||Study of driving circuits based on boost converter for portable peristaltic micropumps with piezoelectric actuators
||Department of Electrical Engineering
Interleaved boost converter
在生物醫學的應用過程中，壓電蠕動式微幫浦是非常有吸引力的，它需要微小的尺寸以及高度的整合，例如藥物傳輸幫浦。而壓電蠕動式微幫浦所需要的驅動致動器的交流電壓通常在100伏特到200伏特的範圍內由9伏特到24伏特的電池所提供。傳統上，大型的變壓器是用來符合電壓需求並且因此了增加系統的尺寸。此研究發展一個驅動電路系統於蠕動式微幫浦在壓電式驅動器，其中包含了3.7伏特的電池、去耦合電容、升壓電路、驅動電路驅動四個相位，其尺寸為75 mm × 35 mm × 10 mm大小。系統的尺寸和噪音產生比傳統的電路的系統低，而升壓電路可將3.7伏特的電壓升至100伏特。由實驗結果看出此系統用於微幫浦進行去離子水驅動實驗，其工作於200 Vpp 電壓與37.5 Hz頻率下，其壓電片有1.41 μm位移量、及每秒有205.2 μl之流率。在最大流率的情形下，平均功率消耗只有46.3 mW。
Piezoelectric peristaltic micropumps are very attractive in biomedical applications that require small size and high integration, such as drug delivery pumps. The required driving electrical AC voltage for the actuators is typically in the range of 100 V to 200 V, which is far from the 9 to 24 V of batteries. Traditionally, large electromagnetic transformers are used to match the need and increase the size of the system. The study develops a driving circuit system for peristaltic micropumps with piezoelectric actuators. The proposed drive circuit system, with a size of 75 mm × 35 mm × 10 mm, consists of a 3.7 V battery, a decoupling capacitor, an interleaved boost converter, a microcontroller, and a driving circuit with a four-phase actuating sequence. The size and noise generation of the proposed system are lower than those of classical electromagnetic-based systems. An interleaved boost converter capable of converting a 3.7V DC input voltage up to 100 V DC is implemented. Experimental results for the pump show a diaphragm displacement of 1.41 μm, a flow rate of 205.2 μl/min, and a backpressure of 2890.5 Pa with deionized water at 200 Vpp and 37.5 Hz. The maximum flow rate of the optimal condition was obtained at 200 Vpp and 37.5 Hz under an average power consumption of 46.3 mW.
Abstract (in English) II
List of tables VI
List of figures VII
Chapter 1 : Introduction 1
1.1 Background and motivation 1
1.2 Preface of this dissertation 3
Chapter 2 : Actuation principle and circuits of the piezoelectric peristaltic micropump 4
2.1 Piezoelectric peristaltic micropump 4
2.2 Principles of operation sequence 5
2.3 Decoupling capacitor 7
Chapter 3 : Design and analysis of circuits 8
3.1 System architecture 8
3.2 Interleaved boost converter 9
3.2.1 Operation analysis 12
3.2.2 Measurement results 15
3.3 Driving circuit 25
Chapter 4 : Experimental results and discussions with piezoelectric micropumps 29
4.1 Experimental results of the driving circuit 29
4.2 Experimental results of the pump performance 32
4.3 Power consumption of driving system 35
4.4 Lifetime of a battery 36
Chapter 5 Conclusions 37
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32 http://www.powersystems.eetchina.com/ DF/2007AUG/PSCOL_200A