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

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.