An improved sliding mode controller for positive output Luo converter

Positive output Luo converters are a series of DC-DC converters possessing high-voltage transfer gain and small ripple voltage and ripple current. They have very large potential in future industrial applications. Sliding mode control is an effective control method for these converters due to their nonlinear property. Previous work has solved the problem of constant switching frequency. But those controllers cannot alleviate the steady-state error. In this paper, an improved sliding mode controller is proposed. With a double integral term, it can eliminate the steady-state error despite of the input disturbance and load variation. Simulation and experimental results are provided for verification of our design.