DC-DC transformer design and converter technology pace

发布日期:2010.12.01    新闻来源:    查看次数:7483
In recent years, many areas in the electronics industry, engaged in the DC / DC converter design and manufacturing companies are under tremendous commercial and competitive pressures. Market demand has shifted to the small size, high density and more efficient products.
    
In terms of cost, size or performance in terms of the transformer are DC / DC converter designs, a key device. So we are trying to optimize the device ahead of it with the development of semiconductors and passive components to match.
    
Although traditional wire wound transformer is still a lot of the larger form factor used in power applications, but in recent years, the emergence of several new technologies for the DC / DC converter designed to bring significant benefits, one example is the plate transformer.
    
Stand-alone and embedded flat transformer. Stand-alone flat copper plate transformer is to use the copper lead frame or PCB, constitute for the winding. This means that they support than traditional copper wire around the transformer on the possession of the space to be much smaller. Sophisticated or printed circuit copper lead frame design specifications so that more accurate than the wire wound transformers meet the requirements, the level of repeatability between pieces has also been improved.
    
Etched copper-type lead frame or the printed windings are stacked in the plate, and high-frequency ferrite core transformer magnetic circuit form. The design makes it a very low profile transformer components. In the flat panel design to achieve a large cross-sectional area of copper conductor to the high power density and high-current design easier. Winding and the ferrite plate high surface capacity than the product has good heat dissipation.
    
Especially at high operating frequencies, high efficiency planar transformer is a further key benefit. <SPAN title="" xc="在线绕形变压器中,效率被“趋肤效应”逆反影响,即当高频电流通过圆柱形导体时迫使电子由中部流向边缘集中在铜线表面,从而减少了电流通过导体横截面积。" yc="Line around the shape transformers, efficiency is " closure_uid_5bsx2r="67" area.     ? cross-sectional conductor a through current the reducing thereby surface, copper in concentrated central of edge from electrons flow cylindrical forced is high-frequency when ie effect, reverse effect? skin>Line around the shape transformers, efficiency is "skin effect" reverse effect, ie when the high-frequency current is forced through a cylindrical conductor the flow of electrons from the edge of the central concentrated in the copper surface, thereby reducing the current through a conductor cross-sectional area.
    
Complete and assembly from a point of view, there are better than planar transformer winding transformer. Winding transformers usually require manual operation to strip the paint in the winding side, and then hand-dipped tin or solder. Suppression of the planar transformer or etched copper on the surface can be formed terminal posts are often installed to increase the terminal speed and repeatability of the assembly, thereby reducing costs. Together with the embedded planar transformer, this advantage is even more prominent, where ferrite from the DC / DC converters PCB, through, and winding spirally around the printed circuit board layers.
    
Although they take up more than the embedded design space, in recent years, welcomed the independent planar transformer has been increasing degree. For all the embedded transformer using DC / DC converter circuit board as their routing, so each set of input / output voltage is need to design a different circuit boards. Moreover, for embedded graphic design, because the need to use the multi-layer coil to etch circuit boards, so the overall cost is higher. Some hybrid design using the motherboard as the primary winding, and then use a small PCB as the secondary separation to produce different output voltage. This design is also very common.
    
Although the embedded design to achieve high power density and has good thermal performance to achieve the space saving features, but for many applications, these advantages are cost, lack of flexibility and interchangeability of the limit. High production volume will be offset to some extent, the higher the cost of embedded design.
    
More transformer design. Existing transformer design is based on magnetic technology. The future, large-scale acoustic coupling transformer design will be provided to smaller of the potential. Currently, some low-power high-voltage DC / DC converter design has been achieved to some extent.
    
Acoustic coupling transformer using piezoelectric material properties, coupled with a vibrating structure to electrical energy. A converter stimulate a resonance mode of the material, then the second interception of the secondary converter and converted to the secondary voltage.
    
Other developments in the transformer design, the use of high frequency can produce an effective air coupling, so no ferrite. The transformers and other magnetic devices such as integrated into the circuit output chokes is another big start, which will help reduce the DC / DC design of the overall form factor.
    
Finally, the development of new magnetic materials allow higher operating frequency and low loss, which will help to provide a specified power of smaller transformers.
    
Obviously, the winding transformers has become increasingly unsuitable for DC / DC converters and other applications. Its large size, low efficiency and can not meet the difficulties of repetitive pieces means that they are rapidly being replaced by new technology.
    
Embedded and stand-alone planar transformer have their own advantages and disadvantages, design, select one or the other depending on application needs. Tap the secondary (or primary level) transformers provide an innovative and superior to the traditional design advantages. Emphasize again that for a given application will determine the design, whether they are the most appropriate choice. The future, from the transformer magnetic transformer transferred to the development of acoustics seems to produce some exciting new products, and DC / DC converters more and more designers choose to.
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