基于DSP的UPS输出电压锁相设计

Design of Software Phase-locked Loop Based on DSP for UPS Application

为了保证UPS的逆变器输出和旁路输出在切换时负载端的输出电压波形不变,UPS的逆变器输出电压和电网电压的频率、相位必须保持一致。针对数字化控制的UPS,研究了采用数字信号处理器(DSP)TMS320F24X实现软件锁相环的设计方法,给出了硬件实现电路及算法框图。实验结果验证了本方法的可行性和有效性。

The output voltage of the inverter in an uninterruptible power supply should be kept in phase with the AC line in order to hold the voltage on the load steady during UPS swapping between inverter and bypass. Design of software phase-locked loop for a digital controller of UPS based on TMS320F24X is proposed in the paper. The implementation of both hardware and software is presented. The experimental results verify the feasibility and validity of the proposed method.