer, the reinforcing frame is made of polycarbonate material, and the elastic buffer layer is made of silicone rubber material, the base upper end one side is provided with controller, the controller one side is provided with detector, the detector one side is provided with filter, and the filter one side is provided with switcher. The utility model is by adding reinforcing frame in the detection coil set outside, reinforcing frame uses high-strength, non-magnetic engineering plastic material, and the inboard of reinforcing frame is provided with elastic buffer layer, material is silicone rubber, can absorb external vibration, avoid due to vibration and lead to coil loose influence detection precision.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging, and more specifically, to an anti-interference foreign object detection device in a wireless charging system. Background Technology

[0002] With the continuous advancement of technology, wireless charging technology has been widely used in many fields due to its convenience, such as wireless charging of electric vehicles and wireless charging of mobile phones. A search revealed an existing patent (publication number: CN210011609U) that discloses a wireless charging metal foreign object detection device, comprising: a surface acoustic wave (SAW) sampling unit, a piezoelectric substrate, a thermally conductive adhesive layer, a sound-absorbing material layer, a high-frequency generation circuit, a temperature sensor, a cyclic acquisition circuit, and a SAW detection circuit. The SAW sampling unit is disposed above the piezoelectric substrate and is used to sample the temperature of the upper shell of the wireless charging system's transmitting coil. By adding a piezoelectric substrate inside the transmitting coil, the device and detection method excite the SAW detection temperature change to detect foreign objects, thus solving the problem of potential safety hazards caused by high temperatures due to metal foreign objects on the wireless charging transmitting coil. Moreover, it has strong anti-interference capabilities and can improve the safety of wireless charging of electric vehicles.

[0003] In existing wireless charging systems, the detection coils in the anti-interference foreign object detection devices are not protected by a high-strength frame. The detection coils are easily affected by vibration. Once the fixed position of the detection coils is shifted due to vibration, the relative positional relationship between the coils changes, which will interfere with the originally accurate electromagnetic induction detection mechanism. At the same time, the aforementioned cited patent documents do not propose any solutions to address the above problems. Therefore, an anti-interference foreign object detection device for a wireless charging system is proposed to address the above problems. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an anti-interference foreign object detection device in a wireless charging system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an anti-interference foreign object detection device in a wireless charging system, comprising a base, a detection coil disposed on the upper end of the base, the detection coil being provided in several groups, and a reinforcing frame being sleeved on the outside of the detection coil, the reinforcing frame being provided in several groups, and an elastic buffer layer being fixedly disposed on the inner side of the reinforcing frame.

[0006] Preferably, the reinforcing frame is made of polycarbonate material, and the elastic buffer layer is made of silicone rubber material.

[0007] Preferably, a controller is provided on one side of the upper end of the base, and a detector is provided on one side of the controller.

[0008] Preferably, a filter is provided on one side of the detector, and a switch is provided on the other side of the filter.

[0009] Preferably, a conductor is wound around the outside of the detection coil, and a heat insulation layer is fixedly provided on one side of the outside of the detection coil, the heat insulation layer being made of ceramic fiber material.

[0010] Preferably, an electromagnetic shielding layer is provided on one side of the heat insulation layer, and the electromagnetic shielding layer is made of copper mesh and metal conductive paint material.

[0011] Preferably, a waterproof and dustproof outer shell is provided on one side of the electromagnetic shielding layer, and the waterproof and dustproof outer shell is made of aluminum alloy material.

[0012] The technical effects and advantages of this utility model are as follows: Compared with existing technologies, the anti-interference foreign object detection device in this wireless charging system adds a reinforcing frame to the outside of the detection coil. The reinforcing frame is made of high-strength, non-magnetic engineering plastic, and the inner side of the reinforcing frame is provided with an elastic buffer layer made of silicone rubber, which can absorb external vibrations and prevent the coil from loosening or shifting due to vibrations, thus affecting the detection accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a rear view of the overall structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the reinforced frame structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the location and structure of the heat insulation layer of this utility model.

