Blog – LPema

How to Reduce Proximity Effect and AC Copper Loss in High-Frequency Transformers

This article explains the causes of proximity effect and AC copper loss in high-frequency transformers and provides practical winding design strategies to minimize losses, improve efficiency, and enhance thermal reliability.

Jan 5, 2026

Transformer Winding Techniques for High-Frequency Applications

This article explains transformer winding techniques for high-frequency applications, covering skin effect, proximity effect, litz wire, foil windings, interleaving methods, leakage inductance control, EMI trade-offs, and thermal considerations.

Dec 30, 2025

Advanced Cooling Techniques for High-Frequency Magnetic Components

This engineering guide explores advanced cooling techniques for high-frequency magnetic components. It details strategies for managing both core loss and winding loss, focusing on minimizing thermal resistance ($R_{th}$). Key techniques covered include optimizing conduction through mechanical heat sinks and PCB thermal vias, utilizing high-performance Thermal Interface Materials (TIMs) and conductive potting compounds, and implementing active cooling methods like forced air and liquid immersion for extreme power density. The framework provides actionable advice for matching the cooling strategy to the component's loss profile, ensuring reliability and maximizing component lifespan in compact power converters.

Dec 16, 2025

How to Select Magnetic Core Materials for High-Frequency Transformers

This article serves as a complete technical guide for selecting magnetic core materials for high-frequency transformers in modern power electronics. It offers a detailed engineering comparison of five major material types: Manganese-Zinc Ferrite, Iron Powder, Sendust (FeSiAl), Nanocrystalline, and Amorphous Cores. We analyze their critical performance metrics, including saturation flux density ($B_s$), core loss ($P_v$), permeability stability, and Curie temperature ($T_c$). The guide confirms that while advanced materials are suitable for inductors or low-frequency applications, MnZn ferrite remains the optimal choice for high-frequency isolation transformers operating above 100 kHz due to its lowest AC loss and best performance-to-cost ratio. A practical selection framework is provided to help engineers match core properties to specific power topologies (e.g., LLC, Flyback, PFC).

Dec 12, 2025

PoE Transformer Manufacturer: The Tier-1 OEM Source for Low-Cost PoE Transformer Alternatives

For Procurement Managers and Electronic Engineers, the challenge is always the same: how to maintain Tier-1 reliability while meeting aggressive BOM (Bill of Materials) cost targets? When specifying magnetic components, you often rely on big names like Wurth Elektronik to ensure quality. But are you paying for the component, or are you paying for the brand logo?

Dec 4, 2025