基于FPGA生成PWM波的实现

Realise of PWM-generating based on FPGA

SSRF数字化电源均采用PWM波反馈作用到功率器件上的电源控制器,得到高精度、高稳定度的恒流电源。在FPGA中设计PWM波形生成结构,有利于提高控制器集成化。减少IC器件的使用,可减少器件间的噪声互扰,得到性能更优的电源控制器。此外,可反复编程,得到最优结构的设计,最大化地发挥出FPGA的优势,为实现DSP功能移植至FPGA作了可行性验证。本文介绍SSRF在这方面的进展。

The power supply digital controllers of Shanghai Synchrotron Radiation Facility （SSRF） make use of the PWM （pulse width modulation） wave as the feedback to the power-electrical devices, so as to obtain constant current of high accuracy and stability. The design of PWM wave generation structure in FPGA is good for a compact controller, and the reduction of the usage of Integrated Circuits （ICs） decreases the interference from the noise among the ICs, hence better performance of the controller. In addition, FPGA can be programmed circularly at any time, so as to optimize the structure design and make a maximum use of the advantage of FPGA. As a part of transplanting the complete function of the DSP （digital signal processor/processing）, realizing the generation of PWM wave in FPGA is feasible. In this paper, we report progress in this regard at SSRF.