Switch Element Temperature Estimation via Current Loss Analysis
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Solution Overview
Problem
Conventional temperature sensors struggle to accurately detect rapid changes in temperature due to the time it takes for heat to be transmitted from the detection target to the sensor, leading to significant differences between the sensor's reading and the actual target temperature.
Innovation Solution
A temperature detecting apparatus that includes a current detecting unit to monitor the output current from a switch element and a temperature estimating unit to calculate conduction and switching losses, allowing for accurate temperature estimation based on these losses, even during sharp temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is arranged to detect heat transmission through an interposed material, then the sensor can detect the temperature of the detection target, but the detection response time becomes long when the temperature changes sharply
Solution Approach 1:
The patent introduces a heat-conductive sheet as an intermediary substance between the detection target and the temperature sensor. This heat-conductive sheet facilitates faster heat transmission from the detection target to the sensor, thereby reducing the detection response time while maintaining accurate temperature measurement capability.
2Reliability
If heat is transmitted through an interposed material to the temperature sensor, then the sensor can function, but the temperature change detection lags behind the actual temperature change
Solution Approach 1:
The heat-conductive sheet serves as a mediator that accelerates heat transmission between the detection target and the temperature sensor. This intermediary material has high thermal conductivity properties that enable the sensor to track rapid temperature changes more effectively while maintaining reliable detection across various temperature conditions.
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 enables accurate detection of temperature changes in the detection target, ensuring that the estimated temperature closely reflects the actual target temperature, even during rapid changes.
Implementation Method 1
Heat generated from a detection target is transmitted to a temperature sensor through a material interposed between the detection target and the temperature sensor
Implementation Method 2
a current detecting unit that detects an output current from the detection target changing depending on an on/off operation of the switch element
Implementation Method 3
a temperature estimating unit that obtains a conduction loss of the switch element and a switching loss of the switch element on the basis of a current value detected by the current detecting unit to estimate the temperature of the detection target
Data Source
AI summary
A temperature detecting apparatus detects a temperature of a detection target having a switch element. The temperature detecting apparatus includes a current detecting unit and a temperature estimating unit. The current detecting unit detects an output current from the detection target changing depending on an on/off operation of the switch element. The temperature estimating unit, on the basis of a current value detected by the current detecting unit, calculates a conduction loss of the switch element and a switching loss of the switch element to estimate the temperature of the detection target on the basis of the calculated conduction loss and the calculated switching loss.