TY - JOUR
T1 - Improved Current Shunt Characterization Method for Core Loss Measurement
AU - Huang, Anfeng
AU - Wang, Xu
AU - Zhang, Hanyu
AU - Hwang, Chulsoon
AU - Pommerenke, David
AU - Fan, Jun
PY - 2022/7/1
Y1 - 2022/7/1
N2 - With the increasing switching frequencies and power densities in modern power converters, magnetic core losses are becoming more essential for efficiency and thermal optimization. Traditionally, the two-winding method suffers from sensitivity to phase error in practical measurements; this is mainly created by the unknown phase shift of a current-sensing resistor. Several methods have been developed to characterize the phase shift of a current shunt resistor; however, the load effects of oscilloscopes are ignored. As a result, the corresponding phase shift can be significantly underestimated. This article proposes an improved method for phase shift extraction of a current shunt to solve the problem. The effectiveness of the shunt characterization method is experimentally verified up to 50 MHz. Benefits from the proposed method, the time-consuming component tuning process is not required for core loss measurement. A measurement verification at 10 MHz shows its validity. Finally, a current shunt implemented with a coaxial resistor array is designed with a phase shift of 0.05$^\circ$ at 10 MHz and a parasitic inductance as low as 42 pH.
AB - With the increasing switching frequencies and power densities in modern power converters, magnetic core losses are becoming more essential for efficiency and thermal optimization. Traditionally, the two-winding method suffers from sensitivity to phase error in practical measurements; this is mainly created by the unknown phase shift of a current-sensing resistor. Several methods have been developed to characterize the phase shift of a current shunt resistor; however, the load effects of oscilloscopes are ignored. As a result, the corresponding phase shift can be significantly underestimated. This article proposes an improved method for phase shift extraction of a current shunt to solve the problem. The effectiveness of the shunt characterization method is experimentally verified up to 50 MHz. Benefits from the proposed method, the time-consuming component tuning process is not required for core loss measurement. A measurement verification at 10 MHz shows its validity. Finally, a current shunt implemented with a coaxial resistor array is designed with a phase shift of 0.05$^\circ$ at 10 MHz and a parasitic inductance as low as 42 pH.
KW - Resistors
KW - Current measurement
KW - Impedance
KW - Loss measurement
KW - Core loss
KW - Transmission line measurements
KW - Voltage measurement
UR - https://ieeexplore.ieee.org/document/9709677/
U2 - 10.1109/TPEL.2022.3150003
DO - 10.1109/TPEL.2022.3150003
M3 - Article
SN - 1941-0107
VL - 37
SP - 8290
EP - 8300
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 7
M1 - 9709677
ER -