STS develops customised power transformers for switched mode power supplies in all the usual switching topologies, such as:

• flyback converters
• forward converters
• push-pull converters
• resonance converters
• quasi resonance converters
• current doublers
• Cuk converters

In order to obtain the desired technical characteristics, a wide variety of core materials, conductors and designs are used.

Core materials used:

• soft ferrites
• amorphous core materials
• nanocrystalline core materials
• tape-wound SiFe cores

Conductors used:

• solid copper wires with round and rectangular shapes
• litz wires (Cu)
• copper foil strips
• tube materials for direct water cooling (Cu, Al)

Designs:

• bobbin core windings
• toroidal core windings
• lead frame windings (planar transformers)

Technology
Since all parasitic characteristics of a power transformer (including leakage inductance, winding capacity, thermal gradient) grow with its mechanical dimensions, the transformer is normally optimised to create the smallest possible geometry.

This optimisation through to the greatest possible power density is backed not only by technical reasons, but also commercial ones. A lower space requirement normally involves a variety of ways to save costs.

A major feature for the operational reliability of electronic components is the freedom from partial discharges in the insulation system (corona abatement). STS develops and manufactures products with partial-discharge-stable insulation systems up to 10 kV.