Performance of piezoelectric micropumps actuated by charge recovery

Biancuzzi, Giovanni; Lemke, Thomas; Woias, Peter; Ruthmann, O.; Schrag, H. J.; Vodermayer, Bernhard; Schmid, Thomas; Goldschmidtboeing, Frank

doi:10.1016/j.proche.2009.07.174

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…As seen in Figure 5 , a lower frequency range (0.1–75 Hz) has high fluidic ripples when compared to a higher frequency range. Therefore, working at higher driving frequencies is advantageous to achieve low ripple factors, but at the cost of increased system power consumption [ 43 ] and decreased efficiency in terms of the check valves [ 44 ]. As a result, the flow rate starts to drop significantly.…”

Section: Resultsmentioning

confidence: 99%

Flow Ripple Reduction in Reciprocating Pumps by Multi-Phase Rectification

Özkayar,

Wang,

Lötters

et al. 2023

Sensors

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Reciprocating piezoelectric micropumps enable miniaturization in microfluidics for lab-on-a-chip applications such as organs-on-chips (OoC). However, achieving a steady flow when using these micropumps is a significant challenge because of flow ripples in the displaced liquid, especially at low frequencies or low flow rates (<50 µL/min). Although dampers are widely used for reducing ripples in a flow, their efficiency depends on the driving frequency of the pump. Here, we investigated multi-phase rectification as an approach to minimize ripples at low flow rates by connecting piezoelectric micropumps in parallel. The efficiency in ripple reduction was evaluated with an increasing number (n) of pumps connected in parallel, each actuated by an alternating voltage waveform with a phase difference of 2π/n (called multi-phase rectification) at a chosen frequency. We introduce a fluidic ripple factor (), which is the ratio of the root mean square () value of the fluctuations present in the rectified output to the average fluctuation-free value of the discharge flow, as a metric to express the quality of the flow. The fluidic ripple factor was reduced by more than 90% by using three-phase rectification when compared to one-phase rectification in the 2–60 μL/min flow rate range. Analytical equations to estimate the fluidic ripple factor for a chosen number of pumps connected in parallel are presented, and we experimentally confirmed up to four pumps. The analysis shown can be used to design a frequency-independent multi-phase fluid rectifier to the desired ripple level in a flow for reciprocating pumps.

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Section: Resultsmentioning

confidence: 99%

Flow Ripple Reduction in Reciprocating Pumps by Multi-Phase Rectification

Özkayar,

Wang,

Lötters

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…There are many kinds of operation sequences, such as three-phase, four-phase, and six-phase, presented in Refs. [11,13,[15][16][17]21,23]. To obtain high performance flow rates, a fourphase actuation sequence is chosen to drive the PZT micropump in this study [6].…”

Section: Actuated Sequence Of Peristaltic Micropumpmentioning

confidence: 99%

“…This method theoretically acquires higher efficiency, however, a drawback is the need for physically large inductors. Using high frequency switching converters can overcome this drawback, but increases the complexity of the driving circuit [17]. This paper presents a new driving circuit of PZT which uses an improved differential amplifier and storage capacitors to store and return the charge.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of charge-recovery driving circuits for portable peristaltic micropumps with piezoelectric actuators

Chao

Huang

Chen

et al. 2011

Sensors and Actuators A: Physical

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“…The charge recovery strategy can theoretically recover all the energy of the piezoelectric element and greatly improve the energy recovery efficiency of the circuit. Biancuzzi [32,33] proposed not only an inductor-based circuit capable of voltage inversion across the actuator without additional negative voltage sources, but also a direct switch alternative concept using small chip inductors. Xu et al [34] designed and implemented a miniaturized, lightweight circuit topology with an efficiency of 84.6%, indicating that the circuit can be applied to micro mobile robots driven by piezoelectric actuators.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of Charge Recovery for Piezoelectric Fan

Zhen-wei

Wei

et al. 2022

Actuators

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The piezoelectric (PE) fan is widely adopted in the field of microelectronics cooling due to its advantages of high reliability and good heat dissipation characteristics. However, PE fans driven by conventional circuits suffer from plenty of energy loss. To save energy, we propose an inductor-based charge recovery method and apply it to the driving circuit for the PE fan. Two inductor-based driving circuits, a single inductor-based driving (SID) circuit and a double inductor-based driving (DID) circuit are compared. The SID circuit has a simple structure and a slightly higher energy-saving rate, while the DID circuit introduces no additional oscillations and is more stable. The experimental results show that when the supply voltage changes, both circuits have a relatively stable energy-saving rate, which is about 30% for the SID circuit and 28% for the DID circuit. Moreover, the proposed circuits enjoy the same driving capacity as the conventional circuit, and the driven fan has the same cooling performance.

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Performance of piezoelectric micropumps actuated by charge recovery

Cited by 5 publications

References 2 publications

Flow Ripple Reduction in Reciprocating Pumps by Multi-Phase Rectification

Flow Ripple Reduction in Reciprocating Pumps by Multi-Phase Rectification

Design and analysis of charge-recovery driving circuits for portable peristaltic micropumps with piezoelectric actuators

Design and Experimental Analysis of Charge Recovery for Piezoelectric Fan

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