基于单片机的双极性单相SPWM逆变器模拟装置设计论文.doc

PAGE I 基于单片机的双极性单相SPWM逆变器模拟装置设计 A design of the bipolar single-phase SPWM inverter simulation device based on the microprocessor 摘要 本系统以PIC16F877A单片机为核心，利用面积等效法生成SPWM信号。系统主要由隔离变压器和调压器将交流220V电源变成可调交流电源，再整流变换成直流电，SPWM信号通过光耦合隔离器控制由四个功率MOEFET管组成的逆变器的工作状态，逆变器输出频率和幅度都可调的正弦交流电。该逆变电源输出的正弦交流电精度高，性能稳定，实用价值高，在电力电子技术中应用广泛。 关键词：SPWM；逆变器；驱动电路 Abstract This system is based on the microprocessor PIC16F877A, and is made use of the equivalent of area to generate SPWM signal. The system is mainly composed of a isolated transformer and a booster by which the AC 220V power is transformed to an adjustable AC power. This AC power is rectified into DC. The working status of the inverter composed of four power MOEFET are controlled by the SPWM signal through four photo-couplers. The inverter outputs a sine AC power which frequency and amplitude is adjustable. And the output of the inverter power has the advantages of high accuracy, stability, and Key words: SPWM; inverter; Drive circuit 目 录 PAGE 1 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc314325622 摘要 PAGEREF _Toc314325622 \h I HYPERLINK \l _Toc314325623 Abstract PAGEREF _Toc314325623 \h I HYPERLINK \l _Toc314325624 1.引言 PAGEREF _Toc314325624 \h 1 HYPERLINK \l _Toc314325625 2.逆变电路 PAGEREF _Toc314325625 \h 1 HYPERLINK \l _Toc314325626 2.1逆变电路的基本工作原理[5] PAGEREF _Toc314325626 \h 1 HYPERLINK \l _Toc314325627 2.2 PWM技术基础 PAGEREF _Toc314325627 \h 2 HYPERLINK \l _Toc314325628 2.3.1面积等效的SPWM控制算法 PAGEREF _Toc314325628 \h 2 HYPERLINK \l _Toc314325629 2.3.2 SPWM调制方法 PAGEREF _Toc314325629 \h 3 HYPERLINK \l _Toc314325630 3.系统设计 PAGEREF _Toc314325630 \h 4 HYPERLINK \l _Toc314325631 3.1设计方案 PAGEREF _Toc314325631 \h 4 HYPERLINK \l _Toc314325632 3.2设计要求及思路 PAGEREF _Toc314325632 \h 4 HYPERLINK \l _Toc314325633 4.硬件设计 PAGEREF _Toc314325633 \h 5 HYPERLINK \l _Toc314325634 4.1主电路设计 PAGEREF _Toc314325634 \h 5 HYPERLINK \l _Toc314325635 4.2驱动电路设计 PAGEREF _Toc314325635 \h 6 HYPERLINK \l _Toc314325636 4.3自举电路设计 PAGEREF _Toc314325636 \