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" Multi-dimensional Point Magnetic Field Detection as the Basis for Integrated Current Sensing in Power Electronics "
Alvi, Muhammad H.
Jahns, Thomas M.
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Latin Dissertation
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English
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| Record Number
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1053345
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| Doc. No
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TL52462
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| Main Entry
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Alvi, Muhammad H.
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| Title & Author
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Multi-dimensional Point Magnetic Field Detection as the Basis for Integrated Current Sensing in Power Electronics\ Alvi, Muhammad H.Jahns, Thomas M.
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| College
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The University of Wisconsin - Madison
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| Date
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2020
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| Degree
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Ph.D.
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2020
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| Note
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381 p.
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| Abstract
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Increased power density and efficiency in power electronic systems require more compact and low-power current sensing. During recent years, strides have been made in utilizing 1-D Magnetoresistive (MR) Point Field Detector (PFD) array-based current sensing which is economical, compact, galvanically-isolated, and low in power consumption. However, PFD-based multiphase current sensing requires custom-designed conductors and precisely positioned PFDs which are vulnerable to disturbances caused by other nearby field sources. The objective of this research is to develop methodologies to integrate multi-dimensional PFD-based current sensing into high-density Si and SiC power modules, three-phase busbars, and cables. Detecting the 2-D and 3-D spatial magnetic fields reduces the need for PFD arrays by providing the degrees of freedom via the field components in orthogonal dimensions. However, this multi-dimensional magnetic field in power-dense environments with multiple currents is highly cross-coupled and experiences frequency-dependent variations due to skin and proximity effects. A multi-dimensional field decoupling methodology is developed to extract current information from cross-coupled magnetic field vectors in three-phase systems. This method, developed analytically, is demonstrated via simulation as well as experimentally to decouple and sense three-phase currents with <5% RMS error in power module leadframes, cables, and busbars using a single millimeter-scale 3-D MR PFD. Physics-based and neural network-based techniques have also been developed to reject and decouple disturbance fields from external sources. Methodologies have also been developed to shape and analyze the multi-dimensional magnetic fields and to position PFDs for high-bandwidth current sensing. Conductor designs and the use of the spatial vector fields is shown to enhance the current sensing bandwidth. Experimental tests of busbar current sensing using this approach have resulted in measured increases of the 5% bandwidth from under 500Hz to over 65kHz. The research also focuses on integrating the 2-D and 3-D MR PFDs for multiphase current sensing into Si and SiC power modules. Field shaping inside power modules has been evaluated for integrated current sensing, and power module design guidelines have been established to enhance the multi-dimensional field shaping to achieve higher measurement bandwidths. These design guidelines address the interconnects, terminals, and baseplate and have been shown to have a negligible impact on the electrical or thermal parasitic characteristics of the power modules. Experimental evaluation of the SiC power module leadframe design has demonstrated 5% bandwidths of over 100kHz.
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Electrical engineering
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Mechanical engineering
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Jahns, Thomas M.
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The University of Wisconsin - Madison
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