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Cold Survivable Current Sense Multi-Chip Module

This paper will present the design of a Current Sense Module (CSM) used to measure motor phase currents that is capable of surviving the harsh ambient environment of ocean worlds, such as Europa and Enceladus. The CSM module is fabricated by i3 Electronics using their Multi-Chip Module (MCM) technology with techniques developed by JPL to allow this module to survive temperatures down to −184°C. This module greatly improves the ability to measure phase and bridge current which can be problematic in extreme environments. In addition, by packaging these electronics at the die level, we achieve significant weight and size savings. This module is one of several modules that employ similar techniques that are integrated into a distributed or centralized motor controller. This paper will discuss the module's design along with a summary of our test results.