Dynamic Overcurrent Threshold Adjustment for MCU Fault Detection
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Solution Overview
Problem
Conventional overcurrent detection mechanisms in the automotive industry, which rely on static maximum current limits, fail to detect faults or error conditions in microcontroller units (MCUs) operating at reduced current levels, as the overall current flow may still be below the fixed limit.
Innovation Solution
A method and apparatus that dynamically determine an overcurrent value based on the current requirement indication of an electronic device, allowing for real-time adjustment of the overcurrent threshold, enabling detection of excessive current flow even when the MCU is running at a reduced current level, using a power management integrated circuit (PMIC) with an overcurrent detection module and event management module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static maximum current limit is used for overcurrent detection, then the detection mechanism is simple and reliable, but it fails to detect faults when the MCU operates at reduced current levels below the fixed limit
Solution Approach 1:
The patent implements dynamic overcurrent thresholds that automatically adjust based on the MCU's operating mode. The system transitions from static to dynamic threshold detection, allowing the overcurrent limit to vary according to the current operating level, thereby maintaining detection reliability across different power modes
Solution Approach 2:
The invention changes the detection parameter from a fixed current threshold to a variable threshold that adapts to different operating conditions. By modifying the threshold parameter dynamically based on operating mode, the system achieves both reliability and adaptability
2Use of energy by moving object
If the MCU runs at reduced current levels to save power, then energy consumption is reduced, but faults causing extra current flow go undetected by static overcurrent mechanisms
Solution Approach 1:
The system dynamically adjusts the overcurrent detection threshold based on the MCU's operating mode, enabling reliable fault detection even when the MCU operates at reduced current levels for energy savings
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the operating mode and adjust the detection threshold accordingly, creating a closed-loop system that maintains detection capability while allowing energy-efficient operation
Data Source
AI summary
A method of detecting overcurrent events within at least one electronic device, and an overcurrent detection module therefor. The method comprises receiving at least one current requirement indication from at least one electronic device, determining at least one overcurrent value based at least partly on the received at least one current requirement indication, receiving at least one indication of at least one input current flow for the at least one electronic device, and determining that an overcurrent event is occurring if the indicated at least one input current flow for the at least one electronic device exceeds the determined at least one overcurrent value.