By Alex Goldman
Magnetic elements for energy Electronics issues the real concerns helpful within the selection of the optimal magnetic part for strength digital functions. those comprise the topology of the converter circuit, the center fabric, form, dimension and others similar to price and power part providers. those are all vital for the layout engineer a result of emergence of recent fabrics, alterations in provider administration and the examples of numerous part offerings. providers utilizing this quantity also will comprehend the desires of designers.
- Emphasis on lately brought new ferrite fabrics, reminiscent of these working at megahertz frequencies and less than greater DC force stipulations;
- dialogue of amorphous and nanocrystalline steel fabrics;
- New applied sciences reminiscent of resonance converters, energy elements correction (PFC) and tender switching;
- Catalog details from over forty magnetic part providers;
- Examples of equipment of part selection for ferrites, amorphous nanocrystalline fabrics;
- details on providers administration adjustments comparable to these taking place at Siemens, Philips, Thomson and Allied-Signal;
- consciousness to the more and more vital matters approximately EMI.
This publication could be specifically priceless for strength digital circuit designers, technical executives, and fabric technology engineers concerned with strength digital components.
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Extra resources for Magnetic Components for Power Electronics
12. 13. 14. 15. 16. Amplitude Permeability Saturation Induction Saturation vs Temperature Core Loss vs Frequency Core Loss vs Temperature Core Loss vs Induction Permeability vs Temperature Permeability vs DC Bias Curie Temperature Resistivity Coercive Force Density Complex Permeability Remanence and Squareness Performance factor, PF These properties are ones that just defme the material as opposed to ones that define the component. The latter properties will be discussed in a later chapter. Vendors of ferrite cores will mostly always show many of these parameters in their listing of material properties in their catalogs.
An external logic circuit serves to control the duty cycle of the main switch, Q1 to raise the input voltage, Vi to the output voltage, Vo. Higher peak ac flux densities are present than in conventional output chokes so core losses are quite important here. If the wrong core or material is used, core losses will increase and the possibility of thermal failure may occur. As in the case of the output choke, the materials used are the various types of powder cores (iron, molyperm, high flux NiFe, Sendust) or a gapped ferrite.
Bosley (1994) also listed the advantages and disadvantages of the competing materials for SMPS transformers. 4 for ferrites. Snelling C1996) presents a plot of the power loss density of power ferrite, Co-Fe amorphous metal strip and the Vitrovac 6030 nanocrystalline material vs frequency in figure in next chapter. The relative advantages in core loss depend on the frequency and flux density. The previous comparisons did not include the nanocrystalline materials that gained recognition shortly after the Bosley article even though Yoshizawa (1988) reported on them earlier.