Search

CN-122000183-A - Wireless charging coil module with magnetic core without surrounding edge

CN122000183ACN 122000183 ACN122000183 ACN 122000183ACN-122000183-A

Abstract

The application relates to the technical field of wireless charging and discloses a wireless charging coil module with a magnetic core and no surrounding edge, which comprises a bracket and an electromagnetic coil, wherein the electromagnetic coil is coaxially assembled on the bracket, a planar manganese-zinc ferrite magnetic core with no surrounding annular limiting surrounding edge for fixing the electromagnetic coil is assembled between the electromagnetic coil and the bracket, a cylindrical limiting boss for limiting the displacement of the electromagnetic coil is fixedly arranged on the top end surface of the magnetic core, and the electromagnetic coil is coiled and formed by a plurality of enamelled wires.

Inventors

  • YANG LIJIANG
  • YANG CHENGMENG
  • SHEN ZHIHAI
  • SHI ZHE

Assignees

  • 浙江海英俊电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (10)

  1. 1. The wireless charging coil module without the surrounding edge of the magnetic core (4) comprises a support (1) and an electromagnetic coil (2) for generating a changing magnetic field to charge equipment, wherein the electromagnetic coil (2) is coaxially assembled on the support (1), and the wireless charging coil module is characterized in that the magnetic core (4) without the surrounding annular limiting surrounding edge of the electromagnetic coil (2) is assembled between the electromagnetic coil (2) and the support (1), a cylinder limiting boss (41) for limiting the displacement of the electromagnetic coil (2) is fixedly arranged on the top end face of the magnetic core (4), and the electromagnetic coil (2) is coiled and formed by a plurality of enameled wires.
  2. 2. The wireless charging coil module without surrounding edges of a magnetic core (4) according to claim 1, wherein the number of coiled strands of the electromagnetic coil (2) assembled on the magnetic core (4) without surrounding annular limiting surrounding edges is larger than the number of coiled strands of the electromagnetic coil (2) assembled on the magnetic core (4) with surrounding annular limiting surrounding edges with the same specification under the same rated charging power condition, and the increased number of coiled strands of the electromagnetic coil (2) compensates the performance loss of the magnetic core (4) without surrounding edges.
  3. 3. The wireless charging coil module without surrounding edges for the magnetic core (4) according to claim 1, wherein the magnetic core (4) is coaxially assembled with the electromagnetic coil (2), the limiting boss (41) is coaxially fixed with the magnetic core (4), and the outer diameter of the limiting boss (41) is matched with the inner diameter of the electromagnetic coil (2).
  4. 4. A wireless charging coil module without a surrounding edge of a magnetic core (4) according to claim 3, wherein the diameter of the magnetic core (4) is larger than the diameter of the electromagnetic coil (2).
  5. 5. The wireless charging coil module without surrounding edges of the magnetic core (4) according to claim 1, wherein an integrated structure is adopted between the limiting boss (41) and the magnetic core (4).
  6. 6. The wireless charging coil module without surrounding edges of the magnetic core (4) according to claim 1, wherein a split type independent component is adopted between the limiting boss (41) and the magnetic core (4), and the bottom of the limiting boss (41) is fixedly connected with the top end surface of the magnetic core (4) through a solidified bonding layer.
  7. 7. The wireless charging coil module without surrounding edges of the magnetic core (4) according to claim 1, wherein an aluminum base (3) with the diameter larger than that of the magnetic core (4) is fixedly assembled between the magnetic core (4) and the support (1), a wire groove (5) is further processed on the magnetic core (4) and the aluminum base (3), a connecting wire (21) connected with the electromagnetic coil (2) is contained in the wire groove (5), a wire harness groove (12) matched with the wire groove (5) is further processed on the support (1), and the connecting wire (21) penetrates through the wire harness groove (12) to be connected with an external control circuit.
  8. 8. A wireless charging coil module without surrounding edges of a magnetic core (4) according to claim 3, wherein the top end surface of the limiting boss (41) is higher than the top end surface of the electromagnetic coil (2).
  9. 9. The wireless charging coil module without surrounding edges of the magnetic core (4) according to claim 7, wherein the annular magnet array (31) is fixedly arranged on the aluminum base (3), and the inner diameter of the magnet array (31) is larger than the outer diameter of the magnetic core (4).
  10. 10. The wireless charging coil module without surrounding edges of a magnetic core (4) according to claim 7, wherein a shielding coil (6) with the diameter larger than that of the electromagnetic coil (2) is coaxially and fixedly arranged on the magnetic core (4), current flowing into the shielding coil (6) is opposite to that of the electromagnetic coil (2), shielding wires (61) are connected to two ends of the shielding coil (6), and the shielding wires (61) penetrate through a wire harness slot (12) to be connected with an external control circuit.

