High-frequency toroidal inductors are key passive components in modern power electronics. They are used for energy storage, current smoothing, and electromagnetic interference (EMI) suppression in high-frequency power converters. They are widely used in data centers, industrial power supplies, telecommunications systems, automotive electronics, renewable energy systems, battery chargers, DC-DC converters, UPS systems, and inverters for energy storage systems.
With the increasing use of wide-bandgap semiconductors such as Silicon carbide (SiC) and Gallium nitride (GaN) The switching frequencies and power density of modern power electronics are continuously increasing. As a result, inductors must simultaneously ensure higher efficiency, improved thermal management, and reduced electromagnetic interference—while taking up as little space as possible.
The Bel Fuse SHFWT Series It meets these requirements with a compact, low-profile design, high current-carrying capacity, and reliable operation over a wide temperature range.
Image source: Bel Fuse (Bel Fuse is cited as a current industry example. Bel Fuse has no business or organizational ties to TGM.)
The technology
The SHFWT Series uses a flat copper conductor wound in a spiral around a toroidal magnetic core instead of conventional round-wire windings.
The flat-wire geometry allows for more turns to be incorporated within a single winding layer. This significantly reduces the capacitance between the windings, as well as skin and proximity effects, which occur particularly at high frequencies.
The result is lower alternating current resistance (AC resistance), which reduces electrical losses and heat generation and increases overall efficiency.
When combined with high-quality magnetic core materials, the toroidal design confines the magnetic flux almost entirely within the core. This minimizes magnetic stray fields and electromagnetic interference (EMI), while ensuring stable inductance and excellent performance under DC bias.
In addition, both vertical and horizontal mounting options increase design flexibility for compact electronic assemblies.
The lightweight construction aspect
From a lightweight design perspective, high-frequency toroidal inductors primarily enable a Weight Reduction at the System Level, rather than simply reducing the weight of the individual component.
Thanks to their higher efficiency and excellent thermal properties, power losses are reduced. As a result, heat sinks, cooling systems, and housing structures can be designed to be smaller and lighter.
The flat design with high power density also reduces the required printed circuit board (PCB) area and packaging volume, thereby contributing to lighter electronic modules.
In addition, improved EMI suppression reduces the need for additional shielding materials and filter components. At the same time, higher switching frequencies allow for the use of smaller passive components throughout the power converter.
Together, these advantages contribute to the development of more compact, lighter, and higher-power-density electrical systems without compromising reliability or performance.
Read the full article here: https://www.belfuse.com/resources/news/signal-shfwt-series-delivers-superior-efficiency-thermal-performance-and-low-emi-noise-in-high-frequency-toroidal-inductors?
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