SPWM变频器设计

文档编号:DQ221   文档字数:10757,页数:26

摘要：随着电力电子技术和微机控制技术的飞速发展和人们对交流电机调速方法的研究的不断深入，直流调速逐步被交流调速所取代。在现有的交流电动机调速方法中，变频调速受到人们的普遍关注，已经在很多领域得到了应用，在我国也被列为重点的技术推广项目。
 电压型正弦脉宽调制（SPWM）变频器以其独有的技术优势而得到快速的发展和广泛应用。先进的控制策略，高性能的控制芯片，智能化高速开关器件相结合成为现代交流调速技术发展的主流趋势。数字方法在可靠性、灵活性、可控性等方面具有模拟方法无法比拟的优越性。目前，市场上相继推出的数字式SPWM变频器中，大多数都采用了专用SPWM芯片。虽然，可使编程简单，但这些器件往往价格高昂，增加了硬件成本。
 鉴于此，本设计中的变频器采用Microchip推出的电机专用8位微控制器PIC16F767构成数字化变频器，通过编程产生驱动信号SPWM波，大大简化了用于产生PWM波形的软件和硬件，使系统简化，同时提高了其动、静态性能。
关键词： 变频调速； SPWM； 电机； PIC16F767

Abstract:With the power electronics and microcomputer control technology and the rapid development of the people of AC motor speed control of the in-depth study DC Speed exchanges were gradually replaced by the governor. The existing AC motor speed control methods, VVVF by people's attention, In many areas has been used in China have been listed as a key project to promote the technology. - Sinusoidal voltage pulse width modulation (SPWM) converter with unique advantages in technology and the rapid development and wide application. Advanced control strategies, the control of high-performance chips, intelligent high-speed switching devices combining modern AC trend of the mainstream of development. Digital methods in terms of reliability, flexibility, controllability, and other aspects simulation method unmatched superiority. Currently, the market has introduced a digital INVERTER; most have adopted a special SPWM chip. Although the program will enable simple, but these devices are often expensive and increase the cost of hardware.
Because of this, The design of the inverter using Microchip introduced the Motor exclusive eight PIC16F76 microcontroller 7 a digital converter, have driven through programming SPWM signal, greatly simplified for the purpose of generating a PWM waveform software and hardware, allowing the system to simplify and improve their static and dynamic properties.
Keywords： frequency speed control； SPWM； electrical machine；PIC16F767

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