Piezoelectric Pump Driving System Dynamic Voltage Frequency Control
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Solution Overview
Problem
Conventional driving systems for piezoelectric pumps face challenges in precisely controlling performance and output flowrate due to variations in piezoelectric pump designs, leading to poor compatibility and potential damage from fixed voltage or frequency settings, and limited applicability.
Innovation Solution
A driving system that includes a voltage conversion module, switching module, detecting module, and microcontroller to provide a variable output voltage and control a variable working frequency, allowing for precise adjustment of gas pressure by comparing actual and predetermined pressure changes, thus optimizing the operation of piezoelectric actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed output voltage and fixed working frequency are provided to the piezoelectric actuator, then the driving system is simple to operate, but the performance and output flowrate of different piezoelectric pumps cannot be precisely controlled due to variations in design, structure, and assembling tolerance
Solution Approach 1:
The patent implements dynamic control of both output voltage and working frequency through a microcontroller that independently adjusts these parameters based on pump characteristics, replacing the conventional fixed-parameter approach. This enables precise control of performance and output flowrate while maintaining ease of operation through automated adjustment.
Solution Approach 2:
The system changes multiple operating parameters (voltage and frequency) simultaneously to optimize pump performance. The microcontroller adjusts voltage amplitude and frequency based on detected pump characteristics, allowing precise control despite manufacturing variations in different piezoelectric pumps.
2Adaptability or versatility
If a variable output voltage and fixed working frequency are provided to the piezoelectric actuator, then the output voltage can be adjusted for different pump types, but the system fails to operate different types of piezoelectric pumps at their optimal working frequencies
Solution Approach 1:
The system dynamically adjusts the working frequency in addition to voltage amplitude. The microcontroller independently controls frequency based on pump type detection, ensuring each pump operates at its optimal frequency while maintaining compatibility across different pump designs.
Solution Approach 2:
The patent changes both voltage and frequency parameters to achieve optimal operation. By simultaneously adjusting amplitude and frequency based on pump characteristics, the system achieves both compatibility and optimal productivity for different piezoelectric pump types.
3Adaptability or versatility
If a fixed output voltage and variable working frequency are provided to the piezoelectric actuator, then the working frequency can be adjusted for different pump types, but the performance of the piezoelectric pump increases or decreases abruptly and the range of controllable working frequency is narrowed
Solution Approach 1:
The system changes both voltage amplitude and frequency parameters in a coordinated manner. The microcontroller adjusts voltage amplitude to complement frequency changes, ensuring smooth and stable performance transitions while expanding the controllable frequency range and preventing abrupt performance variations.
4Productivity
If a higher voltage is used to drive piezoelectric pumps with optimal working frequencies different from the fixed frequency, then the pumps can operate at their optimal frequency, but the piezoelectric property of the piezoelectric actuator may be lost and the piezoelectric pump is damaged
Solution Approach 1:
The system changes voltage amplitude in coordination with frequency adjustment. The microcontroller optimizes the voltage-frequency combination to achieve optimal pump operation while maintaining safe voltage levels that preserve piezoelectric actuator properties and prevent damage.
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 system enables precise control of performance and output flowrate, enhances compatibility with different piezoelectric pumps, and prevents damage by dynamically adjusting voltage and frequency, thereby improving usability and applicability.
Implementation Method 1
A first DC voltage generated by a power source is converted into a second DC voltage by the voltage conversion module
Implementation Method 2
The switching module is electrically connected with the voltage conversion module and the piezoelectric actuator, converting the second DC voltage into an AC voltage so as to drive the piezoelectric actuator
Implementation Method 3
a piezoelectric actuator of the piezoelectric pump... The switching module is electrically connected with the voltage conversion module and the piezoelectric actuator, converting the second DC voltage into an AC voltage so as to drive the piezoelectric actuator
Implementation Method 4
the gas pressure sensor is configured to detect a gas pressure of the piezoelectric pump and accordingly generate a detected gas pressure value
Data Source
AI summary
A driving system includes a voltage conversion module, a switching module, a detecting module, a voltage dividing module and a microcontroller. The voltage conversion module converts a first DC voltage into a second DC voltage. The switching module converts the second DC voltage into an AC voltage so as to drive a piezoelectric actuator of a piezoelectric pump. The detecting module includes a feedback circuit and a gas pressure sensor, wherein the feedback circuit detects an electric power reference value of the switching module, and the gas pressure sensor detects the gas pressure value of the piezoelectric pump. The microcontroller acquires a working frequency according to the electric power reference value so as to operate the piezoelectric actuator at the working frequency. The microcontroller controls the voltage conversion module to adjust the output voltage. Consequently, a gas pressure in the piezoelectric pump is correspondingly adjusted.