There are several types of transformers, small transformer types toroidal transformers, square transformers and switching power supply, I believe many customers are not sure how to choose these types of transformers.
A, efficiency
The efficiency of 50W toroidal transformer is 86% -90%, while the working efficiency of 50W square transformer is 80-84%.
400W toroidal transformer efficiency is 90-93%, while the switching power supply 400W efficiency is 78-85%.
B, temperature rise
50W toroidal transformer low temperature rise, 50W square transformer temperature rise.
400W toroidal transformer low temperature rise, 400W switching power supply temperature rise
C, cost
The toroidal transformer above 200W costs less and the square transformer above 200W costs more.
The toroidal transformer above 500W is low cost, the switching power supply cost above 500W is high.
D, interference
Toroidal transformer flux leakage is small, square transformer magnetic leakage obviously, there is low frequency interference.
Toroidal transformer itself basically no interference, switching power supply itself is a source of high frequency interference, high-frequency electromagnetic radiation.
F, life expectancy
Toroidal transformers, square transformers no significant attenuation of life-saving materials, there are still 30 years ago the transformer is still in use.
Switching power supply has a life-saving evidence of significant decline in the use of 10 years ago very little, the life of electrolytic capacitors is the life of the power supply, usually about 2 years.
G, low temperature characteristics
Toroidal transformer, square transformer is still normal 30 degrees below zero, is very suitable for winter outdoor use in the north.
Switch power supply starting 30 degrees below zero difficulty, the north winter with outdoor attention.
H, flexible design
Toroidal transformer volume can be customized according to customer requirements flexible, multi-windings can be customized, custom molds, research and development, design.
Switching power supply custom size mold, mold costs, long time, custom multi-winding, voltage design and development costs need to be high, a long time.
I, overload characteristics
Toroidal transformers, square transformers allow significant short-term overload, can provide excess power, 1-2 times (packaging machinery), can provide excess operating current, 1-3 times (amplifier), can provide excess starting current, 1-3 times (Welding machine)
Switching power supply can not be significantly overloaded, overload.
J, can do high-power waterproof
Toroidal Transformer - Waterproof Transformer waterproof 1000W power is very easy to do, the largest to do 2000W.
DC-waterproof switching power supply heat can not be resolved, the largest 200W.
K, volume weight
Toroidal transformer bulky, can not be regulated, limited size, plus or minus 10% of the input voltage.
Switching power supply light weight, easy transportation and installation, constant voltage output, not subject to the impact of input voltage fluctuations, ultra-thin, ultra-small input voltage can do AC85-265V, 110V and 220V general without switching.
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