Study Of Multi-level Switching-linear Hybrid Piezoelectric Ceramic Driving And Control Method

Main principle of piezoelectric ceramic actuator is the inverse piezoelectric effect. An amplitude controllable external voltage applying to it can control its displacement. Piezoelectric ceramic actuator has a wide range of applications in precision engineering fields such as the ultra-precision positioning systems, microelectronics technology and space technology. Piezoelectric ceramic driving power has high requirements on efficiency, power, output voltage range and linearity. And the current drive power has significant deficiencies in these aspects. Around driver circuit of high voltage, high power, high efficiency and low ripple output, this article carries out the following research work:A multilevel switching-linear hybrid piezoelectric ceramic driving power is designed. The thought that switched multilevel cascaded circuit supply power for linear push-pull amplifier circuit is put forward, and the supplying power is dynamic and adjustable. Under driving of command signal, push-pull amplifier circuit output high voltage of high efficiency, high power and low ripple.A topology of hybrid piezoelectric ceramic driving power circuit is put forward which contains input stage of switched circuit and output stage of linear amplifier circuit. Through 2 dynamic voltages output from switched circuit, power is supplied for linear amplifier circuit, and its working principle is analyzed. Modulation method based on the CPS SPWM with compensation is designed.Dynamic power control strategy of the proposed driving circuit is studied. Under the control strategies, efficiency of push-pull amplifier circuit is analyzed and it is compared with the basic push-pull amplifier circuit. Aimed at improving the working efficiency of the push-pull amplifier circuit, the dynamic power supply strategy is designed and feasibility of the driving circuit and modulation method is verified through the simulation.Design of hybrid piezoelectric ceramic driving power system is completed, and the entire experimental platform of driving power system is set up. The driving power supply circuit and its control strategy is verified through the experimental platform.By the simulation and experiments, the results show that the hybrid piezoelectric ceramic driving power can output high voltage of high power, high efficiency and low ripple. The output voltage is adjustable, and it has good dynamic performance.