Magnetics are the most critical components of power electronics design.
A good sizing of magnetics in any power electronics systems is one of the most important things to decrease losses and increase efficiency.
Magnetic losses are composed of copper and iron losses. By a good understanding of these types of losses, Watt & Well has succeeded in conducting a thorough study of these types in order to reduce them. Indeed, by playing on a multitude of parameters (shapes, material, type of winding, type of wire, frequency, magnetic field ...) and a computational study, Watt & Well is able to reduce them, whether it is due to the resistivity, the skin effect, proximity effect or core losses.
Understanding of the Skin Effect & Proximity effect
When a high-frequency alternating current passes through a conductor, a magnetic field is created inside and outside of the conductor. When this magnetic field becomes too high, it will change the distribution of the current inside the conductor. This is why the current will focus on the periphery of it. The surface used by the current is then reduced, which increases significantly the resistance of the material and therefore increases the losses.
This effect occurs when 2 conductors are close and have the same current direction: the magnetic field specific to each one interacts between them. We can see on the picture (from FEMM) that the magnetic field between them is canceled and so the current will focus on the extremity.
The wiring, winding & core compromise
By multiple calculation study and simulation (LTSpice, FEMM4.2), Watt & Well determines the best way to size the magnetics to increase efficiency by following the application.
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