The transformer is a device based on the principle of electromagnetic induction to change AC voltage, which generates an alternating magnetic flux in the coil primary winding with alternating voltage, the output voltage induced in the secondary winding, which plays the role of transforming voltage transmission energy, or signal electrical isolation. Transformer is used in electronic circuit and electronic equipment. High frequency electronic transformer is an electronic transformer with higher operating frequency than 20kHz. Why choose 20kHz as the limit? Because 20kHz is the audio limit, more than it can not hear audible noise.

Now the power products, in general, "light, thin, short, small" as the characteristics of the development of miniaturization and portability. Electronic transformers must be adapted to the requirements of the volume and weight of the power products as a user. At the same time, the biggest characteristic of the high frequency electronic transformer is the high frequency. According to the working principle of the transformer, it can reduce the volume and weight of the transformer, realize short and thin and thin, so as to improve the transmission power of unit volume or weight, and high power density. And the price of the raw material and conductive material of the electronic transformer is rising. Therefore, the electronic transformer to reduce the volume and weight of light, in order to reduce the cost and improve the weight of transmission power and better development.

How to go on the road of development, can learn from the following three points:

First, the overall structure optimization

In order to adapt the electronic equipment more and more thin and short, the high frequency electronic transformer can develop from the three-dimensional structure to the plane structure, the chip structure, the thin film structure, and thus form a new generation of high frequency electronic transformer. For example: planar transformer, chip transformer, thin film transformer. In the design, to study various electromagnetic field distribution of new structure, how to achieve the best optimization design problems of multilayer structure; in the production process, to study various new processing methods, so as to ensure the consistency of performance and the realization process of mechanization and automation; structure, design method, can also be to investigate the hollow transformer manufacturing process and application characteristics. Using the computer to optimize the overall structure and specific design, which can shorten the design time, reduce the amount of material, shorten the production cycle, reduce costs.

Two, reduce the cost of magnetic core materials

The magnetic core is the most important part in the high frequency electronic transformer which uses the principle of electromagnetic induction. The main development direction of the magnetic core material is to reduce the loss, widen the temperature range and reduce the cost.

Soft magnetic ferrite is the main magnetic core material used in high frequency electronic transformer, and the development direction is a new technology to develop new varieties with better performance and lower cost. Compared with the traditional soft magnetic ferrite and soft magnetic alloy, the magnetic metal particles or film can be distributed in the non conductor and other materials, so that the high frequency loss is significantly reduced, and the working frequency is increased. Processing can be processed into powder by hot pressing method, can also use plastic engineering technology now, core injection into complex shapes, with small density, light weight, high production efficiency, low cost, product features excellent repeatability and uniformity. Different ratios can be used to change the magnetic properties. It has introduced the soft ferrite and permalloy composite material example, has now developed more than 10kHz operating frequency of soft magnetic composite powder core, can replace the soft ferrite used in high frequency filter inductors.

According to the development requirements of the overall structure of the high frequency electronic transformer, the development direction of the magnetic core structure is the plane magnetic core, the chip type magnetic core and the thin film magnetic core. Planar magnetic core used to be used to transform the original soft magnetic ferrite core, and now has been devoted to the planar transformer of a variety of low height soft ferrite core. In the future, all kinds of low height soft magnetic composite cores can be developed. In addition, the core of the chip type transformer is further compressed to the plane magnetic core, and the chip core made by the co firing method is also adopted.

Three, the development of coil structure

The main development direction of the coil structure is planar coil, coil and coil.