Questions tagged [core]
The core tag has no usage guidance.
98
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Calculating Core Loss Coefficient (Kfe) for Ferrite Materials
I'm having trouble calculating the core loss coefficient Kfe for ferrite materials. I'm referencing Chapter 15 of "Fundamentals of Power Electronics" by Robert W. Erickson and Dragan ...
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Characterize ferrite cores, e.g. core losses
How can I characterize ferrite cores? I can measure saturation, but how can I measure core losses so I can decide what frequency to run them at?
I could charge a primary winding to a certain current, ...
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How do steel laminations reduce eddy current losses in a transformer?
All online materials I have read so far state that laminations reduce eddy currents but how is this so? I mean why would currents be smaller this way than having a big block of unlaminated iron core ...
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Transformer magnetics design
In transformer design, can someone help me understand how the no load flux is relevant to the transformer efficiency? What design parameters put constraints on the maximum core flux? Let's suppose I ...
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Find the area product of a core
I need assistance in solving this question. I am confused as to what formula to use to find the Ap, as i searched and found that there many differen variations to find Ap. I need the Ap to be in cm^4. ...
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How can I calculate the size of a power ferrite core transformer?
I'm working on an amplifier that has to drive a load with 200 W at 100 kHz.
I have a tested architecture based on wideband ferrite transformers but for 50 W and higher frequency.
My goal is to ...
- 91
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641
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flux density value in a transformer
I am working on making a simple step-down transformer whose input will be 220V and output will be 12 V. The formula I have seen for calculating the turns per volt being calculated by the following ...
user340506
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201
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Frequency and transformer size
I have seen in many places where people mention that as the frequency of the input signal increases then the size of the transformer decreases. But as far as I have seen the formula for the ...
user340506
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Transformer winding direction
I am designing a center tapped transformer with 220V AC input and 12-0-12 V output. I am using a shell type core. I have a problem in choosing the direction for the turns in the centered tapped ...
user340506
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208
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Short circuit on a coil
We are currently manufacturing some coil assemblies. Our customer reported that some of the coils we shipped had failed once they received them.
Some of the coils failed at the customer's incoming ...
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114
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Multicore CPU design dilemma on reading from/writing to hardware devices
I have built a simple 8-bit processor with 16-bit address lines and 8-bit data lines; not the most efficient CPU architecture, but it does the job. As you might have guessed, this CPU is really simple:...
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Intuition about inductor/transformer core shape nomenclature and performance impact
Due to some future projects, I feel I have to get more accustomed to winding my own transformers/inductors, so I have been reading about ferrite cores lately. One thing I can't really develop a ...
- 22.5k
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Does a parallel air gap increase or decrease maximum energy stored in magnetic field of an inductor?
I understand that a serial air gap increases the amount of energy that can be stored in an inductor.
The reasoning is as follows: according to Gauss's law for magnetism, divergence of B-field is zero. ...
- 1,782
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Can the secondary voltage of this old transformer be derived?
Images are of an unknown "4808" PCB-mounted transformer. It has an open 240 VAC primary.
Data: EI48 core, around 12-15VA. The center-tapped secondary is 15Ω-CT-15Ω and 1.6H-CT-1.6H according ...
- 16.3k
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Transformer copper loss
In this Example the efficiency for a full-load transformer was asked to solve. The book calculated the copper losses after referral to the secondary side as the following : Pcu = (Is)^2Req = (65.2 A)^...
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