This paper introduces a new nonlinear voltage-mode controller for a PWM dc-dc buck converter operating in continuous conduction mode. The sliding-mode control technique is used to derive a simplified equivalent control law based on the averaged dc-dc buck converter dynamics. As opposed to the reported design approaches, the proposed control scheme only requires the output voltage in the feedback loop without the need to the capacitor current. Thus, the analogue implementation cost is reduced and the drawback of adding a capacitor current sensor to the power converter is eliminated. The control equation is realized in a simple analogue circuit using few op-amps and resistors, which is suitable for industrial applications. The system modeling and control design procedure along with the derivation of the existence and stability conditions are presented. The control system performance is analyzed using MATLAB and SaberRD simulations. Furthermore, a simple analogue prototype of the simplified nonlinear voltage-mode controlled dc-dc buck converter is developed on a PCB. The simulation and experimental results show that the controller maintains a constant switching frequency, exhibits fast transient response, and provides good tracking performance under large disturbances.

中文翻译：

---

PWM DC-DC Buck转换器的简化非线性电压模式控制

本文介绍了一种用于连续导通模式的PWM dc-dc buck转换器的新型非线性电压模式控制器。滑模控制技术用于基于平均dc-dc buck转换器动态来推导简化的等效控制律。与所报道的设计方法相反，所提出的控制方案仅需要反馈环路中的输出电压，而无需电容器电流。因此，减少了模拟实现成本，并且消除了向功率转换器添加电容器电流传感器的缺点。该控制方程式是在一个简单的模拟电路中使用很少的运算放大器和电阻器实现的，适合工业应用。给出了系统建模和控制设计程序，并推导了存在性和稳定性条件。使用MATLAB和SaberRD仿真分析了控制系统的性能。此外，在PCB上开发了简化的非线性电压模式控制dc-dc降压转换器的简单模拟原型。仿真和实验结果表明，该控制器保持恒定的开关频率，具有快速的瞬态响应，并且在大干扰下具有良好的跟踪性能。