Wireless power transfer is becoming increasingly popular in modern devices, especially where traditional charging connectors are impractical or ineffective. For example, some products require sealed enclosures to protect sensitive electronics from environmental factors, making it easier to clean or disinfect. Others are too compact to accommodate physical connectors, and when battery-powered systems include moving or rotating parts, wired charging becomes unnecessary. In such cases, wireless charging offers greater reliability and robustness.
There are several methods for transferring power wirelessly, with capacitive and inductive coupling being the most common for short-range applications—typically under a few inches. This article focuses on inductive coupling as a solution for wireless power transfer.
In a typical inductive wireless power system, an alternating current (AC) magnetic field is generated by a transmitting coil, which induces an AC current in the receiving coil, similar to how a transformer works. The key difference lies in the fact that the transmitter and receiver are separated by an air gap or non-magnetic material, resulting in a weaker magnetic coupling. Transformer systems usually have a coupling factor between 0.95 and 1, while wireless power systems typically operate with a coupling factor ranging from 0.8 down to as low as 0.05.
The basic principle of wireless charging involves two main components: a transmit (Tx) circuit containing a transmit coil and a receive (Rx) circuit containing a receive coil, separated by an air gap. When designing a wireless charging system, the primary concern is ensuring that sufficient power reaches the battery, which depends on factors like the transmitted power, alignment between coils, and component tolerances.
A major design challenge is ensuring that the transmitter can deliver enough power even under worst-case conditions without overheating the receiver or causing electrical stress. This is particularly important when the system operates at high coupling levels, such as when a fully charged battery is placed close to the transmitter coil.
The LTC4125 is a versatile IC designed to simplify the implementation of wireless power transmitters. It works with various battery charger ICs, such as the LTC4120, and provides features like output power regulation and foreign object detection. One of its key technologies is AutoResonant, which ensures the transmitter operates efficiently at the resonant frequency of the LC network, even with changing conditions like temperature or load variations.
By continuously adjusting the drive frequency and pulse width, the LTC4125 optimizes power delivery to the receiver, even when there is misalignment between the coils. This allows for reliable performance over distances up to 12 mm, with power levels reaching up to 2 W.
Another critical feature of the LTC4125 is its ability to detect conductive foreign objects in the magnetic field. If a metal object is present, it can cause unwanted heating due to eddy currents. The LTC4125 detects this by monitoring changes in the resonant frequency and automatically stops transmission if necessary.
The flexibility of the LTC4125 allows it to be adapted for different receiver ICs and power levels simply by adjusting external components like resistors and capacitors. This makes it suitable for a wide range of applications, from low-power to high-power charging systems.
With a compact design and high efficiency, the LTC4125 is ideal for developers looking to create reliable, efficient, and secure wireless charging solutions. Its advanced features make it a powerful choice for any wireless power transmitter design.
Filter Mesh
Filter mesh refers to small aperture metal mesh or other materials with smaller apertures for a variety of different filtration, dust removal and separation requirements. They are widely used in shower panel, sanitary pipe systems, purifiers, electronic components, to remove contaminants or in applications, such as coffee machine, soya milk machine, to extract a filter cake. Because the metal mesh filters are one of the most durable filter media available, the material is mainly made of copper, iron, steel, nickel, stainless steel, alloy. It is acid resistant, alkali resistant, temperature resistant and wear resistant.
We customize diverse patterns metal microporous mesh with drawings provided by customers. We are equipped with professional metal etching equipment and exposure development equipment. Chemical metal etching filter mesh is a double-sided and simultaneous processing technology, which can make the product surface (positive and negative) smooth, without bumps, pits, burrs, warps, and flat mesh without deformation. Below are the advantages for customized metal filter mesh:
Flow Rate
One of the most significant advantages metal mesh has over most filter media used today is its ability to deliver an adequate flow rate. This is achievable as the wire diameter and mesh opening can be customized to perfectly match the contaminants you are filtering out, providing you with an enhanced level of filtration surface area.
Durability
300 series stainless steel is predominantly used. This helps create a filter that can withstand a wide range of impurities, pressure variations, and extreme temperatures without hindering the filter's accuracy. In addition, stainless steel is a very pliable material, allowing the filter to be formed to fit your filter system and hold its shape after several uses.
Accuracy
The weaving process used to construct mesh filters is heavily monitored from start to finish. As a result, the pore openings of the filter are exact and uniform throughout the filter. These precise pore opinings ensure that the end product, whether a filtered substance or a filter cake, is consistent and complies with industry standards.
Clean ability
As metal mesh features accurate pore openings, blinding and plugging are significantly reduced. This, combined with the enhanced flow rate, means system operators can clean the metal mesh easily. These two properties allow the mesh filter to be backflushed and purged of any unwanted debris with minimal pressure.
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