基于TMS320F28379D和Σ-Δ调制的旋变软件解算系统

Rotary Transformer Decoding System Based on TMS320F28379D and Σ-Δ Modulator

针对旋转变压器解算困难及专用解算芯片存在二次延时等问题,课题组提出了基于TMS320F28379D的旋变软解算系统。基于旋转变压器与Σ-Δ采样,设计了Σ-Δ与ADC双路采样电路;采用反正切法实现旋变开环解码;采用基于锁相环原理的双精度数字R/D转换电路实现旋变闭环解码。实验结果表明闭环解码相比于开环解码,以极小延迟为代价提高了位置解算精度。旋变软解算系统能实现旋变的精确解码并降低解算延时。

In order to solve the problem of the resolver's difficulty in solving and the second time delay of the special solving chip,a resolver soft solution system based on TMS320 F28379 D was proposed.A dual sampling circuit of Σ-Δ and ADC was designed based on the resolver and the Σ-Δ sampling.The arctangent method was used to realize the resolver open-loop decoding;the double-precision digital R/D conversion circuit based on the phase-locked loop principle was used to realize the resolver closed-loop decoding.The experimental results show that compared with open-loop decoding,closed-loop decoding improves the accuracy of position calculation at the cost of minimal delay.The resolver soft solution system can realize accurate resolver decoding and reduce the solution delay.