Most applications of iron powder cores are substitutions of inductors made of ferrite cores. These applications include DC/DC converter output filter inductors and power factor correction inductors. In these applications you need the energy storage capability (proportional to $ B times H $; all quantities are magnitudes) of the inductor core. I was suggested to use an iron core for an inductor. I found that it has low permeabilty and good stability, but how does that make it a good material for the core. Web Software SimSurfing(WEB). Ferrite Core Ferrite cores are. Inductor Design with Magnetics Ferrite Cores.
Click to expand.A ferrite core will permit achievement of the desired inductance with fewer turns but at the 'cost' of hysteresis losses and liability to saturation - Hence appropriate core selection (i.e. Material and cross-section) will properly be with regard to operating frequency and current (respectively). Please be advised that toroidal cores offer advantages in the ways of compactness and 'self-shielding'. Please note that the resource linked in (post #6) features several core forms (including toroids and solenoids) available in a large variety of materials. Best regards and good luck! HP Disclaimer - I am not, in any way, associated with Amidon! - That said; It is my strongly held opinion that their policy of comprehensive applications documentation distinguishes them as the 'go to' supplier for new design!
A ferrite core will permit achievement of the desired inductance with fewer turns but at the 'cost' of hysteresis losses and liability to saturation - Hence appropriate core selection (i.e. Material and cross-section) will properly be with regard to operating frequency and current (respectively).
Please be advised that toroidal cores offer advantages in the ways of compactness and 'self-shielding'. Please note that the resource linked in (post #6) features several core forms (including toroids and solenoids) available in a large variety of materials. Best regards and good luck! HP Disclaimer - I am not, in any way, associated with Amadon! - That said; It is my strongly held opinion that their policy of comprehensive applications documentation distinguishes them as the 'go to' supplier for new design!
A ferrite core will permit achievement of the desired inductance with fewer turns but at the 'cost' of hysteresis losses and liability to saturation - Hence appropriate core selection (i.e. Material and cross-section) will properly be with regard to operating frequency and current (respectively).
Please be advised that toroidal cores offer advantages in the ways of compactness and 'self-shielding'. Please note that the resource linked in (post #6) features several core forms (including toroids and solenoids) available in a large variety of materials. Best regards and good luck! HP Disclaimer - I am not, in any way, associated with Amidon! - That said; It is my strongly held opinion that their policy of comprehensive applications documentation distinguishes them as the 'go to' supplier for new design!
. Inductor Design with Magnetics Ferrite Cores The following design guide may also be. For other inquiries regarding inductor design with Magnetics ferrite cores, or submit a. Ferrite E cores and pot cores offer the advantages of decreased cost and low core losses at high frequencies. For switching regulators, power materials are recommended because of their temperature and DC bias characteristics.
By adding air gaps to these ferrite shapes, the cores can be used efficiently while avoiding saturation. These core selection procedures simplify the design of inductors for switching regulator applications. One can determine the smallest core size, assuming a winding factor of 50% and wire current carrying capacity of 500 circular mils per ampere. Only two parameters of the design applications must be known: (a) Inductance required with DC bias (b) DC current 1.
Compute the product of LI² where: L = inductance required with DC bias (millihenries) I = maximum DC output current + 1/2 AC Ripple 2. Locate the LI² value on the below. Follow this coordinate in the intersection with the first core size curve. Read the maximum nominal inductance, A L, on the Y-axis. This represents the smallest core size and maximum A L at which saturation will be avoided. Any core size line that intersects the LI² coordinate represents a workable core for the inductor if the core’s A L value is less than the maximum value obtained on the chart.
![Ferrite Core Inductor Software Applications Ferrite Core Inductor Software Applications](/uploads/1/2/5/4/125408156/924073972.jpg)
Required inductance L, core size, and core nominal inductance (A L) are known. Calculate the number of turns using where L is in millihenries. Example: If I MAX = 8 Amps; L, inductance required = 100 μHenries LI² = (0.100 mH) X (8² Amps) = 6.4 millijoules 6. There are many ferrite cores available that will support the energy required. Any core size that the LI² coordinate intersects can be used at the A L value shown on the chart. Some choices based upon an LI² value of 6.4 millijoules are: Pot core 43622 A L = 400 Double Slab 43622 A L = 250 PQ core 43220 A L = 300 E core 44317 A L = 250 8. For the following AL values the number of turns required is: A L = 400, N = 16 A L = 300, N = 19 A L = 250, N = 20 Make sure the wire size chosen will support the current and fit into the core set.
The above curves represent the locus of points up to which effective permeability remains constant. They show the maximum allowable DC bias, in ampere-turns, without a reduction in inductance. Beyond this level, inductance drops rapidly.
Example: How many ampere-turns can be supported by an 0R42213A315 pot core without a reduction in inductance value? Le = 3.12 cm μ e = 125 Maximum allowable H = 25 Oersted (from the graph above) NI (maximum) = 0.80 x H x le = 62.4 ampere-turns or (Using top scale, maximum allowable H = 20 A.T/cm) NI (maximum) = A.T/cm x le = 20 x 3.12 = 62.4 A.T.