sliding mode control of a bidirectional buck/boost dc-dc converter with constant switching frequency

In this paper, sliding mode control (smc) for a bidirectional buck/boost dcdc converter (bdc) with constant frequency in continuous conduction mode (ccm) is discussed. since the converter is a highorder converter, the reducedorder sliding manifold is exploited. because of righthalfplan zero (rhpz) in the converter rsquo;s duty ratio to output voltage transfer function, sliding mode current controller is used. this controller benefits from various advantages such as fast dynamic response, robustness, stable and small variation of the settling time over a wide range of operation conditions. because the converter operates in both stepdown and step-up modes, two sliding manifold is derived for each mode. the existence and stability conditions are analyzed for both smc in stepdown and step-up modes. finally, simulation results are also provided to justify the feasibility of the controller using matlab/simulink.