Design and implementation of low-loss non-inverting buck-boost for lithium-ion batteries charging applications

This article is going to describe the design and implementation of a non-inverting buck-boost converter for lithium-ion battery chargers. The described modulation strategy allows to achieve a high efficiency and high power density converter. The prototype is made up of off-the-shelf components and the elaborated current predictive control algorithm avoids the use of a current sensor. Only voltage sensing is needed. Both the designed strategy for the prototype and the implementation of the control algorithm on MCU are described. Experimental measurements on device prove the capabilities of the prototype.