Temperature Detection Device With Forward Current Correction Circuit
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Solution Overview
Problem
Conventional temperature detection circuits in semiconductor modules suffer from errors in case temperature detection due to variations in the forward voltage of the temperature detection diode, leading to inaccurate overheating state identification and widened detection standards.
Innovation Solution
A temperature detection device incorporating a comparator, a forward current correction circuit with a current mirror circuit, an operational amplifier, and a variable resistor to adjust the forward current of the temperature detection diode, allowing for dynamic correction of the forward voltage and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional temperature detection circuit is used, then the circuit structure is simple, but temperature detection accuracy deteriorates due to forward voltage variations
Solution Approach 1:
The patent changes the operating parameters of the temperature detection diode by dynamically adjusting the forward current through a correction circuit. By varying the forward current to compensate for forward voltage variations, the system maintains accurate temperature detection without requiring a completely new detection mechanism, thus improving measurement precision while controlling device complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the detected forward voltage is compared against reference values, and the difference is used to adjust the forward current through an operational amplifier and correction circuit. This closed-loop feedback system continuously compensates for voltage variations, maintaining high temperature detection accuracy while using a manageable circuit structure.
2Measurement precision
If the forward current of the temperature detection diode is increased to improve detection accuracy, then temperature detection accuracy improves, but power consumption increases
Solution Approach 1:
The patent employs dynamic adjustment of the forward current through a correction circuit rather than using a fixed high current. The current is dynamically optimized to provide sufficient detection accuracy while minimizing power consumption, allowing the system to adapt the power level to the actual detection requirements rather than continuously consuming high power.
Solution Approach 2:
The system changes the forward current parameter dynamically based on detection needs and voltage variations, rather than maintaining a constantly high current level. This parameter optimization allows the system to achieve necessary detection accuracy with minimal power consumption by using only the current level required for accurate measurement.
3Measurement precision
If correction circuits are added to improve detection accuracy, then temperature detection accuracy improves, but mounting area increases
Solution Approach 1:
The patent merges the correction circuit functions with the existing temperature detection circuit by integrating the operational amplifier, current mirror circuit, and variable resistor into the same circuit architecture. This consolidation allows the correction functionality to be added without proportionally increasing the mounting area, as shared components and integrated layouts reduce the overall space requirement.
Solution Approach 2:
The correction circuit components serve multiple functions: the operational amplifier provides both signal amplification and current regulation, the current mirror circuit enables both current copying and correction, and the variable resistor provides both adjustment capability and circuit stabilization. This multi-functionality reduces the total component count and mounting area compared to separate dedicated circuits for each function.
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
The solution reduces errors in case temperature detection by correcting both the threshold voltage and forward current, enhancing temperature detection accuracy and maintaining a compact mounting area.
Implementation Method 1
the forward voltage VF falls with a rise in case temperature... temperature coefficient of VF is the temperature change amount (mV/° C.) of VF in the range of 25 to 125° C.
Implementation Method 2
a current mirror circuit including a first transistor and a second transistor... which corrects a forward current of the temperature detection diode
Implementation Method 3
an operational amplifier... the threshold voltage being inputted to a negative input terminal of the comparator
Data Source
AI summary
A temperature detection device includes a temperature detection diode, a comparator, and a forward current correction circuit. The comparator compares a forward voltage of the temperature detection diode with a threshold voltage and outputs a level signal corresponding to a temperature state. The forward current correction circuit includes a current mirror circuit including a first transistor and a second transistor, a third transistor, an operational amplifier and a variable resistor, and corrects a forward current of the temperature detection diode to change the forward voltage.