中图分类号：TM383.2 文献标志码：A DOI: 10.16157/j.issn.0258-7998.256789
中文引用格式： 宋建国，李小波，徐自可. 基于三阶角度观测器的旋变软解码系统设计[J]. 电子技术应用，2025，51(11)：71-75.
英文引用格式： Song Jianguo，Li Xiaobo，Xu Zike. Design of resolver software decoding system based on third-order angle observer[J]. Application of Electronic Technique，2025，51(11)：71-75.

Design of resolver software decoding system based on third-order angle observer

Abstract： The electric drive system of new energy vehicles usually uses a resolver to obtain the position of the motor rotor, but its circuit is complex and the chips are expensive, resulting in high costs. The traditional second-order phase-locked loop has steady-state errors when accelerating and tracking the rotor. In actual working conditions, the loss of one phase of the input sine and cosine often leads to resolver faults in the soft ware decoding. For this, an angle observer based on the third-order Angle observer is proposed to improve the position decoding accuracy. Meanwhile, the phase-locked loop algorithm was adopted to track the remaining signal during the decoding fault and recover the lost signal to complete the decoding after the fault. Finally, the feasibility and effectiveness of the algorithm were proved through MATLAB simulation. The DSADC module of Infineon TC387 was adopted for actual verification of the decoding effect. The results show that the system achieves stable tracking of acceleration and can maintain a good decoding effect after the absence of a certain signal.

Key words : resolver；software decoding；angle observer；phase-locked loop