Power Module Leakage Current Protection Circuit
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Solution Overview
Problem
High electron mobility transistors (HEMTs) experience gate leakage currents, which existing solutions often address by modifying the manufacturing process or device structure, but these solutions are not effective in preventing leakage currents from reaching critical levels, affecting the reliability and stability of power device operation.
Innovation Solution
A power module with a periphery circuit that includes a leakage current detection circuit using NMOS and PMOS transistors and a comparator to detect and control gate leakage currents, generating a control signal to stop the power device operation when the leakage current exceeds a critical value, thereby protecting the power device and maintaining stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If manufacturing process or device structure is modified to reduce leakage current, then leakage current is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a separate leakage current detection circuit as an intermediary component that monitors gate leakage current and triggers protection mechanisms. This external monitoring approach avoids the need to modify the power device structure itself, thereby reducing leakage current effects without increasing device structural complexity.
Solution Approach 2:
The protection function is segmented into a separate detection circuit module that operates independently from the power device. The detection circuit includes separate components (resistors, comparators, transistors) that work together to monitor and protect against leakage current, allowing the power device structure to remain simple while adding protection functionality.
2Object-generated harmful factors
If manufacturing process is modified to reduce leakage current, then leakage current is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The detection circuit acts as an intermediary that compensates for manufacturing variations. By monitoring the actual leakage current and triggering protection when thresholds are exceeded, the system becomes tolerant of manufacturing process variations without requiring extremely precise manufacturing control.
Solution Approach 2:
The detection circuit provides feedback about the actual leakage current status to the control system. This feedback mechanism allows the system to adapt to manufacturing variations and maintain reliable operation even when manufacturing precision varies, as the protection triggers based on actual measured conditions rather than assumed manufacturing tolerances.
3Reliability
If leakage current detection circuit is added, then leakage current protection is improved, but device complexity increases
Solution Approach 1:
The detection circuit is implemented as a separate intermediary module with clearly defined monitoring and protection functions. This modular approach isolates the complexity of the protection logic from the power device itself, making the overall system more manageable and maintainable while improving reliability.
Solution Approach 2:
The detection circuit automatically monitors leakage current and triggers protection mechanisms without requiring external intervention. The circuit self-regulates by comparing measured leakage current against reference thresholds and automatically activating protection when needed, reducing the need for complex external control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses gate leakage currents, enhancing the reliability and stability of power device operation by detecting and managing leakage currents, ensuring the power device and module operate within safe parameters.
Implementation Method 1
a comparator... configured to compare a voltage level at a gate of the power device with a reference voltage level
Data Source
AI summary
A power module including a power device and a periphery circuit configured to suppress a leakage current in the power device. The periphery circuit includes a leakage current detection circuit configured to detect a leakage current from the power device and control operation of the power device based on a result of the detection. The leakage current detection circuit including an input terminal connected to the power device, a plurality of NMOS transistors, a plurality of PMOS transistors connected to the plurality of NMOS transistors, and a comparator.