A kind of in-situ monitoring system for aging state of power device based on shell temperature
By using a case temperature-based monitoring system, a two-dimensional cell vector is formed by the difference in case temperature waveforms and logarithmic processing, and the cosine similarity parameter is calculated. This solves the problems of complexity and accuracy in monitoring the aging status of power devices in the prior art, and realizes non-invasive online monitoring and early warning functions.
CN117907722BActive Publication Date: 2026-06-02ZHEJIANG UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG UNIV
- Filing Date
- 2024-01-22
- Publication Date
- 2026-06-02
Smart Images
Figure CN117907722B_ABST
Abstract
The application discloses a kind of power device aging state in situ monitoring system based on shell temperature, the shell temperature measurement system is connected with power device aging test module, the power device aging test module includes current source I d , measured power device Q1 and driving voltage source V GS ; the one end of the current source I d is connected with the drain of measured power device Q1, the other end of the current source I d is connected with the cathode of driving voltage source V GS And the source of measured power device Q1 are connected and grounded;The gate of measured power device Q1 is connected with the anode of driving voltage source V GS ;The shell temperature measurement system includes thermal resistance R T And shell temperature measurement and data acquisition system.The application can not only utilize shell temperature in situ online characterization power device aging trend, but also can be characterized in situ online power device wire bonding and solder layer serious aging state under the premise of not affecting power device work.
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