Design Of Digital Type PWM Switching Driving Circuit And Construct Of Hardware Architecture For The Active-Passive Vibration Isolation Experiment Platform

According to the development plan of China’s space technology, a manned space laboratory will be built up in the second phase of the manned space engineering. A series of space scientific experiments are carried out, including basic space physics, space materials science, space life science and biotechnology science. The microgravity active vibration isolation system is a support platform which serves for the space science experiment payload with maicrogravity level requierments. Firstly, the vibration information of the experimental payload is measured by displacement sensor and acceleration sensor. Then the controller is used to process the vibration information and send out the corresponding control commands. Finally, the control commands drive the electromagnetic actuator exerts a force on the experimental load to suppress vibration to provide for the protection of the experimental environment for microgravity science experiments. In this background, the following works have been done in this paper:(1) According to the performance requirements of the electromagnetic actuator driving circuit, the digital type PWM (Pulse Width Modulation) switching driving circuit is analyzed and designed by DSP (Signal Processor Digital) chip TMS320F2808-ep, driver chip DRV8432, A/D chip ADS1258-ep and other functional circuits. The digital type PWM switching driving circuit’s programs are written, including PWM generation program, A/D acquisition program, SPI (Serial Peripheral Interface) communication program and PI (Proportional Integral) control program.(2) The digital type PWM switching driving circuit is tested according to the performance requirements of electromagnetic actuator driving circuit. Including: relationship test of input and output, test of output current sensitivity, test of step response, test of current ripple, test of efficiency, test of constant-current characteristic. The test results show:relationship of input and output, output current sensitivity, current ripple, efficiency, constant-current characteristic are satisfied the performance requirements of the electromagnetic actuator driving circuit. But the overshoot of driving circuit is larger. To solve this problem, the circuit needs to be further optimized.(3) According to the vibration isolation functional requirements, the hardware architecture of the acive-passive vibration isolation experiment platform is construced, including:the selection of key components for the active-passive vibration isolation experiment platform, intergral architecture construction and design of partial electronic system. The mechanical design diagram and the physical diagram of the active-passive vibration isolation experiment platform is Given.Finally, a summary has been done for all discussions in the dissertation. The further and more deeply researching works are presented.