Design and implementation of an FPGA-based 3-phase sinusoidal PWM VVVF controller

Abstract

This paper presents a novel single-chip IC (integrated circuit) realization of the 3-phase sinusoidal PWM (SPWM) variable-voltage variable-frequency (VVVF) controller with constant u/f ratio. The controller's outputs, such as fundamental voltage, frequency, dead time and so on, are controlled by several input clocks' frequency. With an EDA (electronic design automation) methodology, the control IC is implemented using only one single advanced FPGA from Altera, Inc. The basis of the proposed scheme is a modified single-edge sinusoidal PWM technology developed from synchronized asymmetric regular-sampled method and dual-edge modulation principle. The controller can give a fundamental frequency output up to 2 kHz or more, and its' switching frequency can be set 30 kHz. The dead time for the IGBT is arbitrarily adjustable. Thus it can be used for high-performance VVVF AC drives and switching power supplies independently or with other processors. Further more, the design can be converted into a soft IP (intellectual property) core for other purposes. Simulation and experimental results are given in this article to verify the constructed controller.