高频感应加热全数字锁相环的分析与FPGA实现

Analysis and Implementation of All-digital Phase-locked Loop in High-frequency Induction Heating Based on FPGA

全数字锁相环存在非线性部件,传递函数难以表达。通过Z域分析法选择合适的参数,分析了触发器型全数字锁相环的工作原理,得出Z域闭环传递函数,并以此研究了锁相环的全局稳定性和稳态误差,提出了各参数的约束条件。采用Xilinx ISim仿真与FPGA逻辑器件验证相结合的方法实现了一种单相全数字锁相环,并给出实验结果。结果表明,该锁相环具有锁相范围宽、动态响应快和稳态误差小的特点,具有一定的应用价值。

The transfer function of all digital phase-locked loop is difficult to obtain because of the non-linear parts. The operation principle of flip-flop all digital phase-locked loop was analyzed and the Z domain closed loop transfer function was obtained by the method of Z domain analysis with proper parameters. The global stability and the steady-state error of the phase-locked loop were studied and the parameter constraints relationship was built. A kind of all digital phase-locked loop was designed by using Xilinx ISim simulation and FPGA logical device,and the experiment results were given. The results show that this all digital phase-locked loop has a wide frequency range,fast dynamic response,small steady-state error and certain application value.