[0017] The attached diagram is labeled as follows: 1. Base; 2. Detection coil; 3. Conductor; 4. Reinforcing frame; 5. Controller; 6. Detector; 7. Filter; 8. Switch; 9. Elastic buffer layer; 10. Heat insulation layer; 11. Electromagnetic shielding layer; 12. Waterproof and dustproof outer shell. Detailed Implementation

[0018] 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. Example

[0019] As attached Figures 1 to 4 The anti-interference foreign object detection device in the wireless charging system shown includes a base 1, a detection coil 2 is provided on the upper end of the base 1, the detection coil 2 is provided in several groups, and a reinforcing frame 4 is sleeved on the outside of the detection coil 2. The reinforcing frame 4 is provided in several groups, and an elastic buffer layer 9 is fixedly provided on the inner side of the reinforcing frame 4.

[0020] Among them, the reinforcing frame 4 is made of polycarbonate material, which has high strength and impact resistance, can resist external mechanical collisions, prevent the detection coil 2 from deforming due to external pressure, maintain the stability of the relative position between the coils, and at the same time, polycarbonate is a non-magnetic material and does not participate in the electromagnetic induction process, so as to avoid the frame itself generating induced electromotive force to interfere with the detection signal and ensure the accuracy of the detection results. Example

[0021] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 4 As shown below, see details: In a preferred embodiment, the reinforcing frame 4 is made of polycarbonate material, and the elastic buffer layer 9 is made of silicone rubber material; furthermore, by providing the elastic buffer layer 9, which is attached to the inner side of the frame, it can absorb external vibration energy and reduce the displacement of the coil caused by vibration.

[0022] In a preferred embodiment, a controller 5 is provided on one side of the upper end of the base 1, and a detector 6 is provided on one side of the controller 5; furthermore, by providing the detector 6, the coil impedance change is collected in real time and converted into an electrical signal to meet the detection requirements of small-sized foreign objects.

[0023] In a preferred embodiment, a filter 7 is provided on one side of the detector 6, and a switch 8 is provided on the other side of the filter 7; furthermore, by providing the filter 7, noise signals such as power frequency interference and wireless communication frequency bands are effectively filtered out, thereby improving the purity of the effective detection signal.

[0024] In a preferred embodiment, a conductor 3 is wound around the outside of the detection coil 2, and a heat insulation layer 10 is fixedly provided on one side of the outside of the detection coil 2. The heat insulation layer 10 is made of ceramic fiber material. Furthermore, by providing the heat insulation layer 10, the high temperature generated by the wireless charging transmitting coil can be isolated from the outside, so that the operating temperature of the detection coil 2 is maintained below 40°C, avoiding the aging of the coil enameled wire insulation and the drift of the inductance value caused by high temperature.

[0025] In a preferred embodiment, an electromagnetic shielding layer 11 is provided on one side of the heat insulation layer 10. The electromagnetic shielding layer 11 is made of copper mesh and metal conductive paint material. Furthermore, by providing the electromagnetic shielding layer 11, electromagnetic radiation generated by surrounding electronic equipment and industrial equipment can be shielded, preventing the detection coil 2 from generating false induction signals.

[0026] As a preferred embodiment, a waterproof and dustproof shell 12 is provided on one side of the electromagnetic shielding layer 11. The waterproof and dustproof shell 12 is made of aluminum alloy material. Furthermore, by providing the waterproof and dustproof shell 12, rainwater intrusion and dust accumulation can be prevented, making it suitable for complex environments such as outdoor parking lots and industrial workshops.

