High-Performance High-voltage Drive Electronics And Method For Piezoelectric Wavefront Corrector

With the development of Adaptive Optics(AO) and its application, the corresponding increase in diameter of the piezoelectric Fast Steering Mirror(FSM) and actuator count of the Deformable Mirror(DM) in these systems have led to a significant challenge to the high-voltage drive circuit and method. This thesis focuses on highperformance high-voltage drive electronics and method for piezoelectric wavefront corrector. A series of theoretical and experimental researches about the technologies are carried on. The main contents and conclusions are shown in the following:Firstly, the high-performance High-Voltage Drive System(HVDS) for high-order piezoelectric DM in ground-based telescope AO is researched. A significant challenge to operating these thousand-channel piezo DM is related to the HVDS, which are required to be high bandwidth, high output power density and signal quality so as to operate within practical constraints. The main power topologies are reviewed and the limiting characteristics of high bandwidth are identified. A new high-voltage amplifier is proposed that can output thousand bipolar voltage and high power for piezoelectric ceramic load. A HVDS is designed for piezoelectric DM in 4m class ground-based telescope. The development and optimization of the HVDS capable of meeting AO performance criteria and constraints is demonstrated.Secondly,this thesis describes a simple and efficient implantation of multiplexing control for piezoelectric DM in space-based telescope. The drive circuit dynamic model of multiplexing control of piezoelectric DM is investigated; the relation between the multiplexing frequency and the surface displacement error is analyzed, and the maximum update rateis identified by sequential addressing of actuator.A prototype for39-channel piezo DM is designed and tested. This approach can provide for the integration of the DM and its high-voltage driver into a compact package by reducing both power and size which are the critical limitations for space-based applications.Finally, the high-performance HVDS for suppression of piezoelectric fast steering mirror is also researched. An improved dual two-order filter embedded in the HVDS to improve the pointing accuracy and error attenuation capability is proposed. As a whole with the piezoelectric FSM, the optimized frequency response of the HVDS flattens the magnitude response in the region of mechanical resonance. The influence of the proposed dual two-order filter parameters on frequency characteristics is analyzed, andthen, a practical design method is proposed. The new HVDS embedded the proposed dual two-order filter can also be used to suppress the mechanical jitter on platform.Experimental results show that it is simple and effective for the suppression of the mechanical resonance of a piezoelectric FSM and that of the narrowband disturbance,and hence it improves the system error attenuation bandwidth and the beam pointing accuracy.The thesis will contribute to the development of high-performance high-voltage drive system for piezoelectric wavefront corrector.