关键词: 旋转变压器, 解码系统, 功能安全, 电路设计, DSADC

Abstract: Aiming at the high price of resolver decoding chip and the difficulty of conventional software decoding system to meet the high level functional safety requirements, a decoding scheme which could meet the functional safety requirements without using hardware decoding chip was proposed. A redundant feedback signal conditioning circuit was designed on the hardware, and the signals were sampled by DSADC and VADC respectively. In addition, excitation
overcurrent self-protection circuit and excitation waveform monitoring circuit were designed to reduce single point failure and common cause failure. The decoder circuit was made into PCBA for functional experiments. The results show that the decoder system could not only output the rotor speed accurately in real time, but also meet the requirements of automobile functional safety.

Key words: resolver, decoding system, functional safety, circuit design, DSADC