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How does the power inductor of the patch improve the power circuit?
May 15, 2018



How does the power inductor of the patch improve the power circuit?



The DC-DC converter is used in the power circuit of the mobile phone, and the magnetic flux leakage of the power inductor used may induce instability of the power circuit and cause a bad influence on the circuit. These problems can be solved by using stacked type power inductors with less magnetic flux leakage, which can prevent noise interference and stabilize the power supply circuit. In addition, less magnetic flux leakage can also weaken the electromagnetic coupling between the power supply circuit and the surrounding signal lines, and suppress the noise-induced signal purity degradation.

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Magnetic flux leakage monitoring data for power inductors and stacked power inductors. Compared to wound-type power inductors, which have been the main power inductors used on DC-DC converters, stacked-type power inductors have less magnetic flux leakage, and it has been confirmed that the closed-circuit magnetic configuration has less magnetic flux leakage. These data show that in the case of using a small-sized stacked power inductor in a small high-speed switching DC-DC converter circuit, it can exert its anti-noise characteristics.

 

The demand for small and thin portable devices also means that the size of components mounted on them must also be smaller and smaller. The small and thin DC-DC converter in the power circuit can make the switching frequency higher and the surrounding components more compact.

The correlation between power conversion efficiency and power inductor performance of DC-DC converters. PFM refers to the mode in which the mobile phone maintains a low current load in standby mode. At this time, the power conversion efficiency performance is related to the AC resistance (Rac) of the power inductor and the current-sensing value paranoid characteristic. The Rac characteristic switching frequency of each power inductor is a power conversion efficiency characteristic of a 4 MHz DC-DC converter IC. Its Rac feature shows that the small power circuit can fully suppress Rac. At the same time, the current-inductance value paranoid characteristic shows that it can ensure a high inductance value when the current is energized, and has a good power conversion efficiency characteristic. These performances enable the high power conversion efficiency of the handset in standby mode, contributing to extended battery life.


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