Piezoelectric Sensor Module Self-Powering Vibration Detection
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Solution Overview
Problem
Small sensor modules used for detecting abnormal vibrations in equipment and machinery face challenges in power consumption, requiring frequent battery changes due to limited battery capacity, necessitating a reduction in power consumption for extended operation.
Innovation Solution
A sensor module incorporating a piezoelectric sensor and switch with a CMOS circuit, where the piezoelectric elements resonate at specific vibration frequencies, allowing for voltage generation without an external power source, and a MEMS switch with low drive voltage and reduced power consumption, enabling detection of various vibration frequencies without electricity consumption during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small sensor module is used for vibration detection, then the installation constraints are reduced, but the battery capacity is limited requiring frequent battery changes
Solution Approach 1:
The piezoelectric element generates electrical energy from the vibration it detects, allowing the sensor module to power itself without an external battery. This self-powering mechanism eliminates the need for battery replacement while maintaining a compact form factor suitable for various installation locations.
2Duration of action of moving object
If the sensor module operates for long hours, then continuous monitoring is achieved, but power consumption must be minimized
Solution Approach 1:
The sensor module operates in periodic cycles where the piezoelectric element converts vibration energy into electrical energy during active detection periods. This periodic energy generation allows the module to achieve long-term operation with minimal average power consumption by synchronizing energy harvesting with vibration detection cycles.
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 solution enables long-term operation of the sensor module with reduced power consumption, allowing for continuous monitoring of vibrations without battery changes, while providing high precision and reliability in detecting frequency and strength of abnormal vibrations.
Implementation Method 1
The sensor includes a first piezoelectric element... The first piezoelectric element is set with a resonance frequency to resonate at a vibration frequency of a detection target
Implementation Method 2
The first piezoelectric element is set with a resonance frequency to resonate at a vibration frequency of a detection target
Data Source
AI summary
According to one embodiment, a sensor module includes at least one sensor and at least one switch. The sensor includes a first piezoelectric element. The first piezoelectric element includes a first electrode. The first piezoelectric element is set with a resonance frequency to resonate at a vibration frequency of a detection target. The switch includes a second piezoelectric element. The second piezoelectric element includes a second electrode connected to the first electrode and a third electrode electrically separated from the second electrode.