Second-Order Sliding-Mode Controlled Synchronous Buck DC–DC Converter


In this paper, second-order sliding-mode (SOSM) control approach is applied to synchronous buck dc–dc converters. The proposed SOSM controller will stabilize synchronous buck dc–dc converters employing a easy digital state-machine structure, without requiring current sensing or an integral term in the control loop. The SOSM controller ends up in fast step-load and begin-up transient responses, and is strong against parameter uncertainties. Quick transients and current limitation throughout begin up can be accomplished by adjusting one controller parameter. Furthermore, a hysteresis method is introduced to manage the switching frequency. The proposed approach is verified by experimental results on a 1.twenty five-V 10-A prototype.

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