[0027] The working process of this utility model is as follows: The detection coil 2 consists of multiple coils, each coil wound around a conductor 3 to form a closed loop. When the wireless charging transmitting coil generates an alternating magnetic field, the detection coil 2 generates an induced electromotive force due to electromagnetic induction. If there are no foreign objects in the charging area, the inductance and resistance parameters of the detection coil 2 are stable, and the impedance value is within the preset normal range. When a metallic foreign object enters, eddy currents are generated within the foreign object, and its magnetic field is superimposed on the magnetic field of the transmitting coil, changing the magnetic field distribution around the detection coil 2, causing a significant change in the coil impedance. The detection coil 2 is set into several groups, which are sequentially connected to the detection circuit by the switch 8. Each group of coils independently detects the magnetic field change in the corresponding area. At the same time, the switch 8 controls the on / off of each group of detection coils 2 and the detector 6 according to a preset timing sequence, ensuring that only one group of coils is connected to the circuit at the same time. This design avoids interference from the superposition of signals from multiple groups of coils, ensuring that the impedance change signal obtained by the detector 6 accurately corresponds to a single detection area. The detector 6 collects the impedance change of the detection coil 2 in real time, converting the physical signal into an electrical signal. The filter 7 performs noise reduction processing on the electrical signal, filtering out high-frequency electromagnetic interference and environmental noise, and retaining the effective signal frequency band related to foreign object detection. To improve signal purity, the controller 5 receives the signal output from the filter 7 and calculates the location and possible size of the foreign object based on the sequence and amplitude of changes in multiple coil signals. It then sends control commands to the wireless charging system, such as pausing charging or issuing an alarm. The detection coil 2 is externally fitted with a reinforced frame 4 made of polycarbonate material, with an inner silicone rubber elastic buffer layer 9. The high-strength frame provides rigid support for the coil, while the elastic buffer layer 9 absorbs external vibration energy, reducing displacement and deformation of the coil caused by vibration, ensuring coil stability and maintaining the accuracy of electromagnetic induction detection. Finally, the heat insulation layer 10 on one side of the detection coil 2 is made of ceramic fiber material, isolating the heat generated by the transmitting coil during wireless charging, preventing the detection coil 2 and electronic components from aging due to high temperatures, and ensuring the stability of coil parameters. The electromagnetic shielding layer 11 adopts a composite structure of copper mesh and metal conductive paint, forming a Faraday cage effect to shield external electromagnetic interference, preventing interference signals from causing the detection coil 2 to generate false induced electromotive force, thus improving anti-interference capability. Furthermore, the aluminum alloy shell prevents dust and moisture from entering the device, protecting the detection coil 2 and electronic components from environmental damage.

[0028] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. An anti-interference foreign object detection device in a wireless charging system, comprising a base (1), characterized in that; The base (1) is provided with a detection coil (2) at its upper end. The detection coil (2) is provided with several sets. A reinforcing frame (4) is sleeved on the outside of the detection coil (2). The reinforcing frame (4) is provided with several sets. An elastic buffer layer (9) is fixedly provided on the inner side of the reinforcing frame (4).

2. The anti-interference foreign object detection device in a wireless charging system according to claim 1, characterized in that: The reinforcing frame (4) is made of polycarbonate material, and the elastic buffer layer (9) is made of silicone rubber material.

3. The anti-interference foreign object detection device in a wireless charging system according to claim 1, characterized in that: A controller (5) is provided on one side of the upper end of the base (1), and a detector (6) is provided on one side of the controller (5).

4. The anti-interference foreign object detection device in a wireless charging system according to claim 3, characterized in that: A filter (7) is provided on one side of the detector (6), and a switch (8) is provided on one side of the filter (7).

5. The anti-interference foreign object detection device in a wireless charging system according to claim 1, characterized in that: The detection coil (2) is wound with a conductor (3) on the outside, and a heat insulation layer (10) is fixedly provided on one side of the detection coil (2), the heat insulation layer (10) being made of ceramic fiber material.

6. The anti-interference foreign object detection device in a wireless charging system according to claim 5, characterized in that: An electromagnetic shielding layer (11) is provided on one side of the heat insulation layer (10), and the electromagnetic shielding layer (11) is made of copper mesh and metal conductive paint material.

7. The anti-interference foreign object detection device in a wireless charging system according to claim 6, characterized in that: A waterproof and dustproof shell (12) is provided on one side of the electromagnetic shielding layer (11), and the waterproof and dustproof shell (12) is made of aluminum alloy material.

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