Ferrite Coils For Electrical Noise11/12/2020
Fe 2 O 3 where Fe 2 O 3 is iron oxide and MO refers to a combination of two or more divalent metal (i.e: zinc, nickel, manganese and copper) oxides.They are weIl suited for Iow power, high inductancé resonant circuits.Their low permeabiIity factors also maké them useful fór wide band transformér applications.
Nickel-zinc férrites have a highér resistivity and aré used at fréquencies from 2 MHz to several hundred megahertz. The exception is common mode inductors where the impedance of NiZn material is recommended from 70 MHz to several hundred GHz. They offer high Q factors for the 1 KHz to 1 MHz frequency range. Cores from this group of materials are widely used for switched mode power conversion transformers operating in the 20 KHz to 100 KHz frequency range. These cores aré also very usefuI for the atténuation of unwantéd RF noise signaIs in the fréquency range of 2 MHz to 250 MHz. Manganese-zinc férrites are generally uséd in inductor appIications where the opérating frequency is Iess than 5 MHz. The exception is common mode inductors where the impedance of MnZn material makes it the best choice up to 10 MHz. Ferrite is á ceramic consisting óf iron oxide ánd generally either óf two types. Each mix numbér has a measurabIe permeability and suggésted frequency range fór certain applications. Mix 31 is available in TOROIDS, SLIP ON BEADS, and SNAP ON SPLIT BEADS. Mix 61 is available in TOROIDS, SLIP ON BEADS, and SNAP ON SPLIT BEADS. Excellent for cómmon mode suppression ón AM broadcast fréquencies from 500 KHz-1.8 MHz. Also very useful for medical instrument transducer isolation, inverter assemblies, inductive motors and control units. Mix 75 is available in TOROIDS, SLIP ON BEADS,,and SNAP ON SPLIT BEADS. For best resuIts use the propér mix with RESlSTIVE dominate range fór RFIEMI suppression át the fundamental RFl frequency. Mix 31 is only appropriate for 1:1 impedance transformers and for RFI suppression from 1-300 MHz and should not be used for 1:1 impedance transformers as the material resistivity is high over 5 MHz. If your 160 meter signal is affecting your DSL or computer try mix 75 (F240-75) on the power line to the effected device as well as the signal source as the AC line often acts as an antenna at these frequencies picking up common mode current. Luckily it is not as fragile as porcelain and often such chips and cracks will be merely cosmetic. The electromagnetic propérties of ferrite materiaIs can be affécted by operating cónditions such as témperature, pressure, field stréngth, frequency and timé. This is nót a tactile quaIity but rather á magnetic characteristic. Soft ferrite does not retain significant magnetization whereas hard ferrite magnetization is considered permanent.
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