Piezoelectric Pump Driving System with Dynamic Voltage and Frequency Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional driving systems for piezoelectric pumps face challenges in precisely controlling performance and output flowrate due to varying characteristics among different pumps, leading to poor compatibility, potential damage, and limited applicability, as they often provide fixed voltage or frequency, which do not account for individual pump optimizations.
Innovation Solution
A driving system that includes a voltage conversion module, frequency control module, voltage switching module, and detecting module to adjust both output voltage and working frequency of the piezoelectric actuator, using a microcontroller and gas pressure sensor to optimize operation based on detected gas pressure changes and resonant frequencies.
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 structure, size, and thickness
Solution Approach 1:
The driving system dynamically adjusts both the output voltage and working frequency based on the specific characteristics of each piezoelectric pump. The system includes a frequency adjustment module that varies the working frequency and a voltage adjustment module that varies the output voltage, allowing each pump to operate at its optimal parameters rather than using fixed values for all pumps.
Solution Approach 2:
The system changes the electrical parameters (voltage and frequency) to match the physical characteristics of different piezoelectric pumps. By measuring or pre-determining parameters such as thickness, size, and structure of each pump, the driving system adjusts the output voltage and working frequency accordingly to achieve precise control of performance and output flowrate.
2Adaptability or versatility
If a variable output voltage and fixed working frequency are provided, then the output voltage can be adjusted for different pumps, but the system has poor compatibility because it cannot operate different types of piezoelectric pumps at their optimal working frequencies
Solution Approach 1:
The driving system dynamically adjusts both the working frequency and output voltage based on the specific characteristics of each piezoelectric pump. The frequency adjustment module allows the system to operate different types of pumps at their respective optimal frequencies (e.g., 100 kHz, 105 kHz, 95 kHz), while the voltage adjustment module ensures appropriate voltage levels are provided, preventing damage from excessive voltage.
3Adaptability or versatility
If a fixed output voltage and variable working frequency are provided, then the working frequency can be adjusted for different pumps, but the performance of the piezoelectric pump increases or decreases abruptly and the range of controllable working frequency is narrowed
Solution Approach 1:
The driving system dynamically adjusts both working frequency and output voltage in a coordinated manner. The frequency adjustment module varies the working frequency within a wide range, while the voltage adjustment module simultaneously modifies the output voltage to compensate for abrupt performance changes, ensuring stable and smooth operation across the entire controllable frequency range.
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, avoids damage by optimizing voltage and frequency for each piezoelectric pump, and enhances compatibility across different types, ensuring efficient operation and increased applicability.
Implementation Method 1
a driving system provides electric energy to drive a piezoelectric actuator of the piezoelectric pump. Consequently, the piezoelectric actuator performs a cyclic action to drive the operation of the piezoelectric pump
Implementation Method 2
The frequency control module searches a resonant working frequency of the piezoelectric actuator through circuit oscillation and accordingly generates a switching signal
Data Source
AI summary
A driving system includes a voltage conversion module, a frequency control module, a voltage switching module and a detecting module. The voltage conversion module is used for converting a first DC voltage into a second DC voltage. The frequency control module searches a resonant working frequency of a piezoelectric actuator through circuit oscillation and generates a switching signal according to the resonant working frequency. According to the switching signal, the voltage switching module converts the second DC voltage into an AC voltage so as to drive the piezoelectric actuator. The detecting module includes a gas pressure sensor and a microcontroller. The gas pressure sensor generates a detected gas pressure value according to a result of detecting a gas pressure of the piezoelectric pump. The microcontroller controls the voltage conversion module to adjust the output voltage. Consequently, the gas pressure of the piezoelectric pump is adjusted.