New high permeability materials for EMI suppression

1. New high permeability materials for EMI suppression • leticia.leon@ferroxcube.com • February 2011

2. Contents • High permeability materials evolution • What is improved? • What is new in 3E10 & 3E12? • 3E10 • 3E12 • Standard range in 3E10 &3E12 • Applications

3. High permeability materials evolution Permeability 12000 3E12 3E10 10000 3E5/6 Tighter tolerance 7000 3E26 6000 3E25/3E27 4300 3C11

4. Whatisimproved in thecommonmodefilter ? • Higherpermeability • Increasecouplingbetweenwindings • thedifferentialmodeimpedanceisdecreased Reduce thesize of thetoroid and/orthenumber of turns of winding less DC resistance cheaper BOM cost Largerbandwidth Extended dumping bandwidth Lowerelectriclosses Betterfrequencystability Lowersignaldistortion Tighterinductancetolerances Lessvariationduetoexternalstressesfromwinding and potting Betterpredictability  More robustprocess and improvedrepeatiblity

5. 3E10 Tighter tolerance (±20%) 3E6 3E12 20% Higher permeability

6. 3E10: Process control with extended bandwidth Tighter tolerance in AL Lower electric losses More stability with frequency Permeability 10000 ± 20% tan δ/μi @ 30 kHz, 25ºC, 0.25mT < 5x 10-6 tan δ/μi @ 100kHz, 25ºC, 0.25mT < 20 x 10-6 We can observe that despite 3E6 higher initial permeability , from 300 kHz upwards, thanks to 3E10 better stability with frequency, extended impedance bandwidth and higher amplitude are achieved Measured on a coated toroid of Ø25xØ15xh10 Lessinfluence of winding and pottingoperationsonpermeability Broaddampingcharacteristics Betterprocess control thankstotheimprovement in impedancestabilitywithfrequency and tolerancereduction

7. 3E12: 20% permeability rise Permeability in productincreases up to 20% comparedto 3E6 and marketequivalents Permeability 12000 ± 30% • Reduction of negative impact of high number of turns like DC resistance and parasitic capacitance • Higherpermeability leads tocoresizeornumber of turnsreductionCost savings either in ferrite material or in copper

8. 3E10 & 3E12 performance overview 3E12 achieves the highest impedance up to 300kHz 3E10 achieves the most extensive widthband Graphs show how impedance vary as a function of number of turns In all cases we observe similar behavior in 3E10 and 3E12: 3E12 higher Z at lower frequencies, whereas lower electric losses of 3E12 lead to wider bandwidth with high impedance in 3E10 Measured on coatedtoroids of Ø25xØ15xh10

9. Range in 3E10 & 3E12 Standard cores in 3E10 and 3E12 are all toroid´s tools from 2.5mm to 63mm Rings are the optimal shape in high permeability to reduce leakage losses • Gapped shapes reduce effective permeability, therefore the advantages obtained for these shapes in 3E10 and 3E12 materials are negligible However, shapes can be manufactured in these materials upon request Samples available

10. Applications The main applications are interference suppression and wideband transformers: Wideband transformers  Impedance transformation over a broad frequency range. Applications include impedance matching, voltage or current transformation, DC isolation, balanced/unbalanced mixing, power splitting, coupling, and signal inversion. Telecommunications devices Pulse transformers Communicationsystems and digital networks Groundfaultinterruptors (GFI)  Home and industrial Interference suppression  Common mode choke. Mains filters in all type of electronic equipment. ATTENTION TO HIGH GROWTH INVERTERS MARKET!!!!!!!

11. Summary

12. Benchmarking Looking at competitors’ highest permeability products we find… FXC offers the tightest tolerance in high permeability Taking all these factors into account, it is difficult to find such high quality product in the market 12000 the largest size with the maximum permeability ±20% 63 63 and the lowest electric losses 5 7