Abstract: since zero-crossing detection has negative impact on the problem of stability of digital phase-locked loop, we use the corresponding hardware and software solutions to improve the phase-locked loop's stability in this paper. In terms of hardware, we bring forward the zero-crossing detection to compensate for the phase lag caused by filter. In terms of software, we add a method to judge the authenticity of the zero-crossing, as well as firstly detecting zero-crossing then switching inverter, which effectively avoid errors of zero-crossing detection caused by phase-locked failure, and achieve good results.
关键词：数字锁相环；稳定性；相位补偿；假过零点
Key words: digital phase-locked loop；Stability ；phase compensation； Pseudo-zero-crossing point
