Temperature Sensor Diode Precision via Multi-Current Evaluation
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Solution Overview
Problem
Temperature sensors using PN junction diodes face challenges in achieving high-precision temperature detection due to deviations in saturation current and the presence of resistive components, which affect the accuracy of temperature measurement.
Innovation Solution
A temperature sensor configuration that employs a diode inserted into a target path, supplying three evaluation currents at different times to eliminate the influence of saturation current and resistive components, using a current supply circuit, voltage detection circuit, and arithmetic circuit to calculate the temperature based on detected voltages, according to specific formulas that account for the resistive component and saturation current deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a PN junction diode is used for temperature detection, then temperature measurement can be performed, but measurement precision deteriorates due to saturation current deviation and resistive component influences
Solution Approach 1:
The patent measures the diode's forward voltage at three different current levels (first, second, and third evaluation currents) to obtain three voltage values. By utilizing multiple parameter measurements under varying current conditions, the system can mathematically eliminate the effects of saturation current deviation and resistive components, thereby improving temperature measurement accuracy despite these interfering factors
Solution Approach 2:
The patent employs a feedback mechanism where the measured voltage values at different current levels are fed into a calculation process that determines the temperature. The system continuously monitors and adjusts based on the voltage-current relationships, using the feedback from multiple measurement points to compensate for saturation current and resistance variations, thus maintaining high measurement precision
2Measurement precision
If evaluation currents are supplied at different timings, then the influence of saturation current can be eliminated, but device complexity increases due to multiple current supply operations
Solution Approach 1:
The patent implements periodic action by supplying evaluation currents at different timings in a cyclic manner. The current supply circuit alternately applies first, second, and third evaluation currents to the diode at different time points, allowing voltage measurements to be taken sequentially. This periodic current application enables the system to eliminate saturation current effects through temporal separation of measurement conditions
Solution Approach 2:
The patent segments the temperature measurement process into three distinct measurement stages, each corresponding to a different evaluation current level. By dividing the overall measurement into separate temporal segments with different current conditions, the system can independently measure voltage at each stage and subsequently process these segmented measurements to eliminate the influence of saturation current and resistive components
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 configuration enables high-precision temperature detection by eliminating the influences of saturation current and resistive component deviations, resulting in accurate temperature measurement.
Implementation Method 1
Temperature sensors performing temperature detection by using PN junction diodes are extensively used
Data Source
AI summary
The present disclosure provides a temperature sensor. The temperature sensor includes: a temperature detection diode, disposed at a position having a target temperature and inserted into a target path between a first node and a second node; a current supply circuit, configured to supply first to third evaluation currents to the target path in a forward direction of the temperature detection diode at different timings; a voltage detection circuit, configured to detect a voltage between the first node and the second node when the first to third evaluation currents are respectively supplied to the target path as first to third evaluation voltages; and an arithmetic circuit, configured to detect the target temperature based on the first to third evaluation voltages.