一种参数连续平稳可调的1阶等效电路  

First-order Equivalent Circuit with Continuously and Smoothly Adjustable Parameters

作　　者：程森林[1] 代洪海[1] 苏玉刚[1] 叶兆虹[1] 王路稳[1] 

机构地区：[1]重庆大学自动化学院,重庆400044

出　　处：《四川大学学报（工程科学版）》2013年第5期112-116,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51277192)

摘　　要：为解决现有1阶负载电容参数难于实现平稳连续可调问题,设计了一种1阶等效电路。该电路基于PWM控制原理,借助对脉宽占空比的控制,调整有源电路的电流与电压,实现对电路中电容参数的平稳连续调节。分析了该1阶电路的等效性,误差分析表明,随着开关频率的提高,误差逐渐减小。通过实验仿真,对在线连续调节占空比时等效电路与实际电路的阶跃响应曲线进行分析,当开关频率为100 kHz,在占空比δ分别为20%、50%、80%时,最大误差分别为1.598×10-3、2.49×10-3、1.588×10-3,等效曲线与实际曲线几乎是重合的,其误差可忽略不计。仿真实验验证了该1阶等效电路的可行性,为解决1阶负载电容参数难于平稳连续可调提供了一种新思路。Aimed at the puzzle that the first-order load capacitance parameter is difficult to adjust smoothly and continuously,a sort of first-order equivalent circuit was designed to solve the problem. Based on the equivalence on the circuit external characteristics,by means of controlling pulse duty cycle of PWM,through adjusting the current and voltage of the active circuit continuously and smoothly,it could achieve a smooth and continuous adjustment of capacitance parameter. The first-order circuit equivalence was analyzed,and the error analysis showed that,with the increase of switching frequency,the error would be decreased gradually. The comparative study of simulation showed that under the condition of switching frequency being 100 kHz,the duty cycles would respectively be 20%,50% and 80%,the maximum error respectively would be 1. 598 × 10- 3,2.49 ×10- 3and 1. 588 × 10- 3,and the equivalent curve is almost the same with the actual curve. The results also showed that it is feasible for designed first-order equivalent circuit,and it provides a new thought to make first-order load capacitance parameter to be adjusted smoothly and continuously.

关 键 词：1阶负载 等效电路 参数平稳可调 在线连续调节 PWM 

分 类 号：TM133[电气工程—电工理论与新技术] TP273[自动化与计算机技术—检测技术与自动化装置]