IGBT Transient Modeling via Piece-Wise Line Functions
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Solution Overview
Problem
Conventional IGBT models face challenges in accurately simulating transient characteristics and rely heavily on experimental parameter extraction, which is complex and less adaptable to different working conditions.
Innovation Solution
A piece-wise line modeling method is developed to describe the collector-emitter voltage, collector current, and gate-emitter voltage of IGBTs during switching-on and switching-off transients, dividing these processes into specific periods and using linear or exponential functions, with parameters obtained from datasheets, allowing for accurate representation of transient characteristics without needing to model the commutation diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analytical models are used to accurately simulate IGBT transient characteristics, then simulation accuracy is improved, but model complexity and computation burden increase
Solution Approach 1:
The switching transient process is divided into multiple distinct periods (delay period, rise period, fall period, etc.), and piece-wise linear functions are used to describe the voltage and current characteristics in each period. This segmentation approach simplifies the overall model while maintaining accuracy in capturing transient characteristics.
Solution Approach 2:
The model uses piece-wise linear functions with different parameters for different time periods, allowing the model to adapt to the changing characteristics of the IGBT during switching. The parameters are extracted from datasheet values rather than requiring complex experimental fitting.
2Device complexity
If behavioral models are used to simplify IGBT modeling, then model simplicity is improved, but accuracy and adaptability to different working conditions deteriorate
Solution Approach 1:
The switching transient process is divided into multiple distinct periods (delay period, rise period, fall period, etc.), and piece-wise linear functions are used to describe the voltage and current characteristics in each period. This segmentation approach simplifies the overall model while maintaining accuracy in capturing transient characteristics.
Solution Approach 2:
The model uses piece-wise linear functions with different parameters for different time periods, allowing the model to adapt to the changing characteristics of the IGBT during switching. The parameters are extracted from datasheet values rather than requiring complex experimental fitting.
3Measurement precision
If conventional analytical models are used, then simulation accuracy is improved, but parameter extraction complexity and convergence difficulty increase
Solution Approach 1:
The model replicates the IGBT switching characteristics using piece-wise linear functions that mirror the actual voltage and current waveforms during switching. This copying approach allows accurate simulation without requiring complex parameter extraction from experiments.
Solution Approach 2:
The model uses datasheet values directly as parameters, allowing the IGBT device to essentially model itself without requiring external experimental measurement or complex parameter extraction procedures. The datasheet provides all necessary parameters for the piece-wise linear model.
Data Source
AI summary
An IGBT modeling method includes creating piece-wise line functions describing a collector-emitter voltage vce, a collector current ic and a gate-emitter voltage vge of the IGBT during a switching-on transient based on an internal structure of the IGBT and transient processes of the IGBT. The IGBT modeling method further includes creating piece-wise line functions describing the collector-emitter voltage vce, the collector current ic and the gate-emitter voltage vge of the IGBT during a switching-off transient based on the internal structure of the IGBT and the transient processes.