Dsp-based High-frequency High Voltage Driver For Deformable Mirrors Power Study

Recent years, adaptive optical technology which could gain high definition images by correcting the atmospheric turbulence, is being used more and more widely in the fields of astronomy, aerospace, military, hospital, communication, etc. And the precise drive of the wave-front corrector is one of the key technologies, while the PZT is one of the most reliable materials to drive deformable mirror (DM) by now.The development of the driving power supply system to get a higher voltage, faster response and lighter weight for the DM is proposed in this thesis, with the background of"the Research on the Theory and Key Technology of the Optical Micro-fluidic Wave-front Corrector", a project of the National Natural Science Fund of China, and a project of an institute.The characteristics and application theories of PZT are analyzed first in this thesis. The open-loop driving method based on exponential waveform and the close-loop driving pattern based on intelligent control algorithm are proposed according to the creeping, hysteresis, and nonlinearity characteristics of PZT. The theories of the direct digital synthesis (DDS) to generate exponential waveform and the Fuzzy adaptive PID algorithm are described in detail.The whole hardware of the PZT driver power supply is divided into two parts, the low voltage part and the high voltage part. The low voltage circuits designed for the open-loop control, close-loop control, human-computer interaction and communications, etc. are well designed, using the DSP (dsPIC30F5011) and the DAC (TLV5619) as the core components. And the method of dual cascade of PA94 is proposed to guarantee the peak-peak voltage up to 600V during the design of the high voltage driving circuits.The software to generate the exponential waveform for the open-loop based on the theory of DDS and the codes for the close-loop control pattern based on the Fuzzy adaptive PID algorithm are designed in C programming language.Simulations and primary experiments carried out in this thesis lead to some key conclusions. This new designed PZT diver power supply for DM has some superiorities, such as high accurate supply voltage, fast frequency response of the open-loop control, high accurate step response of the close-loop control, strong driving capability, easy upgrading, smaller volume, etc. which could satisfy the requests of the project.But there also exits some shortcomings of this system. The voltage of the driver supply could be higher, and the intelligent control algorithm could also be further improved. Therefore, suggestions of improvement for the PZT driver power supply are proposed at the end of the thesis.