Abstract
In this paper, a new controller for a boost DC-DC (direct current to direct current) power converter is proposed. The discussed DC-DC boost converter model considers the losses coming from the inductor and capacitor. The novel control scheme takes into account that the duty cycle is constrained to physically admissible values. The analysis of the closed-loop trajectories provides the conclusion that output voltage regulation is achieved in asymptotic form. In addition, the problem of uncertain supply voltage and unmeasurable inductor current is also addressed by using an observer together with the proposed control law. Our theoretical results are supported by using numerical simulations and experimental tests. Comparisons with respect to known approaches are presented.
Highlights
The voltage of many electrical and electronic systems is often higher than the voltage of the main source, for example, in systems powered by batteries
The boost power converter is applied in photovoltaic systems [5], mobile communication circuits [6], power factor correction [7], and hybrid electric vehicle systems [8]
Proposition 2 provides the theoretical framework for controller (17) and (18) to accomplish output voltage regulation under the constrained control input; that is, the duty cycle percentage remains in the physical admissible limit for all time
Summary
The voltage of many electrical and electronic systems is often higher than the voltage of the main source, for example, in systems powered by batteries. The work in [13] presented a comparison of nonlinear controllers for the DC-DC boost power converter. The duty cycle percentage is the control input for the boost power converter. Other problems with saturation in the dynamics (not in the system input) have been addressed in, for example, [20], where a nonlinear controller with an inherent current limiting capability was presented for different types of DC-DC power converters. There have been only a few works that address the problem of voltage regulation for boost converters control under constrained duty cycle percentage. In [24], a control design procedure for boost power converters was reported, and, this procedure ensures robustness for the supply voltage and output load variations, input saturation is avoided.
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