针对旋转变压器励磁电流峰值控制对高精度的需求,设计并实现了基于分布式延迟锁相环(DLL)时序控制的高精度励磁电流峰值控制系统。通过在芯片中集成7档低失调高带宽可编程增益放大器(PGA)、13位基于混合时序逻辑的逐次逼近型模数转换器(SAR ADC)、采用双极调制架构的12位数字正弦脉宽调制(SPWM)模块以及3组DLL时序控制电路,构建了完整的闭环励磁电流控制系统,实现了对励磁电流峰值的精确采样与动态调节。实验结果表明,本设计输出的PWM波形具有1.3 ns的分辨率,能够在400 mA目标电流下实现励磁电流峰值误差小于±0.934%,为旋转变压器励磁电流峰值控制问题提供了一个有效的解决方案。

To address the high-precision requirements for resolver excitation current peak control, this paper designs and implements a high-precision excitation current peak control system based on distributed Delay-Locked Loop (DLL) timing control. By integrating a 7-stage low-offset, high-bandwidth Programmable Gain Amplifier (PGA), a 13-bit hybrid-timing-logic-based Successive Approximation Register Analog-to-Digital Converter (SAR ADC), a 12-bit digital Sinusoidal Pulse Width Modulation (SPWM) module employing a bipolar modulation architecture, and three sets of DLL timing control circuits on-chip, a complete closed-loop excitation current control system is constructed. This system achieves precise sampling and dynamic adjustment of the excitation current peak. The experimental results demonstrate that the designed PWM waveform output achieves a resolution of 1.3 ns and an excitation current peak error of less than ±0.934% at a target current of 400 mA, providing an effective solution for resolver excitation current peak control.