Gate Drive Signal Monitoring for Power Module Aging Prediction
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Solution Overview
Problem
Current systems lack the capability to effectively monitor aging effects in semi-conductor devices, such as IGBTs and MOSFETs, leading to unexpected failures due to lack of prognostic health monitoring, which could alert users when the devices are nearing the end of their life.
Innovation Solution
A monitoring circuit is integrated with the gate drive board to monitor critical signals, including turn-on voltage and charge current, to predict the failure time of semi-conductor devices, and communicate with a central maintenance computer for timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current sensor is used for control and monitoring current through the semi-conductor device, then current control is achieved, but the resolution required to see aging changes is not provided
Solution Approach 1:
The patent uses the gate drive board as an intermediary component that already has access to critical signals (gate voltage, gate current) needed for aging detection. By adding a monitoring circuit to this existing intermediary, the solution achieves high-resolution aging detection without requiring separate complex measurement systems, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The monitoring circuit is designed to perform multiple functions: it monitors gate voltage, gate current, and derives aging indicators from these measurements. This multi-functional approach allows the system to achieve high measurement precision for aging detection while avoiding the need for multiple separate sensors, thereby controlling device complexity
2Reliability
If no monitoring is implemented, then device complexity is low, but prognostic health monitoring capability is absent
Solution Approach 1:
The patent merges the monitoring function with the existing gate drive board by integrating a monitoring circuit that shares the same physical platform and power supply. This combination achieves reliable prognostic health monitoring while minimizing additional device complexity by reusing existing components and infrastructure rather than adding completely separate monitoring systems
Solution Approach 2:
The monitoring circuit utilizes signals already present in the gate drive board (gate voltage and gate current) to perform aging detection. This self-service approach allows the system to achieve reliable health monitoring without requiring external sensors or additional measurement infrastructure, thereby limiting the increase in device complexity
Data Source
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AI summary
A system is provided. The system includes a semi-conductor device and a gate drive board. The gate drive board (210) provides a voltage to the semi-conductor device. The system also includes a controller (205) and a monitoring circuit. The controller (205) drives the voltage provided by the gate drive board 210). The monitoring circuit (230) is coupled to the gate drive board to monitor operations of the controller and the semi-conductor device.