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Abstract
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In this paper, sliding mode control (SMC) for a bidirectional buck/boost DC-DC
converter (BDC) with constant frequency in continuous conduction mode (CCM) is
discussed. Since the converter is a high-order converter, the reduced-order sliding manifold
is exploited. Because of right-half-plan zero (RHPZ) in the converter’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 step-down 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.
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