Integrated Gate Threshold Measurement for Power Transistor Degradation
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Solution Overview
Problem
The degradation of gate oxide in power transistors due to thermal cycling leads to a change in gate threshold voltage, which is indicative of device degradation and potential failure, and existing methods struggle to monitor these characteristics within higher-level application circuits.
Innovation Solution
A measurement circuit is integrated within the power application circuit to measure the gate threshold voltage and on-state drain-to-source voltage of transistors, allowing for continuous monitoring and comparison against expected values to detect degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power transistor is used in high-power applications with thermal cycling, then the transistor can perform required power electronics functions, but the gate oxide degrades and gate threshold voltage changes indicating device failure
Solution Approach 1:
The measurement circuit performs preliminary detection of gate threshold voltage before failure occurs. By continuously monitoring the gate threshold voltage during operation, the system can detect degradation trends and predict potential failures before they happen, allowing for preventive maintenance or replacement.
Solution Approach 2:
The system implements feedback by comparing the measured gate threshold voltage against expected values stored in memory. When the measured value deviates from the expected range, the system generates an indication of potential failure, creating a closed-loop monitoring system that provides real-time reliability feedback.
2Reliability
If measurement circuit is integrated within the power application circuit, then continuous monitoring of transistor health is enabled, but the device complexity increases
Solution Approach 1:
The measurement circuit is merged with the existing power application circuit by utilizing available circuit nodes (gate, drain, source) and integrating the measurement functionality within the same system. This approach enables monitoring without adding completely separate external test equipment, thereby reducing overall system complexity.
Solution Approach 2:
The measurement circuit is designed to be universal by using standard circuit components and configurations that can monitor multiple power transistors. The same measurement approach can be applied to different transistor types and circuit topologies, making the solution broadly applicable and reducing the need for specialized custom circuits.
Data Source
AI summary
A measurement circuit is disclosed. The measurement circuit may include a current source configured to provide a current to a drain terminal of a transistor. The measurement circuit may also include a voltage-measure circuit configured to measure a drain-to-source voltage of the transistor. The measurement circuit may further include a regulator circuit. The regulator circuit may be configured to receive from the voltage-measure circuit a voltage-measure signal indicative of the drain-to-source voltage of the transistor, and to regulate the gate-to-source voltage of the transistor based on the drain-to-source voltage of the transistor.