Introduction to wireless charging ferrites

Wireless charging ferrite material system is actually more complex, ferrite mainstream materials are generally divided into two kinds, one is manganese core material, one is nickel core material, are divided into manganese core and nickel core. Manganese core inside a different material system, including nickel core materials, so now may be the mainstream is to buy ferrite magnetic permeability of three thousand three, in fact, there are many kinds of this material.

The wireless charger is divided into a transmitter and a receiver, the transmitter turns the alternating current (AC) into a sympathetic electromagnetic field (EMF), and then the sympathetic EMF generates another sympathetic EMF, which then forms a current charging at the receiver. When the sympathetic electromagnetic field encounters metal, it will generate electronic eddy currents, which will generate heat on the metal, reduce the charging efficiency and interfere with the normal operation of the whole charger. Putting a piece of wireless charging ferrite (thickness 0.1-0.6mm) on the back of the antenna coil at the transmitter and receiver side of the wireless charger can provide a loop for the sympathetic magnetic field through high magnetic flux, blocking the electromagnetic field from the metal and preventing the waste of magnetic energy and magnetic interference.

The application of ferrite materials in wireless charging Currently, the wireless charging market shipments are geometrically exploding growth, and in the near future, many flagship cell phones will be wireless charging as a standard feature, the receiving end of the market will also blowout.

wireless charging ferrite

What is Wireless Charging Ferrite Ferrite

Wireless charging ferrite is a metal oxide with ferromagnetic properties. As far as electrical properties are concerned, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has high dielectric properties.

The magnetic properties of ferrites are also characterized by a high permeability at high frequencies. As a result, ferrite has become a widely used non-metallic magnetic material in the field of high-frequency weak electricity. Due to the lower magnetic energy stored in the unit volume of ferrite, the saturation magnetization strength is also lower (usually only 1/3 ~ 1/5 of pure iron), thus limiting its application in the field of low-frequency strong electricity and high power which requires higher magnetic energy density.

Classification of wireless charging ferrites

Wireless charging ferrite is sintered from iron oxides and other ingredients. They are generally categorized into three types: permanent magnet ferrite, soft magnet ferrite and rotary magnet ferrite.

  • Permanent magnet ferrite, also called ferrite magnet, is the small black magnet we usually see. Its constituent raw materials are mainly iron oxide, barium carbonate or strontium carbonate. After magnetization, the strength of the residual magnetic field is very high, and can maintain the residual magnetic field for a long time. Usually used as permanent magnet material.
  • Soft magnetic ferrites are sintered from iron trioxide and one or more other metal oxides. It is called soft magnetic because when the magnetizing field disappears, the residual magnetic field is small or almost non-existent. They are commonly used as chokes, or as cores in medium frequency transformers.
  • Spin magnetic ferrite is a ferrite material with spin magnetic properties. Spin magnetism of magnetic materials refers to the phenomenon that under the action of two mutually perpendicular DC magnetic fields and magnetic fields of electromagnetic waves, the plane polarized electromagnetic waves will continuously rotate around the direction of propagation during the propagation process in a certain direction inside the material. Spinning ferrite has been widely used in microwave communication field.

Difficulties with wireless charging ferrites

With the wide application of wireless charging, the demand for the use of magnetic materials is growing. And with the processing difficulties of magnetic materials are also exposed in the production and processing manufacturers, about the processing difficulties of magnetic materials, we can fully understand from the material properties of magnetic materials on top of the processing difficulties mainly exist in which several aspects?

  • Ferrite raw material: Ferrite raw material material is characterized by: no toughness, poor adhesion, easy to break, slagging, dust, by the action of force, easy to rupture. Processing requirements for cutting, stripping, stacking, dust removal, the current common method for most of the manual work, it is difficult to form an automated operation.
  • Ferrite magnetic sheet: the material characteristics of ferrite magnetic sheet: the material is highly fragile material, the material is mainly sheet shipping, the material lobes do not break with the direction of the force, in the processing process is difficult to slice, breakage requirements are high, need to be crushed after the second punch cutting. There are phenomena such as difficult to take the sheet, and the magnetic sheet is easy to stack and difficult to separate.
  • Ferrite spacer: a hardness of the magnetic sheet material, the incoming material for the block, need to be laminated and then cut, the material hardness is large, the traditional processing method is easy to hurt the knife, and sheet processing, the traditional processing method is less efficient.
  • Nanocrystalline material: an extremely fragile magnetic carrier material, where fragmentation does not follow the direction of force. It is shipped without an internal support core. Common processing methods are: such carrier tape for double-sided adhesive lamination for crushing operations, requiring crushing without scratching, and the internal fragmentation of the magnetic sheet uniform specifications. Requirements for composite multi-layer after crushing for die-cutting deep processing, and punching does not allow burrs.

