本文研究了一种单DSP控制“DC/DC直流变换器+DC/AC逆变器”两级变换器,介绍了电路的基本原理,在建立数字控制DC/DC直流变换器和DC/AC逆变器精确模型的基础上设计了两种变换器的控制传递函数,对数字控制的时间延迟对控制性能的影响进行了理论和仿真分析研究。并在500VA28VDC/115V400Hz逆变器样机上进行了实验,对设计电路和控制传递函数设计的有效性进行了验证。
The paper studied "DC/DC converter + DC/AC inverter" two level converter which is controlled by single DSP controller. The principle of the circuit is introduced. The transfer functions of DC/DC converter and DC/AC inverter are designed based on a more accurate model proposed. The influence of digital controller' s control delay is analyzed and simulated. The validity of circuits and control transfer function is verified by the experiment on a 500VA 28VDC/115V 400Hz inverter prototype.