Power Semiconductor Module Dead-Time Calibration Using TSEP
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Solution Overview
Problem
Existing power converter technologies rely on fixed dead-time values that are not specific to individual switches and operating conditions, leading to inefficiencies and reliability issues due to cross-conduction or conduction losses.
Innovation Solution
A method for adjusting dead-time in power semiconductor modules by monitoring operating parameters and temperature-sensitive electrical parameters, allowing for real-time calibration based on actual conditions without the need for absolute calibration of these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dead-time is fixed to a constant over-estimated value, then cross-conduction and hard turn-on switching are prevented, but conduction losses through body-diode and switching losses due to diode reverse recovery increase
Solution Approach 1:
The patent implements dynamic dead-time adjustment by continuously monitoring temperature-sensitive electrical parameters and adapting the dead-time value in real-time operation. This replaces the static over-estimated dead-time with a dynamic value that optimizes performance across different operating conditions, reducing both conduction losses and switching losses while maintaining reliability.
Solution Approach 2:
The patent changes the dead-time parameter based on temperature-sensitive electrical parameter measurements. By monitoring how these parameters vary with temperature and operating conditions, the system adjusts the dead-time parameter to maintain optimal values across different thermal states, preventing both excessive dead-time losses and insufficient dead-time protection.
2Loss of energy
If dead-time is reduced to optimize efficiency, then conduction losses decrease, but cross-conduction and hard turn-on switching risks increase
Solution Approach 1:
The patent employs feedback control by continuously measuring temperature-sensitive electrical parameters and using these measurements to adjust the dead-time value. This closed-loop approach ensures that dead-time is reduced only when measurements confirm safe operating conditions, preventing cross-conduction while optimizing efficiency. The feedback mechanism allows the system to adaptively find the optimal dead-time boundary.
3Loss of energy
If dead-time is dynamically adjusted based on body-diode conduction state detection, then optimal efficiency can be achieved, but complex and costly sensors are required
Solution Approach 1:
The patent enables the power semiconductor module to self-diagnose and self-adjust by utilizing temperature-sensitive electrical parameters that are inherently present in the module's operation. Instead of requiring external sensors to detect body-diode conduction state, the module uses its own electrical parameter variations with temperature to determine optimal dead-time, achieving dynamic optimization without additional complex sensing infrastructure.
Solution Approach 2:
The patent uses temperature-sensitive electrical parameters as intermediary indicators that correlate with both temperature and optimal dead-time requirements. These parameters serve as mediators between the physical thermal state and the control system, allowing indirect but accurate determination of optimal dead-time settings without requiring direct measurement of body-diode conduction state or temperature.
4Loss of energy
If dead-time is adjusted based on computational analysis of converter performances, then efficiency optimization is possible, but high computational requirements and model dependencies arise
Solution Approach 1:
The patent replaces complex computational performance analysis with simple, direct measurements of temperature-sensitive electrical parameters. Instead of requiring sophisticated models and extensive computations to evaluate converter performance, the system uses straightforward parameter monitoring that provides immediate guidance for dead-time adjustment, significantly reducing computational burden while maintaining optimization effectiveness.
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
This approach reduces losses and enhances efficiency and reliability by optimizing dead-time settings based on real-time conditions, reducing computational requirements and production time.
Implementation Method 1
measuring a first temperature sensitive electrical parameter... measuring a second temperature sensitive electrical parameter
Data Source
AI summary
Provided is a method to control a power semiconductor module comprising monitoring at least one operating parameter, and only if the operating parameter is kept into a range and the operating parameter's range has an initial status, initiate a calibration stage. The calibration stage is including measuring a first temperature sensitive electrical parameter, decreasing the dead-time, monitoring said operating parameter, measuring a second temperature sensitive electrical parameter, only if the operating parameter has been kept into said range and the value of the second temperature sensitive electrical parameter corresponds to a lower value of the temperature, assigning the value of the dead-time, else only if the operating parameter has been kept into the range and the value of the second temperature sensitive electrical parameter corresponds to a higher value of the temperature, updating the status, storing the dead-time with the operating parameter's range.