Nanocrystalline magnetism-isolating sheet coil receiving module

Abstract

The utility model relates to a nanocrystalline magnetic isolation sheet coil receiving module. The nanocrystalline magnetic isolation sheet coil receiving module comprises an iron-based nanocrystalline magnetic sheet, one end of the iron-based nanocrystalline magnetic sheet is connected with a coil; the coil is connected with a pin; the pins extend out towards the direction of the outer side of the iron-based nanocrystalline magnetic sheet; the transformer further comprises a protection film set which is attached to the two ends of the iron-based nanocrystalline magnetic sheet and covers the coil and the pins. The magnetic sheet of the receiving module adopts the iron-based nanocrystalline magnetic sheet, and compared with a ferrite magnetic sheet in the existing market, the iron-based nanocrystalline magnetic sheet has relatively high magnetic conductivity and high bound magnetic field intensity, so that the magnetic flux of a receiving end is enhanced, and the loss of a transmitting end is reduced; and interference of a transmitting terminal magnetic field on an electronic product and the outside can be isolated, and charging efficiency is high. Meanwhile, the overall thickness of the iron-based nanocrystalline magnetic sheet is small, so that the iron-based nanocrystalline magnetic sheet is more suitable for being used in an electronic product with a compact structure, and an enough thickness allowance setting space is reserved for a double-sided full-coverage protective film group.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging coils, in particular to a nanocrystalline magnetic isolation sheet coil receiving module. Background Art

[0002] The wireless charging receiving coil is one of the key components in the wireless charging system, which is used to receive the electrical energy transmitted from the charging source (usually a charging pad or charger). It is generally composed of a conductive coil, an insulating material, and an outer packaging. With the development of the wireless charging field and the formulation of wireless charging standards, wireless charging receiving coils are currently assembled into finished products. The receiving distance of the finished products is generally achieved by increasing the magnetic field strength of the transmitting end, or increasing the coil on the receiving end to receive a larger magnetic flux, but this will increase the corresponding volume and is not suitable for use in small electronic products. In addition, the coating protection of the existing film group is only attached to both sides of the ferrite magnetic sheet, which has little effect on the insulation and protection of the coil and is not suitable for outdoor use. Therefore, improvement is needed. Utility Model Content

[0003] Based on this, the utility model provides a nanocrystalline magnetic isolation sheet coil receiving module to solve the above problems.

[0004] In order to achieve the purpose of the utility model, the utility model adopts the following technical solutions:

[0005] A nanocrystalline magnetic isolation sheet coil receiving module includes: an iron-based nanocrystalline magnetic sheet; a coil connected to one end of the iron-based nanocrystalline magnetic sheet; a pin connected to the coil; the pin extends outward from the iron-based nanocrystalline magnetic sheet; and a protective film group, which is attached to both ends of the iron-based nanocrystalline magnetic sheet and covers the coil and the pin.

[0006] Furthermore, the protective film group is a PET black film.

[0007] Furthermore, the protective film group is provided with a backing adhesive, and is attached to the iron-based nanocrystalline magnetic sheet through the backing adhesive.

[0008] Furthermore, the protective film group includes a first film body, a second film body and a third film body; the first film body is connected to an end surface of the iron-based nanocrystalline magnetic sheet facing away from the coil; the second film body is connected to an end of the coil away from the iron-based nanocrystalline magnetic sheet, and covers the iron-based nanocrystalline magnetic sheet, and is provided with an avoidance gap for the pin to extend out; the third film body covers the avoidance gap.

[0009] Furthermore, a double-sided adhesive layer is attached to one end surface of the iron-based nanocrystalline magnetic sheet adjacent to the coil.

[0010] Furthermore, a glue connection layer is provided between the double-sided adhesive layer and the magnetic sheet.

[0011] Furthermore, the pin sleeve is provided with a heat shrink tube.

[0012] Furthermore, a parylene coating is provided on the surface of the coil.

[0013] Furthermore, a release film is provided on the other end surface of the protective film group opposite to the coil.

