Segmented Temperature Detection for Power Semiconductor Junctions
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Solution Overview
Problem
Existing temperature detection devices for power semiconductor switching elements in power conversion systems have limited accuracy, particularly in high-temperature ranges, due to their linear temperature detection characteristics, which restricts the ability to accurately protect these elements from overheating and optimize power conversion performance.
Innovation Solution
A temperature detection device with a configuration that includes multiple operational amplifiers with different resistance ratios, allowing for varying temperature slopes, enabling more precise temperature detection by adjusting output voltages based on the operation junction temperature, thereby improving detection accuracy and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a linear temperature detection characteristic is used, then the device complexity is reduced, but the measurement precision deteriorates in high-temperature ranges
Solution Approach 1:
The temperature detection range is divided into multiple segments with different linear characteristics. The patent uses multiple operational amplifiers (first and second operational amplifiers) with different resistance ratios to create separate linear detection segments. Each operational amplifier handles a specific temperature range with optimized precision for that segment, resolving the contradiction by making the detection system piecewise linear rather than purely linear.
Solution Approach 2:
The patent dynamically switches between different operational amplifiers based on the detected temperature range. A temperature detection unit determines which operational amplifier to activate, allowing the system to adapt its detection characteristics to the current temperature conditions. This dynamic switching enables high precision across the entire temperature range while maintaining manageable device complexity through controlled selection of detection paths.
2Measurement precision
If multiple operational amplifiers with different resistance ratios are used, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple operational amplifiers, each responsible for a specific temperature range with optimized resistance ratios. This segmentation allows each component to be simpler and more precise for its designated range, while the overall system achieves comprehensive high-temperature detection accuracy through the combination of segmented detection paths.
Solution Approach 2:
A temperature detection unit acts as an intermediary that selects which operational amplifier to use based on the current temperature conditions. This intermediary component manages the complexity by intelligently routing the detection signal through the appropriate operational amplifier, reducing the need for complex simultaneous processing of all detection paths and simplifying the overall control logic.
3Measurement precision
If the temperature detection accuracy is improved, then the temperature margin is increased, but the detection range coverage becomes more difficult
Solution Approach 1:
The system dynamically adapts its detection characteristics by switching between different operational amplifiers based on the temperature range being measured. This dynamic adaptation allows the system to maintain high detection accuracy across the entire temperature spectrum, from low to high temperatures, by selecting the operational amplifier with the optimal resistance ratio for each specific range.
Solution Approach 2:
The temperature detection device achieves multi-functionality by incorporating multiple operational amplifiers that can handle different temperature ranges. Each operational amplifier is configured with specific resistance ratios to optimize detection for particular ranges, making the overall system universal enough to cover the complete temperature spectrum while maintaining high precision through the coordinated operation of its multi-functional components.
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 solution enhances the accuracy of temperature detection, allowing for a wider temperature margin during high-temperature operations, improving the output capacity of power conversion devices and providing more effective protection against overheating, with a 10% increase in the operation junction temperature margin and potential 10% increase in output power capacity.
Implementation Method 1
a voltage signal Vf from the diode D which is a signal representing the temperature (operation junction temperature) of a power semiconductor switching element, has a negative temperature coefficient
Data Source
AI summary
A temperature detection device which receives a temperature signal from a temperature sensor and outputs an electrical signal corresponding to the temperature signal. A temperature slope which is an amount of change in an output of the electric signal relative to an amount of change in the temperature signal is changed at a predetermined temperature threshold.