Thermal Protection Circuit for Electronic Switches
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Solution Overview
Problem
Existing electronic switches, such as MOSFETs and IGBTs, face overheating issues due to increased power dissipation during short circuits, which can lead to damage, and current temperature protection methods are inadequate in effectively managing this risk.
Innovation Solution
An electronic circuit with a thermal protection circuit that includes temperature sensors and a propagation detection mechanism to switch off the electronic switch when the temperature at a specific position exceeds a threshold, adjusted based on detected temperature propagation, thereby preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic switch is used to switch electrical loads, then the switching function is achieved, but the electronic switch is susceptible to overheating and damage during short circuits
Solution Approach 1:
The patent implements preliminary thermal protection by detecting temperature propagation trends before the electronic switch reaches dangerous temperature levels. The system monitors temperature at multiple positions and predicts future temperature states, allowing the control unit to switch off the electronic switch proactively before overheating damage occurs, rather than waiting for critical temperature thresholds to be exceeded
Solution Approach 2:
The patent applies dynamic temperature threshold adjustment based on detected temperature propagation. Instead of using fixed temperature thresholds, the system adapts the threshold dynamically according to the measured temperature propagation characteristics. When temperature propagation is detected, the threshold is adjusted to account for thermal inertia, allowing the system to maintain reliable operation while preventing overheating damage
2Measurement precision
If a fixed temperature threshold is used for protection, then the protection logic is simple, but the protection accuracy is insufficient due to thermal inertia
Solution Approach 1:
The patent implements dynamic adjustment of the temperature threshold based on detected temperature propagation. The control unit modifies the threshold value according to the measured propagation characteristics, making the protection system adaptive rather than static. This dynamic approach improves protection accuracy by accounting for thermal inertia while maintaining reasonable circuit complexity through systematic threshold adjustment
Solution Approach 2:
The system performs preliminary detection of temperature propagation to predict future temperature states before critical thresholds are reached. By detecting propagation trends in advance and adjusting thresholds proactively, the system achieves higher measurement precision for protection decisions without requiring overly complex real-time intervention mechanisms
3Measurement precision
If temperature sensors are placed at multiple positions, then the temperature detection coverage is improved, but the device complexity increases
Solution Approach 1:
The patent divides the temperature monitoring function into multiple sensor positions within the semiconductor body. By placing sensors at strategically selected positions, the system captures temperature distribution and propagation characteristics more accurately. This segmentation of the monitoring function improves detection precision while keeping each individual sensor simple, with the complexity managed through coordinated evaluation of multiple sensor signals
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
Effectively protects electronic switches from overheating by accurately detecting temperature propagation and switching off the switch before damage occurs, enhancing their reliability and longevity.
Implementation Method 1
a first temperature sensor (5) having a first sensor element located at a first position (P1) on the semiconductor body, where the first temperature sensor is configured to provide a first temperature signal that is representative of a temperature at the first position
Implementation Method 2
a temperature propagation detection circuit that is configured to detect a temperature propagation in the semiconductor body
Data Source
AI summary
A method can be used for driving an electronic switch integrated in a semiconductor body. A first temperature is measured at a first position of the semiconductor body. A temperature propagation is detected in the semiconductor body. The electronic switch is switched off when the temperature at the first position rises above a first threshold that is set dependent on the detected temperature propagation.