An Efficient Strategy to Generate High Resolution Three-Phase Pulse Width Modulation Signal Based on Field Programmable Gate Array

Abstract

Abstract-Pulse Width Modulation (PWM) is a common technique used in many different applications.This technique is the heart of the inverter system. This paper reported a modified strategy in asynchronous unipolar sinusoidal PWM (SPWM) switching scheme based on ACEX1K50TC144-3 Altera Field Programmable Gate Array (FPGA). The carrier frequency was designed for 20 kHz and the fundamental frequency was designed to adjust 1 to 100 Hz, with step increase in 1 Hz. A new SPWM signal generation strategy is proposed and compared to traditional SPWM generation technique. The design entry is conducted by Max+plus II version 10.2 through schematic and VHDL programming. The verification in level simulation and hardware realization has been done. As the result, the proposed modified SPWM signal generation strategy works properly and can reduces the usage of logic cell (LC) until 63.75%.Index Terms-Drive, FPGA, inverter, PWM. I. INTRODUCTIONPulse Width Modulation (PWM) has become the facto in industrial standard. PWM is a common technique used in many different applications. This technique is the heart of the inverter system control signal. Up to now, many types of modulating modes have been brought forward in motion control and power conversion, such as sinusoidal PWM, space vector PWM, current tracking PWM, harmonic elimination PWM and so on [1,2,3,4]. These methods have some advantages and disadvantages, but the most widely techniques used are the sinusoidal PWM and the space vector PWM.Most of these PWM techniques are realized by software and motion control Application-Specific Integrated Circuit (ASIC). There are also some analog circuits in ASIC. ASIC is a very good approach to generate PWM signals; its' performance and cost have challengeable advantages. However, their design is limited by semiconductor manufacturers and the users cannot change their functions. The most famous SPWM ASICs include Siemens SLE4520, Marconi MA818, and Phillips HEF4752V. They are successful as the total digital control IC, and they can be used independently as well as incorporated into a microprocessor-based system [5]. But the switching frequency can be up to 1000Hz, so it is only suitable for low speed power devices as BJT and GTO, not for IGBT or MOSFET.Many efforts have been conducted to make strategies of PWM generation in analog or digital domain. The digital PWM generation techniques have successfully eliminated the component drift and tolerance problems associated with earlier analogue implementation. The digital designs based on FPGA have been used successfully in many different electric system applications such as in power converter PWM inverter. Speed performance is considered as an appropriate solution in order to boost the performance of controllers for industrial control systems as an effort to reduce the gap between the analog and digital world [6,7]. Designing a PWM inverter drive using FPGA has several advantages, such as quick, modifiable, and suitable for prototyping.The PWM technique has been the subject of intensive resea...

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