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<p>To reduce the volume of the on-chip integrated magnetic components for fully integrated voltage regulators, two approaches can be considered: increasing the operating frequency to reduce the inductance requirement, and utilizing high permeability soft magnetic thin films to effectively increase the inductance density. Hence, the accurate measurement of thin-film magnetic core losses at high frequencies is essential for the effective analysis and design of such on-chip magnetic components. However, the classical dual-winding method using toroidal core transformers encounters various challenges when measuring the losses in thin-film magnetic cores at high frequencies, such as the phase discrepancies inherent in high-frequency core loss measurement systems, the increasing air-core coupling effect, the non-ideal coupling due to the leakage inductance, etc. To address these issues, this paper comprehensively investigates the impacts of phase discrepancies, air-core coupling effect, and leakage inductance on the measurement accuracy of high-frequency thin-film magnetic core losses, proposing an effective error elimination method for the aforementioned factors.</p>

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An effective approach for thin-film magnetic core loss characterization at high frequencies

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Yang Feng,
  • Lei Liu,
  • Bo Wu,
  • Xiaoyu Li,
  • Chengle Xue,
  • Zhengmin Zhang,
  • Tingcong Ye,
  • Ningning Wang

摘要

To reduce the volume of the on-chip integrated magnetic components for fully integrated voltage regulators, two approaches can be considered: increasing the operating frequency to reduce the inductance requirement, and utilizing high permeability soft magnetic thin films to effectively increase the inductance density. Hence, the accurate measurement of thin-film magnetic core losses at high frequencies is essential for the effective analysis and design of such on-chip magnetic components. However, the classical dual-winding method using toroidal core transformers encounters various challenges when measuring the losses in thin-film magnetic cores at high frequencies, such as the phase discrepancies inherent in high-frequency core loss measurement systems, the increasing air-core coupling effect, the non-ideal coupling due to the leakage inductance, etc. To address these issues, this paper comprehensively investigates the impacts of phase discrepancies, air-core coupling effect, and leakage inductance on the measurement accuracy of high-frequency thin-film magnetic core losses, proposing an effective error elimination method for the aforementioned factors.