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The innovative way out of electronic transformers
Release time: 2016-10-23 Click times: 1273 times
The electronic transformer industry in the middle position can only get rid of this dilemma by taking a road of technological innovation. The electronic transformer in the power supply, like any product that is a commodity, undergoes any technical innovation. It must complete the detailed function under the premise of detailed use. The pursuit of the best price-performance ratio.
Over the past year, the prices of oriented and non-oriented cold-rolled silicon steel have risen. The coiled toroidal core is comparable to the R, CD and EI cores. Because it consumes less material, it can save more than 20% of the core material cost and expand the electronic transformer Range of use. The coiled toroidal core can fully perform the function of oriented cold-rolled silicon steel. Compared with non-oriented cold-rolled steel, the working magnetic density is much higher. Electronic transformers must meet the requirements for volume and weight as a user's power supply product. Silicon steel is a core material used extensively in electronic transformers in industrial frequency power supplies.
As a power supply user of downstream electronic transformers, they can choose and purchase globally to form a buyer's market.
In recent years, the prices of iron core materials and conductive materials used in electronic transformers in power supplies have continued to rise, and upstream raw materials have formed a seller's market. At the same time, unlike the R-type, CD-type and EI-type cores, silicon steel materials can be fully used without corner waste, and the material utilization rate can reach more than 98%. The high temperature and high saturation magnetic dense soft ferrite material can also expand the temperature limit used by electronic transformers to 120% or even 150%. To reduce the amount of iron used in electronic transformers, it is necessary to improve the working magnetic flux density (working magnetic density) of silicon steel.
To take the road of technological innovation, always remember what you want to achieve. At the same time, the prices of raw materials (core materials and conductive materials) for electronic transformers have risen. The temperature rises, Bs decreases, Pcv begins to decrease, and then rises again after reaching the valley point. Especially if the Curie temperature is low, the saturation magnetic density Bs and the power loss per unit volume Pcv will change with temperature. But every small improvement can bring new ideas and new products. Since efficiency is an important performance indicator of electronic transformers, many power supply products now require standby losses in order to save energy.
As a major class of industrial frequency transformers for electronic transformers, after using a core material with a high working density, the core section and volume can be reduced, but the number of coil turns and the amount of copper used can be reduced. Now that the price of copper is far higher than that of iron core, it may be a better design improvement solution. Therefore, under the premise of high temperature, as long as Bs maintains a high level, the working magnetic density Bm can be selected higher, thereby reducing the number of coil turns, reducing the amount of copper and cost. The core loss of the electronic transformer is the main component of the standby loss. Therefore, there are clear and strict requirements for the efficiency or loss of the electronic transformer. The working magnetic density of silicon steel is determined by both the saturation magnetic flux density and the loss. Therefore, how to reduce the volume and weight and how to reduce the cost has become the main direction of the development of electronic transformers in recent years.
Soft ferrite is a core material that is widely 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 magnetic permeability, and low Curie temperature. Big weakness. However, in the mature electronic transformer industry, technological innovation is more difficult. Current power products are generally miniaturized and portable with the characteristics of "light, thin, short, and small".
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