Design Of High Power Piezoelectric Ceramic Stack Digital Drive Power Supply

Piezoelectric ceramic stack is composed of multiple piezoelectric ceramic chip,has small volume,big power,fast response characteristics,research in aerospace,military and other fields has been widely used,Therefore,this paper aims at the application of stacked piezoelectric ceramics in model vibration suppression system,design a high-power piezoelectric ceramic stack digital drive power supply.This paper studies and analyzes the stacked piezoelectric ceramics,lists the related characteristics of the stacked piezoelectric ceramics,analyzes the equivalent circuit model of the stacked piezoelectric ceramics,by comparing the stacked piezoelectric ceramics drive power supply at home and abroad,and according to the stacked piezoelectric ceramics drive mode,According to the design index requirements of this subject,the design scheme is determined and the technical index requirements of the drive power supply are verified experimentally.The main contents are as follows:First,the main hardware circuit of stacked piezoelectric ceramic drive power supply is analyzed and designed,including: multi-channel half-bridge phase shift parallel circuit,soft switch driver analysis and implementation,low-pass filter design,hardware PCB design.The main circuit adopts multi-channel half-bridge phase-shifting parallel driving mode,which greatly increases the power output capacity of the driving power supply,and adopts negative pressure driving mode to improve the safety and stability of SIC FET when working;The design of soft switch driver completes the zero-voltage turn-on and turn-off of SIC FET on the upper half bridge and SIC FET on the lower half bridge,reduces the switching loss of SIC FET and the change rate of output voltage and current,and improves the service life of the switch tube.The design of low pass filter effectively reduces the high harmonics in SPWM signal and reduces the ripple noise output.Finally,in order to reduce the interference of electromagnetic space radiation in high power driving power supply,the PCB of hardware circuit is designed reasonably.Second,the control system hardware of stacked piezoelectric ceramic drive power supply is designed,including core processor circuit and feedback sampling circuit.The hardware of the control system is mainly ZYNQ core processor.Through the PL side of ZYNQ,A/D chip can convert voltage signals and current signals in the feedback sampling circuit at high speed and high precision,so as to realize the closed-loop control system of input and output.At the same time,the PS side of ZYNQ completes the communication interface design of Ethernet.Used to realize communication with external functions.Three,the stacked piezoelectric ceramic drive power supply software design,including the lower computer control program and upper computer interface.In the lower computer control program,the input and output digital signal sampling is realized by A/D driver of ZYNQ’s PL side,and the output duty cycle of digital SPWM is adjusted by PI algorithm calculation of single period based on carrier frequency.The PS side has completed the transplantation of Linux system and the realization of Modbus-TCP communication code.Then the remote monitoring of the piezoelectric ceramic drive power supply is completed in the interface of the host computer,and the networking design of 8 drive power supply is realized based on Modbus-TCP protocol.Through experimental verification,the stacked piezoelectric ceramic driving power supply in this topic in the equivalent capacitance of 5μF piezoelectric ceramic load,the input signal frequency is 10Hz～2000Hz,the driving power output voltage amplitude is 1000 V,the output current amplitude is 20 A,the gain of the output voltage can reach 100 times.It has good linearity output,ripple output and stability output,and all the output indexes meet the design requirements.