Ferrite Core Inductor Software Developer
.Inductor Design with Magnetics Ferrite CoresThe 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 current1. Compute the product of LI² where:L = inductance required with DC bias (millihenries)I = maximum DC output current + 1/2 AC Ripple2. 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.3. 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.4. Required inductance L, core size, and core nominal inductance (A L) are known.Calculate the number of turns usingwhere L is in millihenries.5. Example: If I MAX = 8 Amps; L, inductance required = 100 μHenriesLI² = (0.100 mH) X (8² Amps) = 6.4 millijoules6. 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.7.
Some choices based upon an LI² value of 6.4 millijoules are:Pot core 43622 A L = 400 Double Slab 43622 A L = 250PQ core 43220 A L = 300 E core 44317 A L = 2508. 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 = 20Make 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 = 125Maximum allowable H = 25 Oersted (from the graph above)NI (maximum) = 0.80 x H x le = 62.4 ampere-turnsor (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.
As the dashing officer shown above will tell you, early data processing machines and ADP systems employed two types of magnetic cores for memory and other purposes. This 1961 U.S. Army training film is, which are commonly made from nickel alloy and other magnetic materials. As this is only part one of a series, the metallic ribbon type of magnetic core is covered in some other segment we have yet to locate.The use of magnetic cores for random access memory was built upon transformer theory and provided a rugged and low-power solution until the semiconductor came into vogue. Before that time, the humble ferrite core served many uses and did so very well.
The had erasable magnetic core memory, and much of its software was stored in core rope memory.The film covers a lot of theory and does so clearly and concisely. It begins by explaining what a magnetic core is and why it’s used, and then moves on to describe how the cores are used to store bits and the method by which they can transfer information to other cores. Along the way, it provides background on bi-stable devices and provides explanation of magnetization behavior in terms of magnetizing force and flux density.Posted in, Tagged,. We’ve seen NAND and NOR logic gates – the building blocks of everything digital – made out of everything from marbles to Minecraft redstone. kos has outdone himself this time with a logic circuit we’ve never seen before., making a NOR gate out of nothing but a ferrite core, some wire, and a diode.The theory of operations for this magnetic NOR gate goes as follows: If two of the input windings around the core have current passing in different directions, the fields cancel out. This could either be done by positive or negative voltages, or by simply changing the phase of the winding. To keep things simple, kos chose the latter.
The truth table for a simple two-input, one-output gate gets pretty complicated (or exceedingly cool if you’d like to build a trinary computer), so to get absolute values of 1 and 0, a separate ‘clock’ winding was also added to the core.One thing to note about kos’ gate is its innovation on techniques described in the relevant literature. Previously, these kinds of magnetic gates were built with square ferrites, while this version can work with any magnetic core.While this isn’t a very practical approach towards building anything more complex than a memory cell, it is an exercise of what could have been in an alternate universe where tube technology and the transistor just didn’t happen. Posted in Tagged,. Kos tipped us about an article he made presenting his experiences in designing and implementing a.
This magnetic read-only memory (ROM), contrary to ordinary coincident-current magnetic core memories (used for RAM), uses the ferrite cores as transformers. If you look at the picture above, you’ll count 7 of them.
Ferrite Core Inductor Software Developer For Windows 7
This sets the memory word size (7bits). A new word is added to the memory by passing (or not) a wire through the ferrite holes. If you then pass an alternating current through this wire, a current will be induced (or not) in the other wire turned 30 times around the ferrite (alias transformer secondary).In Kos’s setup, an input pulse of 5V generates output pulses of 15V. For demonstration purposes, he “wrote” a simple program that lights up digits in a seven segment display. Therefore, different numbers will light up depending on which wire he uses to pass the AC current.These days core memory hacks are few and far between. But looking at this one, and, makes want more. If you know of any others don’t hesitate to.
Inductor Calculator Ferrite
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