Miniature Piezoelectric Pump Voltage Feedback Control
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Solution Overview
Problem
Miniature piezoelectric pumps face efficiency fluctuations due to unstable operating voltages caused by losses or heat sources, affecting their performance in miniature fluid transportation devices.
Innovation Solution
A miniature piezoelectric pump module with a feedback circuit and microprocessor that adjusts the operating voltage to maintain optimal efficiency by continuously monitoring and regulating the voltage applied to the piezoelectric element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a miniature piezoelectric pump is used for fluid transportation, then the device achieves compact size and portability, but the operating voltage becomes unstable due to losses and heat sources, causing efficiency fluctuations
Solution Approach 1:
The patent implements a feedback control system where a voltage detection circuit continuously monitors the operating voltage of the piezoelectric pump and feeds this information back to a microprocessor. The microprocessor adjusts the drive voltage in real-time based on the detected voltage deviations, ensuring stable operation despite losses and heat generation in the miniature pump structure.
2Productivity
If the operating voltage is increased to improve pump efficiency, then fluid transportation performance improves, but voltage fluctuations and heat generation worsen, reducing reliability
Solution Approach 1:
The feedback control system detects the actual operating voltage and compares it with the ideal voltage level. When voltage drops due to losses, the system compensates by increasing the drive voltage through PWM control, maintaining optimal pump efficiency while accounting for energy losses and heat generation in real-time.
Solution Approach 2:
The patent employs dynamic voltage adjustment through PWM (Pulse Width Modulation) control, where the microprocessor continuously varies the duty cycle of the drive signal based on feedback voltage levels. This dynamic control allows the system to adapt the operating voltage to maintain peak efficiency while compensating for changing loss conditions and heat generation during operation.
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
Ensures consistent and optimal operation of the piezoelectric pump by maintaining the ideal operating voltage, thereby enhancing the efficiency and reliability of fluid transportation in miniature devices.
Implementation Method 1
The piezoelectric element is subjected to deformation due to piezoelectric effect caused by a voltage difference between the first electrode and the second electrode. The deformation of the piezoelectric element is configured to transport fluid.
Data Source
AI summary
A miniature piezoelectric pump module is provided and includes a piezoelectric pump, a microprocessor, a driving component and a feedback circuit. The piezoelectric pump includes two electrodes and a piezoelectric element and has the best efficiency while operating under an ideal operating voltage. The driving component is electrically connected to the microprocessor and the piezoelectric pump and includes a transform element and an inverting element. The transform element outputs an effective operating voltage to the piezoelectric pump. The inverting element controls the two electrodes to receive the effective operating voltage or to be grounded. The piezoelectric element is subjected to deformation for transporting fluid due to piezoelectric effect. The feedback circuit generates a feedback voltage according to the effective operating voltage. The microprocessor adjusts the modulation signal according to the feedback voltage for adjusting the effective operating voltage outputted by the transform element to approach the ideal operating voltage.