[0014] Furthermore, an NTC thermistor is included; the NTC thermistor is arranged at the center of the coil, and the resistance wiring connected to the NTC thermistor extends toward the outside of the iron-based nanocrystalline magnetic sheet.

[0015] The beneficial effects of the utility model are:

[0016] 1. High charging efficiency and thin overall thickness. The magnetic sheet of this receiving module adopts iron-based nanocrystalline magnetic sheet. Compared with the ferrite magnetic sheet on the existing market, the iron-based nanocrystalline magnetic sheet has higher magnetic permeability and greater binding magnetic field strength, thereby enhancing the magnetic flux at the receiving end and reducing the loss at the transmitting end; it can also isolate the transmitting end magnetic field from electronic products and external interference, and has high charging efficiency. At the same time, the overall thickness of the iron-based nanocrystalline magnetic sheet is small, and the thinnest single layer thickness is 16um, which is more suitable for use in compact electronic products.

[0017] 2. Good insulation. The coil surface is coated with parylene to form a dense protective film. The pinhole test of the coil surface in salt water is OPCS, and the coil surface has achieved insulation effect. It can also achieve insulation effect when there is water on the coil surface, which is more suitable for outdoor use. In addition, black films that fully cover the coil are provided on both sides of the magnetic sheet. Through full coverage, the coil can be isolated from water and increase the anti-wear performance, further increasing the insulation and protecting the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the coil coating placement structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the perspective structure of the utility model when viewed from above

[0022] 10. Iron-based nanocrystalline magnetic sheet; 20. Coil; 30. Pin; 31. Tinned connection part; 40. Protective film group; 41. First film body; 42. Second film body; 43. Third film body; 44. Avoidance gap; 50. Double-sided adhesive layer; 60. Heat shrink tube; 70. Release film; 80. NTC thermistor; 81. Resistor wiring. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1-Figure 4 As shown, a nanocrystalline magnetic isolation sheet coil receiving module includes an iron-based nanocrystalline magnetic sheet 10, a coil 20, a pin 30 and a protective film group 40;

[0027] The iron-based nanocrystalline magnetic sheet 10 is an iron-based nanocrystalline alloy, the main component of which is iron, and the rest of which is composed of a small amount of copper, niobium, silicon, boron and nickel chemical elements. Compared with the ferrite magnetic sheets currently on the market, the iron-based nanocrystalline magnetic sheet 10 has a higher magnetic permeability and a larger bound magnetic field strength, thereby enhancing the magnetic flux at the receiving end, reducing the loss at the transmitting end, and isolating the transmitting end magnetic field from electronic products and external interference; at the same time, the overall thickness of the iron-based nanocrystalline magnetic sheet 10 is small, and the thinnest single-layer thickness can be 16um, which is more suitable for use in compact electronic products;

[0028] The coil 20 is arranged at one end of the iron-based nanocrystalline magnetic sheet 10; in this embodiment, the surface of the coil 20 is provided with a parylene coating (polyparaxylene coating) to form a dense protective film, and the salt water pinhole test on the surface of the coil 20 is OPCS, and the surface of the coil 20 achieves an insulation effect. Even when there is water on the surface of the coil 20, the insulation effect can be achieved, which is suitable for outdoor electronic products, such as outdoor use of drones; Figure 3 As shown, it is worth noting that during the plating operation, the tinned connection portion 31 at the outermost end of the pin 30 of the coil 20 needs to be shielded to avoid being attached with the plating;

[0029] The pins 30 extend from both ends of the coil 20 toward the outside of the iron-based nanocrystalline magnetic sheet 10; in this embodiment, the pins 30 are sleeved with a heat shrink tube 60 to provide bending protection and improve insulation.

