Multiple links go hand in hand
Author: Group-Tek. Electronic Technology Co., Ltdissuing time:2017-05-05 17:13:03Pageviews:644【smallinBig】
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...
Text labels:
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
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