Adaptive sliding mode control with simple adaptive control for buck converters <Abstract> This paper proposes a control method for buck converters using an adaptive sliding mode control (SMC) with simple adaptive control (SAC). The controller is designed to monitor the output voltage of the buck converter, and to use it and its derivations to adaptively change the control parameters to keep the output voltage error minimal corresponding to any loading variations. The role of SAC is to construct an equivalent control input of adaptive SMC. To construct a corrective control input, this paper applies the method using the sign function with a modified sliding surface. Thus the states of the buck converter are not required by the controller. Furthermore, this proposed method is applied based on pulsewidth- modulation (PWM). Computer simulations have been carried out to verify the idea. |