Design and implementation of a power supply for MEMS vaporizing liquid microthrusters
Koen Lam (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Mirza Mrahorović (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Henk van Zeijl – Mentor (TU Delft - Electronic Components, Technology and Materials)
Brahim el Mansouri – Graduation committee member (TU Delft - Electronic Components, Technology and Materials)
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Abstract
This thesis presents the design of an accurate current source for MEMS vaporizing liquid microthrusters. An analysis of different power supplies is presented. The design choices leading to the implemented current sink topology is given. The main components, which are an op-amp, a MOSFET and a resistor, are analyzed extensively. System integration tests showed that the current source worked adequately. The current source has also been tested separately and the imposed accuracy requirement is not met. The reason for this has to be further investigated, as there are many potential sources of errors which can cause deviations in the order of microampere. Lastly, several recommendations are given for improving the system.