New Core Loss Measurement Method for High-Frequency Magnetic Materials

Abstract

Magnetic core loss is an important concern for power converters. As the switching frequency increases and converter size reduced, the core loss will have significant impact to the converter efficiency and temperature. Accurate evaluation is important for magnetic design and converter loss estimation. The classic two-winding method is limited to low frequencies (usually below 1 MHz) because it is sensitive to phase discrepancy. In this paper, a new method is proposed for high-frequency core loss measurement that utilizes capacitive cancellation, which is suitable for HF and VHF core loss measurement. The new method greatly reduces the sensitivity to phase discrepancy, which is the dominating error source in the conventional two-winding method. An experimental demonstration is performed at 10 MHz, and the possible errors are analyzed in detail. With the proposed method, the high-frequency core loss can be accurately measured.Index Terms-Core loss measurement, ferrite, high frequency, magnetic integration, magnetic loss.

Nanocrystalline Powder Cores for High-Power High-Frequency Applications

“…The inductor core should have high saturation flux density in accordance with low permeability to accommodate high current [27,28]. Although high permeability is beneficial in terms of increasing the inductance value, the core can saturate with lower current, which limits the power rating of the inductor.…”

Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly

“…The Langevin theory of paramagnetism can be applied to superparamagnetism by replacing the atomic magnetic moment with the magnetic moment of the NP (superspin). 20,21 Figure 5(b) shows a magnetization curve estimated by substituting T = 300 K, k B = 1.38×10 -23 J/K and the superspin moment of the 4.3 nm diameter Fe NP (Table II) into Equation (2). The initial susceptibility of the FNA obtained experimentally, shown in Fig.…”

Yük Altında Çalışan Tek-Fazlı Transformatörlerin Demir ve Bakır Kayıplarının İzlenmesi

“…Fakat ölçülen bu kaybın ne kadarının demir kayıplarına ve ne kadarının bakır kayıplarına ait olduğunu doğrudan hesaplayabilecek bir yöntem bulunmamaktadır. Söz konusu kayıpları ayrı ayrı elde etmek için mevcut olan bazı ölçüm yöntemleri [7][8][9] transformatörün bağlı olduğu sistemden ayrılmasını gerektirirken bazıları da [10][11][12] çok sayıda transformatör parametresi kullandığından güvenilir değildir. Bazı ölçüm yöntemleri [13,14]…”