Temperature Measurement Circuit Error Compensation
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Solution Overview
Problem
Temperature measurement errors occur due to reference voltage errors in positive temperature coefficient characteristics, leading to inaccuracies in temperature readings, with a +1% voltage error resulting in a 2-4°C error in measured temperature.
Innovation Solution
A temperature measurement circuit and method that generates both positive and negative temperature coefficient characteristics, using a mapping unit, determining unit, and calibration unit to calculate an accurate temperature by compensating for errors using a negative temperature coefficient characteristic, with the equation T=(KP×TP+KN×TN)/(KP+KN) determining the measured temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a positive temperature coefficient voltage measuring method is used, then the temperature measurement is simple and linear, but the measurement precision deteriorates due to reference voltage errors causing 2-4°C error
Solution Approach 1:
The patent introduces a second voltage measuring method with negative temperature coefficient characteristic to complement the first method's positive temperature coefficient characteristic. By changing the parameter approach from single-method to multi-method measurement, the system compensates for reference voltage errors while maintaining operational simplicity through automated combination of results.
Solution Approach 2:
The patent uses a processor as an intermediary to combine the results from two different voltage measuring methods. The processor calculates the temperature using both the first voltage value (positive temperature coefficient) and second voltage value (negative temperature coefficient), thereby mediating between the two measurement approaches to achieve higher precision while keeping the interface simple.
2Device complexity
If only a single voltage measuring method is used, then the device complexity is low, but the measurement precision is insufficient due to uncorrected reference voltage errors
Solution Approach 1:
The patent merges two different voltage measuring methods into a single temperature measurement system. The first voltage measuring circuit and second voltage measuring circuit are combined with a processor that integrates their results, achieving higher precision without requiring completely separate measurement systems.
Solution Approach 2:
The processor serves multiple functions: it receives the first voltage value from the first measuring method, receives the second voltage value from the second measuring method, and calculates the final temperature using both inputs. This multi-functionality allows the system to achieve high precision while maintaining relatively simple device architecture.
3Device complexity
If reference voltage errors are present, then the measurement system remains simple, but the temperature reading becomes inaccurate by several degrees
Solution Approach 1:
The patent implements a feedback mechanism where the second voltage measuring method (with negative temperature coefficient) provides compensating information that feeds back to correct the errors in the first voltage measuring method (with positive temperature coefficient). The processor uses both voltage values to calculate an corrected temperature that compensates for reference voltage errors.
Solution Approach 2:
The patent converts the harmful effect of reference voltage errors into a beneficial compensation mechanism. By introducing a second measuring method that has an opposite temperature coefficient characteristic, the system turns the error pattern into a correctable signal, where the second measurement's sensitivity to reference voltage changes compensates for the first measurement's errors.
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 allows for accurate temperature calculation by compensating measurement errors caused by reference voltage errors, achieving precise temperature readings through simple operations.
Implementation Method 1
The sensing unit is arranged for generating a positive temperature coefficient characteristic and a negative temperature coefficient characteristic according to a temperature
Implementation Method 2
The sensing unit is arranged for generating a positive temperature coefficient characteristic and a negative temperature coefficient characteristic according to a temperature
Implementation Method 3
The temperature translation unit is coupled to the sensing unit, and is arranged for generating a measured temperature according to the positive temperature coefficient characteristic and the negative temperature coefficient characteristic
Data Source
AI summary
A temperature measurement circuit includes a sensing unit and a temperature translation unit. The sensing unit is arranged for generating a positive temperature coefficient characteristic and a negative temperature coefficient characteristic according to a temperature. The temperature translation unit is coupled to the sensing unit, and is arranged for generating a measured temperature according to the positive temperature coefficient characteristic and the negative temperature coefficient characteristic.