Piezoelectric Pump Driving Circuit Shared Frequency Control
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Solution Overview
Problem
In pump devices with multiple piezoelectric pumps, individual driving circuits lead to increased size, unstable operation, and noise due to interfering frequencies, and result in suboptimal flow rates.
Innovation Solution
A shared driving circuit is used to operate two piezoelectric pumps at different frequencies, with the driving frequency set to maximize current flow and impedance within specific thresholds, allowing for higher combined flow rates and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual driving circuits are provided for each piezoelectric pump, then each pump can be driven at its optimal frequency, but the device size increases and driving frequencies interfere with each other causing unstable operation and noise
Solution Approach 1:
Multiple driving circuits are merged into a single shared driving circuit that can simultaneously drive multiple piezoelectric pumps. The driving circuit includes a plurality of driving signals generation units that generate driving signals at different frequencies, and a signal selection unit that selects and outputs the appropriate driving signal to each piezoelectric pump, thereby eliminating the need for separate driving circuits for each pump while maintaining stable operation.
Solution Approach 2:
The driving circuit is designed with multi-functionality to serve multiple piezoelectric pumps simultaneously. Each driving signals generation unit can generate driving signals at different frequencies, and the signal selection unit can dynamically select and switch between different driving signals, allowing a single driving circuit to perform the function of multiple separate driving circuits while reducing device size and preventing frequency interference.
2Ease of operation
If individual driving circuits are provided for each piezoelectric pump, then each pump can be independently controlled, but driving frequencies interfere with each other generating noise and unstable operation
Solution Approach 1:
The driving circuit is segmented into multiple driving signals generation units, where each unit is responsible for generating driving signals at specific frequencies for individual piezoelectric pumps. This segmentation allows each pump to be independently controlled while the signals are generated in isolated units, preventing frequency interference and noise generation that would occur with a single unified driving circuit.
Solution Approach 2:
The signal selection unit acts as an intermediary between the multiple driving signals generation units and the piezoelectric pumps. It receives driving signals from different generation units, selects the appropriate signal for each pump, and outputs the selected signal, thereby enabling independent control of each pump while preventing direct frequency interference between them.
3Productivity
If multiple piezoelectric pumps are included to achieve higher flow rate, then the flow rate increases, but the device size increases due to multiple driving circuits
Solution Approach 1:
Multiple driving circuits are merged into a single shared driving circuit that can simultaneously drive multiple piezoelectric pumps. This merging allows the system to maintain high flow rate capability achieved by having multiple pumps while significantly reducing the device size by eliminating redundant driving circuit components.
Solution Approach 2:
The driving circuit is designed with multi-functionality to serve multiple piezoelectric pumps simultaneously through a single circuit. The circuit includes multiple driving signals generation units and a signal selection unit that can dynamically allocate driving signals to different pumps, enabling one driving circuit to perform the work of multiple separate circuits while maintaining high productivity through multiple pumps.
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 configuration achieves higher flow rates and reduced noise by optimizing the driving frequency and impedance, while minimizing the size increase associated with multiple pumps.
Implementation Method 1
a plurality of piezoelectric pumps (21, 22)
Data Source
AI summary
A pump device includes a piezoelectric pump, a piezoelectric pump, and a driving circuit. The piezoelectric pump is driven at a first frequency when singly driven. The piezoelectric pump is driven at a second frequency when singly driven. The driving circuit drives the piezoelectric pump and the piezoelectric pump at the same driving frequency.