Power inductor for notebook computer

Abstract

The utility model relates to power inductance field, concretely relates to a kind of power inductance applied to notebook computer, comprising: coil winding, the coil winding has two end electrodes, coil winding is coiled into the upper layer winding and lower layer winding of stacking, the end of upper layer winding constitutes one the end electrode, the end of lower layer winding constitutes another the end electrode;Shielding cover, iron powder is pressed and high-temperature sintering into shape and is covered outside coil winding;Coil winding is wound into shape by flat copper band, and each end electrode has the contact surface of the length direction end surface of shielding cover flush;The end of the length direction of shielding cover is coated with metal plating, and the contact surface of the end electrode is electrically connected with the metal plating.

Description

Technical Field

[0001] This utility model relates to the field of power inductors, specifically to a power inductor used in laptops. Background Technology

[0002] As laptops become thinner, lighter, and more high-performance, power inductors, as core components of power management systems, face multiple challenges related to electromagnetic interference (EMI), heat dissipation efficiency, and space utilization. Current mainstream solutions suffer from significant technical bottlenecks: traditional open-type inductors generate strong radiated interference in the 50-200MHz frequency band, causing EMI to exceed standards by 15dB, requiring additional filter components and increasing PCB area by 20%; in high-power scenarios, the inductance of traditional ferrite inductors drops by over 30% at 4.5A current, and the core and coil thermal resistance reaches as high as 0.5℃ / W, resulting in an annual failure rate of 2.3% for some brands of adapters; discrete inductors account for over 30% of the power module volume and are typically ≥6mm thick, making it difficult to meet the design requirements of ultra-thin laptops for adapter thickness ≤8mm. While TDK's 0.8×0.45×0.65mm thin-film inductor achieves miniaturization, its 0.72A saturation current cannot meet the demands of high-performance CPUs.

[0003] Existing technologies have significant limitations: while magnetic shielding can suppress EMI, nickel-zinc ferrite shields increase high-frequency core losses by 30%; amorphous alloy cores reduce losses by 20%, but their cost is three times that of traditional ferrites; molded inductors achieve miniaturization through metal powder pressing, but the purity of domestically produced magnetic powder (98%) is lower than that of Japanese products (99.5%), limiting the improvement of saturation current. Therefore, developing power inductors that combine low EMI, high heat dissipation efficiency, and an ultra-thin structure is crucial for upgrading laptop power modules. Utility Model Content

[0004] To address the aforementioned issues, a power inductor for laptops is provided, which achieves synergistic optimization of electromagnetic shielding and heat dissipation paths through direct electrical connection between the terminal electrodes and the metal plating of the shielding cover.

[0005] To address the problems of existing technologies, this utility model provides a power inductor for use in laptops, comprising: A coil winding having two end electrodes, the coil winding being coiled into an upper winding and a lower winding stacked together, the end of the upper winding forming one end electrode and the end of the lower winding forming the other end electrode; The shielding cover is made of iron powder pressed and sintered at high temperature and then wrapped around the outside of the coil winding. The coil winding is formed by winding flat copper strip, and each end electrode has a contact surface that is flush with the end face of the shield along its length; the end of the shield along its length is covered with a metal plating layer, which is electrically connected to the contact surface of the end electrode.

[0006] Preferably, the nominal inductance of the power inductor is 1.00 μH, with an allowable deviation range of ±20%.

[0007] Preferably, the maximum limit for the load inductance of the power inductor is a 30% decrease in inductance at a current of 4.5A.

[0008] Preferably, the maximum DC resistance of the power inductor is 42mΩ.

[0009] Preferably, when the saturation current of the power inductor is 5.5A, the inductance value L will decrease by 30%; when the saturation current of the power inductor is 4.5A, the inductance value L will decrease by no more than 30%.

[0010] Preferably, when the temperature rise current of the power inductor is 4.2A, the product temperature will rise to 40°C; when the temperature rise current of the power inductor is 3.6A, the product temperature will rise to no more than 40°C.

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

[0012] The advantages of this invention compared to existing technologies are as follows: This invention achieves synergistic optimization of electromagnetic shielding and heat dissipation paths through the integrated design of layered windings and an iron powder sintered shield. The coil windings are formed by winding flat copper strips, combined with an upper and lower layered stacking structure, effectively improving space utilization while reducing high-frequency losses. The shield is formed by pressing iron powder and sintering it at high temperature, tightly covering the outside of the coil windings, significantly reducing electromagnetic interference and solving the leakage magnetic problem of traditional open-type inductors.

[0013] The direct electrical connection between the terminal electrodes and the metal coating of the shield not only simplifies the structure but also enhances heat dissipation, enabling rapid heat dissipation and preventing performance degradation caused by inductor overheating. The overall design balances low electromagnetic interference, high heat dissipation efficiency, and an ultra-thin structure, meeting the demands of laptops for thinner, lighter, and higher-performance devices, and providing an effective solution for power module upgrades. Attached Figure Description

[0014] Figure 1 This is a perspective view of a power inductor for use in a laptop computer according to this utility model.

