Planar Transformers

Planar technology is a relatively modern process that allows transformers to operate at a high frequency.

Unlike the conventional “wire-wound-on-a-bobbin" transformers, planar transformers use flat windings, usually on a printed circuit board or insulated copper plates, instead of copper wire to form the coils.

The advantage of these transformers and inductors relate to the higher efficiency offered, with a typical efficiency of 99% being achieved, while their low profile makes them especially suitable for high density equipment designs. Other benefits of planar construction are very low and repeatable leakage inductance, and minimum Electro Magnetic Interference (EMI).

AGW have developed enhanced ways to produce chokes and planar transformers. Using a system of sealing the copper plates inside a plastic envelope, insulation integrity is ensured. Another system using a winding technique similar to that used in conventional chokes and transformers, provides a cost-effective alternative.

They are available in power ranges from a few Watts to several Kilowatts, and their terminations and mountings can be tailored to customer requirements.

Summary of the Advantages of Planar Transformers include:

  • High Efficiency +99%
  • Low Profile
  • Light Weight
  • Highly Efficient Cooling
  • Low Leakage Inductance
  • Tightly Controlled Parasitics
  • Multiple Winding Options
  • Customised Terminations
  • Dimensional Accuracy
  • Ease of Interleaving

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