which ups is best ferrite core or Iron transformer?

Dear friends,
which type UPS is best in all technical aspect, e.g energy efficient, less heat, low mean time between failures, cost effective, durability,
comparing Iron core sine wave ups or ferrite cored sine wave ups?
advance thanks.:-?

bugme said:

Dear friends,
which type UPS is best in all technical aspect, e.g energy efficient, less heat, low mean time between failures, cost effective, durability,
comparing Iron core sine wave ups or ferrite cored sine wave ups?
advance thanks.:-?

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UPS from market without load in standby ! :wink:


Read manufacturer data about concrete product to see response time, efficiency,... also often UPS have 50Hz or 60Hz trafo.
Consider inverter switching technology on higher frequency with smaller trafo (HF trafo - special core, not like for 50Hz) and final weight is smaller.
Heat can be completely controled with water cooling tech. but what price and purpose of all project 8-O ?
Some trafo is made for nominal temp of 75C 80C 90C 110C .... (working temp).

Transformers used at low frequencies, such as 50Hz, 60Hz and 400Hz, require a core of low-reluctance magnetic material, usually iron. This type of transformer is called an IRON-CORE TRANSFORMER. Most power transformers are of the iron-core type.

Quality of market UPS today is discutabile but for good price always can get good product if You look carefully.

In a transformer or inductor, some of the power that would ideally be transferred through the device is lost in the core, resulting in heat and sometimes noise.

There are various reasons for such losses, the primary ones being:

Hysteresis loss
When the magnetic field through the core changes, the magnetization of the core material changes by expansion and contraction of the tiny magnetic domains it is composed of, due to movement of the domain walls. This is a lossy process, because the domain walls get "snagged" on defects in the crystal structure and then "snap" past them, dissipating energy as heat. This is called hysteresis loss. The amount of energy lost in the material in one cycle of the applied field is proportional to the area inside the hysteresis loop. Hysteresis loss increases with higher frequencies as more cycles are undergone per unit time.

Eddy current loss
The induction of eddy currents within the core causes a resistive loss. The higher the resistance of the core material the lower the loss. Lamination of the core material can reduce eddy current loss, as can making the core of a magnetic material nonconductive, like ferrite.


Magnetic core materials

Laminated silicon steel - Because iron is a relatively good conductor, it cannot be used in bulk form with a rapidly changing field, such as in a transformer, as intense eddy currents would appear due to the magnetic field, resulting in huge losses (this is used in induction heating).
Lamination - Laminated magnetic cores are made of thin, insulated iron sheets, lying, as much as possible, parallel with the lines of flux. Using this technique, the magnetic core is equivalent to many individual magnetic circuits, each one receiving only a small fraction of the magnetic flux (because their section is a fraction of the whole core section). Because eddy currents flow around lines of flux, the laminations prevent most of the eddy currents from flowing at all, restricting any flow to much smaller, thinner and thus higher resistance regions. From this, it can be seen that the thinner the laminations, the lower the eddy currents.
Silicon alloying - A small addition of silicon to iron (around 3%) results in a dramatic increase of the resistivity, up to four times higher.
Carbonyl iron - Have high stability of parameters across a wide range of temperatures and magnetic flux levels, with excellent Q factors between 50 kHz and 200 MHz.
Special Iron powder - They are used mostly for electromagnetic interference filters and low-frequency chokes, mainly in switched-mode power supplies.
Ferrite-Iron - Ferrite ceramics are used for high-frequency applications. The ferrite materials can be engineered with a wide range of parameters.
Vitreous Metal - These are being used to create high efficiency transformers. China is currently making wide spread industrial and power grid usage of these transformers for new installations.

I am asking for domestic use about 800Va 12V. which one is based Iron core with E&I lamination or toroidal or smps type?

If you live in low temperatures area the Ferrite Core (known as inverters) are best (in my opinion and experience) and if you live in high temperature area I may suggest to go for Iron Core Transformer. Quality means much in every product type.