摘要
针对变换器引入前馈控制实现输入电压-输出电压传递函数(音频敏感率)调整为零的方法进行了研究,提出了一种计算前馈控制器时简化变换器模型的方法,从而可以直观地确定与前馈控制器相关的主电路参数。当音频敏感率等于零时,可以实现变换器输出与输入的解耦,对输入噪声实现极大程度的衰减作用,通过输入电压前馈的方法可以实现音频敏感率的调整为零。当变换器模型阶次较高时,调整音频敏感率为零所需的前馈控制器形式较为复杂,所以本文研究了采用比例控制器进行前馈的方法,实现在一定频率范围内变换器输出对输入侧扰动信号的大幅度衰减,并针对双电感和双电容构成的非隔离电流连续型拓扑族给出了对应的前馈控制器与主电路参数之间的关系。通过分析变换器的直流增益特性,揭示了调整音频敏感率为零时变换器所需的前馈控制器比例系数仅与直流增益比相关的规律,并通过理论计算和实验对结论进行了验证。
The method of using feedforward controller to null audio susceptibility, which is the input-output transfer function, has been researched in this paper. A method for simplification of the converter when computing the feedforward controller is presented so that the related components of the circuit can be easily established. When the order of converter＇s model is high, its feedforward controller form is complicated. In this paper, the proportional feedforward controller instead of the accurate form is used to realize zero audio susceptibility in certain frequency range. Besides, the accurate feedforward controllers of continuous current converters with two inductors and two capacitors have been analyzed and it shows that the proportional feedforward controller only depends on the DC gain of the converter. The conclusions have been verified by computation and experiment results.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第10期195-205,共11页
Transactions of China Electrotechnical Society
