Piezoelectric Pump Driving Circuit with Dynamic Pressure Feedback
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Solution Overview
Problem
Conventional driving circuits for piezoelectric pumps can't precisely control fluid pressure and require additional fluid control valves, increasing costs and complexity, due to fixed voltage and frequency settings that don't account for variations in pump performance.
Innovation Solution
A driving circuit with a power-providing circuit, pressure detector, and control circuit that adjusts the driving voltage based on real-time fluid pressure readings to achieve predetermined inhalation and exhalation pressure values, eliminating the need for additional valves and reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed driving voltage at a fixed frequency is issued to the piezoelectric actuator, then the piezoelectric pump can be easily operated, but the fluid pressure cannot be adjusted as required and different pumps show different driving results due to process variation
Solution Approach 1:
The patent implements dynamic adjustment of the driving voltage magnitude based on real-time fluid pressure feedback. The control circuit continuously monitors fluid pressure and dynamically modifies the driving voltage to maintain optimal pump performance across different operating conditions and pump variations, transforming the static fixed-voltage system into a dynamic adaptive system.
Solution Approach 2:
The patent changes the parameter of driving voltage magnitude dynamically while maintaining fixed frequency. By adjusting the voltage magnitude according to fluid pressure feedback, the system adapts to different pump performances caused by process variation without changing the operating frequency, thus maintaining ease of operation while improving adaptability.
2Manufacturing precision
If an additional fluid control valve is used to adjust fluid pressure, then the specified pressure can be achieved, but the fabricating cost increases and the use life is reduced
Solution Approach 1:
The patent replaces the mechanical fluid control valve with an electrical control system. The control circuit electronically adjusts the driving voltage magnitude to control fluid pressure, substituting the mechanical valve system with an electrical field-based control mechanism, thereby eliminating the need for additional mechanical components.
Solution Approach 2:
The patent implements a self-regulating system where the control circuit automatically monitors fluid pressure and adjusts the driving voltage accordingly. The system serves itself by using feedback from the fluid pressure sensor to autonomously maintain the desired pressure without requiring external mechanical intervention or additional control valves.
3Device complexity
If the driving circuit only controls on/off states and duration, then the circuit is simple, but the fluid pressure cannot be precisely controlled
Solution Approach 1:
The patent introduces a feedback mechanism where the fluid pressure sensor continuously monitors the actual fluid pressure and feeds this information back to the control circuit. The control circuit compares the detected pressure with the target pressure and adjusts the driving voltage magnitude accordingly, implementing a closed-loop control system that achieves precise pressure control.
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
Enables precise control of fluid pressure, reduces manufacturing costs, and minimizes power loss by dynamically adjusting the driving voltage in response to fluid pressure changes during both inhaling and exhaling operations.
Implementation Method 1
a piezoelectric pump comprises a piezoelectric actuator
Implementation Method 2
The pressure detector is connected with the fluid reservoir for detecting a fluid pressure of the fluid within the fluid reservoir in real time
Data Source
AI summary
A control method of a driving circuit is provided for controlling a piezoelectric actuator of a piezoelectric pump to move a fluid of a fluid reservoir. Firstly, a driving voltage is outputted from the driving circuit. Then, a first inhalation adjusting process is implemented while the piezoelectric pump performs an inhaling operation. In the first inhalation adjusting process, a fluid pressure of the fluid within the fluid reservoir is detected and the fluid pressure is adjusted to the first predetermined inhalation pressure value according to the detecting result. Then, a first exhalation adjusting process is performed while the piezoelectric pump performs an exhaling operation. In the first exhalation adjusting process, the fluid pressure is detected and the fluid pressure is adjusted to the first predetermined exhalation pressure value according to the detecting result.