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Author: Group-Tek. Electronic Technology Co., Ltdissuing time:2017-05-05 17:13:03Pageviews:152smallinBig

Many of the world\'s advanced electronic transformer technology, production technology and products are brought together in our country. Faced with such a variety of platforms, technical exchanges ar...
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Many of the world's advanced electronic transformer technology, production technology and products are brought together in our country. Faced with such a variety of platforms, technical exchanges are promising.

Abstract: Many of the world's advanced electronic transformer technology, production technology and products are brought together in our country. Faced with such a variety of platforms, technical exchanges are promising.

In recent years, the power of electronic transformers used in the core material and conductive material prices rose continuously, the upstream raw materials to form the seller's market. As a downstream power transformer for electronic transformers, users can choose and purchase on a global scale to form the buyer's market. In the middle of the electronic transformer industry, only take the road of technological innovation in order to get rid of this two gas storm. However, in the mature electronic transformer industry, technological innovation is more difficult. But every small part of the improvement, you can bring new ideas and new products.

Take the road of technological innovation, we must always remember to achieve the purpose. The electronic transformer in the power supply, like all the products as a product of any technical innovation, must be in the specific conditions of use to complete the specific functions, the pursuit of the best cost performance. Now the power supply products, generally in the "light, thin, short, small" features to the miniaturization and portable development. The electronic transformer must be adapted to the user's power supply for the volume and weight requirements. At the same time, electronic transformers raw materials (core materials and conductive materials) prices. Therefore, how to reduce the size and weight, how to reduce costs, become the main direction of the development of electronic transformers in recent years.

Silicon steel is a large number of core materials for electronic transformers in power frequency power supply. To reduce the amount of iron in the electronic transformer, it is necessary to improve the working magnetic flux density (working magnetic density) of the silicon steel. The working magnetic density of the silicon steel is determined by both the saturation magnetic flux density and the loss. Because the efficiency is an important performance indicator of electronic transformers, and now, in order to save energy, many power products are proposed standby loss requirements. The core loss of the electronic transformer is the main component of the standby loss, therefore, the electronic transformer efficiency or loss of a clear and strict requirements.

In recent years, the orientation and non-oriented cold-rolled silicon steel prices, winding ring core, compared to R-type, CD-type and EI-type core, due to less consumption of materials, you can save more than 20% of the core material costs, The use of the transformer. Winding ring core can give full play to the performance of oriented cold-rolled silicon steel, compared with non-oriented cold-rolled steel, working magnetic density is much higher. At the same time, unlike the R-type, CD-type and EI-type core, you can make full use of silicon steel materials, there will be no corners of waste, material utilization can reach more than 98%.

As a variety of electronic transformers frequency transformer, the use of high magnetic core work material, you can not reduce the core cross-section and volume, but to reduce the number of turns, reducing the amount of copper. In the case of copper prices are now much higher than the core material in the case, may be a better design improvement program.

The soft magnetic ferrite is a large-scale use of the electronic transformer in the middle and high frequency power supply. Compared with the soft magnetic material, the soft magnetic ferrite has a low saturation magnetic density, low magnetic permeability, and low Curie temperature. Several major weaknesses. In particular, Curie temperature is low, saturated magnetic density Bs and unit volume power loss Pcv will change with temperature. Temperature rise, Bs decline, Pcv began to decline, to the valley after the rise. Therefore, under high temperature conditions, as long as the Bs remain at a high level, the working magnetic flux Bm can be selected higher, thereby reducing the number of turns, reducing the amount of copper and cost. High temperature and high saturation magnetic soft magnetic ferrite material, but also can expand the use of electronic transformer temperature limit to 120 benefits or even 150 benefits.

