I have been doing lots of research and purchasing components to build a high power switchmode power supply, first part i have decided to tackle is the high frequency power transformer, i am using an EE80 core, in the research i have done primary turns are calculated as follows:

Primary Turns = (voltage * 10^8) / (4 * Frequency(hz) * Max Flux Density(gauss) * Effective Core Area(cm^2)

Voltage = 3

If one takes a transformer with 3 identical windings and they use 2 of those windings as a primaries ( not secondaries ), wired independently of each other and IN PHASE, but also with identical in-phase input signals of the same amplitude and frequency;- would the single winding used as a secondary output be the sum of the two inputs ?
( ie: twice the input signal current and the same voltage.)

Assuming that both the windings of a transformer is wrapped around an iron core, how is an EMF induced in the secondary winding - isn't it necessary for flux to cut through the winding in order to induce an EMF?

Most of the flux from the primary remains inside the iron core while completing its loop and very little of it cuts the secondary winding (in an ideal transformer all the flux should rema

Using the formula Zp = (Np/Ns)^2 x Zs

One primary winding of a transformer with 100 turns

Two secondary windings

One of the secondary windings has 50 turns with 10ohms of RL and the second has 25 turns with 25ohms of RL

Calculate the primary impedance Zp in the primary winding.

100/50 sqrd x 10ohms of Zs which is RL gives 40 ohms for the zp of one of the secondary windings.

100/2

For using a different gauge wire in a transformer winding(by using parallel windings of less thickness), is there any design equations or methods?
Do we need to match the resistance and inductance of the designed winding with the equivalent windings in parallel?
How can we measure the inductance if transformer is working at 100kHz frequency with a ferrite core?

I have a hankering to make a high-voltage SMPS, but I want to avoid having to wind my own transformer.

I have been looking at some old off-line ATX power supplies, and they all seem to use a half-bridge to step down half the supply voltage (about 300Vdc where I live) to +/-12V etc.

Hi.

My question is refer to the isolated SMPS which convert 120vac-220vac to ___ (whatever)DC voltage.

I read that after the DC inverted by the oscillator to high frequency AC voltage,it pass through high frequency transformer and in the output of the transformer,it pass through a rectifier.
Why there is a rectifier in that stage?
I know that there is variation in voltage,but isn't the H

Hello everyone I need some help
I am an expat living in Italy, and brought some household appliances from the us, forgetting that even with the adapter plug, the voltage is still at 220.

I dont want to pay $140 for a 1000w step down transformer, I have access to motor wire, and steel. Thus I think it would be cheaper if I built one.

So for part A, I have an ideal transformer connected to a couple resistors.

*All voltages and currents I am assuming are rms in the problem because i don't want to type RMS for each one.*

a) So I did a source transformation to make the current source into a voltage source.