基于PIC单片机车载逆变电源逆变器的研究

Investigation on DC-AC inverter used in vehicular inverter based on PIC MCU

介绍了基于PIC单片机的逆变器设计,讨论了控制系统的硬件、软件设计,在实验基础上,从效率、THD和动态特性等方面,重点分析比较了单极性正弦脉宽调制(SPWM)电压平均值反馈控制和双极性SPWM电压瞬时值反馈控制两种方法在车载逆变电源中的应用特点,在理论上分析了两种控制方法输出电压特性的差异,并给出了单极性SPWM电压平均值反馈控制和双极性SPWM电压瞬时值反馈控制的程序流程图。实验结果表明,前者动态特性好,效率较高;后者程序较易实现。

The design of inverter based on PIC MCU was introduced. The design of hardware and software in control system was discussed. The unipolar SPWM inverter with average voltage feedback control loop and the bipolar SPWM inverter with instantaneous feedback voltage control loop were investigated as these methods being applied in vehicular inverter. Based on experimental research results, the analysis and comparison of the two methods were presented in the aspects of efficiency, THD, dynamic performance, etc. The differences of the output voltage, used in the two methods, were presented in theory, and the flow process charts of the two methods were introduced. The results show that the former has a better dynamic characteristics and higher efficiency; the latter is easier to implement.