Inverter Switching Element Temperature Estimation via Linearized Voltage
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Solution Overview
Problem
Existing methods for estimating the temperature of switching elements in inverters require complex calculations and large memory storage due to non-linear parameter variations with temperature, leading to increased data storage and computational complexity.
Innovation Solution
A parameter determining apparatus and method that linearizes collector-emitter voltage variations with temperature, reducing data storage and simplifying calculations by using a first-order function to estimate temperature, thereby eliminating the need for storing multiple temperature-specific parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-linear parameter variations with temperature are used for temperature estimation, then measurement precision is improved, but device complexity and memory storage requirements increase
Solution Approach 1:
The patent transforms the non-linear parameter variation into a linear relationship by changing the mathematical form of the equation. Instead of using complex non-linear functions that require extensive computation and memory storage, the invention uses a simplified linear equation that maintains temperature estimation accuracy while significantly reducing computational burden and memory requirements.
Solution Approach 2:
The patent extracts only the essential parameters needed for temperature estimation from the complex non-linear model. By identifying and utilizing only the critical linear relationships, the invention eliminates unnecessary computational steps and memory storage requirements while preserving the core functionality of accurate temperature estimation.
2Measurement precision
If non-linear parameter variations with temperature are used for temperature estimation, then measurement precision is improved, but memory storage capacity increases
Solution Approach 1:
The patent changes the mathematical representation from non-linear to linear form, which dramatically reduces the memory storage capacity required. The linear model requires storing only a few simple parameters whereas the non-linear model would require extensive lookup tables or complex function definitions, thereby reducing memory usage while maintaining estimation precision.
3Measurement precision
If multiple temperature-specific parameters are stored, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal linear equation that can estimate temperature across different conditions without requiring separate parameters for each temperature range. This single linear model serves multiple functions and temperature ranges, eliminating the need for complex multi-parameter storage and conditional computation logic.
Data Source
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AI summary
A parameter determining apparatus for estimating temperature of a switching element of an inverter is disclosed. The parameter determining apparatus of the present disclosure includes an inverter unit (30) including a power semiconductor module configured with at least one or more switching elements, and a control unit (40) configured to determine an initial collector-emitter voltage of each of the switching elements and collector-emitter resistance of each thereof by linearizing a collector-emitter voltage of each of the switching elements at a certain temperature.