Piezoelectric Pump Driving Circuit for Miniaturized Microfluidic Actuation
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Solution Overview
Problem
Existing micro fluid actuators face challenges in reducing the volume of voltage conversion circuit boards, which hinders the miniaturization of fluid transport devices and precise control of flow rates.
Innovation Solution
A driving system for piezoelectric pumps comprising a pump-driving unit, a linear voltage-stabilizing unit, a microcontroller unit, and a current-sensing unit, which generates and adjusts signals to optimize actuation energy and control the actuation current, allowing for precise control of fluid flow and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional voltage conversion circuit boards are used in micro fluid actuators, then the circuit board volume is large, but the device miniaturization is hindered
Solution Approach 1:
The patent integrates multiple circuit functions (voltage conversion, control, sensing) into a single integrated circuit board design, merging previously separate components into one unified structure. This reduces the overall circuit board volume while maintaining all necessary functions for driving the piezoelectric pump and enabling device miniaturization.
Solution Approach 2:
The integrated circuit board is designed to perform multiple functions simultaneously: voltage conversion for the piezoelectric pump, flow rate control through signal generation, and current sensing. This multi-functional design eliminates the need for separate dedicated circuit boards for each function, significantly reducing the overall circuit board volume.
2Measurement precision
If traditional fluid transport devices are used, then the device size is large, but the flow rate control precision is insufficient
Solution Approach 1:
The patent incorporates a current sensing unit that provides feedback signals to the microcontroller unit. This feedback mechanism enables precise monitoring and adjustment of the actuation current, allowing for accurate flow rate control. The closed-loop control system continuously adjusts the piezoelectric pump operation based on actual performance, achieving high precision flow control in a compact device.
Solution Approach 2:
The system uses dynamic signal generation and adjustment capabilities through the microcontroller unit, which can modify drive waveforms in real-time based on feedback. This dynamic control allows the compact piezoelectric pump to achieve precise flow rate control by adapting the actuation parameters, maintaining high precision despite the reduced device size.
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 system enables accurate control of flow rates and reduces the overall volume of the device by optimizing actuation energy and maintaining fluid transmission efficiency, while allowing for precise control of the actuation time and output flow rate.
Implementation Method 1
driving piezoelectric pump
Data Source
AI summary
A driving system for driving piezoelectric pump includes one or more mechanical devices and a driving circuit system electrically connected to the at least one mechanical device. The driving circuit system includes a pump-driving unit, a linear voltage-stabilizing unit, a microcontroller unit, a current-sensing unit, and a connection unit. The microcontroller unit generates a first signal, a second signal, and a third signal, and the pump-driving unit receives these signals to drive the mechanical device. The current-sensing unit receives a fourth signal transmitted by the pump-driving unit to obtain an actuation current value of the mechanical device. The linear voltage-stabilizing unit, the current-sensing unit, and the microcontroller unit are coupled to each other through a fifth signal and a sixth signal. The connection unit and the microcontroller unit are coupled to each other through a reset signal, a seventh signal, and an eighth signal provided by the microcontroller unit.