Piezoelectric Actuator Feedback Using Partial-Cycle Operation Data
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Solution Overview
Problem
Conventional piezoelectric element drive circuits face difficulties in achieving optimal feedback control for piezoelectric actuators.
Innovation Solution
The proposed solution involves obtaining operation information during a specific period of the drive cycle of the piezoelectric element and performing feedback control of drive parameters based on this information to optimize the actuator's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is performed using conventional methods, then the drive circuit can control the piezoelectric element, but it cannot achieve optimal drive state
Solution Approach 1:
The patent segments the drive cycle into multiple periods and selects specific periods for obtaining operation information. By dividing the cycle and choosing optimal segments, the system achieves precise feedback control that leads to optimal drive state, resolving the contradiction between control precision and optimal performance achievement.
Solution Approach 2:
The patent performs preliminary actions by obtaining operation information in advance during specific periods of the drive cycle. This preliminary data collection enables the control unit to make informed feedback control decisions, achieving both precise control and optimal drive state.
2Loss of information
If operation information is obtained throughout the entire drive cycle, then comprehensive control data is available, but the system complexity increases
Solution Approach 1:
The patent extracts only the necessary operation information from specific periods of the drive cycle rather than collecting data throughout the entire cycle. This extraction approach maintains sufficient control data completeness while reducing the complexity of information obtainment and processing.
Solution Approach 2:
The patent applies partial action by obtaining operation information only during selected periods rather than continuously. This partial data collection is sufficient for effective feedback control, avoiding the excessive complexity of complete cycle monitoring while maintaining adequate control information.
3Power
If the piezoelectric element is driven at high power, then maximum output is achieved, but the risk of damage increases
Solution Approach 1:
The patent implements feedback control where the control unit receives operation information, compares it with reference values, and adjusts the drive parameters accordingly. This feedback mechanism enables high power operation while monitoring for damaging conditions, allowing the system to operate at maximum output safely by detecting and responding to potential damage indicators.
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 approach allows the piezoelectric actuator to operate at maximum output by aligning the drive signal phase difference with the optimal displacement state of the piezoelectric element, thereby enhancing the device's performance.
Implementation Method 1
a piezoelectric element (21) and a piezoelectric actuator drive circuit (10)... transforms electrical energy to mechanical energy to produce displacement
Data Source
AI summary
The present invention is a piezoelectric actuator drive method, a piezoelectric actuator drive circuit, and a piezoelectric actuator drive system capable of causing a piezoelectric element to vibrate in a maximum amplitude state. The piezoelectric actuator drive circuit includes: an obtainment unit that obtains operation information pertaining to operation of the piezoelectric element in a period that is a part of one cycle of a drive cycle in which the piezoelectric element is driven; and a control unit that performs feedback control of a drive parameter for driving the piezoelectric element based on the operation information.