Pressure transmitters and electronic transformers need to be innovative

In the electronic transformer industry in the middle position, only by taking the road of technological innovation can we break free from the dilemma of being gassed at both ends. The electronic transformer in the power supply, like all products as a commodity, must complete the detailed function under the premise of detailed use, and pursue the best function-to-price ratio in any technological innovation.

Over the years, the price of oriented and non-oriented cold-rolled silicon steel has risen, and the coiled annular core, compared with the R-type, CD-type and EI-type core, can save more than 20% of the cost of core materials because of the less material consumption, and expand the scope of use in electronic transformers. The coiled annular core can fully exert the function of oriented cold-rolled silicon steel, and the working magnetic density is much higher than that of non-oriented cold-rolled steel. Electronic transformers must adapt to the volume and weight requirements of the user's power supply products. Silicon steel is the core material used in a large number of electronic transformers in power frequency power supply.

As a downstream power supply user of electronic transformers, it can be selected and purchased globally to form a buyer's market.

In recent years, the prices of core materials and conductive materials used in electronic transformers in power supplies have risen continuously, and upstream raw materials have formed a seller's market. At the same time, unlike the core of R-type, CD-type and EI type, the silicon steel material can be fully utilized, there will be no corner waste, and the material utilization rate can reach more than 98%. The high-temperature and high-saturation magnetically dense soft ferrite material can also expand the upper limit of the temperature used in electronic transformers to 120 or even 150 benefits. In order to reduce the amount of cores used in electronic transformers, it is necessary to improve the working magnetic flux density (operating magnetic density) of silicon steel.

To take the road of technological innovation, we must always remember the goal to be achieved. At the same time, the price of raw materials (core materials and conductive materials) for electronic transformers has risen. As the temperature rises, Bs falls, and Pcv begins to fall, reaching a trough and then rising again. In particular, when the Curie temperature is low, the saturation magnetic density Bs and the power loss Pcv per unit volume will change with temperature. But every small improvement can bring new ideas and new products. Since efficiency is an important functional indicator of electronic transformers, now, in order to save energy, many power products have put forward standby loss requirements.

As a large category of electronic transformers, the power frequency transformer can reduce the number of coil turns and reduce the amount of copper after using the core material with high working magnetic density. In the current situation where the price of copper is much higher than that of core materials, it may be a better design improvement solution. Therefore, under the premise of high temperature, as long as the Bs remains at a high level, the working magnetic density Bm can be selected higher, so as to reduce the number of coil turns, reduce the amount of copper and the cost. The core loss of electronic transformer is the main component of standby loss, so there are clear and strict requirements for the efficiency or loss of electronic transformer. The working magnetic density of silicon steel is determined both by the saturation flux density and by the loss. Therefore, how to reduce the volume and weight, how to reduce the cost, has become the main direction of the development of electronic transformers in recent years.

Soft ferrite is a large number of core materials used in electronic transformers in medium and high frequency power supplies, compared with metal soft magnetic materials, soft ferrite has low saturation magnetic density, low permeability, low Curie temperature, which are its major weaknesses. However, in the mature electronic transformer industry, technological innovation is more difficult. Today's power supply products are generally characterized by "light, thin, short, and small" to develop towards miniaturization and portability.