[0015] Figure 2This is a three-dimensional view of a power inductor of this utility model applied to a laptop computer with the shielding cover transparently displayed.

[0016] Figure 3 This is a three-dimensional cross-sectional view of a power inductor used in a laptop computer, according to this utility model.

[0017] The numbers in the diagram are: 1. Coil winding; 2. Terminal electrode; 3. Shielding cover; 4. Contact surface; 5. Metal plating. Detailed Implementation

[0018] 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.

[0019] A power inductor for use in laptops, comprising: A coil winding 1 has two end electrodes 2. The coil winding 1 is coiled into an upper winding and a lower winding stacked together. The end of the upper winding forms one of the end electrodes 2, and the end of the lower winding forms the other end electrode 2. The shielding cover 3 is made of iron powder pressed and sintered at high temperature and is wrapped around the outside of the coil winding 1. The coil winding 1 is formed by winding flat copper strip, and each end electrode 2 has a contact surface 4 that is flush with the end face of the shield 3 along its length; the end of the shield 3 along its length is covered with a metal plating layer 5, which is electrically connected to the contact surface 4 of the end electrode 2.

[0020] Preferably, the nominal inductance of the power inductor is 1.00 μH, with an allowable deviation range of ±20%.

[0021] Preferably, the maximum limit for the load inductance of the power inductor is a 30% decrease in inductance at a current of 4.5A, with a reference value of 0.77μH.

[0022] Preferably, the maximum DC resistance of the power inductor is 42mΩ.

[0023] Preferably, when the saturation current of the power inductor is 5.5A, the inductance value L will decrease by 30%; when the saturation current of the power inductor is 4.5A, the inductance value L will decrease by no more than 30%.

[0024] Preferably, when the temperature rise current of the power inductor is 4.2A, the product temperature will rise to 40°C; when the temperature rise current of the power inductor is 3.6A, the product temperature will rise to no more than 40°C.

[0025] Preferably, the operating temperature range of the power inductor is -55°C to 125°C.

[0026] The performance parameters of the power inductor of this invention are as follows: Inductance L: The nominal inductance is 1.00μH, with an allowable deviation range of ±20%, and a reference value of 1.03μH.

[0027] Load inductance L: The maximum limit is that the inductance drops by 30% at a current of 4.5A. The reference value is 0.77μH.

[0028] DC resistance (DCR): The maximum DC resistance is 42mΩ, and the reference value is 34.00mΩ.

[0029] Saturation current IsatTYP: When the peak saturation current is 5.5A, the inductance value L will decrease by approximately 30%.

[0030] Saturation current Isat MAX: When the peak saturation current is 4.5A, the inductance value L will drop by no more than 30%.

[0031] Temperature rise current I rms TYP: When the effective value of the temperature rise current is 4.2A, it will cause the product temperature ΔT to rise by approximately 40°C.

[0032] Temperature rise current I rms MAX: When the effective value of the temperature rise current is 3.6A, it will cause the product temperature ΔT to rise by a maximum of 40°C.

[0033] Operating temperature: The operating temperature range is -55℃ to 125℃. Under operating conditions, the product temperature should not exceed 125℃ above the ambient temperature.

[0034] 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 power inductor for use in laptops, characterized in that, include: A coil winding (1) has two end electrodes (2). The coil winding (1) is coiled into an upper winding and a lower winding stacked together. The end of the upper winding forms one of the end electrodes (2), and the end of the lower winding forms the other end electrode (2). The shield (3) is formed by pressing iron powder and sintering it at high temperature and covering the outside of the coil winding (1); The coil winding (1) is formed by winding flat copper strip, and each end electrode (2) has a contact surface (4) that is flush with the end face of the shield (3) in the length direction; the end of the shield (3) in the length direction is covered with a metal plating layer (5), which is electrically connected to the contact surface (4) of the end electrode (2).

2. The power inductor for a laptop computer according to claim 1, characterized in that, The nominal inductance of this power inductor is 1.00μH, with a tolerance range of ±20%.

3. The power inductor for a laptop computer according to claim 1, characterized in that, The maximum limit for this power inductor is a 30% decrease in inductance under a load current of 4.5A.

4. The power inductor for a laptop computer according to claim 1, characterized in that, The maximum DC resistance of this power inductor is 42mΩ.

5. The power inductor for a laptop computer according to claim 1, characterized in that, When the saturation current of the power inductor is 5.5A, the inductance value L will decrease by 30%; when the saturation current of the power inductor is 4.5A, the inductance value L will decrease by no more than 30%.

6. The power inductor for a laptop computer according to claim 1, characterized in that, When the temperature rise current of this power inductor is 4.2A, the product temperature will rise to 40°C; when the temperature rise current of this power inductor is 3.6A, the product temperature will rise to no more than 40°C.

7. The power inductor for a laptop computer according to claim 1, characterized in that, The operating temperature range of this power inductor is -55°C to 125°C.

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