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
3,75 GHz RF inductor RF Design
Passive Components
The ceramic chip wire wound inductor from Coilcraft features a DC resistance of 1 O, a DC current of 175 mA, and a self-resonant frequency of 3,75 GHz.
Read more...Upgraded power inductor series iCorp Technologies
Passive Components
Sunlord’s multiphase co-fired power inductor HTF-MP series has upgraded the single-phase HTF-H products in terms of integrated applications.
Read more...Advanced high-voltage capacitors RS South Africa
Passive Components
These new capacitor families from Panasonic are designed for surface-mount and radial lead applications, offering remarkable performance improvements that meet the evolving needs of industrial applications.
Read more...Moulded inductors Future Electronics
Passive Components
Abracon’s mini-moulded inductors bring all the advantages of their larger counterparts, including superior EMI shielding, high power density, and low core losses, despite their compact size.
Read more...New components from KEMET available from TME
Passive Components
Available from KEMET, one of the largest suppliers of passive components, these new components consist of toroidal inductors (ferrites) and capacitors which boast high current performance.
Read more...Miniature reed relay with 80 W rating
Passive Components
Pickering Electronics has introduced its latest high-power reed relay, Series 44, featuring an 80 W power rating, while stacking on a compact 0,25-inch pitch.
Read more...The future of on-board charging Future Electronics
Passive Components
Engineered to elevate charging performance, the selection of Vishay capacitors, resistors, and other passives redefine reliability and efficiency in on-board charging technology.
Read more...Cooling on a chip
Passive Components
This all-silicon, solid-state active cooling chip by xMEMS is designed for thermal management applications for ultra-mobile devices and next-gen AI solutions.
Read more...First 100 µF MLCC in 0603 packaging RS South Africa
Passive Components
Murata is expanding its range of multilayer ceramic capacitors (MLCC) with the groundbreaking new GRM188C80E107M and GRM188R60E107M.
printer friendly version