本科毕业设计题目：基于单片机的 SPWM 控制系统设计学 院:信息科学与工程学院专 业:学 号:学生姓名:指导老师:日 期:摘 要论文主要目的建立基于单片的 SPWM 调控系统，即用单片机产生 SPWM波，其中，脉冲的宽度按正弦规律变化而和正弦波等效的 PWM 波形称为SPWM 波。本论文中主要是根据 SPWM 法的原理，即通过控制电路中开关器件的通断，使其输出的脉冲电压的面积与所希望输出的正弦波在相应区间内的面积相等，并且在惯性环节上的效果基本相同，从而达到等效的效果。根据这个原理，先利用 MATLAB 计算出基波与载波的交点，计算出交点之间的持续时间，根据持续时间的值在单片机程序中建立一个数组，数组中的元素就是给予定时器的初值，当定时器溢出时，输出电平自动翻转，继而查表，给予下一个电平的持续时间，这样一直反复下去，就可以得到一个 SPWM 波形。最后在 protues 中仿真，在示波器中可以看到 SPWM 波的波形。关键词：单片机； Matlab； 查表； SPWM；仿真AbstractThe main purpose of the paper to establish a SPWM regulatory system based on single chip microcomputer , namely, Using a single chip microcomputer to generates SPWM wave,Among them, the pulse width changed by the law of sine is equal to the sine wave,this PWM wave calls SPWM wave.This paper is mainly based on the principle of SPWM law, namely, the switch-off device in the control circuit is on or off , So that the area of pulse voltage output and the area of the desired output sine wave in the corresponding sections are equal,And the effect on the inertia is substantially same, So as to achieve the equivalent effect, According to this principle, First using MATLAB to calculate the intersection of fundamental and carrier wave, Then calculating the duration between intersections, Based on the value of the duration ,Create an array in the microcontroller program, Elements in the array is initial value assigned to the timer, When the timer overflows, the output level will automatic re...
