Pressure Sensor Temperature Detection Circuit
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Solution Overview
Problem
Existing pressure sensors with resistor bridge circuits face challenges in accurately detecting temperature characteristics, which affect pressure measurement accuracy, and require a constant current source that can reduce sensor sensitivity.
Innovation Solution
A temperature detection circuit is configured to form switchable first and second paths between the differential output terminals of a pressure sensor, allowing a controller to measure voltages and a calculator to calculate temperature information without a constant current source, maintaining signal-to-noise ratio and sensor sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant current source is connected between diagonal output terminals of a resistor bridge circuit to acquire temperature information, then temperature detection capability is improved, but sensor sensitivity is reduced
Solution Approach 1:
The patent divides the measurement function into two separate paths: one path (first path) supplies current to one differential output terminal for temperature detection, while the other path (second path) drains current from the other differential output terminal. This segmentation allows independent optimization of temperature detection without affecting pressure measurement sensitivity, resolving the contradiction between temperature detection accuracy and sensor sensitivity.
2Measurement precision
If a constant current source is used for temperature detection, then temperature information can be acquired, but the device complexity increases
Solution Approach 1:
The patent extracts the temperature detection function from the traditional constant current source configuration by creating separate first and second paths that switchably connect to differential output terminals. This extraction eliminates the need for a dedicated constant current source while maintaining temperature detection capability, thereby reducing device complexity.
3Reliability
If switchable paths are implemented for temperature detection, then sensor sensitivity is maintained, but device complexity increases
Solution Approach 1:
The switchable first and second paths serve multiple functions: they enable temperature detection by supplying and draining current through differential output terminals, while simultaneously maintaining pressure measurement sensitivity through proper switching control. This multi-functionality reduces the need for separate dedicated circuits, thereby limiting the increase in device complexity.
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 accurate temperature information acquisition for pressure sensor correction, eliminating the need for a constant current source and maintaining sensor sensitivity, thereby improving measurement accuracy.
Implementation Method 1
A pressure sensor may include a resistor bridge circuit which uses a diffused resistor and have a temperature characteristic
Data Source
AI summary
A sensor apparatus includes: a sensor that includes a resistor bridge circuit; a temperature detection circuit that provides a first path and a second path; a voltage measurement portion that measures a voltage of each of the differential output terminals; a controller that causes the voltage measurement portion to measure the voltage of each of the two differential output terminals; and a calculator that calculates a difference between the voltages of the two differential output terminals to acquire temperature information of the sensor.