内高频环逆变器的设计

Design of on high-power inverter with overload protection

本文主要研究了一种比较简单的正弦输出的逆变器的设计。本设计采用全桥逆变电路和用推挽升压的方式获得逆变器的直流输入电压的设计方法来获得较大的输出功率和较高的功率因数.在直流升压过程中用PWM集成控制器输出相位相反具有一定占空比的两高频脉冲电压来控制开关管的导通与关断,进而控制推挽升压变压器的输出直流电压,再利用SPWM调制信号控制逆变器开关管的导通与关断,再用LC滤波滤掉逆变器输出高频部分,得到正弦波形,最后利用保护控制电路使逆变输出一个稳定的满足要求的交流波形。

This paper presents a way to design a simple sine output inverter.The principles of Full-Bridge Inverter and Push- Pull Boost are used to obtain high output power and high power factor. In the process of DC step-up, Push-Pull step-up transformer is controlled to export DC voltage when the switches are modulated to turn-on and turn-off by the Integrated PWM Controller which can generates two high-frequency pulse voltages with converse phases and a certain duty circle, in this way, it can easily provide a steady DC input voltage to inverter and meet the requirements of high current output of the inverter, meanwhile, output power of the inverter is increased. Under the SPWM modulation, the switches will be modulated in on and off, then, sine wave appears as the high frequency part has been filtered out by LC filter. Finally, by taking using of technology of control loop, we can get a stable AC waveform that satisfies the conditions.