The planar transformer is special designed for low profile & low loss but high power application. Compared with traditional toroidal transformer, laminated core transformer, etc., the planar transformer can be through-hole mounted to the board, or can be integrated into PCB directly , thus the low-profile transformer that could handle a range of current values work. A PCB with traces to from the winding creates the planar form factor. The advantage including:

ultra compact flat structure

These PCB planar transformer are much thinner than other similar specs transformers, with sleek design of thin enclosures.

good heat conduction performance

Thin planar transformer over a wider area maybe request more board space, but more excellent heat dissipation during operation.

high power density & less AC loss & repeatable leakage inductance

Planar PCB transformer compact design reduce leakage inductance, with higher power density & efficiency, typical values even reach 99%.

less AC loss

Low stray intra-winding capacitance

The planar transformer stray capacitance within a winding quite low, because inputs & outputs far from each other on the board.

Customized Planar Transformer Design Suppor ted:

Optimal power range: 500W - 50kW

Maximum rated current: 200A Max

Optimum frequency range: 60–500 KHz

Installation mode: perforated installation (THT)

Topology: full bridge, full bridge (ZVS), half bridge, half bridge (ZVS), push-pull, resonance, flyback

During design a planar transformer,  following points needed to be considered carefully:

Limitation of current capacity

As planar traces form winding, the design request to ensure sufficiently low-temperature rise.High current limitation ask for more board space during design.

Limitation of current turns ratio

Different current ratings request different trace, PCB size maybe limited your planar transformer's footprint size.

High tooling cost

Not like standard transformer with readily available materials, the planar transformers request putting the components through the standard PCB fabrication process.

High stray inter-winding capacitance

The stray capacitance between windings can be rather high due to the arrangement of coils on different layers of the PCB.

More details, please contact Coilcore directly.