Core losses insulation

I will be using an E-E core since it has the largest wire area of all the core styles. The large wire area will be needed for all the additional insulating layers required for the VDE certification. No air-gap is needed for bipolar forwardmode converters. The core material is going to be 3C8 (Ferroxcube) or F (Magnetics, Inc.) material. This material will yield reasonable core losses at this frequency. 

I will be using an E-E eore with the neeessary Mylar tape insulating layers to meet the isolation requirements of the safety approval ageneies. At these operating frequeneies, a high-frequency core material will have to be used to minimize the core losses at 1 MHz. The material should be the K material from Magnetics, Inc, 3C85 material from Phillips, or N67 material from Siemans. 

Eddy current loss. The time-varying flux not only induces current in the secondary winding of the transformer but also induces circulating currents in the core as well (Fig. 2.37(a) and Fig. 2.37(b)). These eddy currents, as they are called, cause ohmic heating of the core and hence a loss of power. Power transformers normally have laminated cores made of alternate layers of iron and insulating material to coil erupt the flow of the eddy currents and thus reduce the eddy current loss (Fig. 2.37(c)). 

The primary criteria for HVAC duct woik is that it should be of noncombustible constmction. The duct work should be metal and, if at all possible, not insulated. It is important that foam plastics ate not used to insulate the interior of the air handling unit. The duct work should be separate from other building eomponents. When composites are used, they should not have plastie cores. The PVC plastic cores could greatly contribute to a eontamination loss, or the panels with the polypropylene eore will contribute to a fire. 

---