基于LM3S-811单相逆变器设计

在此实现了基于LM3S-811的高频逆变器,整个系统包括辅助电源、推挽升压、全桥逆变、SPWM产生、过流保护以及低通滤波等模块。DC 12 V低压直流经过挽推升压转换为高频方波,再经过变压器升压和整流、滤波转化为DC 300 V。推挽模块用SG3525驱动MOSFET得到高压直流电,再经过LM3S-811产生SPWM波驱动全桥逆模块并结合低通滤波、输出过流保护得到工频AC 220 V,输出功率可达240 W。该系统具有体积小、输出稳定等优点。

Design of uniphase inverter based on LM3S-811

The high frequency inverter based on LM3S-811 was realized with the design. The whole system is composed of auxiliary power supply,push-pull booster,full-bridge inverter,SPWM wave generator,over-current protection module,low pass filtering module,etc. 12 V DC is converted into a high frequency square wave by push-pull booster,and then is converted into 300 V DC by transformer boosting,rectification,filtering. SG3525 is used in the push-pull module to drive MOSFET for getting high voltage DC. LM3S-811 is used to produce SPWM wave for driving the full-bridge inversion module,and is com-bined with low pass filtering and output over-current protection to get 220 V AC power frequency. Its output power is up to 240 W. This system has the advantages of small volume and stable output.