Toroidal Transformer Applications



When designing a transformer or inductor, Talema deign engineers always ask what the application is. Why is this ?

The application of a magnetic component can have significant implications in determining the most suitable design. Common applications would be :

  • Security Systems

  • Medical Equipment

  • Professional Audio Visual

  • Domestic Audio Visual

  • Distribution / Standards

  • Lighting LVL

  • Lighting Dimming

  • Medical

  • Telecommunication

  • Automotive

  • Control Equipment

  • Motors & Drives

  • Battery Chargers

Each of the above fields of application have their own specific requirements for transformers and inductors.

For example, a power transformer for use in Domestic Audio Visual equipment would usually need to be designed using a low flux-density in the core to reduce the radiated magnetic field, have varnish impregnated core and windings to reduce the, physical "noise", and be wound using very uniform winding machines.
Depending on the equipment design, it may also require a magnetic screen (known as a GOSS Band) to reduce the radiated magnetic field. Generally the transformer must be UL recognised, and also conform the the requirements of EN60065 (IEC65) as a minimum.

Compare this to a toroidal power transformer for use in Low Voltage Lighting (12V Halogen lighting, know as LVL):
The important points for a lighting transformer would be the generated heat, the accuracy of the output voltage which affects the life of the lamp(s), the effectiveness of the overload protection device(s), and generally the physical space into which the transformer must be mounted is very restricted. On top of all this, the transformer must meet all the requirements of "short-cicuit proof" according to EN61558 (replacing EN60742).

Consider a power transformer for use in Medical equipment. There are requirements for the maximum permissible leakage current which can flow from the mains supply to the earth point, so the transformer generally requires a higher level of insulation between the primary winding and the earthed copper screen to ensure that the combination of all the possible sources of leakage current (mains cable, input socket, mains filter, transformer) remains within limits of EN60601 (UL2601).
The transformer will also generally require a thermal fuse or thermal switch of some type, which will switch off the power supply if a fault condition occurs in the equipment.

As may be seen from the above comparisons, the "field of application" of the transformer does indeed dictate certain design criteria, which have an important effect on designing the most suitable component.

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