FPGA based Digital Control with High-Resolution Synchronous DPWM and High-Speed Embedded A/D Converter

Digital control solutions become more attractive than analog controllers because they allow easy design of more complex control strategies, reconfigurability, high immunity to noise and low power consumption. However, as the control target and power stage of the converter are inherently analog, digital controllers require the addition of Analog-to-Digital (A/D) converters. This data conversion generates additional problems derived from time discretization and finite word length effects. Particularly, for applications with high switching frequency and tight output voltage regulation, the limited resolution of the Digital Pulse Width Modulator (DPWM) and the sampling frequency of the A/D converter are important issues. In this paper, a high-resolution synchronous DPWM and a high-speed A/D converter using FPGA resources are proposed and validated in order to obtain a cost-effective implementation.