Two controls of novel buck-boost converter for solar photovoltaics

One of the most promising technologies for the non-carbon based electricity production is solar photovoltaics. Novel power electronics devices and converters together with new control concepts in the frame of “green electronics” are necessary. For a novel buck-boost converter two controls that make it possible to control the mean value of the output voltage, this is e.g. the voltage across a DC machine (and therefore the speed), in a wide range from zero up to some times of the input voltage are designed. The traditional modulation approach and the sliding-mode control of this switching converter are presented. The conditions for the existence of the limit cycles used for modulation control design and those of the sliding mode based on the method of the equivalent control are presented. Some experimental results validating the design approaches are given and discussed.