Molded inductor applied to intelligent cockpit of automobile electronics

Abstract

The utility model relates to the field of patch inductance, concretely relates to the pressure die inductance for the application in the automobile electronic intelligent cockpit, including: coil, electrode sheet has two, two electrode sheets are connected with the one end of coil respectively, shield cover, the integral forming and the part of electrode sheet of all of coil are wrapped, shield cover is pressed by iron powder mixed glue and is baked into the solid structure, the part of electrode sheet is placed in the outside of shield cover and forms the pin portion, the part of electrode sheet is placed in the inside of shield cover and forms the connecting portion connected with coil. Solve the problem of traditional inductance EMI radiation, high temperature performance attenuation and structural reliability deficiency.

Description

Technical Field

[0001] This utility model relates to the field of surface mount inductors, specifically to molded inductors used in automotive electronic smart cockpits. Background Technology

[0002] Automotive electronic intelligent cockpit systems are characterized by multi-module integration (navigation / entertainment / driving assistance systems), operating in high-frequency signal interference environments (multi-band electromagnetic wave coupling), requiring electronic components to operate within a wide temperature range of -40℃ to 150℃. Traditional inductors employ a split shielding structure (ferrite core + metal shell), resulting in incomplete magnetic circuit closure and EMI radiation exceeding the standard by up to 42dBμV / m (14dB beyond the CISPR 25 Class 5 limit), interfering with the vehicle's 5G-V2X communication module. Simultaneously, the permeability of ferrite materials decreases by 30% at high temperatures (at 125℃), and the inductance drifts by ±20%. Under vibration conditions (20G random vibration), the risk of pin solder joint breakage reaches 5%, and cracking of the potting material reduces the protection level to IP54. These defects restrict the miniaturization (traditional inductor height ≥5mm) and integration of intelligent cockpit modules (requiring an additional EMI shielding cover, increasing volume by 40%). Utility Model Content

[0003] To address the aforementioned issues, a surface-mount inductor for automotive electronic wireless charging modules is provided, resolving the problems of excessive EMI radiation, high-temperature performance degradation, and insufficient structural reliability of traditional inductors.

[0004] To address the problems of existing technologies, this utility model provides a molded inductor for use in automotive electronic intelligent cockpits, comprising: a coil; two electrode plates, each connected to one end of the coil; and a shielding cover integrally formed and enclosing the entire coil and a portion of the electrode plates. The shielding cover is formed into a solid structure by pressing and baking iron powder mixed with glue. The portion of the electrode plate placed outside the shielding cover forms a lead portion, and the portion of the electrode plate placed inside the shielding cover forms a connection portion connected to the coil.

[0005] Preferably, the pin portion has an L-shaped structure, with the vertical portion of the L-shaped structure in close contact with the side wall of the shielding cover and the horizontal portion of the L-shaped structure in close contact with the bottom of the shielding cover.

[0006] Preferably, the bottom of the shield is provided with a groove that mates with the horizontal portion.

[0007] Preferably, the connecting portion has a first connecting portion parallel to the horizontal portion, which is welded to the end of the coil.

[0008] Preferably, the connecting portion has a second connecting portion parallel to the horizontal portion, and a gap is formed between the second connecting portion and the first connecting portion.

[0009] Preferably, the shield is a cubic structure with a square cross-section in the height direction, and the height of the cube is between 1 / 3 and 1 / 2 of the side length of the base.

[0010] Preferably, the nominal inductance of the molded inductor is 10μH, with an allowable deviation range of ±20%.

[0011] Preferably, the operating temperature range of the molded inductor is -55°C to 125°C.

[0012] Preferably, the maximum DC resistance is 32mΩ.

[0013] Compared with the prior art, the advantages of this utility model are: the EMI radiation is reduced by the one-piece molded iron powder shielding cover, and the L-shaped electrode plate design makes the lead part and the connection part a single structure, which increases the welding area and improves the shear strength. Attached Figure Description

[0014] Figure 1 This is a perspective view of the molded inductor of this utility model applied to the intelligent cockpit of an automotive electronics system.

[0015] Figure 2 This invention relates to a three-dimensional decomposition of a molded inductor applied to an automotive electronic intelligent cockpit. Figure 1 .

[0016] Figure 3 This invention relates to a three-dimensional decomposition of a molded inductor applied to an automotive electronic intelligent cockpit. Figure 2 .

[0017] Figure 4 This is a planar sectional view of the molded inductor of this utility model applied to the intelligent cockpit of an automotive electronics system.

[0018] Figure 5 This is a three-dimensional partial cross-sectional view of the molded inductor of this utility model applied to the intelligent cockpit of an automotive electronics system.

[0019] The numbers in the diagram are: 1. Coil; 2. Electrode plate; 21. Vertical part; 22. Horizontal part; 23. First connecting part; 24. Second connecting part; 3. Shielding cover; 31. Groove. Detailed Implementation

[0020] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0021] See Figures 1-5The diagram shows a die-cast inductor for use in automotive electronic intelligent cockpits, comprising: a coil 1; two electrode plates 2, each connected to one end of the coil 1; and a shield 3, integrally formed and enclosing the entire coil 1 and a portion of the electrode plates 2. The shield 3 is formed into a solid structure by pressing and baking iron powder mixed with glue. The die-casting process reduces assembly steps, increasing the mass production yield from 95% to 99.9%, while also improving the inductor's high-temperature resistance and reducing high-temperature decay. The portion of the electrode plate 2 placed outside the shield 3 forms a lead portion, and the portion of the electrode plate 2 placed inside the shield 3 forms a connection portion for connection with the coil 1.

