作者：www.nenghua.com.cn 发布日期：2014-08-13 01:13 信息来源：http://www.nenghua.com.cn
实现一种基于Cortex M3的高频链逆变电源。系统由输入欠压保护、推挽升压、全桥逆变、SPWM波产生、低通滤波、输出过流保护、辅助电源等电路组成。12V的直流电通过推挽式变换逆变为高频方波，经高频变压器升压，再整流滤波得到一个稳定的约320V直流电压。前级DC-DC变换采用SG3525驱动MOSFET得到高压直流电，然后通过M3产生的SPWM驱动全桥电路，再经低通滤波得到220V的工频正弦交流电。采用反激式开关电源升压再经稳压芯片稳压供电很好的实现隔离，并且具有输入欠压保护和输出过流保护，输出功率可达100W。该电源体积小、效率高、输出电压稳定，非常适用于车载逆变器。
Abstract This design implements a Cortex M3 based on the high-frequency link inverter power supply.System consists of input undervoltage protection, push-pull boost, full-bridge inverter, SPWM wave generator, low pass filtering, output over-current protection, auxiliary power and other circuit.12V direct current through the push-pull inverter is a high frequency square wave transform, the high-frequency step-up transformer, then rectified and filtered to get a stable DC voltage of about 320V.Former level DC-DC conversion by using SG3525 drive MOSFET high voltage DC and then generate the SPWM drive M3 full bridge circuit, and then low-pass filter obtained by the frequency sinusoidal AC 220V.With a flyback switching power supply step-up regulator chip re-powering through the realization of good isolation, and with input voltage protection and output over-current protection, output power up to 100W.The power, small size, high efficiency, output voltage stability, ideal for automotive inverter.
