Electronic systems such as electronic controls, onboard computers, communications, navigation, and radar perform many critical functions onboard military and commercial aircraft. All of these systems depend on electrical power supplies for direct current (DC) power at a constant (regulated) voltage to drive solid-state electronics. With these power supplies playing an important role in the operation of aircraft systems and subsystems, flight and ground crews need health state awareness and prediction tools that diagnose faults accurately, predict failures, and project life remaining of these components.An integrated approach to switching mode power supply health management was developed that implements techniques from engineering disciplines including statistical reliability modeling, damage accumulation models, physics of failure modeling, and sensor-based condition monitoring using automated reasoning algorithms. Using model-based assessments in the absence of fault indications, and updating the model-based assessments with sensed information when it becomes available, provides health state awareness at any point in time. The diagnostic techniques, and prognostic models, have been demonstrated through accelerated failure testing of switching mode power supplies.
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