The Renewable energy system, electric vehicle, and telecommunication applications require relatively stable power converters with a high gain and enhanced noise immunity. A study of three different types of current-mode controllers for high-gain ultra-lift Luo-converter (ULC) is discussed in this paper. The stability of a constant frequency peak current-mode controller (PCM), an average current-mode controller (ACM) and a variable frequency hysteresis current-mode controller (HCM) are analyzed based on small-signal characteristics. Using mathematical modeling of the controllers, the closed-loop transfer functions such as control voltage to output voltage, current loop gain, inductor current to control voltage, and audio susceptibility are obtained. These transfer functions along with MATLAB simulation results for PCM, ACM and HCM controllers are compared. Then, the component losses of the ULC converter using PCM, ACM and HCM controllers are calculated and an efficiency comparison of different control techniques is done. Investigations of the voltage and current stresses of the switch and diodes are also carried out. Finally, a prototype is fabricated to validate the performance of the converter.

可再生能源系统，电动汽车和电信应用需要具有高增益和增强抗噪能力的相对稳定的功率转换器。本文讨论了三种用于高增益超升Luo转换器（ULC）的电流模式控制器的研究。基于小信号特性，分析了恒定频率峰值电流模式控制器（PCM），平均电流模式控制器（ACM）和可变频率磁滞电流模式控制器（HCM）的稳定性。使用控制器的数学模型，可以获得闭环传递函数，例如控制电压至输出电压，电流环路增益，电感器电流至控制电压以及音频磁化率。这些传递函数以及PCM的MATLAB仿真结果，比较了ACM和HCM控制器。然后，计算使用PCM，ACM和HCM控制器的ULC转换器的组件损耗，并进行不同控制技术的效率比较。还对开关和二极管的电压和电流应力进行了研究。最后，制造了一个原型以验证转换器的性能。