Wireless charging ferrite material die-cutting difficulties

This material is basically in the form of sheets, which are thin, heavy and highly friable, and rupture occurs with the slightest force during lifting with the fingers. The rupture does not crack in the direction of the force under regular stress. The processing difficulties in trying to perform a double-layer wrapping like graphite flakes are mainly the following:

  1. Raw materials are difficult to extract and feed;
  2. How to realize batch automation patch operation;
  3. The need for positioning die-cutting, avoiding gaps, black and black rubber to paste, can not be effectively positioned;
  4. Products in the middle of the hole, must be made for the whole section of the punch, difficult to discharge the waste, affecting the life of the tool;
  5. Need to make handles color differentiation, punching and cutting handles.

The advantage of wireless charging ferrite 

  1. Low high-frequency loss: Wireless charging ferrite exhibits low loss of high-frequency signals, enabling efficient transmission of the required high-frequency energy in wireless charging systems. This helps improve wireless charging efficiency and reduce energy losses.
  2. Stable magnetic characteristics: Wireless charging ferrite maintains consistent magnetic properties across different temperatures and operating conditions due to its excellent magnetic stability. This contributes to the stability and reliability of wireless charging systems.
  3. Strong interference resistance: Wireless charging ferrite provides robust interference resistance, minimizing the impact of external electromagnetic interference on wireless charging systems. It effectively shields against external interference signals, ensuring reliable charging performance.
  4. Compact size: Wireless charging ferrite can be designed in small and compact shapes and sizes, making it suitable for integration into various wireless charging devices. It has a high density and permeability, allowing it to provide the required magnetic functionality within limited space.
  5. High customizability: Wireless charging ferrite can be customized to meet the specific requirements of different wireless charging systems and applications. Its composition and structure can be tailored to achieve desired frequency, power, and efficiency characteristics.

In summary, wireless charging ferrite offers advantages such as low high-frequency loss, stable magnetic characteristics, strong interference resistance, compact size, and high customizability. These qualities make it a commonly used magnetic material in wireless charging devices and contribute to the advancement and application of wireless charging technology.

Wireless charging ferrites are on the way

  1. Improving power transmission efficiency: One of the key challenges in wireless charging technology is to enhance power transmission efficiency. One future direction is to improve the characteristics of ferrite materials, such as magnetic permeability and losses, to enhance the transmission efficiency of wireless charging systems.
  2. Size and weight optimization: As wireless charging technology becomes more widespread, there is an increasing demand for smaller, lighter, and thinner wireless charging devices. Therefore, developing higher-performance ferrite materials to achieve more compact designs and lighter wireless charging equipment is an important direction.
  3. Wide bandwidth and multi-standard compatibility: To meet the requirements of different wireless charging standards and frequencies, one future direction is to design ferrite materials with wide bandwidth and multi-standard compatibility. This will provide greater flexibility and interoperability, making wireless charging technology more ubiquitous and convenient.
  4. Thermal management and power density enhancement: As the power of wireless charging devices increases, thermal management becomes an important issue. Future directions will include improving the heat dissipation performance of ferrite materials to increase power density and effectively manage heat.
  5. Sustainability and environmental performance: With the development of wireless charging technology, there is increasing emphasis on sustainability and environmental friendliness. Future directions will include the development of more environmentally friendly ferrite materials, reducing or eliminating negative impacts on the environment.

These development directions aim to enhance the performance, efficiency, and applicability of wireless charging ferrite materials to meet the growing demands of wireless charging applications. It is important to note that specific technologies and innovations will depend on relevant research and industrial advancements.

Wireless charging ferrite material system is actually more complex, ferrite mainstream materials are generally divided into two kinds, one is manganese core material, one is nickel core material, are divided into manganese core and nickel core. Manganese core inside a different material system, including nickel core materials, so now may be the mainstream is to buy ferrite magnetic permeability of three thousand three, in fact, there are many kinds of this material.

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