Piezoelectric Vibration Control via Capacitance Feedback
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Solution Overview
Problem
The vibration strength of electronic devices using piezoelectric elements decreases due to depolarization over time, as the electric field generated by driving voltage causes the piezoelectric element to depolarize, reducing its effectiveness in generating vibrations.
Innovation Solution
An electronic device comprising a piezoelectric element, a capacitive sensor, and a control unit that detects capacitance changes and adjusts the driving voltage by calculating the difference between detected and preset capacitance values to maintain optimal vibration strength, preventing depolarization-induced vibration loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If driving voltage is applied to generate vibration, then vibration strength is improved, but depolarization occurs causing vibration strength to decrease over time
Solution Approach 1:
The patent implements a feedback mechanism where the capacitive sensor continuously monitors the capacitance of the piezoelectric element, and the control unit adjusts the driving voltage based on the detected capacitance changes. This closed-loop feedback system detects depolarization early and compensates by modifying the driving voltage, thereby maintaining stable vibration strength over time despite continuous operation.
Solution Approach 2:
The patent dynamically changes the driving voltage parameter based on the detected capacitance state of the piezoelectric element. When depolarization is detected through capacitance measurement, the control unit adjusts the driving voltage magnitude to compensate for the degradation, thereby maintaining optimal vibration strength. This parameter adaptation allows the system to operate reliably over extended periods.
2Reliability
If capacitive sensor and control unit are added to detect and adjust capacitance, then vibration strength stability is improved, but device complexity increases
Solution Approach 1:
The capacitive sensor serves multiple functions: it acts as both a structural component of the electronic device and a detection element for monitoring piezoelectric element capacitance. By integrating the sensor into the existing device architecture, the patent minimizes additional complexity while achieving reliable depolarization detection and compensation.
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 effectively maintains vibration strength by dynamically adjusting the driving voltage in response to depolarization, ensuring consistent performance of the piezoelectric element over time.
Implementation Method 1
the piezoelectric element generates vibration according to the driving voltage
Implementation Method 2
the capacitive sensor is coupled to both sides of the piezoelectric element in order to detect a capacitance between the two sides of the piezoelectric element
Data Source
AI summary
An electronic device and an adjustment method thereof are provided. Generate an adjustment voltage according to a preset capacitance and a capacitance detected by a capacitive sensor coupled to both sides of a piezoelectric element, and generate a driving voltage to drive the piezoelectric element according to the adjustment voltage, so as to avoid depolarization of the piezoelectric element affecting the vibration strength of the vibration device.