Sliding Mode Voltage Control of the DC to DC Buck Converters

In comparison with the conventional power converters, the switching power converters, which possess the advantages of higher efficiency, smaller size, lighter weight, and wider ranges of voltage regulation, are widely applied in the application of portable electronic products and equipment in recent years. This article mainly focuses on the development and implementation of a buck converter with a sliding mode voltage controller, to achieve the stable desired voltage output. Firstly, based on Lyapunov stable analysis, the controller is proposed to enforce the system trajectory from the arbitrary point toward the sliding surface in finite time, and then slides along the surface to an equilibrium point exponentially. According to a fixed frequency pulse width modulation mechanism, the proposed controller is realized by controlling the duty cycle of the switching regulator to achieve the desired stable voltage output under the influences of loading variations. From the simulation results obtained by the PSpice simulation software, the encouraged system performance was validated by the testing of different loadings.

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