Temperature Sensor Circuit Reduces Measurement Error
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Solution Overview
Problem
Conventional temperature sensor circuits face errors in temperature measurement due to temperature dependency distortion in the reference voltage, which affects the output voltage and accuracy of temperature determination.
Innovation Solution
A temperature sensor circuit configuration that includes a reference voltage circuit, first and second amplifying circuits, a voltage dividing circuit, and a measuring circuit, where the reference voltage is controlled to reduce temperature dependency distortion by using diodes with different current densities and a voltage dividing mechanism to cancel out temperature gradients, resulting in an output signal with reduced measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional temperature sensor circuit uses a common band gap reference (BGR) circuit to generate reference voltage, then the reference voltage is available for temperature measurement, but the temperature dependency distortion of the reference voltage causes error in temperature measurement
Solution Approach 1:
The patent introduces a compensation circuit as an intermediary component that generates a compensation voltage to counteract the temperature dependency distortion of the reference voltage. This compensation circuit acts as a mediator between the reference voltage source and the temperature measurement circuit, canceling out the harmful temperature effects through differential voltage generation and feedback mechanisms.
Solution Approach 2:
The patent changes the parameters of the reference voltage by introducing temperature compensation mechanisms that adjust the reference voltage characteristics. By modifying the reference voltage parameters (magnitude, temperature coefficient) through compensation circuits and selectable switching, the system achieves more accurate temperature measurement across different temperature ranges.
2Device complexity
If the reference voltage has temperature dependency distortion, then the reference voltage can be supplied from a simple BGR circuit, but the output voltage is affected causing temperature measurement error
Solution Approach 1:
The patent segments the temperature measurement system into multiple independent modules: a reference voltage generation unit, a compensation voltage generation unit, and a differential measurement unit. This segmentation allows the simple BGR circuit to continue providing reference voltage while separate compensation circuits correct the temperature distortion, and the differential unit processes the corrected signals to achieve high measurement precision.
3Ease of operation
If temperature dependency distortion is not compensated, then the circuit operation is simple, but the temperature measurement accuracy deteriorates
Solution Approach 1:
The compensation circuit is designed to automatically generate compensation voltage based on the temperature-dependent characteristics of the reference voltage, without requiring external manual adjustment or complex control logic. The circuit self-regulates by using the inherent temperature dependencies of semiconductor components to generate opposing compensation effects, maintaining measurement accuracy while preserving operational simplicity.
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 proposed solution effectively reduces the error of temperature measurement by canceling out temperature dependency distortion in the reference voltage, ensuring more accurate temperature determination.
Implementation Method 1
a first light emitting diode that emits first light of a first wavelength in a first forward direction along a first current path and has a first current density
Data Source
AI summary
The temperature sensor circuit includes a diode that is connected to a first potential at a cathode thereof. The temperature sensor circuit includes a voltage dividing circuit that is connected to an anode of the diode at a second end thereof and outputs a divided voltage. The temperature sensor circuit includes a second amplifying circuit that receives the first signal at a first input end thereof, receives the divided voltage at a second input end thereof, is connected to a first end of the voltage dividing circuit at an output end thereof and outputs a second signal so as to make the divided voltage equal to the first signal. The temperature sensor circuit includes a measuring circuit that calculates a voltage difference between the first signal and the second signal and outputs an output signal based on the result of the calculation.