Power Switch Aging Protection Using Leakage and Temperature Monitoring
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Solution Overview
Problem
Electronic equipment failures can be unpredictable, leading to uncontrolled shutdowns and resource shortages for quick repairs, which can result in additional issues.
Innovation Solution
A method is introduced to predict the failure of power switches by monitoring parameters such as junction temperature and gate leakage current, and taking action by disabling the corresponding driver to prevent system failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power switches are operated without monitoring, then device complexity is reduced, but reliability deteriorates due to unpredictable failures
Solution Approach 1:
The patent implements preliminary monitoring of gate leakage current and junction temperature to detect aging precursors before actual failure occurs. By measuring these parameters continuously and comparing them against threshold values, the system proactively identifies degradation trends and disables switches before they fail, thereby improving reliability without requiring complex predictive algorithms
Solution Approach 2:
The patent establishes feedback loops that continuously monitor gate leakage current and junction temperature, compare measurements against predefined thresholds, and trigger disable signals when thresholds are exceeded. This closed-loop feedback mechanism enables automatic protection based on simple threshold comparisons rather than complex analysis, resolving the contradiction between reliability improvement and system complexity
2Reliability
If monitoring and disable mechanisms are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the protection system into independent monitoring modules for each power switch, with separate measurements of gate leakage current and junction temperature. Each switch has its own driver circuit that can be independently disabled based on its specific monitoring results. This segmentation allows the system to scale by adding only the necessary monitoring components for each additional switch without creating complex interdependencies
Solution Approach 2:
The patent introduces intermediate threshold comparison circuits that simplify the decision-making process. Instead of directly analyzing complex degradation patterns, the system uses threshold values as intermediaries to convert continuous physical measurements (gate leakage current, junction temperature) into binary go/no-go decisions. These threshold intermediaries absorb the complexity of failure mode analysis while presenting simple enable/disable control signals to the power switches
3Measurement precision
If gate leakage current is monitored continuously, then detection precision is improved, but energy consumption increases
Solution Approach 1:
The patent leverages the existing gate driver circuitry to provide the monitoring function. The same circuit that drives the power switch gate is used to measure gate leakage current by monitoring the current flow when the switch is in the off state. This self-service approach eliminates the need for separate high-power measurement instruments, achieving precise gate leakage detection while minimizing additional energy consumption
Data Source
AI summary
The present disclosure provides techniques for predicting failure of power switches and taking action based on the predictions. In an example, a method can include controlling the at least two parallel-connected power switches via a first driver and a second driver, the first a second driver responsive to a single command signal, measuring a failure characteristic of a first power switch, and disabling a first driver of the first power switch when the first failure characteristic exceeds a failure precursor threshold.