Abstract
This paper analyzes the placement of giant magnetoresistive (GMR) field detectors in power electronic modules. GMR field detectors can provide simultaneous high-bandwidth (dc to megahertz) current and temperature measurements in a small area (1.26 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\hbox{mm}^{2}$</tex></formula> ). The GMR detects incident magnetic fields, and because the spatial magnetic field from current-carrying conductors is dependent on frequency, a precise 5 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\%$</tex></formula> flat-bandwidth (FBW) metric is used to evaluate the placement of the GMR detectors. One significant contribution of this paper is to identify the effects of a conducting material near a current-carrying conductor on the FBW performance and to propose a methodology to achieve high FBW performance inside a power electronics module where the conducting material is near the current-carrying conductor. This paper also introduces a method using multiple GMR detectors to reduce the placement tolerances of the GMR detectors.
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