Series-Coupled Capacitance Pressure Sensor with Opposite-Phase Signal Detection
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Solution Overview
Problem
Conventional pressure detection methods using a single capacitor are inefficient as they can only detect pressure applied at one timing, leading to suboptimal detection efficiency.
Innovation Solution
A pressure sensor device employs two capacitance elements coupled in series, with a positive-phase and reverse-phase signal applied from opposite sides to a coupling point, allowing for the detection of pressures based on potential fluctuations, thereby improving detection efficiency by distinguishing between pressures applied to each element at one timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single capacitor is used for pressure detection, then the device complexity is low, but the detection efficiency is poor because pressure can only be detected at one timing
Solution Approach 1:
The single capacitor is segmented into two capacitance elements coupled in series, with a coupling point between them. This segmentation allows independent pressure detection on both elements simultaneously, improving detection efficiency from one timing to two timings per measurement cycle while maintaining relatively simple device structure
Solution Approach 2:
The patent transitions from single-point pressure detection to two-point pressure detection by utilizing the coupling point between two capacitance elements. This dimensional change in detection points enables simultaneous pressure measurement at different locations, effectively doubling the detection efficiency without proportionally increasing device complexity
2Productivity
If two capacitance elements are used with opposite-phase signals, then pressure detection efficiency is improved, but the device complexity increases
Solution Approach 1:
Two capacitance elements are merged in series configuration sharing a common coupling point, and opposite-phase signals are combined and applied to both elements. This merging approach enables simultaneous pressure detection on both elements using a unified signal generation and measurement system, improving detection efficiency while controlling device complexity through resource sharing
Solution Approach 2:
The coupling point between the two capacitance elements serves multiple functions: it acts as the connection point for series configuration, the reference point for potential fluctuation measurement, and the common terminal for opposite-phase signal application. This multi-functionality reduces the need for additional components, improving detection efficiency without proportionally increasing 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 efficient detection of pressures applied to both capacitance elements simultaneously, enhancing the overall efficiency of pressure sensing.
Implementation Method 1
pressures applied to the first capacitance element and the second capacitance element are detected based on a potential fluctuation at the coupling point
Data Source
AI summary
To improve the efficiency of pressure detection, a driver applies a positive-phase signal to a capacitance element from an opposite side to a coupling point in a control device. Another driver applies a reverse-phase signal to another capacitance element from an opposite side to the coupling point. A control unit detects pressures applied to the capacitance elements based on a potential fluctuation at the coupling point.