NTC Temperature Sensing Circuit for High-Temperature Accuracy
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Solution Overview
Problem
Existing temperature sensors using negative temperature coefficient of resistance (NTC) face challenges in accurately sensing temperature in high temperature sections due to non-linear and small resistance value changes, and fail to detect circuit failures effectively.
Innovation Solution
A temperature sensing apparatus with a first and second voltage generator, a voltage adjuster, and a controller, utilizing a switch and multiple NTC resistors to adjust voltage levels and ensure accurate temperature sensing across all sections, including high temperatures, and to detect sensor failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an NTC temperature sensor is used, then temperature sensing is enabled, but temperature sensing accuracy decreases in high temperature sections due to small resistance value changes
Solution Approach 1:
The patent applies dynamics by making the circuit configuration changeable through a switch that transitions between open and closed states based on temperature conditions. The controller dynamically adjusts the circuit topology (switching between different resistor configurations) to optimize temperature sensing accuracy across different temperature ranges, resolving the contradiction between general NTC sensing capability and high-temperature precision.
Solution Approach 2:
The patent changes circuit parameters by switching between different resistor configurations (series/parallel combinations) based on temperature conditions. The controller modifies the effective resistance values and voltage division ratios in the circuit to maintain optimal sensing characteristics across the full temperature range, thereby improving high-temperature measurement precision while maintaining general sensing functionality.
2Reliability
If a single NTC resistor is used, then device complexity is low, but failure detection capability is insufficient
Solution Approach 1:
The patent segments the temperature sensing function into multiple independent NTC resistors (first NTC resistor and second NTC resistor) with separate voltage generators and processing paths. This segmentation allows the system to detect failures in individual components by comparing signals from multiple sensors, improving reliability without requiring a completely complex redesign of the entire system.
Solution Approach 2:
The patent implements feedback mechanisms where the controller continuously monitors voltage signals from multiple NTC resistors and compares them against expected values. The system provides feedback about sensor health status by detecting inconsistencies or out-of-range values, enabling failure detection while maintaining a relatively simple circuit structure through intelligent signal processing.
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 apparatus maintains accurate temperature sensing and detects failures by adjusting voltage levels and utilizing multiple NTC resistors, ensuring precise temperature measurement and failure detection without external control signals.
Implementation Method 1
the first temperature sensor is a device that converts a temperature into a voltage
Implementation Method 2
the second temperature sensor may be a device that converts a temperature into a voltage
Implementation Method 3
A negative temperature coefficient of resistance (an NTC) is commonly used for the temperature sensors. Since a resistance value of the NTC changes depending on a temperature
Data Source
AI summary
A temperature sensing apparatus includes a first voltage generator including a first resistor and a first temperature sensor, a second voltage generator that generates a control voltage, a voltage adjuster connected in parallel with the first resistor and that adjusts a voltage applied to the first temperature sensor based on the control voltage, and a controller that senses a temperature based on the voltage applied to the first temperature sensor, and the first temperature sensor is a device that converts a temperature into a voltage.