Temperature Sensor Calibration Using Dual Sensing Values
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Solution Overview
Problem
Temperature sensing devices suffer from errors in sensing signals that affect their accuracy, leading to reduced performance.
Innovation Solution
A temperature sensing device with a sensor, converter, sensing result generating circuit, error circuit, calibration circuit, and output circuit that determines and calibrates errors in sensing signals to improve accuracy by generating compensation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensing is performed using a sensor, then temperature measurement is achieved, but sensing signal errors reduce measurement precision
Solution Approach 1:
The patent performs preliminary calibration before normal temperature sensing operations. The calibration process determines compensation values in advance that are stored and applied during subsequent measurements, eliminating errors before they affect measurement precision
Solution Approach 2:
The patent implements a feedback mechanism where sensing results are compared against reference values, and compensation values are adjusted based on the detected errors. This closed-loop approach continuously improves sensing signal accuracy and measurement precision
2Measurement precision
If compensation values are applied to correct sensing errors, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuits. The calibration circuit, sensing result generating circuit, and compensation value application are merged into a unified temperature sensing device, reducing overall system complexity while maintaining measurement precision
Solution Approach 2:
The temperature sensing device performs self-calibration and self-compensation. The device automatically determines compensation values and applies them without external intervention, simplifying the operational complexity while improving sensing accuracy
Data Source
AI summary
A temperature sensing device and a calibration method of the temperature sensing device are provided. Based on different conditions, the temperature sensing device generates a first digital sensing value and a second digital sensing value corresponding to an ambient temperature. The temperature sensing device generates a first sensing result value according to the first digital sensing value, a first compensation value, and a sensing difference value between the first digital sensing value and the second digital sensing value, and generates a second sensing result value according to the second digital sensing value, a second compensation value, and the sensing difference value. The temperature sensing device obtains an error from the first sensing result value and the second sensing result value according to a first reference value and a second reference value. The temperature sensing device calibrates the first compensation value according to the error.