Semiconductor Component Arrangement with Integrated Temperature Measuring Resistor
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Solution Overview
Problem
Existing semiconductor component arrangements with power transistors lack a simple and highly sensitive temperature measuring solution that can be easily integrated using conventional production methods, which can lead to overheating and potential component damage.
Innovation Solution
A semiconductor component arrangement that incorporates a temperature measuring resistor formed from a portion of the same semiconductor zone as the body zone, utilizing conventional doping methods to achieve a high temperature coefficient, coupled with an evaluation circuit to monitor temperature changes and trigger countermeasures when critical temperatures are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature measuring arrangement is added to monitor power transistor temperature, then overheating protection is improved, but device complexity increases
Solution Approach 1:
The temperature measuring resistor is merged with the body zone of the power transistor by using the same semiconductor zone. The body zone serves dual purposes: as the active region for the transistor and as the temperature sensing element. This integration eliminates the need for separate temperature sensing components and reduces overall device complexity while maintaining reliable overheating protection.
Solution Approach 2:
The semiconductor zone is designed to perform multiple functions simultaneously. It acts as the body zone for the power transistor's electrical operation and as the temperature measuring resistor for thermal monitoring. This multi-functionality reduces the number of components needed and simplifies the overall device structure while ensuring reliable temperature monitoring for overheating protection.
2Ease of manufacture
If conventional doping methods are used to produce the temperature measuring resistor, then ease of manufacture is improved, but temperature sensitivity may be insufficient
Solution Approach 1:
The doping concentration in the body zone is optimized to achieve the desired temperature coefficient for the measuring resistor. By carefully controlling the dopant dose within conventional ranges (around 5·10¹³ cm⁻²), the resistance temperature coefficient is enhanced to approximately 50% per 100 K, providing high temperature sensitivity. This parameter optimization allows conventional doping methods to produce a measuring resistor with sufficient temperature sensitivity for effective overheating detection.
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 provides a highly sensitive temperature measurement capability, allowing for effective overheating detection and prevention in power transistors, ensuring component safety and reliability by using conventional production methods to create a temperature measuring resistor with a high temperature coefficient.
Implementation Method 1
both the reverse current in a reverse biased diode and the voltage drop across a forward biased diode carrying a constant current have a pronounced temperature dependency, which means that these variables can be used to measure temperature
Implementation Method 2
Temperature can be measured using the evaluation circuit by impressing a constant current from a current source on the temperature measuring resistor, which means that the measuring resistor has a voltage across it which is dependent on its resistance value and hence on the temperature
Data Source
AI summary
A semiconductor component arrangement includes a power transistor and a temperature measurement circuit. The power transistor includes a gate electrode, a source zone, a drain zone and a body zone. The body zone is arranged in a first semiconductor zone of a first conduction type. The temperature measuring circuit comprises a temperature-dependent resistor and an evaluation circuit coupled to the temperature-dependent resistor. The resistor is formed by a portion of said first semiconductor zone.