A New Control Strategy of the Solar Buck Battery Charger using the Interleaved Ampere-Sec Balance Control

The DC-DC buck converter can be applied to solar photovoltaic (PV) battery charging applications. However, the solar buck battery charger exhibits nonlinear behavior in the output current due to the nonlinear output of the solar PV array and the fixed voltage of the output-side battery. Therefore, this paper analyzes the nonlinearity of the output current from the perspective of Ampere-sec balance in all regions, and proposes interleaved ampere-sec balance control to enhance stability. The modeling of the solar buck battery charger and the solar interleaved buck battery charger employs unified modeling. This enables accurate comparisons, and the improvement in stability is verified through comparative simulations.