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What are the insufficient inductance of power patch

Date：2021-08-23 Viewed：2240

Power chip inductors are also called power inductors, high current inductors and surface-mounted high power inductors. It has the characteristics of miniaturization, high quality, high energy storage and low resistance. So although most people know these characteristics, what are the shortcomings? Ha ~ I don't know much about it, so let's learn about it with Xiaobian as follows.
简述功率贴片电感不足有哪些

Insufficient inductance of power patch
First, the bad phenomenon of raw materials
When selecting raw materials, the power patch inductor; It will be found during the feed inspection; Magnetic core; Magnetic ring fracture; Damaged; Dark crack; It is not difficult to understand the fracture and damage of magnetic core and magnetic ring; Visual inspection can be detected; Dark cracks are usually not easy to find; It must be clearly visible under the light of 40W under a magnifying glass. Beginners usually ignore dark cracks; If dark cracked products are put into the production line; After assembling the finished product; After packaging, bake at 120℃; In the test process of inductance tester, it will be found that the inductance deviation of this product is large; Even cracking; This leads to serious poor appearance and poor performance, such as putting an end to bad materials during incoming inspection; Productivity will remain at a good level.

Second, the defects in the assembly process
The general packaging process of power chip inductors is relatively simple. Generally speaking, it is assembled by hand. Operate under the auxiliary conditions of tools and fixtures; Although the efficiency is higher than that of pure manual assembly, the defective rate is also relatively high. The number of turns and reserved length of hanging wire in the winding process; This determines the difficulty and badness of the next process; If the number of winding coils is insufficient; Or the reserved length of the hanging line is insufficient; Make solder more difficult; If the spot welding speed is fast; False welding will be formed; Bad phenomena such as virtual welding; If the magnetic core and the magnetic cover are improperly assembled, the assembly deviation will be caused; In addition to affecting the appearance of the inductor, it may also lead to poor inductance; ; Because the assembly is not in place; The magnetic cover of the magnetic core is not sealed firmly; Resulting in magnetic leakage; Magnetic saturation performance decreases; Indirectly make inductance parameters unstable; Excessive deviation range of inductance leads to defects.

Third, the finished product test data is bad
The qualified rate of finished products of power chip inductors before delivery is particularly important. If we ignore the inspection of test instruments; Equipment and instruments; Test conditions with abnormal stability; Testers ignored the inspection of test parameters; If the product batch is not good, the test parameters can be reached at this time; The test range can be achieved; But the range of actual conditions should be very small. At this time, the tested products will have great risks; Therefore, the data of power chip inductor before delivery must be accurate.

What are the insufficient inductance of power patch

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