Progressive miniaturisation in power electronics calls for continuous improvement of key parameters such as power dissipation and DC magnetic bias in ferrite materials. With the new N97 material, Epcos has managed to reduce power dissipation below the threshold of 300 kW/m3 at 100 kHz, 200 mT and 100°C. The company explains further.
As seen in Graph 1, the power dissipation is indicated as a function of temperature in the material N97 and material N87 which are ferrites commonly used for power applications. Significant reduction of power dissipation makes it possible to design transformers that can transfer even higher power.
Graph 1. Comparison of power dissipation in materials N97 and N87 at 100 kHz and 200 mT as measured on R34 cores
Transferable power is represented by 'performance factor '(PF): the flux density is increased at constant frequency until power dissipation reaches 300 kW/m3 at 100°C. As a result of constant dissipation, a constant temperature is obtained in the transformer. The product of frequency and flux density is directly proportional to the transferable power. The performance factors of ferrite materials N27, N67, N87 and N97 are compared in Graph 2. N97 has by far the highest over the entire frequency range, making it possible to push back the limits of transferable power over the wide range from 25 to 400 kHz.
Graph 2. Comparison of performance factor (PF) in ferrite materials N27, N67, N87 and N97
DC magnetic bias is another parameter critical to the design of output chokes. It can be characterised by the drop in permeability of the ferrite material under a DC load. The material parameter of the DC field strength HDC is often given as equivalent to the direct current. In the new ferrite material N97, DC magnetic bias has been increased by almost 20% over that of material N87 (Graph 3), thus making it possible to design transformers and converters of higher efficiency.
Graph 3. DC magnetic bias of ferrite materials N97 and N87 at 100°C
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