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Loop-Shaping Based Control for Switch Mode DC-DC Power Converters

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Document pages: 18 pages

Abstract: Renewableenergy sources require switching regulators as an interface to a load with highefficiency, small size, proper output regulation, and fast transient response.Moreover, due to the nonlinear behavior and switching nature of DC-DC powerelectronic converters, there is a need for high-performance control strategies.This work summarized the dynamic behavior for the three basic switch-mode DC-DCpower converters operating in continuous conduction mode, i.e. buck, boost, and buck-boost. A controller was designed usingloop-shaping based on current-mode control that consists of two feedback loops.A high-gain compensator with wide bandwidth was used in the inner current loopfor fast transient response. A proportional-integral controller was used in theouter voltage loop for regulation purposes. A procedure was proposed for the parameters of the controller that ensuresclosed-loop stability and output voltage regulation. The design-orientedanalysis was applied to the three basic switch-mode DC-DC power converters.Experimental results were obtained for a switching regulator with a boost converterof 150 W, which exhibits non-minimum phase behavior. The performance of thecontroller was tested for voltage regulation by applying large load changes.

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