[0022] The pin portion has an L-shaped structure, with the vertical portion 21 of the L-shaped structure closely attached to the side wall of the shielding cover 3, and the horizontal portion 22 of the L-shaped structure closely attached to the bottom of the shielding cover 3. The horizontal portion 22 increases the soldering area of ​​the pin, improving both soldering strength and shear strength, resulting in enhanced structural strength.

[0023] The bottom of the shield 3 is provided with a groove 31 that mates with the horizontal part 22. The design of the groove 31 allows part of the horizontal part 22 to be hidden in the groove 31 in the thickness direction, thereby reducing the overall height of the inductor.

[0024] The connecting part has a first connecting part 23 parallel to the horizontal part 22, which is welded to the end of the coil 1.

[0025] The connecting portion has a second connecting portion 24 parallel to the horizontal portion 22, forming a gap between the second connecting portion 24 and the first connecting portion 23. Since the shielding cover 2 is formed by pressing and baking iron powder mixed with glue, the pressed and baked material encapsulates the first connecting portion 23 and the second connecting portion 24, filling the gap between them. This makes the connection between the connecting portion and the shielding cover 2 tighter and more stable, further improving the reliability of the connection between the first connecting portion 23 and the coil 1.

[0026] The shield 3 is a cubic structure with a square cross-section in the height direction, and the height of the cube is between 1 / 3 and 1 / 2 of the side length of the base. This makes the inductor appear flat overall.

[0027] The dimensional parameters of the molded inductor of this invention are as follows: The bottom side length of shielding cover 3 is 11.0 ± 0.5 mm.

[0028] The height of shielding cover 3 is 3.8 ± 0.2 mm.

[0029] The width of the horizontal portion 22 of electrode 2 is 2.3 ± 0.3 mm.

[0030] The length of the horizontal portion 22 of electrode 2 is 3.0 ± 0.5 mm.

[0031] The electrical performance parameters of the molded inductor of this invention are as follows: Inductance L: The nominal inductance is 10μH, with an allowable deviation range of ±20%, and a reference value of 10.15μH.

[0032] Load inductance L: The maximum limit is a 30% decrease in inductance at a current of 6.0A. The reference value is 8.15μH.

[0033] DC resistance (DCR): The maximum DC resistance is 32mΩ, and the reference value is 29.00mΩ.

[0034] Saturation current Isat MAX: When the peak saturation current is 6.0A, the inductance value L will drop by no more than 30%.

[0035] Saturation current IsatTYP: When the peak saturation current is 8.0A, the inductance value L will decrease by approximately 30%.

[0036] Temperature rise current I rms MAX: When the effective value of the temperature rise current is 6.0A, it will cause the product temperature ΔT to rise by a maximum of 40°C. Temperature rise current I rms TYP: When the effective value of the temperature rise current is 7.0A, it will cause the product temperature ΔT to rise by approximately 40°C.

[0037] Operating temperature: The operating temperature range is -55℃ to 125℃. Under operating conditions, the product temperature should not exceed 125℃ above the ambient temperature.

[0038] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A die-molded inductor used in automotive electronic intelligent cockpits, characterized in that, include: Coil (1); There are two electrode plates (2), and the two electrode plates (2) are respectively connected to one end of the coil (1); The shield (3) is integrally formed and encloses the entire coil (1) and a portion of the electrode sheet (2); The shielding cover (3) is made of iron powder mixed with glue, pressed and baked into a solid structure; The portion of the electrode plate (2) placed outside the shield (3) forms a pin portion, and the portion of the electrode plate (2) placed inside the shield (3) forms a connection portion that connects to the coil (1).

2. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 1, characterized in that, The pin portion has an L-shaped structure, with the vertical portion (21) of the L-shaped structure closely attached to the side wall of the shield (3), and the horizontal portion (22) of the L-shaped structure closely attached to the bottom of the shield (3).

3. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 2, characterized in that, The bottom of the shield (3) is provided with a groove (31) that cooperates with the horizontal part (22).

4. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 3, characterized in that, The connecting part has a first connecting part (23) parallel to the horizontal part (22), which is welded to the end of the coil (1).

5. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 4, characterized in that, The connecting portion has a second connecting portion (24) parallel to the horizontal portion (22), and a gap is formed between the second connecting portion (24) and the first connecting portion (23).

6. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 1, characterized in that, The shield (3) is a cubic structure with a square cross-section in the height direction, and the height of the cube is between 1 / 3 and 1 / 2 of the side length of the base.

7. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 1, characterized in that, The nominal inductance of this molded inductor is 10μH, with a tolerance range of ±20%.

8. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 1, characterized in that, The operating temperature range of this molded inductor is -55°C to 125°C.

9. The die-molded inductor for use in automotive electronic intelligent cockpits according to claim 1, characterized in that, The maximum DC resistance is 32mΩ.

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