Description

Wireless charging coil module with magnetic core without surrounding edge Technical Field The invention relates to the technical field of wireless charging, in particular to a wireless charging coil module with a magnetic core and no surrounding edge. Background Along with the rapid development of wireless charging technology, the magnetic type wireless charging has been widely applied to various fields such as smart phones, wearable equipment, vehicle-mounted electronics, smart home and the like by virtue of the advantages of accurate positioning, high coupling efficiency and convenient use. The wireless charging coil module is a core component for realizing energy conversion and transmission of magnetic charging equipment, and mainly comprises a bracket, an electromagnetic coil, a ferrite core, a magnetic attraction structure, a temperature control assembly and a shielding structure, wherein the ferrite core has the core function of providing a low-reluctance conduction path for an alternating magnetic field generated by the electromagnetic coil, restraining magnetic leakage, improving electromagnetic coupling efficiency, isolating electromagnetic interference and determining charging performance and product reliability. In the current wireless charging coil module design is inhaled to magnetism, in order to guarantee the coaxial installation accuracy of solenoid and ferrite core, the skew appears when avoiding the coil to assemble and leads to coupling efficiency decline, the problem of aggravation generates heat, the technical scheme who generally adopts in the trade is at the annular spacing surrounding edge of ferrite core's upper surface an organic whole processing border closed loop, form the annular spacing groove that matches with solenoid external diameter through spacing surrounding edge, with the direct card of solenoid in spacing inslot, can realize the spacing and coaxial positioning of the border of coil. However, in the actual production and application process, the ferrite core structure with the peripheral edge has extremely low mass production efficiency due to high processing cost, and the ferrite core with the peripheral edge is of a special-shaped structure and cannot be formed at one time through a stamping process, so that CNC cutting processing is required to be completed, the processing procedures are more, the production period is long, the material loss is large, the problems of high single-piece processing cost and large equipment investment exist, and the large-scale and low-cost mass production requirement in the consumer electronics field cannot be met. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the wireless charging coil module without the surrounding edge of the magnetic core, which has the advantages of being capable of being formed by stamping at one time, low in cost, high in mass production efficiency and small in material loss, and solves the problems that the existing ferrite magnetic core is of a special-shaped structure, CNC cutting is needed, and the cost is high, the mass production efficiency is low and the material loss is large. The wireless charging coil module comprises a bracket and an electromagnetic coil for generating a changing magnetic field to charge equipment, wherein the electromagnetic coil is coaxially assembled on the bracket, a planar manganese-zinc ferrite magnetic core for fixing the annular limiting surrounding edge of the electromagnetic coil without the surrounding ring is assembled between the electromagnetic coil and the bracket, a cylinder limiting boss for limiting the displacement of the electromagnetic coil is fixedly arranged on the top end surface of the magnetic core, the electromagnetic coil is coiled and formed by a plurality of enameled wires, and the outer diameter of the limiting boss is matched with the inner diameter of the electromagnetic coil. Preferably, under the same rated charging power condition, the coiling number of the electromagnetic coil assembled on the planar magnetic core without the circumferential annular limiting surrounding edge is larger than that of the electromagnetic coil assembled on the magnetic core with the same specification with the circumferential annular limiting surrounding edge, and the increased coiling number of the electromagnetic coil compensates the performance loss of the magnetic core without the surrounding edge structure. Preferably, the magnetic core is coaxially assembled with the electromagnetic coil, and the limiting boss is coaxially fixed with the magnetic core. Preferably, the diameter of the magnetic core is larger than the diameter of the electromagnetic coil. Preferably, an integrated structure is adopted between the limiting boss and the magnetic core. Preferably, a split type independent component is adopted between the limiting boss and the magnetic core, and the bottom of the limiting boss is fixedly connected with the top end