带二重积分滑模面的PWM电压滑模控制器设计

通过将PWM(脉冲宽度调制)控制与滑模变结构控制的优点结合起来,设计了一种带二重积分滑膜面的滑模控制器来控制二阶交错并联Boost开关功率变换器.滑模面附加积分项使滑模控制系统的运动方程与原阶数相同,改善系统的稳态性能.设计仿真电路对该控制器在Boost变换器连续工作模式下进行PSIM仿真,得出该控制器与传统控制器相比具有更好的动态特性:Boost的电压和电流纹波较小;输出电压对输入电压和输出负载有较强的鲁棒性;输出电压不随开关频率的变化而变化.

On Design of PWM-Based Sliding-Mode Controller for Interleaved Boost Converters

A PWM-based sliding-mode controller has been proposed in this paper to control a two-phase in-terleaved boost converter,in which the advantages of PWM control and variable structure control are con-sidered.In order to improve steady-state performance of the system,sliding surface with two integral e-quation has been designed,which can make the control system keep the same order as the original.Artifi-cial circuit has been designed to verify the performance of the interleaved boost converter with the proposed control method in continuous mode.Desired dynamic properties including small ripple of output voltage and input current,the robustness against output resistance and input voltage,as well as the fixed-frequen-cy characteristic have been testified by the result of PSIM simulation.