Repoling Driving Device for Piezoelectric Element Depolarization
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Solution Overview
Problem
Piezoelectric elements experience a decline in vibration intensity and piezoelectric effect due to depolarization, leading to reduced capacitance and performance, as they are influenced by electric fields and heat.
Innovation Solution
A repoling driving device comprising a piezoelectric driver, processor, and current detector that generates a repoling signal when output current falls below a threshold, triggering repolarization of the piezoelectric element to maintain its piezoelectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If piezoelectric material is driven by DC and AC signals, then the piezoelectric element can operate for long time, but the piezoelectric effect declines due to depolarization
Solution Approach 1:
The patent implements a feedback mechanism by detecting the output current of the piezoelectric element and comparing it with a reference current. When the output current falls below the reference current indicating depolarization, the system automatically triggers a repolarization process. This closed-loop feedback ensures the piezoelectric element maintains its performance throughout long-term operation.
Solution Approach 2:
The patent applies preliminary repolarization action to prevent performance degradation. By detecting early signs of depolarization through current monitoring and applying repolarization voltage before complete failure occurs, the system proactively maintains the piezoelectric effect, ensuring reliable operation over extended periods.
2Force
If voltage across piezoelectric material is increased to increase vibration strength, then vibration intensity increases, but depolarization occurs faster
Solution Approach 1:
The system uses feedback control to monitor the output current and detect depolarization conditions. When depolarization is detected, the system automatically applies repolarization voltage, allowing the piezoelectric element to maintain high vibration intensity even during prolonged operation at high voltages.
3Reliability
If piezoelectric element operates under electric field and heat, then it can maintain piezoelectric properties, but depolarization occurs leading to performance decline
Solution Approach 1:
The patent employs feedback control by continuously monitoring the output current of the piezoelectric element. When the current drops below a reference value indicating depolarization, the system automatically triggers repolarization, thereby maintaining piezoelectric properties despite exposure to electric fields and heat.
Solution Approach 2:
The system performs self-service by automatically detecting and correcting its own depolarization condition. The repolarization circuit is activated by the control unit when depolarization is detected, allowing the piezoelectric element to restore its own properties without external intervention.
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 repoling driving device effectively maintains the piezoelectric effect by repolarizing the element, ensuring consistent performance and vibration intensity, as demonstrated by capacitance and power consumption curves after multiple repolarization treatments.
Implementation Method 1
The special arrangement of atoms in the lattice makes the piezoelectric material have the effect of coupling the stress field and the electric field, which is called the piezoelectric effect
Implementation Method 2
The so-called polarization (i.e., poling) is to apply a strong DC electric field to the piezoelectric material, so that the electric domains in the piezoelectric material are arranged in the direction of the electric field
Data Source
AI summary
A repoling driving device and a method thereof is disclosed. The repoling driving device, coupled to a piezoelectric element, includes a piezoelectric driver, a processor, and a current detector. The piezoelectric driver is coupled to the piezoelectric element. The processor is coupled to the piezoelectric driver. The processor drives the piezoelectric driver to generate a driving voltage. The piezoelectric element receives the driving voltage to generate an output current. The current detector is coupled to the piezoelectric element and the processor. The current detector receives the output current. When the output current is less than a given current, the current detector generates and transmits a repoling signal to the processor. The processor controls the piezoelectric driver to repolarize the piezoelectric element in response to the repoling signal.