高效直流12V转交流220V逆变电源设计

目录

摘要 (1)

ABSTRACT............................................................ .. (2)

第一章绪论 (3)

第1.1节逆变器的定义 (3)

第1.2节逆变器主电路的基本形式 (7)

第二章逆变器主电路设计 (7)

第2.1节逆变器主电路比较 (7)

第2.2节逆变电源的系统结构 (11)

第2.3节直流升压电路设计 (12)

第2.4节逆变电路设计 (18)

第三章逆变系统 (20)

第3.1节太阳能逆变电源的设计要求 (20)

第3.2节逆变主电路架构及功能 (20)

第3.3节逆变控制方式 (21)

第3.4节高频变压器设计 (24)

第3.5节输出LC滤波器设计 (29)

第3.6节全桥型逆变主电路元器件参数的确定 (30)

第四章辅助电路、保护电路及系统抗干扰设计 (32)

第4.1节辅助电源设计 (32)

第4.2节保护电路设计 (34)

第4.3节系统的抗干扰技术 (36)

第五章研究总结与展望 (38)

参考文献 (39)

致谢 (40)

高效直流12V转交流220V逆变电源设计

摘要

数字化控制以控制简单、灵活，输出性能更稳定，可以实现模拟控制所不能达到的控制等诸多优势成为电源研究领域的一大热点。

本文介绍了一种以车载高频链逆变电源为模型的逆变器。车载逆变电源可以把汽车蓄电池的12V直流电转变成大多数电器所需要的220V交流电，系统硬件部分主要包括输出电压、直流母线电压、输出电流的采样和处理，PWM驱动信号的驱动电路，输出滤波环节，出于安全性考虑加入了短路、过压、欠压、过载、温度等保护电路。系统软件部分则包括SPWM波的生成，闭环控制，及过载保护等。电路主体逆变方案为-DC(低压)/DC(高压)/AC(高频SPWM脉冲)。该方案虽然有三个功率变换环节，但其原理简单，实现的技术成熟，并且能较好地实现高频链和SPWM逆变器的结合，产生谐波含量低的工频正弦波输出，并用PSPICE对逆变部分进行了仿真，对输出滤波器参数设定和死区效应进行了分析。

本文提出了一种对小功率逆变电源系统的实现方案，并通过仿真和实验结果证明了该系统的可行性，对设计逆变控制系统具有一定的参考价值。

关键词：逆变数字控制正弦脉宽调制滤波

ABSTRACT

Digital control strategy has been employed in study and design of power supply because of the advantages such as smart control method,steady output performance and high control accuracy comparing with analogue control strategy.

Study of a digital control system with single-pole SPWM modulation strategy is employed.Inverter power supplies applied in cars transform from 12V of storage battery DC into 220V AC.The hardware of the system include sampling and processing circuit of output voltage,

direct bus voltage and output current,drive circuit of PWM drive signal,filter circuit of the output voltage,protection circuits including short-circuit protection circuit,over-voltage protection circuit,under-voltage protection circuit and over-temperature protection circuit and so on.The software of the system include the sub-program of generation of SPWM control signal,the sub-program of closed-loop control,the sub-program of over-load protection and so on.The main inversion strategy is DC(low-voltage)/DC(high-voltage)/AC(high-frequency SPWM).Although there are three power conversions in the system,because of the simple principle,mature implementation technology,the system is capable of combining high frequency chain and SPWM inverter and producing 50Hz sinusoidal wave with lower harmonics elements.The PSPICE is employed to make the simulation of the inversion part and the control strategy of microcontroller,the parameters of the output filter and the effect of blank-time are analyzed to meet the requirement.

This paper introduces a digital control strategy of the system of inversion power supply and proves the feasibility of the system by experiments and simulations.So,it's valuable to design the control system of inversion.

KEY WORDS:DC/AC,Digital Control,Sine Pulse Width Modulation （SPWM）,Filter.