Triple Pulse Test (TPT) for Characterizing Power Loss in Magnetic Components in Analogous to Double Pulse Test (DPT) for Power Electronics Devices

Wang, Jun; Yuan, Xibo

doi:10.1109/iecon43393.2020.9255039

Cited by 15 publications

(28 citation statements)

References 13 publications

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“…To reflect the actual operation in a power converter, a typical rectangular voltage and possibly a dc-bias component needs to be applied to the inductor in the testing. To emulate the waveforms seen in a typical power converter, a half-bridge structure [2], [13], [28] depicted in Fig. 3, is utilized to apply rectangular voltage on the testing circuit and conduct bidirectional current, which has the ability to compensate device voltage drops to provide symmetric rectangular voltages.…”

Section: Experimental Evaluation and Comparison With Existing Approachesmentioning

confidence: 99%

A Novel In-Situ Measurement Method of High-Frequency Winding Loss in Cored Inductors With Immunity Against Phase Discrepancy Error

Wang

Yuan

2021

IEEE Open J. Ind. Electron. Soc.

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Evaluating the high-frequency winding loss accurately is crucial for the design of modern high-frequency power converters. This paper proposes a novel experimental method to accurately measure the in-situ inductor winding loss, which separates out the winding loss from the core loss through the reactive voltage cancellation concept. The proposed in-situ measurement can account for the complete winding loss including impacts from non-ideal field distributions by testing the inductor with the core attached, e.g., the winding edge effect, bypass flux, fringing flux, and the non-linear dynamic behaviour of the core, which cannot be well modelled with the existing analytical or simulation methods. This method has immunity against the probe phase discrepancy error, since it is designed to measure a pair of voltage and current that are in phase. This approach can be considered as the first attempt of applying the reactive voltage cancellation concept in measuring winding loss, while this concept was originally brought up for core loss and applied for core loss measurement only. By performing a Triple Pulse Test (TPT) procedure, the winding losses under practical large signals with dc-bias and rectangular voltage can be evaluated with the proposed testing circuit. The proposed approach is compared and verified against the conventional methods relying on (1) small-signal impedance measurements and FFT analysis (2) in-situ measurement with the two winding method to exclude the core loss. The presented method provides a foundation for the accurate in-situ evaluation of winding loss covering all the large-signal and non-linear effects.

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Section: Experimental Evaluation and Comparison With Existing Approachesmentioning

confidence: 99%

A Novel In-Situ Measurement Method of High-Frequency Winding Loss in Cored Inductors With Immunity Against Phase Discrepancy Error

Wang

Yuan

2021

IEEE Open J. Ind. Electron. Soc.

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“…In the two-winding method, the core loss is obtained by integrating the product of the secondary voltage and the primary current of the CUT, which reflects the area of a closed B-H loop. To excite the CUT, a half-bridge structure proposed in [28][29][30] is utilized in this work, which is shown with the experiment setup in Appendix A. A discontinuous test procedure called triple pulse test (TPT) is applied, which is proposed in [28], [29].…”

Section: A Core Loss Measurementmentioning

confidence: 99%

“…To excite the CUT, a half-bridge structure proposed in [28][29][30] is utilized in this work, which is shown with the experiment setup in Appendix A. A discontinuous test procedure called triple pulse test (TPT) is applied, which is proposed in [28], [29]. The concept of TPT is to test limited cycles only and prevent unnecessary continuous operations.…”

Section: A Core Loss Measurementmentioning

confidence: 99%

“…The specifications of the instruments, inductors and other test rig components are shown in Appendix A. As discussed in [28], [29], the number of required cycles for TPT may differ depending on the CUT. This work used four pulses to stabilize the CUT to reach the steady-state.…”

Section: A Core Loss Measurementmentioning

confidence: 99%

“…To excite the CUT, a half-bridge structure is utilized and depicted in Fig. A1 [28][29][30]. This structure enables the compensation of the asymmetric square voltage caused by the device voltage drops, just by adjusting the output voltages of the two dc power supplies (VDC1 and VDC2).…”

Section: Appendix a Core Loss Measurement And System Specificationsmentioning

confidence: 99%

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A New Method for Offline Compensation of Phase Discrepancy in Measuring the Core Loss With Rectangular Voltage

Wang

Yuan

2021

IEEE Open J. Ind. Electron. Soc.

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Nowadays accurate characterization of the magnetic component losses becomes increasingly important in the design stage of power converters. As the main challenge in characterizing a magnetic component, the core loss is commonly measured through the two winding B-H loop measurement method that is susceptible to the phase discrepancy error, especially for low-permeability, low-loss cores. This paper, therefore, proposes a new offline method to compensate the phase discrepancy error in high-frequency core loss measurement under rectangular voltage excitation. In the post-processing of measured waveforms, the phase discrepancy is compensated by shifting the measured current horizontally to align with a reference phase angle, which is found from an offline impedance sweep on the component-under-test and FFT analysis. As a result, the testing voltage and current waveforms can be measured without considering deskew at the time of measuring. Additionally, this method is more accurate than calibration methods considering a fixed frequency response (e.g., a deskew fixture), because it considers the frequency response across the whole spectrum. The proposed approach can be well applied for typical PWM converters with switching frequencies up to hundreds of kilohertz, for which the effective voltage harmonics extend to a few megahertz range that can be well evaluated with an impedance analyzer. The presented method is experimentally verified against the existing partial cancellation method which is immune to phase discrepancy error.

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Time Domain Analysis for Measuring Core Losses in Inductive Elements for Power Electronics: An Investigation Study

Chojowski,

Baszyński,

Dziadecki

et al. 2023

IEEE Access

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Triple Pulse Test (TPT) for Characterizing Power Loss in Magnetic Components in Analogous to Double Pulse Test (DPT) for Power Electronics Devices

Cited by 15 publications

References 13 publications

A Novel In-Situ Measurement Method of High-Frequency Winding Loss in Cored Inductors With Immunity Against Phase Discrepancy Error

A Novel In-Situ Measurement Method of High-Frequency Winding Loss in Cored Inductors With Immunity Against Phase Discrepancy Error

A New Method for Offline Compensation of Phase Discrepancy in Measuring the Core Loss With Rectangular Voltage

Time Domain Analysis for Measuring Core Losses in Inductive Elements for Power Electronics: An Investigation Study

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