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From xppower.com
Fractional turn transformers are not a new idea but it's not a concept that
appears to have been applied to AC/DC power supplies in the past. For multiple
output power supplies in particular it offers some significant advantages in terms
of saving space, cutting cost and improving efficiency. Here's why.
The challenge comes when you need multiple outputs. In a power supply where 5V and 12V outputs are needed, it would be ideal to have the 5V winding as a single turn on the transformer, but the 12V winding then becomes 2.5 turns, which can't be manufactured.
One solution is to make the 5V winding two turns, then 5 turns are needed for the 12V winding. But the low voltage, high current, 5V winding has to carry the full rated load of that output, so its made from thick copper foil, and the transformer has to become much larger if the number of turns is doubled. In another common scenario, you may need 5V and 3.3V outputs. Normally, a regulator is used on the 5V output to produce the 3.3V rail. This lowers efficiency, eats up board space and adds costs.
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Medical power supplies produce conditioned outputs for medical devices, instruments, and equipment.
Transformer Test Equipment consists of specialized test modules or systems used to test and/or monitor electrical and mechanical parameters of transformers and other related devices.
Power transformers convert power-level voltages from one level or phase configuration to another. They can include features for electrical isolation, power distribution, and control and instrumentation applications.
DC power supplies accept an input power and output the desired form of DC power. Common types of DC power supplies include linear power supplies, switching power supplies, DC-DC converters, and silicon controlled rectifier (SCR) type power supplies.
Transformer winding services design transformers and other magnetics products for application-specific and OEM usage in a variety of industrial, medical, military, aerospace, telecommunications, commercial and specialty applications.
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Fractional Turns Transformers Save Space, Cut Costs, And Improves Efficiency Of AC/DC Power Supplies (.pdf)
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