一种数字模拟混合控制的单位功率因数整流器

Unity Power Factor PWM Rectifier Based on Digital and Analog Hybrid Control

在三相电压型脉宽调制 (PWM)整流器数学模型的基础上 ,以传递函数形式建立了电流环和电压环的数学模型 ,分析了输出电压的限制条件 ,设计了以单片微处理器 80 C552为核心的实验系统 .该系统采用数字模拟混合控制方式 ,无乘法器 ,仅需两个电流传感器 ,从而使系统得以简化 .实验结果表明 ,采用文中所述控制策略的 PWM整流器能使输入电流为正弦且与电压同相 。

On the base of the model of 3-phase PWM rectifier, the model of current loop and voltage loop was set up. The limited range for the DC output voltage was analyzed. The unity power factor PWM rectifier based on digital and analog hybrid control was designed. The microprocessor (80C552) was adopted in the experimental system as central unit. Only two current detectors and no multipliers are required, so that the structure is very simple. The experimental results show that the proposed rectifier can keep the input current in the same phase with voltage and have the unity power factor.