Micro Piezoelectric Pump Noise Reduction via Frequency Ramp
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Solution Overview
Problem
Current micro piezoelectric pumps generate noise when switched on and off, particularly in intermittent operations, which can disrupt daily life, especially affecting sleep quality due to frequent on-off cycles.
Innovation Solution
A micro piezoelectric pump module incorporating a microprocessor, driving element, and piezoelectric pump, where the microprocessor outputs modulating and control signals to adjust the driving voltage and frequency, allowing the pump to start and stop smoothly, reducing noise by gradually adjusting voltage and frequency to optimal actuation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the micro piezoelectric pump is operated intermittently with frequent on-off cycles, then the sampling frequency can be increased, but noise is generated during switching that disrupts daily life and affects sleep quality
Solution Approach 1:
Before the pump starts operating, the driving frequency is gradually increased from a low frequency to the target actuation frequency. Before the pump stops operating, the driving frequency is gradually decreased from the actuation frequency to a low frequency. This preliminary frequency adjustment prevents sudden noise generation during switching operations.
Solution Approach 2:
The driving frequency is made dynamically adjustable rather than fixed. The microprocessor controls the driving element to vary the frequency over time - increasing it gradually during startup and decreasing it gradually during shutdown. This dynamic frequency control allows the pump to operate efficiently at the actuation frequency while minimizing noise during transitions.
2Adaptability or versatility
If the pump is switched on and off frequently for intermittent operation, then the device can be used more flexibly, but the noise from switching operations increases and interferes with user experience
Solution Approach 1:
The system performs preliminary frequency adjustment before the pump becomes fully operational and after it stops. During startup, the frequency is gradually increased to the actuation frequency before full operation begins. During shutdown, the frequency is gradually decreased before operation completely stops. This ensures the pump can be switched on and off flexibly without generating disruptive noise.
3Productivity
If the pump operates at full power immediately upon switching on, then the transmission efficiency is maximized, but noise is generated during the on-off cycles
Solution Approach 1:
Before the pump operates at full power, the driving frequency is gradually increased to the actuation frequency. This preliminary frequency ramp-up allows the pump to reach optimal operating conditions smoothly without sudden noise generation, after which full power operation can commence for efficient fluid transmission.
Solution Approach 2:
The driving frequency is dynamically controlled to transition smoothly between low frequency and actuation frequency. During startup, frequency increases gradually; during shutdown, frequency decreases gradually. This dynamic control maintains transmission efficiency at the actuation frequency while minimizing noise during transitions to and from full power 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
The solution effectively reduces noise during on-off cycles while maintaining high transmission efficiency by gradually adjusting the driving voltage and frequency, ensuring the pump operates efficiently and quietly.
Implementation Method 1
A driving voltage is applied to the piezoelectric element 201 of the micro piezoelectric pump 200, and then the piezoelectric element 201 is deformed due to the piezoelectric effect
Data Source
AI summary
A micro piezoelectric pump module includes a microprocessor, a driving element, and a piezoelectric pump. The driving element is connected to the microprocessor to receive a modulating signal and a control signal and to output a driving signal. The driving signal includes a driving voltage and a driving frequency. The piezoelectric pump is actuated by the driving signal, and the piezoelectric pump is set to be actuated at an actuation frequency and be applied with an actuation voltage value. The microprocessor drives the driving element to output the driving voltage having an initial voltage value at the driving frequency to the piezoelectric pump, and adjusts the driving frequency to the same with the actuation frequency. After the driving frequency is adjusted to reach the actuation frequency, the microprocessor drives the driving element to gradually increase the initial voltage value to reach the actuation voltage value.