Payton Planar Magnetics Introduces Line of Low Profile Resonant Inductors

According to Payton Planar Magnetics, the demand for high efficiency low EMI designs, such as resonant topologies, is driving the need for high performance planar inductors to be used in power converters in series with the main transformer. In order for the designer to design a high efficiency high power converter with great EMI performance, a resonant topology must be used. Payton states that it designs Planar transformers with the lowest possible leakage inductance in order to achieve the highest efficiency.

Most resonant topologies do need a small amount of inductance to work properly, so Payton introduced a series of low profile, high efficiency, resonant inductors. The inductor can be positioned on top of the transformer in order to maximize use of the available area. The inductance can vary from 1 to10µH and the current from few amps to 100A. The inductance typically varies ±15% from -40 to 130°C, which provides a very stable resonant point. The dimensions of the 2.5µH/33Amp design pictured below are 70 x65 x 30mm. The power dissipation is less than 15W and the temperature rise is less than 50°C. The transformer pictured below the inductor is a 6.6kW design used in a battery charger.