Etals planar transformers are developed for high-frequency power conversion applications where compact size, efficiency, and thermal performance are critical. Utilizing flat windings and advanced PCB-based construction, they offer reduced profile, improved heat dissipation, and excellent repeatability in manufacturing. Ideal for switch-mode power supplies, converters, and modern electronic systems, planar transformers deliver high power density, low losses, and enhanced reliability in space-constrained and high-performance environments.
Etal’s Planar Transformer solutions
We have developed enhanced ways to produce 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, with terminations and mounting options tailored to customer-specific and application-specific requirements.
Typical Applications for Planar Transformers
Planar transformers are used in many modern power electronics where small size, high efficiency, and reliable performance are important. Typical applications include:
- Switch-mode power supplies (SMPS)
- DC-DC converters
- Industrial automation systems
- Telecommunications equipment
- Data centers and server power systems
- Renewable energy systems (solar and wind inverters)
- Electric vehicle (EV) power electronics
- Aerospace and defense electronics
- Medical power supply units
- High-performance consumer electronics
Planar Transformers Advantages
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 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).