![]() For charger design, many charging methods have been developed, such as the constant trickle current (CTC), constant current (CC), constant voltage (CV), hybrid CC/CV, and reflex charging methods. The research of this paper is only focused on PV arrays for battery charger applications. The PV arrays usually need a battery charger to increase its utility rate. As a result, it is often applied to the PV arrays for enhancing power capacity.Ī typical PV power system is shown in Figure 1. The perturbation-and-observation method requires the measurement of only a few parameters, thus it facilitates an MPPT control. Some of the popular MPPT algorithms use perturbation-and-observation method, incremental conductance method, constant voltage method, method, system oscillation method, and ripple correlation method. Several MPPT algorithms have been proposed. Thus, a power converter (dc/dc converter or dc/ac converter) and MPPT algorithm are required to regulate its output power. However, due to the instability and intermittent characteristics of PV arrays, it cannot provide a constant or stable power output. One of these sources is PV arrays energy, which is clean, quiet, and maintenance-free. Introductionĭue to the continuous growth of the global energy demand for developing industry, it increases society awareness of environmental impacts from the widespread utilization of fossil fuels, leading to the exploration of renewable energy sources, such as PV arrays, wind energy, and so on. Experimental results have verified the performance and feasibility of the proposed PV power system for battery charger applications. Finally, a prototype battery charger is built and implemented. In order to draw the maximum power from PV arrays and obtain the optimal power control of the battery charger, a perturbation-and-observation method and microchip are incorporated to implement maximum power point tracking (MPPT) algorithm and power management. ![]() Therefore, active switches of the charger can be operated with zero-voltage transition (ZVT) to decrease switching losses and increase conversion efficiency. The charger uses an interleaving boost converter with a single-capacitor turn-off snubber to reduce voltage stresses of active switches at turn-off transition. This paper proposes a photovoltaic (PV) power system for battery charger applications. ![]()
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