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As the switching frequency increases, core losses and winding AC losses can greatly reduce the allowable DC current of the inductor. Have you ever experienced a full-power test for charging a buck regulator, and then leaving a permanent (scald) mark on the inductive fingertip temperature test? Perhaps too high core loss and AC winding losses are the culprit. At 100-kHz switching frequency, there is generally no problem because the core loss is about 5% to 10% of the total inductance loss. Therefore, the corresponding temperature rise is the problem. In general, when selecting an inductor, it is only necessary to calculate the maximum load current and establish the inductance by allowing 20% ​​ripple current. Since the core loss is negligible, a temperature rise similar to that shown in the product manual appears. However, as the switching frequency rises above 500 kHz, core losses and winding AC losses can greatly reduce the allowable DC current in the inductor. Using 20% ​​ripple current to calculate the inductance results in the same core material flux surge, independent of frequency.
A lithium polymer battery, or more correctly lithium-ion polymer battery (abbreviated as LiPo, LIP, Li-poly, lithium-poly and others), is a rechargeable battery of lithium-ion technology using a polymer electrolyte instead of a liquid electrolyte. High conductivity semisolid (gel) polymers form this electrolyte.High power. Both lithium-ion and lithium-poly batteries are suitable with high and robust power usages. However, lithium-ion batteries are more efficient and popular than lithium-polymer.Many manufacturers have stated that their LiPo batteries will last 2 or 3 years. This is a somewhat realistic approximation for a scenario where a battery is regularly used and charged around 2 or 3 times a week.Lithium polymer batteries could potentially be dangerous. ... However, if care is taken to store the batteries properly, Lithium batteries shouldn't be very dangerous at all. Additionally, Lithium polymer batteries should be even safer than traditional Lithium batteries.Lithium Polymer batteries are perhaps the most hazardous parts we deal with on a day to day basis when it comes to our miniquads. This is both because of their propensity to explode into a small fireball when mistreated and because of the massive amount of power they are capable of dumping out of their terminals.
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