For example, high-frequency electronic transformers in automotive electronic equipment, in the external temperature conditions change and the engine room fever under high temperature conditions, it must use high temperature and high saturation magnetic soft magnetic ferrite. Soft magnetic composite material (SMC) is a new type of soft magnetic material developed in the 1990s. The starting point is to expand the working frequency of the soft magnetic material to the MHz and GHz levels, so the metal soft magnetic material and other high resistance Materials such as quartz, ceramics, polymer materials, etc. together, as long as the control of the volume of metal soft magnetic material in the percolation limit below, it is possible to maintain soft magnetic properties, but also reduce the various high frequency loss, as a new Soft magnetic materials - soft magnetic composite materials, take the English name of the first letter, referred to as SMC material.

The magnetic particles in the soft magnetic composite material may be pure iron, nickel, cobalt metal, iron-nickel alloy, iron-nickel-molybdenum alloy, iron-aluminum alloy, iron-based amorphous alloy, iron-based nanocrystalline alloy and soft ferrite Made of powder.

The non-magnetic object may be an insulating material such as silicon dioxide, a polymer material such as silicone resin, polyethylene or epoxy resin, and a lubricant such as a stearic acid or the like. Magnetic particles and non-magnetic objects after mixing, can be insulated, compression molding, sintering and other processes into magnetic core, you can also use the current plastic engineering technology, injection into a variety of complex shape of the core. Soft magnetic composite material has the advantages of small density, light weight, high production efficiency, low cost, good product consistency. The disadvantage is that magnetic particles are separated by non-magnetic objects, magnetic blocking, permeability is now generally within 100, recently reported through nanotechnology and other measures, has developed a magnetic permeability of more than 1000 soft magnetic composite , Up to 6000.

 

Polymer soft magnetic composite materials in recent years has developed rapidly, in foreign countries have been using this material to create high-frequency power transformers and inductors, and the establishment of the corresponding analysis theory and design procedures. According to the author, although the domestic research and development of polymer soft magnetic materials, but has not yet seen for the power supply in the electronic transformer reported.

Now, the country is developing for the power of electronic transformers in a variety of aluminum wire. Some companies have developed copper clad aluminum wire, copper wire in the outer layer, accounting for 15% of the total area of 3.63g / cm3, taking into account the effect of the table and the adjacent effect, this copper clad aluminum wire resistivity than pure aluminum A lot less, and the cost increase is not much, is a full play the effect of copper and aluminum composite materials.

In recent years, another noteworthy trend is the use of high temperature index, high heat-resistant grade 180 polyesterimide QZY enameled wire and 220 polyimide QYZ enameled wire, wire current density increases, wire diameter decreases Copper reduction, core window area reduced, with the amount of iron is also reduced, can reduce the overall cost. Especially for the small size of the demand for high-frequency low-power power transformers, the use of better heat-resistant enameled wire, but also shows the technical and economic benefits.

Power technology and power electronics technology included in the AC voltage conversion technology, is a "pure" electronic transformer, but also to low-voltage into a high-voltage step-up conversion, or high pressure into a low pressure for buck conversion, the main method Is to use power electronics technology to improve the frequency of energy conversion, thereby reducing the size of the transformer and inductor in the circuit, not to cancel the transformer and inductors. Previously, the combination of power electronic circuits and electronic transformers did not pay enough attention.

In recent years, with the power system requirements to reduce the input and output harmonics, to improve the network side power factor, to achieve "green transformation" of the increasingly high voice at home and abroad to carry out the "power electronic transformer" research, only the rise of research and development boom. How to use power electronics technology to transform and control power, with power electronic transformer instead of the traditional electromagnetic distribution transformers. There are a variety of circuit forms such as single-phase transform and three-phase transform. This type of power electronic transformer can be used not only in the field of high voltage and high current power, but also in high voltage or low voltage small current field, such as some high voltage power generator and small Power regulator power supply.

China engaged in electronic transformer research, development and production of the unit has more than 2000, including state-owned, private and foreign-funded enterprises. The world's largest manufacturer of electronic transformers Pusi company and the world's largest manufacturer of soft ferrite Japan TDK companies have production bases in China. Many of the world's advanced electronic transformer technology, production technology and products are brought together in our country. Faced with such a variety of platforms, technical exchanges are promising.
2017-05-05 152People browsing Back

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