[0030] The protective film group 40 is attached to both ends of the iron-based nanocrystalline magnetic sheet 10 and covers the coil 20 and the pin 30;

[0031] In the present embodiment, the protective film group 40 is a PET black film; the protective film group 40 includes a first film body 41, a second film body 42 and a third film body 43; the first film body 41 is connected to an end face of the iron-based nanocrystalline magnetic sheet 10 facing away from the coil 20; the second film body 42 is connected to an end of the coil 20 away from the iron-based nanocrystalline magnetic sheet 10, and covers the iron-based nanocrystalline magnetic sheet 10, and is provided with an avoidance gap 44 for the pin 30 to extend out; the third film body 43 covers the avoidance gap The opening 44 is covered, and the coil 20 can be isolated from water and the wear resistance can be increased by comprehensive coverage, thereby further increasing the insulation and protecting the coil 20; as for the connection method of the protective film group 40, the protective film group 40 is provided with a backing adhesive, and is attached to the iron-based nanocrystalline magnetic sheet 10 through the backing adhesive; further, in order to increase the comprehensive coverage of the protective film group 40 on one side of the coil 20, a double-sided adhesive layer 50 is attached to one end surface of the iron-based nanocrystalline magnetic sheet 10 adjacent to the coil 20, so as to increase the attachment coverage rate of the second film body 42;

[0032] To this end, the connection method of the coil 20 to the iron-based nanocrystalline magnetic sheet 10 is on the double-sided adhesive layer 50. In this embodiment, a glue connection layer is also provided between the double-sided adhesive layer 50 and the magnetic sheet; the glue connection layer includes structural glue and UV curing glue, which fixes the coil 20 twice to achieve a stable connection.

[0033] Furthermore, a release film 70 is provided on the other end surface of the protective film group 40 opposite to the coil 20 to increase the protection before assembly;

[0034] In order to increase the overall working stability, an NTC thermistor 80 is also included; the NTC thermistor 80 is arranged at the center of the coil 20, and the resistance connection 81 connected to it extends outward from the iron-based nanocrystalline magnetic sheet 10, specifically, it extends parallel to the lead and is covered by the third film body 43; by providing the NTC thermistor 80, temperature measurement, temperature compensation, surge current suppression and overheating protection are realized, thereby realizing charging process data monitoring and increasing the stability of use.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A nanocrystalline magnetic isolation sheet coil receiving module, characterized in that: include: An iron-based nanocrystalline magnetic sheet; a coil is connected to one end of the iron-based nanocrystalline magnetic sheet; the coil is connected to a pin; the pin extends outward from the iron-based nanocrystalline magnetic sheet; and a protective film group is also included, the protective film group is attached to both ends of the iron-based nanocrystalline magnetic sheet and covers the coil and the pin.

2. A nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: The protective film group is a PET black film.

3. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: The protective film group is provided with a backing adhesive and is attached to the iron-based nanocrystalline magnetic sheet through the backing adhesive.

4. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: The protective film group includes a first film body, a second film body and a third film body; the first film body is connected to an end surface of the iron-based nanocrystalline magnetic sheet facing away from the coil; the second film body is connected to an end of the coil away from the iron-based nanocrystalline magnetic sheet, and covers the iron-based nanocrystalline magnetic sheet, and is provided with an avoidance gap for the pin to extend out; the third film body covers the avoidance gap.

5. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: A double-sided adhesive layer is attached to one end surface of the iron-based nanocrystalline magnetic sheet adjacent to the coil.

6. A nanocrystalline magnetic isolation sheet coil receiving module according to claim 5, characterized in that: A glue connection layer is also provided between the double-sided adhesive layer and the magnetic sheet.

7. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: The pin sleeve is provided with a heat shrink tube.

8. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: The coil surface is provided with a parylene coating.

9. The nanocrystalline magnetic isolation sheet coil receiving module according to claim 1, characterized in that: A release film is provided on the other end surface of the protective film group opposite to the coil.

10. A nanocrystalline magnetic isolation sheet coil receiving module according to claim 1 or 4, characterized in that: It also includes an NTC thermistor; the NTC thermistor is arranged at the center of the coil, and the resistance wiring connected to the NTC thermistor extends outward from the iron-based nanocrystalline magnetic sheet.

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