MINIATURNI KRMILNIK PIEZOELEKTRIČNIH MIKROČRPALK

SMOLE, DEJAN (author), Možek, Matej (mentor)

Piezoelektrične mikročrpalke se pogosto uporabljajo v aplikacijah, kjer je potreben natančen nadzor tlaka in / ali pretoka tekočine, z njimi je lahko izvedeno tudi doziranje. Za doseganje čim boljših izkoristkov je potrebna optimizacija krmilnega signala mikročrpalke. Za optimalno delovanje morajo biti izbrane ustrezna oblika, amplituda ter frekvenca signala. V pričujočem delu je opisan razvoj, izdelava in preizkus miniaturnega računalniško nadzorovanega krmilnega modula mikročrpalk na osnovi integriranega vezja DRV2667 in mikrokrmilnika STM32F103. Opisan je razvoj strojne opreme in razvoj programske opreme modula ter programske opreme na računalniku za krmiljenje. Med razvojem so bili izvedeni nekateri funkcionalni preizkusi krmilnika, kot so meritve porabe električnega toka ter meritve izhodnega signala pri različnih obremenitvah. Poleg končnega krmilnika je bilo izdelano tudi tiskano vezje za integrirano vezje DRV2667, ki omogoča krmiljenje mikročrpalk s poljubnim mikrokrmilnikom preko nizkonapetostnega vmesnika. Za konec je prikazana še uporaba razvitega krmilnega modula v sistemu za avtomatsko karakterizacijo mikročrpalk. Na mikrokrmilniku modula je bil razvit program, ki omogoča tvorbo poljubne oblike in frekvence signala ter skrbi za pošiljanje tega signala integriranemu vezju DRV2667, hkrati pa omogoča tudi komunikacijo ter nastavljanje parametrov delovanja z osebnim računalnikom preko vmesnika USB. Za nadzorni računalnik je bil razvit program, ki omogoča nastavljanje parametrov krmilnika v okolju Windows. Razvite so bile tudi programske knjižnice, ki omogočajo vključitev modula v druge merilne sisteme. Z vgrajeno polnilno baterijo modul lahko deluje kot samostojna naprava. Dimenzije razvitega modula so 25 mm x 50 mm. Modul omogoča tvorbo signalov z vzorčno frekvenco 8 kHz ter amplitudami do 200 Vpp.

• Language: Slovenian
• Keywords: sinteza signala, tvorba signala, piezoelektrične mikročrpalke, krmilnik mikročrpalk, mikrofluidni sistemi, krmilni modul za mikročrpalke, DRV2667
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2015
• PID: 20.500.12556/RUL-30668
• Publication date in RUL: 26.03.2015

Secondary language

• Language: English
• Title: MINIATURE PIEZOELECTRIC MICROPUMP CONTROLLER

Abstract

Piezoelectric micropumps are often used in applications where accurate pressure and / or flow control is needed. They can also be used for dosing applications. For maximizing the performance of a micropump, the optimization of driving signal is needed. Appropriate signal shape, amplitude and frequency for operation need to be determined. In presented thesis, the development of a computer controlled piezoelectric micropump driver module and the test procedures for it are described. The developed driver module is based on DRV2667 integrated circuit and STM32F103 microcontroller. Hardware development as well as development of the module and host computer software are emphasized. During the development, several functional tests were already done, for example measurement of the current consumption and measurement of output signal under different load conditions. In addition to the driver module, a DRV2667 support circuit was developed, which allows a microcontroller to drive a piezoelectric micropump by the means of a low voltage control interface. Finally, the use of the developed controller in a system for automatic calibration of piezoelectric micropumps is demonstrated. Microcontroller software for synthesis of arbitrary shape and frequency signals was developed. The microcontroller sends the signal to DRV2667 integrated circuit while it also supports communication and signal parameter programming using the USB interface. Software libraries were developed for a host computer as well as a Windows program for module control. A miniature piezoelectric micropump driver module was developed and implemented. The module is able to generate a high-voltage arbitrary waveform signal which is suitable for piezoelectric micropump control. The module may be computer controlled or may operate independently as a standalone unit. Module dimensions are 25 mm x 50 mm. It allows for generation of signals with sampling frequency of 8 kHz and amplitudes of up to 200 Vpp. With inbulit battery management section the module may also be used as an autonomous unit.

• Keywords: arbitrary signal synthesis, piezoelectric micropump, micropump driver, microfluidic system, micropump driver module, DRV2667