The origin and evolvement of cuk converter are introduced and the voltage and current waveforms of every period are analyzed and presented . the state differential equations of ideal cuk converter are deduced and the simulation models of ideal cuk converter , ac power supply and pulse width modulator ( pwm ) are erected 論文介紹了cuk型dc / dc變換器由來、演變;分析了各個環節、期間的電壓、電流的變化情況及波形;推導了理想cuk變換器的狀態方程;建立了cuk主電路以及相關交流電源、脈沖寬度調制器的simulink仿真模型。
In the positioning servo - system , which generally is configured by the d . c . pulse width modulator ( pwm ) velocity governing system and position servo - loop , the parameter perturbance of pwm velocity loop really exist by reason of such as the load behavior ; power voltage supply ; operating setting value , etc . 1 , 2 , and it cannot be ignored . by using the identification technique to form the mathematical model of the system , authors have confirmed the facts . therefore , to design the discrete sliding mode controller ( dsmc ) of the positioning servo - system , the perturbed parameters value bounds of the pwm velocity loop , which is as the controlled plant of position servo - loop , should be accounted . consequently , the design principle of dsmc for accounting system with parameter perturbance is proposed by the authors . the proposed method can ensure the stability of system with parameter perturbance and the behavior of non - overshoot , fast precise positioning . in order to reveal the effects of the design method , the comparative research work is done by the authors . also , it has been tested in an industrial experiment , the results proved it is satisfactory 由直流脈寬調速系統( pwm )和位置環構成的定位系統中,速度環的參數隨負載特性;電網電壓;給定工況而攝動是不容忽視的.作者通過系統辨識建模也證實了這一事實1 , 2 .因此在設計位置環的離散滑模控制時,必須針對速度環(即位置環的控制對象)的參數攝動范圍采用“對象參數攝動離散滑模控制器的設計方法” ,以確保系統在參數攝動時的穩定性和快速、無超調、準確定位的優良動態品質.為剖析該設計方法的控制效果,本文作了對比性研究,并將該設計方法用于工業試驗中,取得了滿意的結果