Modulation Index (MI) variant sinusoidal-pulse-width-modulation (SPWM) is desirable for converter applications in maintaining output voltage under variable input and load environments. Enabling a high-speed switching and resolution, field-programmable gate-arrays (FPGAs) have been dominating in digital control of power electronics. This paper proposes an FPGA-based high-frequency high-resolution digital variable-modulation-indexed sinusoidal-pulse-width-modulation (DVMI-SPWM) generator architecture which can support the requirements of modern high-frequency switching and the MI adjustment ability in voltage-source-inverter (VSI) applications. A mathematically formulated optimized finite-state-machine (FSM) architecture is introduced, which adopts MI of SPWM by adjusting the duty-cycle values of SPWM pulses based on the measured feedback signal. The design employs a minor segment of medium-sized FPGA and, thereby, provides a good trade-off for multi-functional and larger schemes. The post-design simulation and experimental results validate that compared to the earlier-reported architectures, the proposed DVMI-SPWM architecture is the most appropriate one for variable MI applications with improved performance such as lower power consumption, lower harmonic distortion, and higher resolution.

调制指数（MI）可变正弦脉冲宽度调制（SPWM）对于转换器应用是理想的，以在可变输入和负载环境下维持输出电压。为了实现高速开关和分辨率，现场可编程门阵列（FPGA）在电力电子设备的数字控制中占据了主导地位。本文提出了一种基于FPGA的高频高分辨率数字可变调变索引正弦脉冲宽度调制（DVMI-SPWM）发生器架构，该架构可以满足现代高频开关的要求和MI调整能力。电压源逆变器（VSI）应用。介绍了一种数学公式化的优化有限状态机（FSM）架构，该架构采用SPWM的MI，可根据所测得的反馈信号调整SPWM脉冲的占空比值。该设计采用了中型FPGA的一小部分，从而为多功能和大型方案提供了良好的折衷方案。设计后的仿真和实验结果证明，与早期报告的体系结构相比，所提出的DVMI-SPWM体系结构最适合可变MI应用，并具有更高的性能，例如更低的功耗，更低的谐波失真和更高的分辨率。