单相正弦波变频电源自动化（本科）毕业论文设计.doc

单相正弦波变频电源 摘要：关键词：升压；场效应管；检测电路；逆变 Abstract:The SPWM signal is produced by the way of analog and digita in the design.The fundamental wave is produced by 89C51 chip,and the sine triangle carrier wave is produced by NE555 chip.SPWM drive signal is generated by the high-speed voltage comparator LM311. The turn-on and turn-off of mosfet are controlled by SPWM drive signal from the shaping circuit, the dead zone circuit, the power am plifier circuit to bring out the required frequency of the sinusoidal alternating current in DC/AC convertion.The voltage regulating circuit uses DC-DC independent voltage regulating to realize, Change the frequence of the sine wave that is the output of the MCU will realize the function of inverse output SPWM AC frequency modulation .Use AD637 to complete voltage and current true effective value transform and then send the result to A/DTLC549. Through AD exchange the output will be send to the MCU to be processed,according to the result to monitor the inverse output and to ensure the stability of the output voltage. The waveform of the output voltage is sine-wave,its frequence can be changed.The voltage and current of the Power source can be e over-current and over-voltage protection circuit, an o-load alarm circuit and smeasured and the result can be displayed on the LCD.The power source include tho on. At the same time use multi-channel isolate Counter type switch power as system power supply. On the basis of research and design,a prototype of principle is produced.the most of debugging of the whole system is completed. Keyword:boost；mosfet；detection circuit；inverter 毕业设计（论文）原创性声明和使用授权说明 原创性声明 本人郑重承诺：所呈交的毕业设计（论文），是我个人在指导教师的指导下进行的研究工作及取得的成果。尽我所知，除文中特别加以标注和致谢的地方外，不包含其他人或组织已经发表或公布过的研究成果，也不包含我为获得 及其它教育机构的学位或学历而使用过的材料。对本研究提供过帮助和做出过贡献的个人或集体，均已在文中作了明确的说明并表示了谢意。 作 者 签 名：　　 　 　　日　 期：　　 　 　　 指导教师签名：　　 　 　　 日　　期：　　 　 　　 使用授权说明 本人完全了解 大学关于收集、保存、使用毕业设计（论文）的规定，即：按照学校要求提交毕业设计（论文）的印刷本和电子版本；学校有权保存毕业设计（论文）的印刷本和电子版，并提供目录检索与阅览服务；学校可